Merge branch 'master' into careminster-presence-refactor

1 files changed, 2201 insertions, 2201 deletions

diff --git a/OpenSim/Region/Physics/Meshing/PrimMesher.cs b/OpenSim/Region/Physics/Meshing/PrimMesher.cs
index 6e9654b..932943c 100644
--- a/OpenSim/Region/Physics/Meshing/PrimMesher.cs
+++ b/OpenSim/Region/Physics/Meshing/PrimMesher.cs
@@ -1,2201 +1,2201 @@
-/*

- * Copyright (c) Contributors

- * See CONTRIBUTORS.TXT for a full list of copyright holders.

- *

- * Redistribution and use in source and binary forms, with or without

- * modification, are permitted provided that the following conditions are met:

- *     * Redistributions of source code must retain the above copyright

- *       notice, this list of conditions and the following disclaimer.

- *     * Redistributions in binary form must reproduce the above copyright

- *       notice, this list of conditions and the following disclaimer in the

- *       documentation and/or other materials provided with the distribution.

- *     * Neither the name of the OpenSimulator Project nor the

- *       names of its contributors may be used to endorse or promote products

- *       derived from this software without specific prior written permission.

- *

- * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY

- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

- * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY

- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

- */

-

-using System;

-using System.Collections.Generic;

-using System.Text;

-using System.IO;

-

-namespace PrimMesher

-{

-    public struct Quat

-    {

-        /// <summary>X value</summary>

-        public float X;

-        /// <summary>Y value</summary>

-        public float Y;

-        /// <summary>Z value</summary>

-        public float Z;

-        /// <summary>W value</summary>

-        public float W;

-

-        public Quat(float x, float y, float z, float w)

-        {

-            X = x;

-            Y = y;

-            Z = z;

-            W = w;

-        }

-

-        public Quat(Coord axis, float angle)

-        {

-            axis = axis.Normalize();

-

-            angle *= 0.5f;

-            float c = (float)Math.Cos(angle);

-            float s = (float)Math.Sin(angle);

-

-            X = axis.X * s;

-            Y = axis.Y * s;

-            Z = axis.Z * s;

-            W = c;

-

-            Normalize();

-        }

-

-        public float Length()

-        {

-            return (float)Math.Sqrt(X * X + Y * Y + Z * Z + W * W);

-        }

-

-        public Quat Normalize()

-        {

-            const float MAG_THRESHOLD = 0.0000001f;

-            float mag = Length();

-

-            // Catch very small rounding errors when normalizing

-            if (mag > MAG_THRESHOLD)

-            {

-                float oomag = 1f / mag;

-                X *= oomag;

-                Y *= oomag;

-                Z *= oomag;

-                W *= oomag;

-            }

-            else

-            {

-                X = 0f;

-                Y = 0f;

-                Z = 0f;

-                W = 1f;

-            }

-

-            return this;

-        }

-

-        public static Quat operator *(Quat q1, Quat q2)

-        {

-            float x = q1.W * q2.X + q1.X * q2.W + q1.Y * q2.Z - q1.Z * q2.Y;

-            float y = q1.W * q2.Y - q1.X * q2.Z + q1.Y * q2.W + q1.Z * q2.X;

-            float z = q1.W * q2.Z + q1.X * q2.Y - q1.Y * q2.X + q1.Z * q2.W;

-            float w = q1.W * q2.W - q1.X * q2.X - q1.Y * q2.Y - q1.Z * q2.Z;

-            return new Quat(x, y, z, w);

-        }

-

-        public override string ToString()

-        {

-            return "< X: " + this.X.ToString() + ", Y: " + this.Y.ToString() + ", Z: " + this.Z.ToString() + ", W: " + this.W.ToString() + ">";

-        }

-    }

-

-    public struct Coord

-    {

-        public float X;

-        public float Y;

-        public float Z;

-

-        public Coord(float x, float y, float z)

-        {

-            this.X = x;

-            this.Y = y;

-            this.Z = z;

-        }

-

-        public float Length()

-        {

-            return (float)Math.Sqrt(this.X * this.X + this.Y * this.Y + this.Z * this.Z);

-        }

-

-        public Coord Invert()

-        {

-            this.X = -this.X;

-            this.Y = -this.Y;

-            this.Z = -this.Z;

-

-            return this;

-        }

-

-        public Coord Normalize()

-        {

-            const float MAG_THRESHOLD = 0.0000001f;

-            float mag = Length();

-

-            // Catch very small rounding errors when normalizing

-            if (mag > MAG_THRESHOLD)

-            {

-                float oomag = 1.0f / mag;

-                this.X *= oomag;

-                this.Y *= oomag;

-                this.Z *= oomag;

-            }

-            else

-            {

-                this.X = 0.0f;

-                this.Y = 0.0f;

-                this.Z = 0.0f;

-            }

-

-            return this;

-        }

-

-        public override string ToString()

-        {

-            return this.X.ToString() + " " + this.Y.ToString() + " " + this.Z.ToString();

-        }

-

-        public static Coord Cross(Coord c1, Coord c2)

-        {

-            return new Coord(

-                c1.Y * c2.Z - c2.Y * c1.Z,

-                c1.Z * c2.X - c2.Z * c1.X,

-                c1.X * c2.Y - c2.X * c1.Y

-                );

-        }

-

-        public static Coord operator +(Coord v, Coord a)

-        {

-            return new Coord(v.X + a.X, v.Y + a.Y, v.Z + a.Z);

-        }

-

-        public static Coord operator *(Coord v, Coord m)

-        {

-            return new Coord(v.X * m.X, v.Y * m.Y, v.Z * m.Z);

-        }

-

-        public static Coord operator *(Coord v, Quat q)

-        {

-            // From http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/transforms/

-

-            Coord c2 = new Coord(0.0f, 0.0f, 0.0f);

-

-            c2.X = q.W * q.W * v.X +

-                2f * q.Y * q.W * v.Z -

-                2f * q.Z * q.W * v.Y +

-                     q.X * q.X * v.X +

-                2f * q.Y * q.X * v.Y +

-                2f * q.Z * q.X * v.Z -

-                     q.Z * q.Z * v.X -

-                     q.Y * q.Y * v.X;

-

-            c2.Y =

-                2f * q.X * q.Y * v.X +

-                     q.Y * q.Y * v.Y +

-                2f * q.Z * q.Y * v.Z +

-                2f * q.W * q.Z * v.X -

-                     q.Z * q.Z * v.Y +

-                     q.W * q.W * v.Y -

-                2f * q.X * q.W * v.Z -

-                     q.X * q.X * v.Y;

-

-            c2.Z =

-                2f * q.X * q.Z * v.X +

-                2f * q.Y * q.Z * v.Y +

-                     q.Z * q.Z * v.Z -

-                2f * q.W * q.Y * v.X -

-                     q.Y * q.Y * v.Z +

-                2f * q.W * q.X * v.Y -

-                     q.X * q.X * v.Z +

-                     q.W * q.W * v.Z;

-

-            return c2;

-        }

-    }

-

-    public struct UVCoord

-    {

-        public float U;

-        public float V;

-

-

-        public UVCoord(float u, float v)

-        {

-            this.U = u;

-            this.V = v;

-        }

-    }

-

-    public struct Face

-    {

-        public int primFace;

-

-        // vertices

-        public int v1;

-        public int v2;

-        public int v3;

-

-        //normals

-        public int n1;

-        public int n2;

-        public int n3;

-

-        // uvs

-        public int uv1;

-        public int uv2;

-        public int uv3;

-

-

-        public Face(int v1, int v2, int v3)

-        {

-            primFace = 0;

-

-            this.v1 = v1;

-            this.v2 = v2;

-            this.v3 = v3;

-

-            this.n1 = 0;

-            this.n2 = 0;

-            this.n3 = 0;

-

-            this.uv1 = 0;

-            this.uv2 = 0;

-            this.uv3 = 0;

-

-        }

-

-        public Face(int v1, int v2, int v3, int n1, int n2, int n3)

-        {

-            primFace = 0;

-

-            this.v1 = v1;

-            this.v2 = v2;

-            this.v3 = v3;

-

-            this.n1 = n1;

-            this.n2 = n2;

-            this.n3 = n3;

-

-            this.uv1 = 0;

-            this.uv2 = 0;

-            this.uv3 = 0;

-        }

-

-        public Coord SurfaceNormal(List<Coord> coordList)

-        {

-            Coord c1 = coordList[this.v1];

-            Coord c2 = coordList[this.v2];

-            Coord c3 = coordList[this.v3];

-

-            Coord edge1 = new Coord(c2.X - c1.X, c2.Y - c1.Y, c2.Z - c1.Z);

-            Coord edge2 = new Coord(c3.X - c1.X, c3.Y - c1.Y, c3.Z - c1.Z);

-

-            return Coord.Cross(edge1, edge2).Normalize();

-        }

-    }

-

-    public struct ViewerFace

-    {

-        public int primFaceNumber;

-

-        public Coord v1;

-        public Coord v2;

-        public Coord v3;

-

-        public int coordIndex1;

-        public int coordIndex2;

-        public int coordIndex3;

-

-        public Coord n1;

-        public Coord n2;

-        public Coord n3;

-

-        public UVCoord uv1;

-        public UVCoord uv2;

-        public UVCoord uv3;

-

-        public ViewerFace(int primFaceNumber)

-        {

-            this.primFaceNumber = primFaceNumber;

-

-            this.v1 = new Coord();

-            this.v2 = new Coord();

-            this.v3 = new Coord();

-

-            this.coordIndex1 = this.coordIndex2 = this.coordIndex3 = -1; // -1 means not assigned yet

-

-            this.n1 = new Coord();

-            this.n2 = new Coord();

-            this.n3 = new Coord();

-

-            this.uv1 = new UVCoord();

-            this.uv2 = new UVCoord();

-            this.uv3 = new UVCoord();

-        }

-

-        public void Scale(float x, float y, float z)

-        {

-            this.v1.X *= x;

-            this.v1.Y *= y;

-            this.v1.Z *= z;

-

-            this.v2.X *= x;

-            this.v2.Y *= y;

-            this.v2.Z *= z;

-

-            this.v3.X *= x;

-            this.v3.Y *= y;

-            this.v3.Z *= z;

-        }

-

-        public void AddPos(float x, float y, float z)

-        {

-            this.v1.X += x;

-            this.v2.X += x;

-            this.v3.X += x;

-

-            this.v1.Y += y;

-            this.v2.Y += y;

-            this.v3.Y += y;

-

-            this.v1.Z += z;

-            this.v2.Z += z;

-            this.v3.Z += z;

-        }

-

-        public void AddRot(Quat q)

-        {

-            this.v1 *= q;

-            this.v2 *= q;

-            this.v3 *= q;

-

-            this.n1 *= q;

-            this.n2 *= q;

-            this.n3 *= q;

-        }

-

-        public void CalcSurfaceNormal()

-        {

-

-            Coord edge1 = new Coord(this.v2.X - this.v1.X, this.v2.Y - this.v1.Y, this.v2.Z - this.v1.Z);

-            Coord edge2 = new Coord(this.v3.X - this.v1.X, this.v3.Y - this.v1.Y, this.v3.Z - this.v1.Z);

-

-            this.n1 = this.n2 = this.n3 = Coord.Cross(edge1, edge2).Normalize();

-        }

-    }

-

-    internal struct Angle

-    {

-        internal float angle;

-        internal float X;

-        internal float Y;

-

-        internal Angle(float angle, float x, float y)

-        {

-            this.angle = angle;

-            this.X = x;

-            this.Y = y;

-        }

-    }

-

-    internal class AngleList

-    {

-        private float iX, iY; // intersection point

-

-        private static Angle[] angles3 =

-        {

-            new Angle(0.0f, 1.0f, 0.0f),

-            new Angle(0.33333333333333333f, -0.5f, 0.86602540378443871f),

-            new Angle(0.66666666666666667f, -0.5f, -0.86602540378443837f),

-            new Angle(1.0f, 1.0f, 0.0f)

-        };

-

-        private static Coord[] normals3 =

-        {

-            new Coord(0.25f, 0.4330127019f, 0.0f).Normalize(),

-            new Coord(-0.5f, 0.0f, 0.0f).Normalize(),

-            new Coord(0.25f, -0.4330127019f, 0.0f).Normalize(),

-            new Coord(0.25f, 0.4330127019f, 0.0f).Normalize()

-        };

-

-        private static Angle[] angles4 =

-        {

-            new Angle(0.0f, 1.0f, 0.0f),

-            new Angle(0.25f, 0.0f, 1.0f),

-            new Angle(0.5f, -1.0f, 0.0f),

-            new Angle(0.75f, 0.0f, -1.0f),

-            new Angle(1.0f, 1.0f, 0.0f)

-        };

-

-        private static Coord[] normals4 = 

-        {

-            new Coord(0.5f, 0.5f, 0.0f).Normalize(),

-            new Coord(-0.5f, 0.5f, 0.0f).Normalize(),

-            new Coord(-0.5f, -0.5f, 0.0f).Normalize(),

-            new Coord(0.5f, -0.5f, 0.0f).Normalize(),

-            new Coord(0.5f, 0.5f, 0.0f).Normalize()

-        };

-

-        private static Angle[] angles24 =

-        {

-            new Angle(0.0f, 1.0f, 0.0f),

-            new Angle(0.041666666666666664f, 0.96592582628906831f, 0.25881904510252074f),

-            new Angle(0.083333333333333329f, 0.86602540378443871f, 0.5f),

-            new Angle(0.125f, 0.70710678118654757f, 0.70710678118654746f),

-            new Angle(0.16666666666666667f, 0.5f, 0.8660254037844386f),

-            new Angle(0.20833333333333331f, 0.25881904510252096f, 0.9659258262890682f),

-            new Angle(0.25f, 0.0f, 1.0f),

-            new Angle(0.29166666666666663f, -0.25881904510252063f, 0.96592582628906831f),

-            new Angle(0.33333333333333333f, -0.5f, 0.86602540378443871f),

-            new Angle(0.375f, -0.70710678118654746f, 0.70710678118654757f),

-            new Angle(0.41666666666666663f, -0.86602540378443849f, 0.5f),

-            new Angle(0.45833333333333331f, -0.9659258262890682f, 0.25881904510252102f),

-            new Angle(0.5f, -1.0f, 0.0f),

-            new Angle(0.54166666666666663f, -0.96592582628906842f, -0.25881904510252035f),

-            new Angle(0.58333333333333326f, -0.86602540378443882f, -0.5f),

-            new Angle(0.62499999999999989f, -0.70710678118654791f, -0.70710678118654713f),

-            new Angle(0.66666666666666667f, -0.5f, -0.86602540378443837f),

-            new Angle(0.70833333333333326f, -0.25881904510252152f, -0.96592582628906809f),

-            new Angle(0.75f, 0.0f, -1.0f),

-            new Angle(0.79166666666666663f, 0.2588190451025203f, -0.96592582628906842f),

-            new Angle(0.83333333333333326f, 0.5f, -0.86602540378443904f),

-            new Angle(0.875f, 0.70710678118654735f, -0.70710678118654768f),

-            new Angle(0.91666666666666663f, 0.86602540378443837f, -0.5f),

-            new Angle(0.95833333333333326f, 0.96592582628906809f, -0.25881904510252157f),

-            new Angle(1.0f, 1.0f, 0.0f)

-        };

-

-        private Angle interpolatePoints(float newPoint, Angle p1, Angle p2)

-        {

-            float m = (newPoint - p1.angle) / (p2.angle - p1.angle);

-            return new Angle(newPoint, p1.X + m * (p2.X - p1.X), p1.Y + m * (p2.Y - p1.Y));

-        }

-

-        private void intersection(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)

-        { // ref: http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline2d/

-            double denom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1);

-            double uaNumerator = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3);

-

-            if (denom != 0.0)

-            {

-                double ua = uaNumerator / denom;

-                iX = (float)(x1 + ua * (x2 - x1));

-                iY = (float)(y1 + ua * (y2 - y1));

-            }

-        }

-

-        internal List<Angle> angles;

-        internal List<Coord> normals;

-

-        internal void makeAngles(int sides, float startAngle, float stopAngle)

-        {

-            angles = new List<Angle>();

-            normals = new List<Coord>();

-

-            double twoPi = System.Math.PI * 2.0;

-            float twoPiInv = 1.0f / (float)twoPi;

-

-            if (sides < 1)

-                throw new Exception("number of sides not greater than zero");

-            if (stopAngle <= startAngle)

-                throw new Exception("stopAngle not greater than startAngle");

-

-            if ((sides == 3 || sides == 4 || sides == 24))

-            {

-                startAngle *= twoPiInv;

-                stopAngle *= twoPiInv;

-

-                Angle[] sourceAngles;

-                if (sides == 3)

-                    sourceAngles = angles3;

-                else if (sides == 4)

-                    sourceAngles = angles4;

-                else sourceAngles = angles24;

-

-                int startAngleIndex = (int)(startAngle * sides);

-                int endAngleIndex = sourceAngles.Length - 1;

-                if (stopAngle < 1.0f)

-                    endAngleIndex = (int)(stopAngle * sides) + 1;

-                if (endAngleIndex == startAngleIndex)

-                    endAngleIndex++;

-

-                for (int angleIndex = startAngleIndex; angleIndex < endAngleIndex + 1; angleIndex++)

-                {

-                    angles.Add(sourceAngles[angleIndex]);

-                    if (sides == 3)

-                        normals.Add(normals3[angleIndex]);

-                    else if (sides == 4)

-                        normals.Add(normals4[angleIndex]);

-                }

-

-                if (startAngle > 0.0f)

-                    angles[0] = interpolatePoints(startAngle, angles[0], angles[1]);

-

-                if (stopAngle < 1.0f)

-                {

-                    int lastAngleIndex = angles.Count - 1;

-                    angles[lastAngleIndex] = interpolatePoints(stopAngle, angles[lastAngleIndex - 1], angles[lastAngleIndex]);

-                }

-            }

-            else

-            {

-                double stepSize = twoPi / sides;

-

-                int startStep = (int)(startAngle / stepSize);

-                double angle = stepSize * startStep;

-                int step = startStep;

-                double stopAngleTest = stopAngle;

-                if (stopAngle < twoPi)

-                {

-                    stopAngleTest = stepSize * ((int)(stopAngle / stepSize) + 1);

-                    if (stopAngleTest < stopAngle)

-                        stopAngleTest += stepSize;

-                    if (stopAngleTest > twoPi)

-                        stopAngleTest = twoPi;

-                }

-

-                while (angle <= stopAngleTest)

-                {

-                    Angle newAngle;

-                    newAngle.angle = (float)angle;

-                    newAngle.X = (float)System.Math.Cos(angle);

-                    newAngle.Y = (float)System.Math.Sin(angle);

-                    angles.Add(newAngle);

-                    step += 1;

-                    angle = stepSize * step;

-                }

-

-                if (startAngle > angles[0].angle)

-                {

-                    Angle newAngle;

-                    intersection(angles[0].X, angles[0].Y, angles[1].X, angles[1].Y, 0.0f, 0.0f, (float)Math.Cos(startAngle), (float)Math.Sin(startAngle));

-                    newAngle.angle = startAngle;

-                    newAngle.X = iX;

-                    newAngle.Y = iY;

-                    angles[0] = newAngle;

-                }

-

-                int index = angles.Count - 1;

-                if (stopAngle < angles[index].angle)

-                {

-                    Angle newAngle;

-                    intersection(angles[index - 1].X, angles[index - 1].Y, angles[index].X, angles[index].Y, 0.0f, 0.0f, (float)Math.Cos(stopAngle), (float)Math.Sin(stopAngle));

-                    newAngle.angle = stopAngle;

-                    newAngle.X = iX;

-                    newAngle.Y = iY;

-                    angles[index] = newAngle;

-                }

-            }

-        }

-    }

-

-    /// <summary>

-    /// generates a profile for extrusion

-    /// </summary>

-    internal class Profile

-    {

-        private const float twoPi = 2.0f * (float)Math.PI;

-

-        internal string errorMessage = null;

-

-        internal List<Coord> coords;

-        internal List<Face> faces;

-        internal List<Coord> vertexNormals;

-        internal List<float> us;

-        internal List<UVCoord> faceUVs;

-        internal List<int> faceNumbers;

-

-        // use these for making individual meshes for each prim face

-        internal List<int> outerCoordIndices = null;

-        internal List<int> hollowCoordIndices = null;

-        internal List<int> cut1CoordIndices = null;

-        internal List<int> cut2CoordIndices = null;

-

-        internal Coord faceNormal = new Coord(0.0f, 0.0f, 1.0f);

-        internal Coord cutNormal1 = new Coord();

-        internal Coord cutNormal2 = new Coord();

-

-        internal int numOuterVerts = 0;

-        internal int numHollowVerts = 0;

-

-        internal bool calcVertexNormals = false;

-        internal int bottomFaceNumber = 0;

-        internal int numPrimFaces = 0;

-

-        internal Profile()

-        {

-            this.coords = new List<Coord>();

-            this.faces = new List<Face>();

-            this.vertexNormals = new List<Coord>();

-            this.us = new List<float>();

-            this.faceUVs = new List<UVCoord>();

-            this.faceNumbers = new List<int>();

-        }

-

-        internal Profile(int sides, float profileStart, float profileEnd, float hollow, int hollowSides, bool createFaces, bool calcVertexNormals)

-        {

-            this.calcVertexNormals = calcVertexNormals;

-            this.coords = new List<Coord>();

-            this.faces = new List<Face>();

-            this.vertexNormals = new List<Coord>();

-            this.us = new List<float>();

-            this.faceUVs = new List<UVCoord>();

-            this.faceNumbers = new List<int>();

-

-            Coord center = new Coord(0.0f, 0.0f, 0.0f);

-            //bool hasCenter = false;

-

-            List<Coord> hollowCoords = new List<Coord>();

-            List<Coord> hollowNormals = new List<Coord>();

-            List<float> hollowUs = new List<float>();

-

-            if (calcVertexNormals)

-            {

-                this.outerCoordIndices = new List<int>();

-                this.hollowCoordIndices = new List<int>();

-                this.cut1CoordIndices = new List<int>();

-                this.cut2CoordIndices = new List<int>();

-            }

-

-            bool hasHollow = (hollow > 0.0f);

-

-            bool hasProfileCut = (profileStart > 0.0f || profileEnd < 1.0f);

-

-            AngleList angles = new AngleList();

-            AngleList hollowAngles = new AngleList();

-

-            float xScale = 0.5f;

-            float yScale = 0.5f;

-            if (sides == 4)  // corners of a square are sqrt(2) from center

-            {

-                xScale = 0.707f;

-                yScale = 0.707f;

-            }

-

-            float startAngle = profileStart * twoPi;

-            float stopAngle = profileEnd * twoPi;

-

-            try { angles.makeAngles(sides, startAngle, stopAngle); }

-            catch (Exception ex)

-            {

-

-                errorMessage = "makeAngles failed: Exception: " + ex.ToString()

-                + "\nsides: " + sides.ToString() + " startAngle: " + startAngle.ToString() + " stopAngle: " + stopAngle.ToString();

-

-                return;

-            }

-

-            this.numOuterVerts = angles.angles.Count;

-

-            // flag to create as few triangles as possible for 3 or 4 side profile

-            bool simpleFace = (sides < 5 && !hasHollow && !hasProfileCut);

-

-            if (hasHollow)

-            {

-                if (sides == hollowSides)

-                    hollowAngles = angles;

-                else

-                {

-                    try { hollowAngles.makeAngles(hollowSides, startAngle, stopAngle); }

-                    catch (Exception ex)

-                    {

-                        errorMessage = "makeAngles failed: Exception: " + ex.ToString()

-                        + "\nsides: " + sides.ToString() + " startAngle: " + startAngle.ToString() + " stopAngle: " + stopAngle.ToString();

-

-                        return;

-                    }

-                }

-                this.numHollowVerts = hollowAngles.angles.Count;

-            }

-            else if (!simpleFace)

-            {

-                this.coords.Add(center);

-                //hasCenter = true;

-                if (this.calcVertexNormals)

-                    this.vertexNormals.Add(new Coord(0.0f, 0.0f, 1.0f));

-                this.us.Add(0.0f);

-            }

-

-            float z = 0.0f;

-

-            Angle angle;

-            Coord newVert = new Coord();

-            if (hasHollow && hollowSides != sides)

-            {

-                int numHollowAngles = hollowAngles.angles.Count;

-                for (int i = 0; i < numHollowAngles; i++)

-                {

-                    angle = hollowAngles.angles[i];

-                    newVert.X = hollow * xScale * angle.X;

-                    newVert.Y = hollow * yScale * angle.Y;

-                    newVert.Z = z;

-

-                    hollowCoords.Add(newVert);

-                    if (this.calcVertexNormals)

-                    {

-                        if (hollowSides < 5)

-                            hollowNormals.Add(hollowAngles.normals[i].Invert());

-                        else

-                            hollowNormals.Add(new Coord(-angle.X, -angle.Y, 0.0f));

-

-                        hollowUs.Add(angle.angle * hollow);

-                    }

-                }

-            }

-

-            int index = 0;

-            int numAngles = angles.angles.Count;

-

-            for (int i = 0; i < numAngles; i++)

-            {

-                angle = angles.angles[i];

-                newVert.X = angle.X * xScale;

-                newVert.Y = angle.Y * yScale;

-                newVert.Z = z;

-                this.coords.Add(newVert);

-                if (this.calcVertexNormals)

-                {

-                    this.outerCoordIndices.Add(this.coords.Count - 1);

-

-                    if (sides < 5)

-                    {

-                        this.vertexNormals.Add(angles.normals[i]);

-                        float u = angle.angle;

-                        this.us.Add(u);

-                    }

-                    else

-                    {

-                        this.vertexNormals.Add(new Coord(angle.X, angle.Y, 0.0f));

-                        this.us.Add(angle.angle);

-                    }

-                }

-

-                if (hasHollow)

-                {

-                    if (hollowSides == sides)

-                    {

-                        newVert.X *= hollow;

-                        newVert.Y *= hollow;

-                        newVert.Z = z;

-                        hollowCoords.Add(newVert);

-                        if (this.calcVertexNormals)

-                        {

-                            if (sides < 5)

-                            {

-                                hollowNormals.Add(angles.normals[i].Invert());

-                            }

-

-                            else

-                                hollowNormals.Add(new Coord(-angle.X, -angle.Y, 0.0f));

-

-                            hollowUs.Add(angle.angle * hollow);

-                        }

-                    }

-                }

-                else if (!simpleFace && createFaces && angle.angle > 0.0001f)

-                {

-                    Face newFace = new Face();

-                    newFace.v1 = 0;

-                    newFace.v2 = index;

-                    newFace.v3 = index + 1;

-

-                    this.faces.Add(newFace);

-                }

-                index += 1;

-            }

-

-            if (hasHollow)

-            {

-                hollowCoords.Reverse();

-                if (this.calcVertexNormals)

-                {

-                    hollowNormals.Reverse();

-                    hollowUs.Reverse();

-                }

-

-                if (createFaces)

-                {

-                    //int numOuterVerts = this.coords.Count;

-                    //numOuterVerts = this.coords.Count;

-                    //int numHollowVerts = hollowCoords.Count;

-                    int numTotalVerts = this.numOuterVerts + this.numHollowVerts;

-

-                    if (this.numOuterVerts == this.numHollowVerts)

-                    {

-                        Face newFace = new Face();

-

-                        for (int coordIndex = 0; coordIndex < this.numOuterVerts - 1; coordIndex++)

-                        {

-                            newFace.v1 = coordIndex;

-                            newFace.v2 = coordIndex + 1;

-                            newFace.v3 = numTotalVerts - coordIndex - 1;

-                            this.faces.Add(newFace);

-

-                            newFace.v1 = coordIndex + 1;

-                            newFace.v2 = numTotalVerts - coordIndex - 2;

-                            newFace.v3 = numTotalVerts - coordIndex - 1;

-                            this.faces.Add(newFace);

-                        }

-                    }

-                    else

-                    {

-                        if (this.numOuterVerts < this.numHollowVerts)

-                        {

-                            Face newFace = new Face();

-                            int j = 0; // j is the index for outer vertices

-                            int maxJ = this.numOuterVerts - 1;

-                            for (int i = 0; i < this.numHollowVerts; i++) // i is the index for inner vertices

-                            {

-                                if (j < maxJ)

-                                    if (angles.angles[j + 1].angle - hollowAngles.angles[i].angle < hollowAngles.angles[i].angle - angles.angles[j].angle + 0.000001f)

-                                    {

-                                        newFace.v1 = numTotalVerts - i - 1;

-                                        newFace.v2 = j;

-                                        newFace.v3 = j + 1;

-

-                                        this.faces.Add(newFace);

-                                        j += 1;

-                                    }

-

-                                newFace.v1 = j;

-                                newFace.v2 = numTotalVerts - i - 2;

-                                newFace.v3 = numTotalVerts - i - 1;

-

-                                this.faces.Add(newFace);

-                            }

-                        }

-                        else // numHollowVerts < numOuterVerts

-                        {

-                            Face newFace = new Face();

-                            int j = 0; // j is the index for inner vertices

-                            int maxJ = this.numHollowVerts - 1;

-                            for (int i = 0; i < this.numOuterVerts; i++)

-                            {

-                                if (j < maxJ)

-                                    if (hollowAngles.angles[j + 1].angle - angles.angles[i].angle < angles.angles[i].angle - hollowAngles.angles[j].angle + 0.000001f)

-                                    {

-                                        newFace.v1 = i;

-                                        newFace.v2 = numTotalVerts - j - 2;

-                                        newFace.v3 = numTotalVerts - j - 1;

-

-                                        this.faces.Add(newFace);

-                                        j += 1;

-                                    }

-

-                                newFace.v1 = numTotalVerts - j - 1;

-                                newFace.v2 = i;

-                                newFace.v3 = i + 1;

-

-                                this.faces.Add(newFace);

-                            }

-                        }

-                    }

-                }

-

-                if (calcVertexNormals)

-                {

-                    foreach (Coord hc in hollowCoords)

-                    {

-                        this.coords.Add(hc);

-                        hollowCoordIndices.Add(this.coords.Count - 1);

-                    }

-                }

-                else

-                    this.coords.AddRange(hollowCoords);

-

-                if (this.calcVertexNormals)

-                {

-                    this.vertexNormals.AddRange(hollowNormals);

-                    this.us.AddRange(hollowUs);

-

-                }

-            }

-

-            if (simpleFace && createFaces)

-            {

-                if (sides == 3)

-                    this.faces.Add(new Face(0, 1, 2));

-                else if (sides == 4)

-                {

-                    this.faces.Add(new Face(0, 1, 2));

-                    this.faces.Add(new Face(0, 2, 3));

-                }

-            }

-

-            if (calcVertexNormals && hasProfileCut)

-            {

-                if (hasHollow)

-                {

-                    int lastOuterVertIndex = this.numOuterVerts - 1;

-

-                    this.cut1CoordIndices.Add(0);

-                    this.cut1CoordIndices.Add(this.coords.Count - 1);

-

-                    this.cut2CoordIndices.Add(lastOuterVertIndex + 1);

-                    this.cut2CoordIndices.Add(lastOuterVertIndex);

-

-                    this.cutNormal1.X = this.coords[0].Y - this.coords[this.coords.Count - 1].Y;

-                    this.cutNormal1.Y = -(this.coords[0].X - this.coords[this.coords.Count - 1].X);

-

-                    this.cutNormal2.X = this.coords[lastOuterVertIndex + 1].Y - this.coords[lastOuterVertIndex].Y;

-                    this.cutNormal2.Y = -(this.coords[lastOuterVertIndex + 1].X - this.coords[lastOuterVertIndex].X);

-                }

-

-                else

-                {

-                    this.cutNormal1.X = this.vertexNormals[1].Y;

-                    this.cutNormal1.Y = -this.vertexNormals[1].X;

-

-                    this.cutNormal2.X = -this.vertexNormals[this.vertexNormals.Count - 2].Y;

-                    this.cutNormal2.Y = this.vertexNormals[this.vertexNormals.Count - 2].X;

-

-                }

-                this.cutNormal1.Normalize();

-                this.cutNormal2.Normalize();

-            }

-

-            this.MakeFaceUVs();

-

-            hollowCoords = null;

-            hollowNormals = null;

-            hollowUs = null;

-

-            if (calcVertexNormals)

-            { // calculate prim face numbers

-

-                // face number order is top, outer, hollow, bottom, start cut, end cut

-                // I know it's ugly but so is the whole concept of prim face numbers

-

-                int faceNum = 1; // start with outer faces

-                int startVert = hasProfileCut && !hasHollow ? 1 : 0;

-                if (startVert > 0)

-                    this.faceNumbers.Add(-1);

-                for (int i = 0; i < this.numOuterVerts - 1; i++)

-                    this.faceNumbers.Add(sides < 5 ? faceNum++ : faceNum);

-

-                //if (!hasHollow && !hasProfileCut)

-                //    this.bottomFaceNumber = faceNum++;

-

-                this.faceNumbers.Add(hasProfileCut ? -1 : faceNum++);

-

-                if (sides > 4 && (hasHollow || hasProfileCut))

-                    faceNum++;

-

-                if (hasHollow)

-                {

-                    for (int i = 0; i < this.numHollowVerts; i++)

-                        this.faceNumbers.Add(faceNum);

-

-                    faceNum++;

-                }

-                //if (hasProfileCut || hasHollow)

-                //    this.bottomFaceNumber = faceNum++;

-                this.bottomFaceNumber = faceNum++;

-

-                if (hasHollow && hasProfileCut)

-                    this.faceNumbers.Add(faceNum++);

-                for (int i = 0; i < this.faceNumbers.Count; i++)

-                    if (this.faceNumbers[i] == -1)

-                        this.faceNumbers[i] = faceNum++;

-

-

-                this.numPrimFaces = faceNum;

-            }

-

-        }

-

-        internal void MakeFaceUVs()

-        {

-            this.faceUVs = new List<UVCoord>();

-            foreach (Coord c in this.coords)

-                this.faceUVs.Add(new UVCoord(0.5f + c.X, 0.5f - c.Y));

-        }

-

-        internal Profile Copy()

-        {

-            return this.Copy(true);

-        }

-

-        internal Profile Copy(bool needFaces)

-        {

-            Profile copy = new Profile();

-

-            copy.coords.AddRange(this.coords);

-            copy.faceUVs.AddRange(this.faceUVs);

-

-            if (needFaces)

-                copy.faces.AddRange(this.faces);

-            if ((copy.calcVertexNormals = this.calcVertexNormals) == true)

-            {

-                copy.vertexNormals.AddRange(this.vertexNormals);

-                copy.faceNormal = this.faceNormal;

-                copy.cutNormal1 = this.cutNormal1;

-                copy.cutNormal2 = this.cutNormal2;

-                copy.us.AddRange(this.us);

-                copy.faceNumbers.AddRange(this.faceNumbers);

-

-                copy.cut1CoordIndices = new List<int>(this.cut1CoordIndices);

-                copy.cut2CoordIndices = new List<int>(this.cut2CoordIndices);

-                copy.hollowCoordIndices = new List<int>(this.hollowCoordIndices);

-                copy.outerCoordIndices = new List<int>(this.outerCoordIndices);

-            }

-            copy.numOuterVerts = this.numOuterVerts;

-            copy.numHollowVerts = this.numHollowVerts;

-

-            return copy;

-        }

-

-        internal void AddPos(Coord v)

-        {

-            this.AddPos(v.X, v.Y, v.Z);

-        }

-

-        internal void AddPos(float x, float y, float z)

-        {

-            int i;

-            int numVerts = this.coords.Count;

-            Coord vert;

-

-            for (i = 0; i < numVerts; i++)

-            {

-                vert = this.coords[i];

-                vert.X += x;

-                vert.Y += y;

-                vert.Z += z;

-                this.coords[i] = vert;

-            }

-        }

-

-        internal void AddRot(Quat q)

-        {

-            int i;

-            int numVerts = this.coords.Count;

-

-            for (i = 0; i < numVerts; i++)

-                this.coords[i] *= q;

-

-            if (this.calcVertexNormals)

-            {

-                int numNormals = this.vertexNormals.Count;

-                for (i = 0; i < numNormals; i++)

-                    this.vertexNormals[i] *= q;

-

-                this.faceNormal *= q;

-                this.cutNormal1 *= q;

-                this.cutNormal2 *= q;

-

-            }

-        }

-

-        internal void Scale(float x, float y)

-        {

-            int i;

-            int numVerts = this.coords.Count;

-            Coord vert;

-

-            for (i = 0; i < numVerts; i++)

-            {

-                vert = this.coords[i];

-                vert.X *= x;

-                vert.Y *= y;

-                this.coords[i] = vert;

-            }

-        }

-

-        /// <summary>

-        /// Changes order of the vertex indices and negates the center vertex normal. Does not alter vertex normals of radial vertices

-        /// </summary>

-        internal void FlipNormals()

-        {

-            int i;

-            int numFaces = this.faces.Count;

-            Face tmpFace;

-            int tmp;

-

-            for (i = 0; i < numFaces; i++)

-            {

-                tmpFace = this.faces[i];

-                tmp = tmpFace.v3;

-                tmpFace.v3 = tmpFace.v1;

-                tmpFace.v1 = tmp;

-                this.faces[i] = tmpFace;

-            }

-

-            if (this.calcVertexNormals)

-            {

-                int normalCount = this.vertexNormals.Count;

-                if (normalCount > 0)

-                {

-                    Coord n = this.vertexNormals[normalCount - 1];

-                    n.Z = -n.Z;

-                    this.vertexNormals[normalCount - 1] = n;

-                }

-            }

-

-            this.faceNormal.X = -this.faceNormal.X;

-            this.faceNormal.Y = -this.faceNormal.Y;

-            this.faceNormal.Z = -this.faceNormal.Z;

-

-            int numfaceUVs = this.faceUVs.Count;

-            for (i = 0; i < numfaceUVs; i++)

-            {

-                UVCoord uv = this.faceUVs[i];

-                uv.V = 1.0f - uv.V;

-                this.faceUVs[i] = uv;

-            }

-        }

-

-        internal void AddValue2FaceVertexIndices(int num)

-        {

-            int numFaces = this.faces.Count;

-            Face tmpFace;

-            for (int i = 0; i < numFaces; i++)

-            {

-                tmpFace = this.faces[i];

-                tmpFace.v1 += num;

-                tmpFace.v2 += num;

-                tmpFace.v3 += num;

-

-                this.faces[i] = tmpFace;

-            }

-        }

-

-        internal void AddValue2FaceNormalIndices(int num)

-        {

-            if (this.calcVertexNormals)

-            {

-                int numFaces = this.faces.Count;

-                Face tmpFace;

-                for (int i = 0; i < numFaces; i++)

-                {

-                    tmpFace = this.faces[i];

-                    tmpFace.n1 += num;

-                    tmpFace.n2 += num;

-                    tmpFace.n3 += num;

-

-                    this.faces[i] = tmpFace;

-                }

-            }

-        }

-

-        internal void DumpRaw(String path, String name, String title)

-        {

-            if (path == null)

-                return;

-            String fileName = name + "_" + title + ".raw";

-            String completePath = System.IO.Path.Combine(path, fileName);

-            StreamWriter sw = new StreamWriter(completePath);

-

-            for (int i = 0; i < this.faces.Count; i++)

-            {

-                string s = this.coords[this.faces[i].v1].ToString();

-                s += " " + this.coords[this.faces[i].v2].ToString();

-                s += " " + this.coords[this.faces[i].v3].ToString();

-

-                sw.WriteLine(s);

-            }

-

-            sw.Close();

-        }

-    }

-

-    public struct PathNode

-    {

-        public Coord position;

-        public Quat rotation;

-        public float xScale;

-        public float yScale;

-        public float percentOfPath;

-    }

-

-    public enum PathType { Linear = 0, Circular = 1, Flexible = 2 }

-

-    public class Path

-    {

-        public List<PathNode> pathNodes = new List<PathNode>();

-

-        public float twistBegin = 0.0f;

-        public float twistEnd = 0.0f;

-        public float topShearX = 0.0f;

-        public float topShearY = 0.0f;

-        public float pathCutBegin = 0.0f;

-        public float pathCutEnd = 1.0f;

-        public float dimpleBegin = 0.0f;

-        public float dimpleEnd = 1.0f;

-        public float skew = 0.0f;

-        public float holeSizeX = 1.0f; // called pathScaleX in pbs

-        public float holeSizeY = 0.25f;

-        public float taperX = 0.0f;

-        public float taperY = 0.0f;

-        public float radius = 0.0f;

-        public float revolutions = 1.0f;

-        public int stepsPerRevolution = 24;

-

-        private const float twoPi = 2.0f * (float)Math.PI;

-

-        public void Create(PathType pathType, int steps)

-        {

-            if (pathType == PathType.Linear || pathType == PathType.Flexible)

-            {

-                int step = 0;

-

-                float length = this.pathCutEnd - this.pathCutBegin;

-                float twistTotal = twistEnd - twistBegin;

-                float twistTotalAbs = Math.Abs(twistTotal);

-                if (twistTotalAbs > 0.01f)

-                    steps += (int)(twistTotalAbs * 3.66); //  dahlia's magic number

-

-                float start = -0.5f;

-                float stepSize = length / (float)steps;

-                float percentOfPathMultiplier = stepSize;

-                float xOffset = 0.0f;

-                float yOffset = 0.0f;

-                float zOffset = start;

-                float xOffsetStepIncrement = this.topShearX / steps;

-                float yOffsetStepIncrement = this.topShearY / steps;

-

-                float percentOfPath = this.pathCutBegin;

-                zOffset += percentOfPath;

-

-                // sanity checks

-

-                bool done = false;

-

-                while (!done)

-                {

-                    PathNode newNode = new PathNode();

-

-                    newNode.xScale = 1.0f;

-                    if (this.taperX == 0.0f)

-                        newNode.xScale = 1.0f;

-                    else if (this.taperX > 0.0f)

-                        newNode.xScale = 1.0f - percentOfPath * this.taperX;

-                    else newNode.xScale = 1.0f + (1.0f - percentOfPath) * this.taperX;

-

-                    newNode.yScale = 1.0f;

-                    if (this.taperY == 0.0f)

-                        newNode.yScale = 1.0f;

-                    else if (this.taperY > 0.0f)

-                        newNode.yScale = 1.0f - percentOfPath * this.taperY;

-                    else newNode.yScale = 1.0f + (1.0f - percentOfPath) * this.taperY;

-

-                    float twist = twistBegin + twistTotal * percentOfPath;

-

-                    newNode.rotation = new Quat(new Coord(0.0f, 0.0f, 1.0f), twist);

-                    newNode.position = new Coord(xOffset, yOffset, zOffset);

-                    newNode.percentOfPath = percentOfPath;

-

-                    pathNodes.Add(newNode);

-

-                    if (step < steps)

-                    {

-                        step += 1;

-                        percentOfPath += percentOfPathMultiplier;

-                        xOffset += xOffsetStepIncrement;

-                        yOffset += yOffsetStepIncrement;

-                        zOffset += stepSize;

-                        if (percentOfPath > this.pathCutEnd)

-                            done = true;

-                    }

-                    else done = true;

-                }

-            } // end of linear path code

-

-            else // pathType == Circular

-            {

-                float twistTotal = twistEnd - twistBegin;

-

-                // if the profile has a lot of twist, add more layers otherwise the layers may overlap

-                // and the resulting mesh may be quite inaccurate. This method is arbitrary and doesn't

-                // accurately match the viewer

-                float twistTotalAbs = Math.Abs(twistTotal);

-                if (twistTotalAbs > 0.01f)

-                {

-                    if (twistTotalAbs > Math.PI * 1.5f)

-                        steps *= 2;

-                    if (twistTotalAbs > Math.PI * 3.0f)

-                        steps *= 2;

-                }

-

-                float yPathScale = this.holeSizeY * 0.5f;

-                float pathLength = this.pathCutEnd - this.pathCutBegin;

-                float totalSkew = this.skew * 2.0f * pathLength;

-                float skewStart = this.pathCutBegin * 2.0f * this.skew - this.skew;

-                float xOffsetTopShearXFactor = this.topShearX * (0.25f + 0.5f * (0.5f - this.holeSizeY));

-                float yShearCompensation = 1.0f + Math.Abs(this.topShearY) * 0.25f;

-

-                // It's not quite clear what pushY (Y top shear) does, but subtracting it from the start and end

-                // angles appears to approximate it's effects on path cut. Likewise, adding it to the angle used

-                // to calculate the sine for generating the path radius appears to approximate it's effects there

-                // too, but there are some subtle differences in the radius which are noticeable as the prim size

-                // increases and it may affect megaprims quite a bit. The effect of the Y top shear parameter on

-                // the meshes generated with this technique appear nearly identical in shape to the same prims when

-                // displayed by the viewer.

-

-                float startAngle = (twoPi * this.pathCutBegin * this.revolutions) - this.topShearY * 0.9f;

-                float endAngle = (twoPi * this.pathCutEnd * this.revolutions) - this.topShearY * 0.9f;

-                float stepSize = twoPi / this.stepsPerRevolution;

-

-                int step = (int)(startAngle / stepSize);

-                float angle = startAngle;

-

-                bool done = false;

-                while (!done) // loop through the length of the path and add the layers

-                {

-                    PathNode newNode = new PathNode();

-

-                    float xProfileScale = (1.0f - Math.Abs(this.skew)) * this.holeSizeX;

-                    float yProfileScale = this.holeSizeY;

-

-                    float percentOfPath = angle / (twoPi * this.revolutions);

-                    float percentOfAngles = (angle - startAngle) / (endAngle - startAngle);

-

-                    if (this.taperX > 0.01f)

-                        xProfileScale *= 1.0f - percentOfPath * this.taperX;

-                    else if (this.taperX < -0.01f)

-                        xProfileScale *= 1.0f + (1.0f - percentOfPath) * this.taperX;

-

-                    if (this.taperY > 0.01f)

-                        yProfileScale *= 1.0f - percentOfPath * this.taperY;

-                    else if (this.taperY < -0.01f)

-                        yProfileScale *= 1.0f + (1.0f - percentOfPath) * this.taperY;

-

-                    newNode.xScale = xProfileScale;

-                    newNode.yScale = yProfileScale;

-

-                    float radiusScale = 1.0f;

-                    if (this.radius > 0.001f)

-                        radiusScale = 1.0f - this.radius * percentOfPath;

-                    else if (this.radius < 0.001f)

-                        radiusScale = 1.0f + this.radius * (1.0f - percentOfPath);

-

-                    float twist = twistBegin + twistTotal * percentOfPath;

-

-                    float xOffset = 0.5f * (skewStart + totalSkew * percentOfAngles);

-                    xOffset += (float)Math.Sin(angle) * xOffsetTopShearXFactor;

-

-                    float yOffset = yShearCompensation * (float)Math.Cos(angle) * (0.5f - yPathScale) * radiusScale;

-

-                    float zOffset = (float)Math.Sin(angle + this.topShearY) * (0.5f - yPathScale) * radiusScale;

-

-                    newNode.position = new Coord(xOffset, yOffset, zOffset);

-

-                    // now orient the rotation of the profile layer relative to it's position on the path

-                    // adding taperY to the angle used to generate the quat appears to approximate the viewer

-

-                    newNode.rotation = new Quat(new Coord(1.0f, 0.0f, 0.0f), angle + this.topShearY);

-

-                    // next apply twist rotation to the profile layer

-                    if (twistTotal != 0.0f || twistBegin != 0.0f)

-                        newNode.rotation *= new Quat(new Coord(0.0f, 0.0f, 1.0f), twist);

-

-                    newNode.percentOfPath = percentOfPath;

-

-                    pathNodes.Add(newNode);

-

-                    // calculate terms for next iteration

-                    // calculate the angle for the next iteration of the loop

-

-                    if (angle >= endAngle - 0.01)

-                        done = true;

-                    else

-                    {

-                        step += 1;

-                        angle = stepSize * step;

-                        if (angle > endAngle)

-                            angle = endAngle;

-                    }

-                }

-            }

-        }

-    }

-

-    public class PrimMesh

-    {

-        public string errorMessage = "";

-        private const float twoPi = 2.0f * (float)Math.PI;

-

-        public List<Coord> coords;

-        public List<Coord> normals;

-        public List<Face> faces;

-

-        public List<ViewerFace> viewerFaces;

-

-        private int sides = 4;

-        private int hollowSides = 4;

-        private float profileStart = 0.0f;

-        private float profileEnd = 1.0f;

-        private float hollow = 0.0f;

-        public int twistBegin = 0;

-        public int twistEnd = 0;

-        public float topShearX = 0.0f;

-        public float topShearY = 0.0f;

-        public float pathCutBegin = 0.0f;

-        public float pathCutEnd = 1.0f;

-        public float dimpleBegin = 0.0f;

-        public float dimpleEnd = 1.0f;

-        public float skew = 0.0f;

-        public float holeSizeX = 1.0f; // called pathScaleX in pbs

-        public float holeSizeY = 0.25f;

-        public float taperX = 0.0f;

-        public float taperY = 0.0f;

-        public float radius = 0.0f;

-        public float revolutions = 1.0f;

-        public int stepsPerRevolution = 24;

-

-        private bool hasProfileCut = false;

-        private bool hasHollow = false;

-        public bool calcVertexNormals = false;

-        private bool normalsProcessed = false;

-        public bool viewerMode = false;

-

-        public int numPrimFaces = 0;

-

-        /// <summary>

-        /// Human readable string representation of the parameters used to create a mesh.

-        /// </summary>

-        /// <returns></returns>

-        public string ParamsToDisplayString()

-        {

-            string s = "";

-            s += "sides..................: " + this.sides.ToString();

-            s += "\nhollowSides..........: " + this.hollowSides.ToString();

-            s += "\nprofileStart.........: " + this.profileStart.ToString();

-            s += "\nprofileEnd...........: " + this.profileEnd.ToString();

-            s += "\nhollow...............: " + this.hollow.ToString();

-            s += "\ntwistBegin...........: " + this.twistBegin.ToString();

-            s += "\ntwistEnd.............: " + this.twistEnd.ToString();

-            s += "\ntopShearX............: " + this.topShearX.ToString();

-            s += "\ntopShearY............: " + this.topShearY.ToString();

-            s += "\npathCutBegin.........: " + this.pathCutBegin.ToString();

-            s += "\npathCutEnd...........: " + this.pathCutEnd.ToString();

-            s += "\ndimpleBegin..........: " + this.dimpleBegin.ToString();

-            s += "\ndimpleEnd............: " + this.dimpleEnd.ToString();

-            s += "\nskew.................: " + this.skew.ToString();

-            s += "\nholeSizeX............: " + this.holeSizeX.ToString();

-            s += "\nholeSizeY............: " + this.holeSizeY.ToString();

-            s += "\ntaperX...............: " + this.taperX.ToString();

-            s += "\ntaperY...............: " + this.taperY.ToString();

-            s += "\nradius...............: " + this.radius.ToString();

-            s += "\nrevolutions..........: " + this.revolutions.ToString();

-            s += "\nstepsPerRevolution...: " + this.stepsPerRevolution.ToString();

-

-            return s;

-        }

-

-        /// <summary>

-        /// Constructs a PrimMesh object and creates the profile for extrusion.

-        /// </summary>

-        /// <param name="sides"></param>

-        /// <param name="profileStart"></param>

-        /// <param name="profileEnd"></param>

-        /// <param name="hollow"></param>

-        /// <param name="hollowSides"></param>

-        public PrimMesh(int sides, float profileStart, float profileEnd, float hollow, int hollowSides)

-        {

-            this.coords = new List<Coord>();

-            this.faces = new List<Face>();

-

-            this.sides = sides;

-            this.profileStart = profileStart;

-            this.profileEnd = profileEnd;

-            this.hollow = hollow;

-            this.hollowSides = hollowSides;

-

-            if (sides < 3)

-                this.sides = 3;

-            if (hollowSides < 3)

-                this.hollowSides = 3;

-            if (profileStart < 0.0f)

-                this.profileStart = 0.0f;

-            if (profileEnd > 1.0f)

-                this.profileEnd = 1.0f;

-            if (profileEnd < 0.02f)

-                this.profileEnd = 0.02f;

-            if (profileStart >= profileEnd)

-                this.profileStart = profileEnd - 0.02f;

-            if (hollow > 0.99f)

-                this.hollow = 0.99f;

-            if (hollow < 0.0f)

-                this.hollow = 0.0f;

-

-            this.hasProfileCut = (this.profileStart > 0.0f || this.profileEnd < 1.0f);

-            this.hasHollow = (this.hollow > 0.001f);

-        }

-

-        /// <summary>

-        /// Extrudes a profile along a path.

-        /// </summary>

-        public void Extrude(PathType pathType)

-        {

-            this.coords = new List<Coord>();

-            this.faces = new List<Face>();

-

-            if (this.viewerMode)

-            {

-                this.viewerFaces = new List<ViewerFace>();

-                this.calcVertexNormals = true;

-            }

-

-            if (this.calcVertexNormals)

-                this.normals = new List<Coord>();

-

-            int steps = 1;

-

-            float length = this.pathCutEnd - this.pathCutBegin;

-            normalsProcessed = false;

-

-            if (this.viewerMode && this.sides == 3)

-            {

-                // prisms don't taper well so add some vertical resolution

-                // other prims may benefit from this but just do prisms for now

-                if (Math.Abs(this.taperX) > 0.01 || Math.Abs(this.taperY) > 0.01)

-                    steps = (int)(steps * 4.5 * length);

-            }

-

-

-            float twistBegin = this.twistBegin / 360.0f * twoPi;

-            float twistEnd = this.twistEnd / 360.0f * twoPi;

-            float twistTotal = twistEnd - twistBegin;

-            float twistTotalAbs = Math.Abs(twistTotal);

-            if (twistTotalAbs > 0.01f)

-                steps += (int)(twistTotalAbs * 3.66); //  dahlia's magic number

-

-            float hollow = this.hollow;

-

-            // sanity checks

-            float initialProfileRot = 0.0f;

-            if (pathType == PathType.Circular)

-            {

-                if (this.sides == 3)

-                {

-                    initialProfileRot = (float)Math.PI;

-                    if (this.hollowSides == 4)

-                    {

-                        if (hollow > 0.7f)

-                            hollow = 0.7f;

-                        hollow *= 0.707f;

-                    }

-                    else hollow *= 0.5f;

-                }

-                else if (this.sides == 4)

-                {

-                    initialProfileRot = 0.25f * (float)Math.PI;

-                    if (this.hollowSides != 4)

-                        hollow *= 0.707f;

-                }

-                else if (this.sides > 4)

-                {

-                    initialProfileRot = (float)Math.PI;

-                    if (this.hollowSides == 4)

-                    {

-                        if (hollow > 0.7f)

-                            hollow = 0.7f;

-                        hollow /= 0.7f;

-                    }

-                }

-            }

-            else

-            {

-                if (this.sides == 3)

-                {

-                    if (this.hollowSides == 4)

-                    {

-                        if (hollow > 0.7f)

-                            hollow = 0.7f;

-                        hollow *= 0.707f;

-                    }

-                    else hollow *= 0.5f;

-                }

-                else if (this.sides == 4)

-                {

-                    initialProfileRot = 1.25f * (float)Math.PI;

-                    if (this.hollowSides != 4)

-                        hollow *= 0.707f;

-                }

-                else if (this.sides == 24 && this.hollowSides == 4)

-                    hollow *= 1.414f;

-            }

-

-            Profile profile = new Profile(this.sides, this.profileStart, this.profileEnd, hollow, this.hollowSides, true, calcVertexNormals);

-            this.errorMessage = profile.errorMessage;

-

-            this.numPrimFaces = profile.numPrimFaces;

-

-            int cut1Vert = -1;

-            int cut2Vert = -1;

-            if (hasProfileCut)

-            {

-                cut1Vert = hasHollow ? profile.coords.Count - 1 : 0;

-                cut2Vert = hasHollow ? profile.numOuterVerts - 1 : profile.numOuterVerts;

-            }

-

-            if (initialProfileRot != 0.0f)

-            {

-                profile.AddRot(new Quat(new Coord(0.0f, 0.0f, 1.0f), initialProfileRot));

-                if (viewerMode)

-                    profile.MakeFaceUVs();

-            }

-

-            Coord lastCutNormal1 = new Coord();

-            Coord lastCutNormal2 = new Coord();

-            float lastV = 1.0f;

-

-            Path path = new Path();

-            path.twistBegin = twistBegin;

-            path.twistEnd = twistEnd;

-            path.topShearX = topShearX;

-            path.topShearY = topShearY;

-            path.pathCutBegin = pathCutBegin;

-            path.pathCutEnd = pathCutEnd;

-            path.dimpleBegin = dimpleBegin;

-            path.dimpleEnd = dimpleEnd;

-            path.skew = skew;

-            path.holeSizeX = holeSizeX;

-            path.holeSizeY = holeSizeY;

-            path.taperX = taperX;

-            path.taperY = taperY;

-            path.radius = radius;

-            path.revolutions = revolutions;

-            path.stepsPerRevolution = stepsPerRevolution;

-

-            path.Create(pathType, steps);

-

-            bool needEndFaces = false;

-            if (pathType == PathType.Circular)

-            {

-                needEndFaces = false;

-                if (this.pathCutBegin != 0.0f || this.pathCutEnd != 1.0f)

-                    needEndFaces = true;

-                else if (this.taperX != 0.0f || this.taperY != 0.0f)

-                    needEndFaces = true;

-                else if (this.skew != 0.0f)

-                    needEndFaces = true;

-                else if (twistTotal != 0.0f)

-                    needEndFaces = true;

-                else if (this.radius != 0.0f)

-                    needEndFaces = true;

-            }

-            else needEndFaces = true;

-

-            for (int nodeIndex = 0; nodeIndex < path.pathNodes.Count; nodeIndex++)

-            {

-                PathNode node = path.pathNodes[nodeIndex];

-                Profile newLayer = profile.Copy();

-                newLayer.Scale(node.xScale, node.yScale);

-

-                newLayer.AddRot(node.rotation);

-                newLayer.AddPos(node.position);

-

-                if (needEndFaces && nodeIndex == 0)

-                {

-                    newLayer.FlipNormals();

-

-                    // add the top faces to the viewerFaces list here

-                    if (this.viewerMode)

-                    {

-                        Coord faceNormal = newLayer.faceNormal;

-                        ViewerFace newViewerFace = new ViewerFace(profile.bottomFaceNumber);

-                        int numFaces = newLayer.faces.Count;

-                        List<Face> faces = newLayer.faces;

-

-                        for (int i = 0; i < numFaces; i++)

-                        {

-                            Face face = faces[i];

-                            newViewerFace.v1 = newLayer.coords[face.v1];

-                            newViewerFace.v2 = newLayer.coords[face.v2];

-                            newViewerFace.v3 = newLayer.coords[face.v3];

-

-                            newViewerFace.coordIndex1 = face.v1;

-                            newViewerFace.coordIndex2 = face.v2;

-                            newViewerFace.coordIndex3 = face.v3;

-

-                            newViewerFace.n1 = faceNormal;

-                            newViewerFace.n2 = faceNormal;

-                            newViewerFace.n3 = faceNormal;

-

-                            newViewerFace.uv1 = newLayer.faceUVs[face.v1];

-                            newViewerFace.uv2 = newLayer.faceUVs[face.v2];

-                            newViewerFace.uv3 = newLayer.faceUVs[face.v3];

-

-                            this.viewerFaces.Add(newViewerFace);

-                        }

-                    }

-                } // if (nodeIndex == 0)

-

-                // append this layer

-

-                int coordsLen = this.coords.Count;

-                newLayer.AddValue2FaceVertexIndices(coordsLen);

-

-                this.coords.AddRange(newLayer.coords);

-

-                if (this.calcVertexNormals)

-                {

-                    newLayer.AddValue2FaceNormalIndices(this.normals.Count);

-                    this.normals.AddRange(newLayer.vertexNormals);

-                }

-

-                if (node.percentOfPath < this.pathCutBegin + 0.01f || node.percentOfPath > this.pathCutEnd - 0.01f)

-                    this.faces.AddRange(newLayer.faces);

-

-                // fill faces between layers

-

-                int numVerts = newLayer.coords.Count;

-                Face newFace = new Face();

-

-                if (nodeIndex > 0)

-                {

-                    int startVert = coordsLen + 1;

-                    int endVert = this.coords.Count;

-

-                    if (sides < 5 || this.hasProfileCut || hollow > 0.0f)

-                        startVert--;

-

-                    for (int i = startVert; i < endVert; i++)

-                    {

-                        int iNext = i + 1;

-                        if (i == endVert - 1)

-                            iNext = startVert;

-

-                        int whichVert = i - startVert;

-

-                        newFace.v1 = i;

-                        newFace.v2 = i - numVerts;

-                        newFace.v3 = iNext - numVerts;

-                        this.faces.Add(newFace);

-

-                        newFace.v2 = iNext - numVerts;

-                        newFace.v3 = iNext;

-                        this.faces.Add(newFace);

-

-                        if (this.viewerMode)

-                        {

-                            // add the side faces to the list of viewerFaces here

-

-                            int primFaceNum = profile.faceNumbers[whichVert];

-                            if (!needEndFaces)

-                                primFaceNum -= 1;

-

-                            ViewerFace newViewerFace1 = new ViewerFace(primFaceNum);

-                            ViewerFace newViewerFace2 = new ViewerFace(primFaceNum);

-

-                            float u1 = newLayer.us[whichVert];

-                            float u2 = 1.0f;

-                            if (whichVert < newLayer.us.Count - 1)

-                                u2 = newLayer.us[whichVert + 1];

-

-                            if (whichVert == cut1Vert || whichVert == cut2Vert)

-                            {

-                                u1 = 0.0f;

-                                u2 = 1.0f;

-                            }

-                            else if (sides < 5)

-                            {

-                                if (whichVert < profile.numOuterVerts)

-                                { // boxes and prisms have one texture face per side of the prim, so the U values have to be scaled

-                                    // to reflect the entire texture width

-                                    u1 *= sides;

-                                    u2 *= sides;

-                                    u2 -= (int)u1;

-                                    u1 -= (int)u1;

-                                    if (u2 < 0.1f)

-                                        u2 = 1.0f;

-                                }

-                                else if (whichVert > profile.coords.Count - profile.numHollowVerts - 1)

-                                {

-                                    u1 *= 2.0f;

-                                    u2 *= 2.0f;

-                                }

-                            }

-

-                            newViewerFace1.uv1.U = u1;

-                            newViewerFace1.uv2.U = u1;

-                            newViewerFace1.uv3.U = u2;

-

-                            newViewerFace1.uv1.V = 1.0f - node.percentOfPath;

-                            newViewerFace1.uv2.V = lastV;

-                            newViewerFace1.uv3.V = lastV;

-

-                            newViewerFace2.uv1.U = u1;

-                            newViewerFace2.uv2.U = u2;

-                            newViewerFace2.uv3.U = u2;

-

-                            newViewerFace2.uv1.V = 1.0f - node.percentOfPath;

-                            newViewerFace2.uv2.V = lastV;

-                            newViewerFace2.uv3.V = 1.0f - node.percentOfPath;

-

-                            newViewerFace1.v1 = this.coords[i];

-                            newViewerFace1.v2 = this.coords[i - numVerts];

-                            newViewerFace1.v3 = this.coords[iNext - numVerts];

-

-                            newViewerFace2.v1 = this.coords[i];

-                            newViewerFace2.v2 = this.coords[iNext - numVerts];

-                            newViewerFace2.v3 = this.coords[iNext];

-

-                            newViewerFace1.coordIndex1 = i;

-                            newViewerFace1.coordIndex2 = i - numVerts;

-                            newViewerFace1.coordIndex3 = iNext - numVerts;

-

-                            newViewerFace2.coordIndex1 = i;

-                            newViewerFace2.coordIndex2 = iNext - numVerts;

-                            newViewerFace2.coordIndex3 = iNext;

-

-                            // profile cut faces

-                            if (whichVert == cut1Vert)

-                            {

-                                newViewerFace1.n1 = newLayer.cutNormal1;

-                                newViewerFace1.n2 = newViewerFace1.n3 = lastCutNormal1;

-

-                                newViewerFace2.n1 = newViewerFace2.n3 = newLayer.cutNormal1;

-                                newViewerFace2.n2 = lastCutNormal1;

-                            }

-                            else if (whichVert == cut2Vert)

-                            {

-                                newViewerFace1.n1 = newLayer.cutNormal2;

-                                newViewerFace1.n2 = newViewerFace1.n3 = lastCutNormal2;

-

-                                newViewerFace2.n1 = newViewerFace2.n3 = newLayer.cutNormal2;

-                                newViewerFace2.n2 = lastCutNormal2;

-                            }

-

-                            else // outer and hollow faces

-                            {

-                                if ((sides < 5 && whichVert < newLayer.numOuterVerts) || (hollowSides < 5 && whichVert >= newLayer.numOuterVerts))

-                                { // looks terrible when path is twisted... need vertex normals here

-                                    newViewerFace1.CalcSurfaceNormal();

-                                    newViewerFace2.CalcSurfaceNormal();

-                                }

-                                else

-                                {

-                                    newViewerFace1.n1 = this.normals[i];

-                                    newViewerFace1.n2 = this.normals[i - numVerts];

-                                    newViewerFace1.n3 = this.normals[iNext - numVerts];

-

-                                    newViewerFace2.n1 = this.normals[i];

-                                    newViewerFace2.n2 = this.normals[iNext - numVerts];

-                                    newViewerFace2.n3 = this.normals[iNext];

-                                }

-                            }

-

-                            this.viewerFaces.Add(newViewerFace1);

-                            this.viewerFaces.Add(newViewerFace2);

-

-                        }

-                    }

-                }

-

-                lastCutNormal1 = newLayer.cutNormal1;

-                lastCutNormal2 = newLayer.cutNormal2;

-                lastV = 1.0f - node.percentOfPath;

-

-                if (needEndFaces && nodeIndex == path.pathNodes.Count - 1 && viewerMode)

-                {

-                    // add the top faces to the viewerFaces list here

-                    Coord faceNormal = newLayer.faceNormal;

-                    ViewerFace newViewerFace = new ViewerFace();

-                    newViewerFace.primFaceNumber = 0;

-                    int numFaces = newLayer.faces.Count;

-                    List<Face> faces = newLayer.faces;

-

-                    for (int i = 0; i < numFaces; i++)

-                    {

-                        Face face = faces[i];

-                        newViewerFace.v1 = newLayer.coords[face.v1 - coordsLen];

-                        newViewerFace.v2 = newLayer.coords[face.v2 - coordsLen];

-                        newViewerFace.v3 = newLayer.coords[face.v3 - coordsLen];

-

-                        newViewerFace.coordIndex1 = face.v1 - coordsLen;

-                        newViewerFace.coordIndex2 = face.v2 - coordsLen;

-                        newViewerFace.coordIndex3 = face.v3 - coordsLen;

-

-                        newViewerFace.n1 = faceNormal;

-                        newViewerFace.n2 = faceNormal;

-                        newViewerFace.n3 = faceNormal;

-

-                        newViewerFace.uv1 = newLayer.faceUVs[face.v1 - coordsLen];

-                        newViewerFace.uv2 = newLayer.faceUVs[face.v2 - coordsLen];

-                        newViewerFace.uv3 = newLayer.faceUVs[face.v3 - coordsLen];

-

-                        this.viewerFaces.Add(newViewerFace);

-                    }

-                }

-

-

-            } // for (int nodeIndex = 0; nodeIndex < path.pathNodes.Count; nodeIndex++)

-

-        }

-

-

-        /// <summary>

-        /// DEPRICATED - use Extrude(PathType.Linear) instead

-        /// Extrudes a profile along a straight line path. Used for prim types box, cylinder, and prism.

-        /// </summary>

-        /// 

-        public void ExtrudeLinear()

-        {

-            this.Extrude(PathType.Linear);

-        }

-

-

-        /// <summary>

-        /// DEPRICATED - use Extrude(PathType.Circular) instead

-        /// Extrude a profile into a circular path prim mesh. Used for prim types torus, tube, and ring.

-        /// </summary>

-        /// 

-        public void ExtrudeCircular()

-        {

-            this.Extrude(PathType.Circular);

-        }

-

-

-        private Coord SurfaceNormal(Coord c1, Coord c2, Coord c3)

-        {

-            Coord edge1 = new Coord(c2.X - c1.X, c2.Y - c1.Y, c2.Z - c1.Z);

-            Coord edge2 = new Coord(c3.X - c1.X, c3.Y - c1.Y, c3.Z - c1.Z);

-

-            Coord normal = Coord.Cross(edge1, edge2);

-

-            normal.Normalize();

-

-            return normal;

-        }

-

-        private Coord SurfaceNormal(Face face)

-        {

-            return SurfaceNormal(this.coords[face.v1], this.coords[face.v2], this.coords[face.v3]);

-        }

-

-        /// <summary>

-        /// Calculate the surface normal for a face in the list of faces

-        /// </summary>

-        /// <param name="faceIndex"></param>

-        /// <returns></returns>

-        public Coord SurfaceNormal(int faceIndex)

-        {

-            int numFaces = this.faces.Count;

-            if (faceIndex < 0 || faceIndex >= numFaces)

-                throw new Exception("faceIndex out of range");

-

-            return SurfaceNormal(this.faces[faceIndex]);

-        }

-

-        /// <summary>

-        /// Duplicates a PrimMesh object. All object properties are copied by value, including lists.

-        /// </summary>

-        /// <returns></returns>

-        public PrimMesh Copy()

-        {

-            PrimMesh copy = new PrimMesh(this.sides, this.profileStart, this.profileEnd, this.hollow, this.hollowSides);

-            copy.twistBegin = this.twistBegin;

-            copy.twistEnd = this.twistEnd;

-            copy.topShearX = this.topShearX;

-            copy.topShearY = this.topShearY;

-            copy.pathCutBegin = this.pathCutBegin;

-            copy.pathCutEnd = this.pathCutEnd;

-            copy.dimpleBegin = this.dimpleBegin;

-            copy.dimpleEnd = this.dimpleEnd;

-            copy.skew = this.skew;

-            copy.holeSizeX = this.holeSizeX;

-            copy.holeSizeY = this.holeSizeY;

-            copy.taperX = this.taperX;

-            copy.taperY = this.taperY;

-            copy.radius = this.radius;

-            copy.revolutions = this.revolutions;

-            copy.stepsPerRevolution = this.stepsPerRevolution;

-            copy.calcVertexNormals = this.calcVertexNormals;

-            copy.normalsProcessed = this.normalsProcessed;

-            copy.viewerMode = this.viewerMode;

-            copy.numPrimFaces = this.numPrimFaces;

-            copy.errorMessage = this.errorMessage;

-

-            copy.coords = new List<Coord>(this.coords);

-            copy.faces = new List<Face>(this.faces);

-            copy.viewerFaces = new List<ViewerFace>(this.viewerFaces);

-            copy.normals = new List<Coord>(this.normals);

-

-            return copy;

-        }

-

-        /// <summary>

-        /// Calculate surface normals for all of the faces in the list of faces in this mesh

-        /// </summary>

-        public void CalcNormals()

-        {

-            if (normalsProcessed)

-                return;

-

-            normalsProcessed = true;

-

-            int numFaces = faces.Count;

-

-            if (!this.calcVertexNormals)

-                this.normals = new List<Coord>();

-

-            for (int i = 0; i < numFaces; i++)

-            {

-                Face face = faces[i];

-

-                this.normals.Add(SurfaceNormal(i).Normalize());

-

-                int normIndex = normals.Count - 1;

-                face.n1 = normIndex;

-                face.n2 = normIndex;

-                face.n3 = normIndex;

-

-                this.faces[i] = face;

-            }

-        }

-

-        /// <summary>

-        /// Adds a value to each XYZ vertex coordinate in the mesh

-        /// </summary>

-        /// <param name="x"></param>

-        /// <param name="y"></param>

-        /// <param name="z"></param>

-        public void AddPos(float x, float y, float z)

-        {

-            int i;

-            int numVerts = this.coords.Count;

-            Coord vert;

-

-            for (i = 0; i < numVerts; i++)

-            {

-                vert = this.coords[i];

-                vert.X += x;

-                vert.Y += y;

-                vert.Z += z;

-                this.coords[i] = vert;

-            }

-

-            if (this.viewerFaces != null)

-            {

-                int numViewerFaces = this.viewerFaces.Count;

-

-                for (i = 0; i < numViewerFaces; i++)

-                {

-                    ViewerFace v = this.viewerFaces[i];

-                    v.AddPos(x, y, z);

-                    this.viewerFaces[i] = v;

-                }

-            }

-        }

-

-        /// <summary>

-        /// Rotates the mesh

-        /// </summary>

-        /// <param name="q"></param>

-        public void AddRot(Quat q)

-        {

-            int i;

-            int numVerts = this.coords.Count;

-

-            for (i = 0; i < numVerts; i++)

-                this.coords[i] *= q;

-

-            if (this.normals != null)

-            {

-                int numNormals = this.normals.Count;

-                for (i = 0; i < numNormals; i++)

-                    this.normals[i] *= q;

-            }

-

-            if (this.viewerFaces != null)

-            {

-                int numViewerFaces = this.viewerFaces.Count;

-

-                for (i = 0; i < numViewerFaces; i++)

-                {

-                    ViewerFace v = this.viewerFaces[i];

-                    v.v1 *= q;

-                    v.v2 *= q;

-                    v.v3 *= q;

-

-                    v.n1 *= q;

-                    v.n2 *= q;

-                    v.n3 *= q;

-                    this.viewerFaces[i] = v;

-                }

-            }

-        }

-

-#if VERTEX_INDEXER

-        public VertexIndexer GetVertexIndexer()

-        {

-            if (this.viewerMode && this.viewerFaces.Count > 0)

-                return new VertexIndexer(this);

-            return null;

-        }

-#endif

-

-        /// <summary>

-        /// Scales the mesh

-        /// </summary>

-        /// <param name="x"></param>

-        /// <param name="y"></param>

-        /// <param name="z"></param>

-        public void Scale(float x, float y, float z)

-        {

-            int i;

-            int numVerts = this.coords.Count;

-            //Coord vert;

-

-            Coord m = new Coord(x, y, z);

-            for (i = 0; i < numVerts; i++)

-                this.coords[i] *= m;

-

-            if (this.viewerFaces != null)

-            {

-                int numViewerFaces = this.viewerFaces.Count;

-                for (i = 0; i < numViewerFaces; i++)

-                {

-                    ViewerFace v = this.viewerFaces[i];

-                    v.v1 *= m;

-                    v.v2 *= m;

-                    v.v3 *= m;

-                    this.viewerFaces[i] = v;

-                }

-

-            }

-

-        }

-

-        /// <summary>

-        /// Dumps the mesh to a Blender compatible "Raw" format file

-        /// </summary>

-        /// <param name="path"></param>

-        /// <param name="name"></param>

-        /// <param name="title"></param>

-        public void DumpRaw(String path, String name, String title)

-        {

-            if (path == null)

-                return;

-            String fileName = name + "_" + title + ".raw";

-            String completePath = System.IO.Path.Combine(path, fileName);

-            StreamWriter sw = new StreamWriter(completePath);

-

-            for (int i = 0; i < this.faces.Count; i++)

-            {

-                string s = this.coords[this.faces[i].v1].ToString();

-                s += " " + this.coords[this.faces[i].v2].ToString();

-                s += " " + this.coords[this.faces[i].v3].ToString();

-

-                sw.WriteLine(s);

-            }

-

-            sw.Close();

-        }

-    }

-}

+/*
+ * Copyright (c) Contributors
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+
+namespace PrimMesher
+{
+    public struct Quat
+    {
+        /// <summary>X value</summary>
+        public float X;
+        /// <summary>Y value</summary>
+        public float Y;
+        /// <summary>Z value</summary>
+        public float Z;
+        /// <summary>W value</summary>
+        public float W;
+
+        public Quat(float x, float y, float z, float w)
+        {
+            X = x;
+            Y = y;
+            Z = z;
+            W = w;
+        }
+
+        public Quat(Coord axis, float angle)
+        {
+            axis = axis.Normalize();
+
+            angle *= 0.5f;
+            float c = (float)Math.Cos(angle);
+            float s = (float)Math.Sin(angle);
+
+            X = axis.X * s;
+            Y = axis.Y * s;
+            Z = axis.Z * s;
+            W = c;
+
+            Normalize();
+        }
+
+        public float Length()
+        {
+            return (float)Math.Sqrt(X * X + Y * Y + Z * Z + W * W);
+        }
+
+        public Quat Normalize()
+        {
+            const float MAG_THRESHOLD = 0.0000001f;
+            float mag = Length();
+
+            // Catch very small rounding errors when normalizing
+            if (mag > MAG_THRESHOLD)
+            {
+                float oomag = 1f / mag;
+                X *= oomag;
+                Y *= oomag;
+                Z *= oomag;
+                W *= oomag;
+            }
+            else
+            {
+                X = 0f;
+                Y = 0f;
+                Z = 0f;
+                W = 1f;
+            }
+
+            return this;
+        }
+
+        public static Quat operator *(Quat q1, Quat q2)
+        {
+            float x = q1.W * q2.X + q1.X * q2.W + q1.Y * q2.Z - q1.Z * q2.Y;
+            float y = q1.W * q2.Y - q1.X * q2.Z + q1.Y * q2.W + q1.Z * q2.X;
+            float z = q1.W * q2.Z + q1.X * q2.Y - q1.Y * q2.X + q1.Z * q2.W;
+            float w = q1.W * q2.W - q1.X * q2.X - q1.Y * q2.Y - q1.Z * q2.Z;
+            return new Quat(x, y, z, w);
+        }
+
+        public override string ToString()
+        {
+            return "< X: " + this.X.ToString() + ", Y: " + this.Y.ToString() + ", Z: " + this.Z.ToString() + ", W: " + this.W.ToString() + ">";
+        }
+    }
+
+    public struct Coord
+    {
+        public float X;
+        public float Y;
+        public float Z;
+
+        public Coord(float x, float y, float z)
+        {
+            this.X = x;
+            this.Y = y;
+            this.Z = z;
+        }
+
+        public float Length()
+        {
+            return (float)Math.Sqrt(this.X * this.X + this.Y * this.Y + this.Z * this.Z);
+        }
+
+        public Coord Invert()
+        {
+            this.X = -this.X;
+            this.Y = -this.Y;
+            this.Z = -this.Z;
+
+            return this;
+        }
+
+        public Coord Normalize()
+        {
+            const float MAG_THRESHOLD = 0.0000001f;
+            float mag = Length();
+
+            // Catch very small rounding errors when normalizing
+            if (mag > MAG_THRESHOLD)
+            {
+                float oomag = 1.0f / mag;
+                this.X *= oomag;
+                this.Y *= oomag;
+                this.Z *= oomag;
+            }
+            else
+            {
+                this.X = 0.0f;
+                this.Y = 0.0f;
+                this.Z = 0.0f;
+            }
+
+            return this;
+        }
+
+        public override string ToString()
+        {
+            return this.X.ToString() + " " + this.Y.ToString() + " " + this.Z.ToString();
+        }
+
+        public static Coord Cross(Coord c1, Coord c2)
+        {
+            return new Coord(
+                c1.Y * c2.Z - c2.Y * c1.Z,
+                c1.Z * c2.X - c2.Z * c1.X,
+                c1.X * c2.Y - c2.X * c1.Y
+                );
+        }
+
+        public static Coord operator +(Coord v, Coord a)
+        {
+            return new Coord(v.X + a.X, v.Y + a.Y, v.Z + a.Z);
+        }
+
+        public static Coord operator *(Coord v, Coord m)
+        {
+            return new Coord(v.X * m.X, v.Y * m.Y, v.Z * m.Z);
+        }
+
+        public static Coord operator *(Coord v, Quat q)
+        {
+            // From http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/transforms/
+
+            Coord c2 = new Coord(0.0f, 0.0f, 0.0f);
+
+            c2.X = q.W * q.W * v.X +
+                2f * q.Y * q.W * v.Z -
+                2f * q.Z * q.W * v.Y +
+                     q.X * q.X * v.X +
+                2f * q.Y * q.X * v.Y +
+                2f * q.Z * q.X * v.Z -
+                     q.Z * q.Z * v.X -
+                     q.Y * q.Y * v.X;
+
+            c2.Y =
+                2f * q.X * q.Y * v.X +
+                     q.Y * q.Y * v.Y +
+                2f * q.Z * q.Y * v.Z +
+                2f * q.W * q.Z * v.X -
+                     q.Z * q.Z * v.Y +
+                     q.W * q.W * v.Y -
+                2f * q.X * q.W * v.Z -
+                     q.X * q.X * v.Y;
+
+            c2.Z =
+                2f * q.X * q.Z * v.X +
+                2f * q.Y * q.Z * v.Y +
+                     q.Z * q.Z * v.Z -
+                2f * q.W * q.Y * v.X -
+                     q.Y * q.Y * v.Z +
+                2f * q.W * q.X * v.Y -
+                     q.X * q.X * v.Z +
+                     q.W * q.W * v.Z;
+
+            return c2;
+        }
+    }
+
+    public struct UVCoord
+    {
+        public float U;
+        public float V;
+
+
+        public UVCoord(float u, float v)
+        {
+            this.U = u;
+            this.V = v;
+        }
+    }
+
+    public struct Face
+    {
+        public int primFace;
+
+        // vertices
+        public int v1;
+        public int v2;
+        public int v3;
+
+        //normals
+        public int n1;
+        public int n2;
+        public int n3;
+
+        // uvs
+        public int uv1;
+        public int uv2;
+        public int uv3;
+
+
+        public Face(int v1, int v2, int v3)
+        {
+            primFace = 0;
+
+            this.v1 = v1;
+            this.v2 = v2;
+            this.v3 = v3;
+
+            this.n1 = 0;
+            this.n2 = 0;
+            this.n3 = 0;
+
+            this.uv1 = 0;
+            this.uv2 = 0;
+            this.uv3 = 0;
+
+        }
+
+        public Face(int v1, int v2, int v3, int n1, int n2, int n3)
+        {
+            primFace = 0;
+
+            this.v1 = v1;
+            this.v2 = v2;
+            this.v3 = v3;
+
+            this.n1 = n1;
+            this.n2 = n2;
+            this.n3 = n3;
+
+            this.uv1 = 0;
+            this.uv2 = 0;
+            this.uv3 = 0;
+        }
+
+        public Coord SurfaceNormal(List<Coord> coordList)
+        {
+            Coord c1 = coordList[this.v1];
+            Coord c2 = coordList[this.v2];
+            Coord c3 = coordList[this.v3];
+
+            Coord edge1 = new Coord(c2.X - c1.X, c2.Y - c1.Y, c2.Z - c1.Z);
+            Coord edge2 = new Coord(c3.X - c1.X, c3.Y - c1.Y, c3.Z - c1.Z);
+
+            return Coord.Cross(edge1, edge2).Normalize();
+        }
+    }
+
+    public struct ViewerFace
+    {
+        public int primFaceNumber;
+
+        public Coord v1;
+        public Coord v2;
+        public Coord v3;
+
+        public int coordIndex1;
+        public int coordIndex2;
+        public int coordIndex3;
+
+        public Coord n1;
+        public Coord n2;
+        public Coord n3;
+
+        public UVCoord uv1;
+        public UVCoord uv2;
+        public UVCoord uv3;
+
+        public ViewerFace(int primFaceNumber)
+        {
+            this.primFaceNumber = primFaceNumber;
+
+            this.v1 = new Coord();
+            this.v2 = new Coord();
+            this.v3 = new Coord();
+
+            this.coordIndex1 = this.coordIndex2 = this.coordIndex3 = -1; // -1 means not assigned yet
+
+            this.n1 = new Coord();
+            this.n2 = new Coord();
+            this.n3 = new Coord();
+
+            this.uv1 = new UVCoord();
+            this.uv2 = new UVCoord();
+            this.uv3 = new UVCoord();
+        }
+
+        public void Scale(float x, float y, float z)
+        {
+            this.v1.X *= x;
+            this.v1.Y *= y;
+            this.v1.Z *= z;
+
+            this.v2.X *= x;
+            this.v2.Y *= y;
+            this.v2.Z *= z;
+
+            this.v3.X *= x;
+            this.v3.Y *= y;
+            this.v3.Z *= z;
+        }
+
+        public void AddPos(float x, float y, float z)
+        {
+            this.v1.X += x;
+            this.v2.X += x;
+            this.v3.X += x;
+
+            this.v1.Y += y;
+            this.v2.Y += y;
+            this.v3.Y += y;
+
+            this.v1.Z += z;
+            this.v2.Z += z;
+            this.v3.Z += z;
+        }
+
+        public void AddRot(Quat q)
+        {
+            this.v1 *= q;
+            this.v2 *= q;
+            this.v3 *= q;
+
+            this.n1 *= q;
+            this.n2 *= q;
+            this.n3 *= q;
+        }
+
+        public void CalcSurfaceNormal()
+        {
+
+            Coord edge1 = new Coord(this.v2.X - this.v1.X, this.v2.Y - this.v1.Y, this.v2.Z - this.v1.Z);
+            Coord edge2 = new Coord(this.v3.X - this.v1.X, this.v3.Y - this.v1.Y, this.v3.Z - this.v1.Z);
+
+            this.n1 = this.n2 = this.n3 = Coord.Cross(edge1, edge2).Normalize();
+        }
+    }
+
+    internal struct Angle
+    {
+        internal float angle;
+        internal float X;
+        internal float Y;
+
+        internal Angle(float angle, float x, float y)
+        {
+            this.angle = angle;
+            this.X = x;
+            this.Y = y;
+        }
+    }
+
+    internal class AngleList
+    {
+        private float iX, iY; // intersection point
+
+        private static Angle[] angles3 =
+        {
+            new Angle(0.0f, 1.0f, 0.0f),
+            new Angle(0.33333333333333333f, -0.5f, 0.86602540378443871f),
+            new Angle(0.66666666666666667f, -0.5f, -0.86602540378443837f),
+            new Angle(1.0f, 1.0f, 0.0f)
+        };
+
+        private static Coord[] normals3 =
+        {
+            new Coord(0.25f, 0.4330127019f, 0.0f).Normalize(),
+            new Coord(-0.5f, 0.0f, 0.0f).Normalize(),
+            new Coord(0.25f, -0.4330127019f, 0.0f).Normalize(),
+            new Coord(0.25f, 0.4330127019f, 0.0f).Normalize()
+        };
+
+        private static Angle[] angles4 =
+        {
+            new Angle(0.0f, 1.0f, 0.0f),
+            new Angle(0.25f, 0.0f, 1.0f),
+            new Angle(0.5f, -1.0f, 0.0f),
+            new Angle(0.75f, 0.0f, -1.0f),
+            new Angle(1.0f, 1.0f, 0.0f)
+        };
+
+        private static Coord[] normals4 = 
+        {
+            new Coord(0.5f, 0.5f, 0.0f).Normalize(),
+            new Coord(-0.5f, 0.5f, 0.0f).Normalize(),
+            new Coord(-0.5f, -0.5f, 0.0f).Normalize(),
+            new Coord(0.5f, -0.5f, 0.0f).Normalize(),
+            new Coord(0.5f, 0.5f, 0.0f).Normalize()
+        };
+
+        private static Angle[] angles24 =
+        {
+            new Angle(0.0f, 1.0f, 0.0f),
+            new Angle(0.041666666666666664f, 0.96592582628906831f, 0.25881904510252074f),
+            new Angle(0.083333333333333329f, 0.86602540378443871f, 0.5f),
+            new Angle(0.125f, 0.70710678118654757f, 0.70710678118654746f),
+            new Angle(0.16666666666666667f, 0.5f, 0.8660254037844386f),
+            new Angle(0.20833333333333331f, 0.25881904510252096f, 0.9659258262890682f),
+            new Angle(0.25f, 0.0f, 1.0f),
+            new Angle(0.29166666666666663f, -0.25881904510252063f, 0.96592582628906831f),
+            new Angle(0.33333333333333333f, -0.5f, 0.86602540378443871f),
+            new Angle(0.375f, -0.70710678118654746f, 0.70710678118654757f),
+            new Angle(0.41666666666666663f, -0.86602540378443849f, 0.5f),
+            new Angle(0.45833333333333331f, -0.9659258262890682f, 0.25881904510252102f),
+            new Angle(0.5f, -1.0f, 0.0f),
+            new Angle(0.54166666666666663f, -0.96592582628906842f, -0.25881904510252035f),
+            new Angle(0.58333333333333326f, -0.86602540378443882f, -0.5f),
+            new Angle(0.62499999999999989f, -0.70710678118654791f, -0.70710678118654713f),
+            new Angle(0.66666666666666667f, -0.5f, -0.86602540378443837f),
+            new Angle(0.70833333333333326f, -0.25881904510252152f, -0.96592582628906809f),
+            new Angle(0.75f, 0.0f, -1.0f),
+            new Angle(0.79166666666666663f, 0.2588190451025203f, -0.96592582628906842f),
+            new Angle(0.83333333333333326f, 0.5f, -0.86602540378443904f),
+            new Angle(0.875f, 0.70710678118654735f, -0.70710678118654768f),
+            new Angle(0.91666666666666663f, 0.86602540378443837f, -0.5f),
+            new Angle(0.95833333333333326f, 0.96592582628906809f, -0.25881904510252157f),
+            new Angle(1.0f, 1.0f, 0.0f)
+        };
+
+        private Angle interpolatePoints(float newPoint, Angle p1, Angle p2)
+        {
+            float m = (newPoint - p1.angle) / (p2.angle - p1.angle);
+            return new Angle(newPoint, p1.X + m * (p2.X - p1.X), p1.Y + m * (p2.Y - p1.Y));
+        }
+
+        private void intersection(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
+        { // ref: http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline2d/
+            double denom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1);
+            double uaNumerator = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3);
+
+            if (denom != 0.0)
+            {
+                double ua = uaNumerator / denom;
+                iX = (float)(x1 + ua * (x2 - x1));
+                iY = (float)(y1 + ua * (y2 - y1));
+            }
+        }
+
+        internal List<Angle> angles;
+        internal List<Coord> normals;
+
+        internal void makeAngles(int sides, float startAngle, float stopAngle)
+        {
+            angles = new List<Angle>();
+            normals = new List<Coord>();
+
+            double twoPi = System.Math.PI * 2.0;
+            float twoPiInv = 1.0f / (float)twoPi;
+
+            if (sides < 1)
+                throw new Exception("number of sides not greater than zero");
+            if (stopAngle <= startAngle)
+                throw new Exception("stopAngle not greater than startAngle");
+
+            if ((sides == 3 || sides == 4 || sides == 24))
+            {
+                startAngle *= twoPiInv;
+                stopAngle *= twoPiInv;
+
+                Angle[] sourceAngles;
+                if (sides == 3)
+                    sourceAngles = angles3;
+                else if (sides == 4)
+                    sourceAngles = angles4;
+                else sourceAngles = angles24;
+
+                int startAngleIndex = (int)(startAngle * sides);
+                int endAngleIndex = sourceAngles.Length - 1;
+                if (stopAngle < 1.0f)
+                    endAngleIndex = (int)(stopAngle * sides) + 1;
+                if (endAngleIndex == startAngleIndex)
+                    endAngleIndex++;
+
+                for (int angleIndex = startAngleIndex; angleIndex < endAngleIndex + 1; angleIndex++)
+                {
+                    angles.Add(sourceAngles[angleIndex]);
+                    if (sides == 3)
+                        normals.Add(normals3[angleIndex]);
+                    else if (sides == 4)
+                        normals.Add(normals4[angleIndex]);
+                }
+
+                if (startAngle > 0.0f)
+                    angles[0] = interpolatePoints(startAngle, angles[0], angles[1]);
+
+                if (stopAngle < 1.0f)
+                {
+                    int lastAngleIndex = angles.Count - 1;
+                    angles[lastAngleIndex] = interpolatePoints(stopAngle, angles[lastAngleIndex - 1], angles[lastAngleIndex]);
+                }
+            }
+            else
+            {
+                double stepSize = twoPi / sides;
+
+                int startStep = (int)(startAngle / stepSize);
+                double angle = stepSize * startStep;
+                int step = startStep;
+                double stopAngleTest = stopAngle;
+                if (stopAngle < twoPi)
+                {
+                    stopAngleTest = stepSize * ((int)(stopAngle / stepSize) + 1);
+                    if (stopAngleTest < stopAngle)
+                        stopAngleTest += stepSize;
+                    if (stopAngleTest > twoPi)
+                        stopAngleTest = twoPi;
+                }
+
+                while (angle <= stopAngleTest)
+                {
+                    Angle newAngle;
+                    newAngle.angle = (float)angle;
+                    newAngle.X = (float)System.Math.Cos(angle);
+                    newAngle.Y = (float)System.Math.Sin(angle);
+                    angles.Add(newAngle);
+                    step += 1;
+                    angle = stepSize * step;
+                }
+
+                if (startAngle > angles[0].angle)
+                {
+                    Angle newAngle;
+                    intersection(angles[0].X, angles[0].Y, angles[1].X, angles[1].Y, 0.0f, 0.0f, (float)Math.Cos(startAngle), (float)Math.Sin(startAngle));
+                    newAngle.angle = startAngle;
+                    newAngle.X = iX;
+                    newAngle.Y = iY;
+                    angles[0] = newAngle;
+                }
+
+                int index = angles.Count - 1;
+                if (stopAngle < angles[index].angle)
+                {
+                    Angle newAngle;
+                    intersection(angles[index - 1].X, angles[index - 1].Y, angles[index].X, angles[index].Y, 0.0f, 0.0f, (float)Math.Cos(stopAngle), (float)Math.Sin(stopAngle));
+                    newAngle.angle = stopAngle;
+                    newAngle.X = iX;
+                    newAngle.Y = iY;
+                    angles[index] = newAngle;
+                }
+            }
+        }
+    }
+
+    /// <summary>
+    /// generates a profile for extrusion
+    /// </summary>
+    internal class Profile
+    {
+        private const float twoPi = 2.0f * (float)Math.PI;
+
+        internal string errorMessage = null;
+
+        internal List<Coord> coords;
+        internal List<Face> faces;
+        internal List<Coord> vertexNormals;
+        internal List<float> us;
+        internal List<UVCoord> faceUVs;
+        internal List<int> faceNumbers;
+
+        // use these for making individual meshes for each prim face
+        internal List<int> outerCoordIndices = null;
+        internal List<int> hollowCoordIndices = null;
+        internal List<int> cut1CoordIndices = null;
+        internal List<int> cut2CoordIndices = null;
+
+        internal Coord faceNormal = new Coord(0.0f, 0.0f, 1.0f);
+        internal Coord cutNormal1 = new Coord();
+        internal Coord cutNormal2 = new Coord();
+
+        internal int numOuterVerts = 0;
+        internal int numHollowVerts = 0;
+
+        internal bool calcVertexNormals = false;
+        internal int bottomFaceNumber = 0;
+        internal int numPrimFaces = 0;
+
+        internal Profile()
+        {
+            this.coords = new List<Coord>();
+            this.faces = new List<Face>();
+            this.vertexNormals = new List<Coord>();
+            this.us = new List<float>();
+            this.faceUVs = new List<UVCoord>();
+            this.faceNumbers = new List<int>();
+        }
+
+        internal Profile(int sides, float profileStart, float profileEnd, float hollow, int hollowSides, bool createFaces, bool calcVertexNormals)
+        {
+            this.calcVertexNormals = calcVertexNormals;
+            this.coords = new List<Coord>();
+            this.faces = new List<Face>();
+            this.vertexNormals = new List<Coord>();
+            this.us = new List<float>();
+            this.faceUVs = new List<UVCoord>();
+            this.faceNumbers = new List<int>();
+
+            Coord center = new Coord(0.0f, 0.0f, 0.0f);
+            //bool hasCenter = false;
+
+            List<Coord> hollowCoords = new List<Coord>();
+            List<Coord> hollowNormals = new List<Coord>();
+            List<float> hollowUs = new List<float>();
+
+            if (calcVertexNormals)
+            {
+                this.outerCoordIndices = new List<int>();
+                this.hollowCoordIndices = new List<int>();
+                this.cut1CoordIndices = new List<int>();
+                this.cut2CoordIndices = new List<int>();
+            }
+
+            bool hasHollow = (hollow > 0.0f);
+
+            bool hasProfileCut = (profileStart > 0.0f || profileEnd < 1.0f);
+
+            AngleList angles = new AngleList();
+            AngleList hollowAngles = new AngleList();
+
+            float xScale = 0.5f;
+            float yScale = 0.5f;
+            if (sides == 4)  // corners of a square are sqrt(2) from center
+            {
+                xScale = 0.707f;
+                yScale = 0.707f;
+            }
+
+            float startAngle = profileStart * twoPi;
+            float stopAngle = profileEnd * twoPi;
+
+            try { angles.makeAngles(sides, startAngle, stopAngle); }
+            catch (Exception ex)
+            {
+
+                errorMessage = "makeAngles failed: Exception: " + ex.ToString()
+                + "\nsides: " + sides.ToString() + " startAngle: " + startAngle.ToString() + " stopAngle: " + stopAngle.ToString();
+
+                return;
+            }
+
+            this.numOuterVerts = angles.angles.Count;
+
+            // flag to create as few triangles as possible for 3 or 4 side profile
+            bool simpleFace = (sides < 5 && !hasHollow && !hasProfileCut);
+
+            if (hasHollow)
+            {
+                if (sides == hollowSides)
+                    hollowAngles = angles;
+                else
+                {
+                    try { hollowAngles.makeAngles(hollowSides, startAngle, stopAngle); }
+                    catch (Exception ex)
+                    {
+                        errorMessage = "makeAngles failed: Exception: " + ex.ToString()
+                        + "\nsides: " + sides.ToString() + " startAngle: " + startAngle.ToString() + " stopAngle: " + stopAngle.ToString();
+
+                        return;
+                    }
+                }
+                this.numHollowVerts = hollowAngles.angles.Count;
+            }
+            else if (!simpleFace)
+            {
+                this.coords.Add(center);
+                //hasCenter = true;
+                if (this.calcVertexNormals)
+                    this.vertexNormals.Add(new Coord(0.0f, 0.0f, 1.0f));
+                this.us.Add(0.0f);
+            }
+
+            float z = 0.0f;
+
+            Angle angle;
+            Coord newVert = new Coord();
+            if (hasHollow && hollowSides != sides)
+            {
+                int numHollowAngles = hollowAngles.angles.Count;
+                for (int i = 0; i < numHollowAngles; i++)
+                {
+                    angle = hollowAngles.angles[i];
+                    newVert.X = hollow * xScale * angle.X;
+                    newVert.Y = hollow * yScale * angle.Y;
+                    newVert.Z = z;
+
+                    hollowCoords.Add(newVert);
+                    if (this.calcVertexNormals)
+                    {
+                        if (hollowSides < 5)
+                            hollowNormals.Add(hollowAngles.normals[i].Invert());
+                        else
+                            hollowNormals.Add(new Coord(-angle.X, -angle.Y, 0.0f));
+
+                        hollowUs.Add(angle.angle * hollow);
+                    }
+                }
+            }
+
+            int index = 0;
+            int numAngles = angles.angles.Count;
+
+            for (int i = 0; i < numAngles; i++)
+            {
+                angle = angles.angles[i];
+                newVert.X = angle.X * xScale;
+                newVert.Y = angle.Y * yScale;
+                newVert.Z = z;
+                this.coords.Add(newVert);
+                if (this.calcVertexNormals)
+                {
+                    this.outerCoordIndices.Add(this.coords.Count - 1);
+
+                    if (sides < 5)
+                    {
+                        this.vertexNormals.Add(angles.normals[i]);
+                        float u = angle.angle;
+                        this.us.Add(u);
+                    }
+                    else
+                    {
+                        this.vertexNormals.Add(new Coord(angle.X, angle.Y, 0.0f));
+                        this.us.Add(angle.angle);
+                    }
+                }
+
+                if (hasHollow)
+                {
+                    if (hollowSides == sides)
+                    {
+                        newVert.X *= hollow;
+                        newVert.Y *= hollow;
+                        newVert.Z = z;
+                        hollowCoords.Add(newVert);
+                        if (this.calcVertexNormals)
+                        {
+                            if (sides < 5)
+                            {
+                                hollowNormals.Add(angles.normals[i].Invert());
+                            }
+
+                            else
+                                hollowNormals.Add(new Coord(-angle.X, -angle.Y, 0.0f));
+
+                            hollowUs.Add(angle.angle * hollow);
+                        }
+                    }
+                }
+                else if (!simpleFace && createFaces && angle.angle > 0.0001f)
+                {
+                    Face newFace = new Face();
+                    newFace.v1 = 0;
+                    newFace.v2 = index;
+                    newFace.v3 = index + 1;
+
+                    this.faces.Add(newFace);
+                }
+                index += 1;
+            }
+
+            if (hasHollow)
+            {
+                hollowCoords.Reverse();
+                if (this.calcVertexNormals)
+                {
+                    hollowNormals.Reverse();
+                    hollowUs.Reverse();
+                }
+
+                if (createFaces)
+                {
+                    //int numOuterVerts = this.coords.Count;
+                    //numOuterVerts = this.coords.Count;
+                    //int numHollowVerts = hollowCoords.Count;
+                    int numTotalVerts = this.numOuterVerts + this.numHollowVerts;
+
+                    if (this.numOuterVerts == this.numHollowVerts)
+                    {
+                        Face newFace = new Face();
+
+                        for (int coordIndex = 0; coordIndex < this.numOuterVerts - 1; coordIndex++)
+                        {
+                            newFace.v1 = coordIndex;
+                            newFace.v2 = coordIndex + 1;
+                            newFace.v3 = numTotalVerts - coordIndex - 1;
+                            this.faces.Add(newFace);
+
+                            newFace.v1 = coordIndex + 1;
+                            newFace.v2 = numTotalVerts - coordIndex - 2;
+                            newFace.v3 = numTotalVerts - coordIndex - 1;
+                            this.faces.Add(newFace);
+                        }
+                    }
+                    else
+                    {
+                        if (this.numOuterVerts < this.numHollowVerts)
+                        {
+                            Face newFace = new Face();
+                            int j = 0; // j is the index for outer vertices
+                            int maxJ = this.numOuterVerts - 1;
+                            for (int i = 0; i < this.numHollowVerts; i++) // i is the index for inner vertices
+                            {
+                                if (j < maxJ)
+                                    if (angles.angles[j + 1].angle - hollowAngles.angles[i].angle < hollowAngles.angles[i].angle - angles.angles[j].angle + 0.000001f)
+                                    {
+                                        newFace.v1 = numTotalVerts - i - 1;
+                                        newFace.v2 = j;
+                                        newFace.v3 = j + 1;
+
+                                        this.faces.Add(newFace);
+                                        j += 1;
+                                    }
+
+                                newFace.v1 = j;
+                                newFace.v2 = numTotalVerts - i - 2;
+                                newFace.v3 = numTotalVerts - i - 1;
+
+                                this.faces.Add(newFace);
+                            }
+                        }
+                        else // numHollowVerts < numOuterVerts
+                        {
+                            Face newFace = new Face();
+                            int j = 0; // j is the index for inner vertices
+                            int maxJ = this.numHollowVerts - 1;
+                            for (int i = 0; i < this.numOuterVerts; i++)
+                            {
+                                if (j < maxJ)
+                                    if (hollowAngles.angles[j + 1].angle - angles.angles[i].angle < angles.angles[i].angle - hollowAngles.angles[j].angle + 0.000001f)
+                                    {
+                                        newFace.v1 = i;
+                                        newFace.v2 = numTotalVerts - j - 2;
+                                        newFace.v3 = numTotalVerts - j - 1;
+
+                                        this.faces.Add(newFace);
+                                        j += 1;
+                                    }
+
+                                newFace.v1 = numTotalVerts - j - 1;
+                                newFace.v2 = i;
+                                newFace.v3 = i + 1;
+
+                                this.faces.Add(newFace);
+                            }
+                        }
+                    }
+                }
+
+                if (calcVertexNormals)
+                {
+                    foreach (Coord hc in hollowCoords)
+                    {
+                        this.coords.Add(hc);
+                        hollowCoordIndices.Add(this.coords.Count - 1);
+                    }
+                }
+                else
+                    this.coords.AddRange(hollowCoords);
+
+                if (this.calcVertexNormals)
+                {
+                    this.vertexNormals.AddRange(hollowNormals);
+                    this.us.AddRange(hollowUs);
+
+                }
+            }
+
+            if (simpleFace && createFaces)
+            {
+                if (sides == 3)
+                    this.faces.Add(new Face(0, 1, 2));
+                else if (sides == 4)
+                {
+                    this.faces.Add(new Face(0, 1, 2));
+                    this.faces.Add(new Face(0, 2, 3));
+                }
+            }
+
+            if (calcVertexNormals && hasProfileCut)
+            {
+                if (hasHollow)
+                {
+                    int lastOuterVertIndex = this.numOuterVerts - 1;
+
+                    this.cut1CoordIndices.Add(0);
+                    this.cut1CoordIndices.Add(this.coords.Count - 1);
+
+                    this.cut2CoordIndices.Add(lastOuterVertIndex + 1);
+                    this.cut2CoordIndices.Add(lastOuterVertIndex);
+
+                    this.cutNormal1.X = this.coords[0].Y - this.coords[this.coords.Count - 1].Y;
+                    this.cutNormal1.Y = -(this.coords[0].X - this.coords[this.coords.Count - 1].X);
+
+                    this.cutNormal2.X = this.coords[lastOuterVertIndex + 1].Y - this.coords[lastOuterVertIndex].Y;
+                    this.cutNormal2.Y = -(this.coords[lastOuterVertIndex + 1].X - this.coords[lastOuterVertIndex].X);
+                }
+
+                else
+                {
+                    this.cutNormal1.X = this.vertexNormals[1].Y;
+                    this.cutNormal1.Y = -this.vertexNormals[1].X;
+
+                    this.cutNormal2.X = -this.vertexNormals[this.vertexNormals.Count - 2].Y;
+                    this.cutNormal2.Y = this.vertexNormals[this.vertexNormals.Count - 2].X;
+
+                }
+                this.cutNormal1.Normalize();
+                this.cutNormal2.Normalize();
+            }
+
+            this.MakeFaceUVs();
+
+            hollowCoords = null;
+            hollowNormals = null;
+            hollowUs = null;
+
+            if (calcVertexNormals)
+            { // calculate prim face numbers
+
+                // face number order is top, outer, hollow, bottom, start cut, end cut
+                // I know it's ugly but so is the whole concept of prim face numbers
+
+                int faceNum = 1; // start with outer faces
+                int startVert = hasProfileCut && !hasHollow ? 1 : 0;
+                if (startVert > 0)
+                    this.faceNumbers.Add(-1);
+                for (int i = 0; i < this.numOuterVerts - 1; i++)
+                    this.faceNumbers.Add(sides < 5 ? faceNum++ : faceNum);
+
+                //if (!hasHollow && !hasProfileCut)
+                //    this.bottomFaceNumber = faceNum++;
+
+                this.faceNumbers.Add(hasProfileCut ? -1 : faceNum++);
+
+                if (sides > 4 && (hasHollow || hasProfileCut))
+                    faceNum++;
+
+                if (hasHollow)
+                {
+                    for (int i = 0; i < this.numHollowVerts; i++)
+                        this.faceNumbers.Add(faceNum);
+
+                    faceNum++;
+                }
+                //if (hasProfileCut || hasHollow)
+                //    this.bottomFaceNumber = faceNum++;
+                this.bottomFaceNumber = faceNum++;
+
+                if (hasHollow && hasProfileCut)
+                    this.faceNumbers.Add(faceNum++);
+                for (int i = 0; i < this.faceNumbers.Count; i++)
+                    if (this.faceNumbers[i] == -1)
+                        this.faceNumbers[i] = faceNum++;
+
+
+                this.numPrimFaces = faceNum;
+            }
+
+        }
+
+        internal void MakeFaceUVs()
+        {
+            this.faceUVs = new List<UVCoord>();
+            foreach (Coord c in this.coords)
+                this.faceUVs.Add(new UVCoord(0.5f + c.X, 0.5f - c.Y));
+        }
+
+        internal Profile Copy()
+        {
+            return this.Copy(true);
+        }
+
+        internal Profile Copy(bool needFaces)
+        {
+            Profile copy = new Profile();
+
+            copy.coords.AddRange(this.coords);
+            copy.faceUVs.AddRange(this.faceUVs);
+
+            if (needFaces)
+                copy.faces.AddRange(this.faces);
+            if ((copy.calcVertexNormals = this.calcVertexNormals) == true)
+            {
+                copy.vertexNormals.AddRange(this.vertexNormals);
+                copy.faceNormal = this.faceNormal;
+                copy.cutNormal1 = this.cutNormal1;
+                copy.cutNormal2 = this.cutNormal2;
+                copy.us.AddRange(this.us);
+                copy.faceNumbers.AddRange(this.faceNumbers);
+
+                copy.cut1CoordIndices = new List<int>(this.cut1CoordIndices);
+                copy.cut2CoordIndices = new List<int>(this.cut2CoordIndices);
+                copy.hollowCoordIndices = new List<int>(this.hollowCoordIndices);
+                copy.outerCoordIndices = new List<int>(this.outerCoordIndices);
+            }
+            copy.numOuterVerts = this.numOuterVerts;
+            copy.numHollowVerts = this.numHollowVerts;
+
+            return copy;
+        }
+
+        internal void AddPos(Coord v)
+        {
+            this.AddPos(v.X, v.Y, v.Z);
+        }
+
+        internal void AddPos(float x, float y, float z)
+        {
+            int i;
+            int numVerts = this.coords.Count;
+            Coord vert;
+
+            for (i = 0; i < numVerts; i++)
+            {
+                vert = this.coords[i];
+                vert.X += x;
+                vert.Y += y;
+                vert.Z += z;
+                this.coords[i] = vert;
+            }
+        }
+
+        internal void AddRot(Quat q)
+        {
+            int i;
+            int numVerts = this.coords.Count;
+
+            for (i = 0; i < numVerts; i++)
+                this.coords[i] *= q;
+
+            if (this.calcVertexNormals)
+            {
+                int numNormals = this.vertexNormals.Count;
+                for (i = 0; i < numNormals; i++)
+                    this.vertexNormals[i] *= q;
+
+                this.faceNormal *= q;
+                this.cutNormal1 *= q;
+                this.cutNormal2 *= q;
+
+            }
+        }
+
+        internal void Scale(float x, float y)
+        {
+            int i;
+            int numVerts = this.coords.Count;
+            Coord vert;
+
+            for (i = 0; i < numVerts; i++)
+            {
+                vert = this.coords[i];
+                vert.X *= x;
+                vert.Y *= y;
+                this.coords[i] = vert;
+            }
+        }
+
+        /// <summary>
+        /// Changes order of the vertex indices and negates the center vertex normal. Does not alter vertex normals of radial vertices
+        /// </summary>
+        internal void FlipNormals()
+        {
+            int i;
+            int numFaces = this.faces.Count;
+            Face tmpFace;
+            int tmp;
+
+            for (i = 0; i < numFaces; i++)
+            {
+                tmpFace = this.faces[i];
+                tmp = tmpFace.v3;
+                tmpFace.v3 = tmpFace.v1;
+                tmpFace.v1 = tmp;
+                this.faces[i] = tmpFace;
+            }
+
+            if (this.calcVertexNormals)
+            {
+                int normalCount = this.vertexNormals.Count;
+                if (normalCount > 0)
+                {
+                    Coord n = this.vertexNormals[normalCount - 1];
+                    n.Z = -n.Z;
+                    this.vertexNormals[normalCount - 1] = n;
+                }
+            }
+
+            this.faceNormal.X = -this.faceNormal.X;
+            this.faceNormal.Y = -this.faceNormal.Y;
+            this.faceNormal.Z = -this.faceNormal.Z;
+
+            int numfaceUVs = this.faceUVs.Count;
+            for (i = 0; i < numfaceUVs; i++)
+            {
+                UVCoord uv = this.faceUVs[i];
+                uv.V = 1.0f - uv.V;
+                this.faceUVs[i] = uv;
+            }
+        }
+
+        internal void AddValue2FaceVertexIndices(int num)
+        {
+            int numFaces = this.faces.Count;
+            Face tmpFace;
+            for (int i = 0; i < numFaces; i++)
+            {
+                tmpFace = this.faces[i];
+                tmpFace.v1 += num;
+                tmpFace.v2 += num;
+                tmpFace.v3 += num;
+
+                this.faces[i] = tmpFace;
+            }
+        }
+
+        internal void AddValue2FaceNormalIndices(int num)
+        {
+            if (this.calcVertexNormals)
+            {
+                int numFaces = this.faces.Count;
+                Face tmpFace;
+                for (int i = 0; i < numFaces; i++)
+                {
+                    tmpFace = this.faces[i];
+                    tmpFace.n1 += num;
+                    tmpFace.n2 += num;
+                    tmpFace.n3 += num;
+
+                    this.faces[i] = tmpFace;
+                }
+            }
+        }
+
+        internal void DumpRaw(String path, String name, String title)
+        {
+            if (path == null)
+                return;
+            String fileName = name + "_" + title + ".raw";
+            String completePath = System.IO.Path.Combine(path, fileName);
+            StreamWriter sw = new StreamWriter(completePath);
+
+            for (int i = 0; i < this.faces.Count; i++)
+            {
+                string s = this.coords[this.faces[i].v1].ToString();
+                s += " " + this.coords[this.faces[i].v2].ToString();
+                s += " " + this.coords[this.faces[i].v3].ToString();
+
+                sw.WriteLine(s);
+            }
+
+            sw.Close();
+        }
+    }
+
+    public struct PathNode
+    {
+        public Coord position;
+        public Quat rotation;
+        public float xScale;
+        public float yScale;
+        public float percentOfPath;
+    }
+
+    public enum PathType { Linear = 0, Circular = 1, Flexible = 2 }
+
+    public class Path
+    {
+        public List<PathNode> pathNodes = new List<PathNode>();
+
+        public float twistBegin = 0.0f;
+        public float twistEnd = 0.0f;
+        public float topShearX = 0.0f;
+        public float topShearY = 0.0f;
+        public float pathCutBegin = 0.0f;
+        public float pathCutEnd = 1.0f;
+        public float dimpleBegin = 0.0f;
+        public float dimpleEnd = 1.0f;
+        public float skew = 0.0f;
+        public float holeSizeX = 1.0f; // called pathScaleX in pbs
+        public float holeSizeY = 0.25f;
+        public float taperX = 0.0f;
+        public float taperY = 0.0f;
+        public float radius = 0.0f;
+        public float revolutions = 1.0f;
+        public int stepsPerRevolution = 24;
+
+        private const float twoPi = 2.0f * (float)Math.PI;
+
+        public void Create(PathType pathType, int steps)
+        {
+            if (pathType == PathType.Linear || pathType == PathType.Flexible)
+            {
+                int step = 0;
+
+                float length = this.pathCutEnd - this.pathCutBegin;
+                float twistTotal = twistEnd - twistBegin;
+                float twistTotalAbs = Math.Abs(twistTotal);
+                if (twistTotalAbs > 0.01f)
+                    steps += (int)(twistTotalAbs * 3.66); //  dahlia's magic number
+
+                float start = -0.5f;
+                float stepSize = length / (float)steps;
+                float percentOfPathMultiplier = stepSize;
+                float xOffset = 0.0f;
+                float yOffset = 0.0f;
+                float zOffset = start;
+                float xOffsetStepIncrement = this.topShearX / steps;
+                float yOffsetStepIncrement = this.topShearY / steps;
+
+                float percentOfPath = this.pathCutBegin;
+                zOffset += percentOfPath;
+
+                // sanity checks
+
+                bool done = false;
+
+                while (!done)
+                {
+                    PathNode newNode = new PathNode();
+
+                    newNode.xScale = 1.0f;
+                    if (this.taperX == 0.0f)
+                        newNode.xScale = 1.0f;
+                    else if (this.taperX > 0.0f)
+                        newNode.xScale = 1.0f - percentOfPath * this.taperX;
+                    else newNode.xScale = 1.0f + (1.0f - percentOfPath) * this.taperX;
+
+                    newNode.yScale = 1.0f;
+                    if (this.taperY == 0.0f)
+                        newNode.yScale = 1.0f;
+                    else if (this.taperY > 0.0f)
+                        newNode.yScale = 1.0f - percentOfPath * this.taperY;
+                    else newNode.yScale = 1.0f + (1.0f - percentOfPath) * this.taperY;
+
+                    float twist = twistBegin + twistTotal * percentOfPath;
+
+                    newNode.rotation = new Quat(new Coord(0.0f, 0.0f, 1.0f), twist);
+                    newNode.position = new Coord(xOffset, yOffset, zOffset);
+                    newNode.percentOfPath = percentOfPath;
+
+                    pathNodes.Add(newNode);
+
+                    if (step < steps)
+                    {
+                        step += 1;
+                        percentOfPath += percentOfPathMultiplier;
+                        xOffset += xOffsetStepIncrement;
+                        yOffset += yOffsetStepIncrement;
+                        zOffset += stepSize;
+                        if (percentOfPath > this.pathCutEnd)
+                            done = true;
+                    }
+                    else done = true;
+                }
+            } // end of linear path code
+
+            else // pathType == Circular
+            {
+                float twistTotal = twistEnd - twistBegin;
+
+                // if the profile has a lot of twist, add more layers otherwise the layers may overlap
+                // and the resulting mesh may be quite inaccurate. This method is arbitrary and doesn't
+                // accurately match the viewer
+                float twistTotalAbs = Math.Abs(twistTotal);
+                if (twistTotalAbs > 0.01f)
+                {
+                    if (twistTotalAbs > Math.PI * 1.5f)
+                        steps *= 2;
+                    if (twistTotalAbs > Math.PI * 3.0f)
+                        steps *= 2;
+                }
+
+                float yPathScale = this.holeSizeY * 0.5f;
+                float pathLength = this.pathCutEnd - this.pathCutBegin;
+                float totalSkew = this.skew * 2.0f * pathLength;
+                float skewStart = this.pathCutBegin * 2.0f * this.skew - this.skew;
+                float xOffsetTopShearXFactor = this.topShearX * (0.25f + 0.5f * (0.5f - this.holeSizeY));
+                float yShearCompensation = 1.0f + Math.Abs(this.topShearY) * 0.25f;
+
+                // It's not quite clear what pushY (Y top shear) does, but subtracting it from the start and end
+                // angles appears to approximate it's effects on path cut. Likewise, adding it to the angle used
+                // to calculate the sine for generating the path radius appears to approximate it's effects there
+                // too, but there are some subtle differences in the radius which are noticeable as the prim size
+                // increases and it may affect megaprims quite a bit. The effect of the Y top shear parameter on
+                // the meshes generated with this technique appear nearly identical in shape to the same prims when
+                // displayed by the viewer.
+
+                float startAngle = (twoPi * this.pathCutBegin * this.revolutions) - this.topShearY * 0.9f;
+                float endAngle = (twoPi * this.pathCutEnd * this.revolutions) - this.topShearY * 0.9f;
+                float stepSize = twoPi / this.stepsPerRevolution;
+
+                int step = (int)(startAngle / stepSize);
+                float angle = startAngle;
+
+                bool done = false;
+                while (!done) // loop through the length of the path and add the layers
+                {
+                    PathNode newNode = new PathNode();
+
+                    float xProfileScale = (1.0f - Math.Abs(this.skew)) * this.holeSizeX;
+                    float yProfileScale = this.holeSizeY;
+
+                    float percentOfPath = angle / (twoPi * this.revolutions);
+                    float percentOfAngles = (angle - startAngle) / (endAngle - startAngle);
+
+                    if (this.taperX > 0.01f)
+                        xProfileScale *= 1.0f - percentOfPath * this.taperX;
+                    else if (this.taperX < -0.01f)
+                        xProfileScale *= 1.0f + (1.0f - percentOfPath) * this.taperX;
+
+                    if (this.taperY > 0.01f)
+                        yProfileScale *= 1.0f - percentOfPath * this.taperY;
+                    else if (this.taperY < -0.01f)
+                        yProfileScale *= 1.0f + (1.0f - percentOfPath) * this.taperY;
+
+                    newNode.xScale = xProfileScale;
+                    newNode.yScale = yProfileScale;
+
+                    float radiusScale = 1.0f;
+                    if (this.radius > 0.001f)
+                        radiusScale = 1.0f - this.radius * percentOfPath;
+                    else if (this.radius < 0.001f)
+                        radiusScale = 1.0f + this.radius * (1.0f - percentOfPath);
+
+                    float twist = twistBegin + twistTotal * percentOfPath;
+
+                    float xOffset = 0.5f * (skewStart + totalSkew * percentOfAngles);
+                    xOffset += (float)Math.Sin(angle) * xOffsetTopShearXFactor;
+
+                    float yOffset = yShearCompensation * (float)Math.Cos(angle) * (0.5f - yPathScale) * radiusScale;
+
+                    float zOffset = (float)Math.Sin(angle + this.topShearY) * (0.5f - yPathScale) * radiusScale;
+
+                    newNode.position = new Coord(xOffset, yOffset, zOffset);
+
+                    // now orient the rotation of the profile layer relative to it's position on the path
+                    // adding taperY to the angle used to generate the quat appears to approximate the viewer
+
+                    newNode.rotation = new Quat(new Coord(1.0f, 0.0f, 0.0f), angle + this.topShearY);
+
+                    // next apply twist rotation to the profile layer
+                    if (twistTotal != 0.0f || twistBegin != 0.0f)
+                        newNode.rotation *= new Quat(new Coord(0.0f, 0.0f, 1.0f), twist);
+
+                    newNode.percentOfPath = percentOfPath;
+
+                    pathNodes.Add(newNode);
+
+                    // calculate terms for next iteration
+                    // calculate the angle for the next iteration of the loop
+
+                    if (angle >= endAngle - 0.01)
+                        done = true;
+                    else
+                    {
+                        step += 1;
+                        angle = stepSize * step;
+                        if (angle > endAngle)
+                            angle = endAngle;
+                    }
+                }
+            }
+        }
+    }
+
+    public class PrimMesh
+    {
+        public string errorMessage = "";
+        private const float twoPi = 2.0f * (float)Math.PI;
+
+        public List<Coord> coords;
+        public List<Coord> normals;
+        public List<Face> faces;
+
+        public List<ViewerFace> viewerFaces;
+
+        private int sides = 4;
+        private int hollowSides = 4;
+        private float profileStart = 0.0f;
+        private float profileEnd = 1.0f;
+        private float hollow = 0.0f;
+        public int twistBegin = 0;
+        public int twistEnd = 0;
+        public float topShearX = 0.0f;
+        public float topShearY = 0.0f;
+        public float pathCutBegin = 0.0f;
+        public float pathCutEnd = 1.0f;
+        public float dimpleBegin = 0.0f;
+        public float dimpleEnd = 1.0f;
+        public float skew = 0.0f;
+        public float holeSizeX = 1.0f; // called pathScaleX in pbs
+        public float holeSizeY = 0.25f;
+        public float taperX = 0.0f;
+        public float taperY = 0.0f;
+        public float radius = 0.0f;
+        public float revolutions = 1.0f;
+        public int stepsPerRevolution = 24;
+
+        private bool hasProfileCut = false;
+        private bool hasHollow = false;
+        public bool calcVertexNormals = false;
+        private bool normalsProcessed = false;
+        public bool viewerMode = false;
+
+        public int numPrimFaces = 0;
+
+        /// <summary>
+        /// Human readable string representation of the parameters used to create a mesh.
+        /// </summary>
+        /// <returns></returns>
+        public string ParamsToDisplayString()
+        {
+            string s = "";
+            s += "sides..................: " + this.sides.ToString();
+            s += "\nhollowSides..........: " + this.hollowSides.ToString();
+            s += "\nprofileStart.........: " + this.profileStart.ToString();
+            s += "\nprofileEnd...........: " + this.profileEnd.ToString();
+            s += "\nhollow...............: " + this.hollow.ToString();
+            s += "\ntwistBegin...........: " + this.twistBegin.ToString();
+            s += "\ntwistEnd.............: " + this.twistEnd.ToString();
+            s += "\ntopShearX............: " + this.topShearX.ToString();
+            s += "\ntopShearY............: " + this.topShearY.ToString();
+            s += "\npathCutBegin.........: " + this.pathCutBegin.ToString();
+            s += "\npathCutEnd...........: " + this.pathCutEnd.ToString();
+            s += "\ndimpleBegin..........: " + this.dimpleBegin.ToString();
+            s += "\ndimpleEnd............: " + this.dimpleEnd.ToString();
+            s += "\nskew.................: " + this.skew.ToString();
+            s += "\nholeSizeX............: " + this.holeSizeX.ToString();
+            s += "\nholeSizeY............: " + this.holeSizeY.ToString();
+            s += "\ntaperX...............: " + this.taperX.ToString();
+            s += "\ntaperY...............: " + this.taperY.ToString();
+            s += "\nradius...............: " + this.radius.ToString();
+            s += "\nrevolutions..........: " + this.revolutions.ToString();
+            s += "\nstepsPerRevolution...: " + this.stepsPerRevolution.ToString();
+
+            return s;
+        }
+
+        /// <summary>
+        /// Constructs a PrimMesh object and creates the profile for extrusion.
+        /// </summary>
+        /// <param name="sides"></param>
+        /// <param name="profileStart"></param>
+        /// <param name="profileEnd"></param>
+        /// <param name="hollow"></param>
+        /// <param name="hollowSides"></param>
+        public PrimMesh(int sides, float profileStart, float profileEnd, float hollow, int hollowSides)
+        {
+            this.coords = new List<Coord>();
+            this.faces = new List<Face>();
+
+            this.sides = sides;
+            this.profileStart = profileStart;
+            this.profileEnd = profileEnd;
+            this.hollow = hollow;
+            this.hollowSides = hollowSides;
+
+            if (sides < 3)
+                this.sides = 3;
+            if (hollowSides < 3)
+                this.hollowSides = 3;
+            if (profileStart < 0.0f)
+                this.profileStart = 0.0f;
+            if (profileEnd > 1.0f)
+                this.profileEnd = 1.0f;
+            if (profileEnd < 0.02f)
+                this.profileEnd = 0.02f;
+            if (profileStart >= profileEnd)
+                this.profileStart = profileEnd - 0.02f;
+            if (hollow > 0.99f)
+                this.hollow = 0.99f;
+            if (hollow < 0.0f)
+                this.hollow = 0.0f;
+
+            this.hasProfileCut = (this.profileStart > 0.0f || this.profileEnd < 1.0f);
+            this.hasHollow = (this.hollow > 0.001f);
+        }
+
+        /// <summary>
+        /// Extrudes a profile along a path.
+        /// </summary>
+        public void Extrude(PathType pathType)
+        {
+            this.coords = new List<Coord>();
+            this.faces = new List<Face>();
+
+            if (this.viewerMode)
+            {
+                this.viewerFaces = new List<ViewerFace>();
+                this.calcVertexNormals = true;
+            }
+
+            if (this.calcVertexNormals)
+                this.normals = new List<Coord>();
+
+            int steps = 1;
+
+            float length = this.pathCutEnd - this.pathCutBegin;
+            normalsProcessed = false;
+
+            if (this.viewerMode && this.sides == 3)
+            {
+                // prisms don't taper well so add some vertical resolution
+                // other prims may benefit from this but just do prisms for now
+                if (Math.Abs(this.taperX) > 0.01 || Math.Abs(this.taperY) > 0.01)
+                    steps = (int)(steps * 4.5 * length);
+            }
+
+
+            float twistBegin = this.twistBegin / 360.0f * twoPi;
+            float twistEnd = this.twistEnd / 360.0f * twoPi;
+            float twistTotal = twistEnd - twistBegin;
+            float twistTotalAbs = Math.Abs(twistTotal);
+            if (twistTotalAbs > 0.01f)
+                steps += (int)(twistTotalAbs * 3.66); //  dahlia's magic number
+
+            float hollow = this.hollow;
+
+            // sanity checks
+            float initialProfileRot = 0.0f;
+            if (pathType == PathType.Circular)
+            {
+                if (this.sides == 3)
+                {
+                    initialProfileRot = (float)Math.PI;
+                    if (this.hollowSides == 4)
+                    {
+                        if (hollow > 0.7f)
+                            hollow = 0.7f;
+                        hollow *= 0.707f;
+                    }
+                    else hollow *= 0.5f;
+                }
+                else if (this.sides == 4)
+                {
+                    initialProfileRot = 0.25f * (float)Math.PI;
+                    if (this.hollowSides != 4)
+                        hollow *= 0.707f;
+                }
+                else if (this.sides > 4)
+                {
+                    initialProfileRot = (float)Math.PI;
+                    if (this.hollowSides == 4)
+                    {
+                        if (hollow > 0.7f)
+                            hollow = 0.7f;
+                        hollow /= 0.7f;
+                    }
+                }
+            }
+            else
+            {
+                if (this.sides == 3)
+                {
+                    if (this.hollowSides == 4)
+                    {
+                        if (hollow > 0.7f)
+                            hollow = 0.7f;
+                        hollow *= 0.707f;
+                    }
+                    else hollow *= 0.5f;
+                }
+                else if (this.sides == 4)
+                {
+                    initialProfileRot = 1.25f * (float)Math.PI;
+                    if (this.hollowSides != 4)
+                        hollow *= 0.707f;
+                }
+                else if (this.sides == 24 && this.hollowSides == 4)
+                    hollow *= 1.414f;
+            }
+
+            Profile profile = new Profile(this.sides, this.profileStart, this.profileEnd, hollow, this.hollowSides, true, calcVertexNormals);
+            this.errorMessage = profile.errorMessage;
+
+            this.numPrimFaces = profile.numPrimFaces;
+
+            int cut1Vert = -1;
+            int cut2Vert = -1;
+            if (hasProfileCut)
+            {
+                cut1Vert = hasHollow ? profile.coords.Count - 1 : 0;
+                cut2Vert = hasHollow ? profile.numOuterVerts - 1 : profile.numOuterVerts;
+            }
+
+            if (initialProfileRot != 0.0f)
+            {
+                profile.AddRot(new Quat(new Coord(0.0f, 0.0f, 1.0f), initialProfileRot));
+                if (viewerMode)
+                    profile.MakeFaceUVs();
+            }
+
+            Coord lastCutNormal1 = new Coord();
+            Coord lastCutNormal2 = new Coord();
+            float lastV = 1.0f;
+
+            Path path = new Path();
+            path.twistBegin = twistBegin;
+            path.twistEnd = twistEnd;
+            path.topShearX = topShearX;
+            path.topShearY = topShearY;
+            path.pathCutBegin = pathCutBegin;
+            path.pathCutEnd = pathCutEnd;
+            path.dimpleBegin = dimpleBegin;
+            path.dimpleEnd = dimpleEnd;
+            path.skew = skew;
+            path.holeSizeX = holeSizeX;
+            path.holeSizeY = holeSizeY;
+            path.taperX = taperX;
+            path.taperY = taperY;
+            path.radius = radius;
+            path.revolutions = revolutions;
+            path.stepsPerRevolution = stepsPerRevolution;
+
+            path.Create(pathType, steps);
+
+            bool needEndFaces = false;
+            if (pathType == PathType.Circular)
+            {
+                needEndFaces = false;
+                if (this.pathCutBegin != 0.0f || this.pathCutEnd != 1.0f)
+                    needEndFaces = true;
+                else if (this.taperX != 0.0f || this.taperY != 0.0f)
+                    needEndFaces = true;
+                else if (this.skew != 0.0f)
+                    needEndFaces = true;
+                else if (twistTotal != 0.0f)
+                    needEndFaces = true;
+                else if (this.radius != 0.0f)
+                    needEndFaces = true;
+            }
+            else needEndFaces = true;
+
+            for (int nodeIndex = 0; nodeIndex < path.pathNodes.Count; nodeIndex++)
+            {
+                PathNode node = path.pathNodes[nodeIndex];
+                Profile newLayer = profile.Copy();
+                newLayer.Scale(node.xScale, node.yScale);
+
+                newLayer.AddRot(node.rotation);
+                newLayer.AddPos(node.position);
+
+                if (needEndFaces && nodeIndex == 0)
+                {
+                    newLayer.FlipNormals();
+
+                    // add the top faces to the viewerFaces list here
+                    if (this.viewerMode)
+                    {
+                        Coord faceNormal = newLayer.faceNormal;
+                        ViewerFace newViewerFace = new ViewerFace(profile.bottomFaceNumber);
+                        int numFaces = newLayer.faces.Count;
+                        List<Face> faces = newLayer.faces;
+
+                        for (int i = 0; i < numFaces; i++)
+                        {
+                            Face face = faces[i];
+                            newViewerFace.v1 = newLayer.coords[face.v1];
+                            newViewerFace.v2 = newLayer.coords[face.v2];
+                            newViewerFace.v3 = newLayer.coords[face.v3];
+
+                            newViewerFace.coordIndex1 = face.v1;
+                            newViewerFace.coordIndex2 = face.v2;
+                            newViewerFace.coordIndex3 = face.v3;
+
+                            newViewerFace.n1 = faceNormal;
+                            newViewerFace.n2 = faceNormal;
+                            newViewerFace.n3 = faceNormal;
+
+                            newViewerFace.uv1 = newLayer.faceUVs[face.v1];
+                            newViewerFace.uv2 = newLayer.faceUVs[face.v2];
+                            newViewerFace.uv3 = newLayer.faceUVs[face.v3];
+
+                            this.viewerFaces.Add(newViewerFace);
+                        }
+                    }
+                } // if (nodeIndex == 0)
+
+                // append this layer
+
+                int coordsLen = this.coords.Count;
+                newLayer.AddValue2FaceVertexIndices(coordsLen);
+
+                this.coords.AddRange(newLayer.coords);
+
+                if (this.calcVertexNormals)
+                {
+                    newLayer.AddValue2FaceNormalIndices(this.normals.Count);
+                    this.normals.AddRange(newLayer.vertexNormals);
+                }
+
+                if (node.percentOfPath < this.pathCutBegin + 0.01f || node.percentOfPath > this.pathCutEnd - 0.01f)
+                    this.faces.AddRange(newLayer.faces);
+
+                // fill faces between layers
+
+                int numVerts = newLayer.coords.Count;
+                Face newFace = new Face();
+
+                if (nodeIndex > 0)
+                {
+                    int startVert = coordsLen + 1;
+                    int endVert = this.coords.Count;
+
+                    if (sides < 5 || this.hasProfileCut || hollow > 0.0f)
+                        startVert--;
+
+                    for (int i = startVert; i < endVert; i++)
+                    {
+                        int iNext = i + 1;
+                        if (i == endVert - 1)
+                            iNext = startVert;
+
+                        int whichVert = i - startVert;
+
+                        newFace.v1 = i;
+                        newFace.v2 = i - numVerts;
+                        newFace.v3 = iNext - numVerts;
+                        this.faces.Add(newFace);
+
+                        newFace.v2 = iNext - numVerts;
+                        newFace.v3 = iNext;
+                        this.faces.Add(newFace);
+
+                        if (this.viewerMode)
+                        {
+                            // add the side faces to the list of viewerFaces here
+
+                            int primFaceNum = profile.faceNumbers[whichVert];
+                            if (!needEndFaces)
+                                primFaceNum -= 1;
+
+                            ViewerFace newViewerFace1 = new ViewerFace(primFaceNum);
+                            ViewerFace newViewerFace2 = new ViewerFace(primFaceNum);
+
+                            float u1 = newLayer.us[whichVert];
+                            float u2 = 1.0f;
+                            if (whichVert < newLayer.us.Count - 1)
+                                u2 = newLayer.us[whichVert + 1];
+
+                            if (whichVert == cut1Vert || whichVert == cut2Vert)
+                            {
+                                u1 = 0.0f;
+                                u2 = 1.0f;
+                            }
+                            else if (sides < 5)
+                            {
+                                if (whichVert < profile.numOuterVerts)
+                                { // boxes and prisms have one texture face per side of the prim, so the U values have to be scaled
+                                    // to reflect the entire texture width
+                                    u1 *= sides;
+                                    u2 *= sides;
+                                    u2 -= (int)u1;
+                                    u1 -= (int)u1;
+                                    if (u2 < 0.1f)
+                                        u2 = 1.0f;
+                                }
+                                else if (whichVert > profile.coords.Count - profile.numHollowVerts - 1)
+                                {
+                                    u1 *= 2.0f;
+                                    u2 *= 2.0f;
+                                }
+                            }
+
+                            newViewerFace1.uv1.U = u1;
+                            newViewerFace1.uv2.U = u1;
+                            newViewerFace1.uv3.U = u2;
+
+                            newViewerFace1.uv1.V = 1.0f - node.percentOfPath;
+                            newViewerFace1.uv2.V = lastV;
+                            newViewerFace1.uv3.V = lastV;
+
+                            newViewerFace2.uv1.U = u1;
+                            newViewerFace2.uv2.U = u2;
+                            newViewerFace2.uv3.U = u2;
+
+                            newViewerFace2.uv1.V = 1.0f - node.percentOfPath;
+                            newViewerFace2.uv2.V = lastV;
+                            newViewerFace2.uv3.V = 1.0f - node.percentOfPath;
+
+                            newViewerFace1.v1 = this.coords[i];
+                            newViewerFace1.v2 = this.coords[i - numVerts];
+                            newViewerFace1.v3 = this.coords[iNext - numVerts];
+
+                            newViewerFace2.v1 = this.coords[i];
+                            newViewerFace2.v2 = this.coords[iNext - numVerts];
+                            newViewerFace2.v3 = this.coords[iNext];
+
+                            newViewerFace1.coordIndex1 = i;
+                            newViewerFace1.coordIndex2 = i - numVerts;
+                            newViewerFace1.coordIndex3 = iNext - numVerts;
+
+                            newViewerFace2.coordIndex1 = i;
+                            newViewerFace2.coordIndex2 = iNext - numVerts;
+                            newViewerFace2.coordIndex3 = iNext;
+
+                            // profile cut faces
+                            if (whichVert == cut1Vert)
+                            {
+                                newViewerFace1.n1 = newLayer.cutNormal1;
+                                newViewerFace1.n2 = newViewerFace1.n3 = lastCutNormal1;
+
+                                newViewerFace2.n1 = newViewerFace2.n3 = newLayer.cutNormal1;
+                                newViewerFace2.n2 = lastCutNormal1;
+                            }
+                            else if (whichVert == cut2Vert)
+                            {
+                                newViewerFace1.n1 = newLayer.cutNormal2;
+                                newViewerFace1.n2 = newViewerFace1.n3 = lastCutNormal2;
+
+                                newViewerFace2.n1 = newViewerFace2.n3 = newLayer.cutNormal2;
+                                newViewerFace2.n2 = lastCutNormal2;
+                            }
+
+                            else // outer and hollow faces
+                            {
+                                if ((sides < 5 && whichVert < newLayer.numOuterVerts) || (hollowSides < 5 && whichVert >= newLayer.numOuterVerts))
+                                { // looks terrible when path is twisted... need vertex normals here
+                                    newViewerFace1.CalcSurfaceNormal();
+                                    newViewerFace2.CalcSurfaceNormal();
+                                }
+                                else
+                                {
+                                    newViewerFace1.n1 = this.normals[i];
+                                    newViewerFace1.n2 = this.normals[i - numVerts];
+                                    newViewerFace1.n3 = this.normals[iNext - numVerts];
+
+                                    newViewerFace2.n1 = this.normals[i];
+                                    newViewerFace2.n2 = this.normals[iNext - numVerts];
+                                    newViewerFace2.n3 = this.normals[iNext];
+                                }
+                            }
+
+                            this.viewerFaces.Add(newViewerFace1);
+                            this.viewerFaces.Add(newViewerFace2);
+
+                        }
+                    }
+                }
+
+                lastCutNormal1 = newLayer.cutNormal1;
+                lastCutNormal2 = newLayer.cutNormal2;
+                lastV = 1.0f - node.percentOfPath;
+
+                if (needEndFaces && nodeIndex == path.pathNodes.Count - 1 && viewerMode)
+                {
+                    // add the top faces to the viewerFaces list here
+                    Coord faceNormal = newLayer.faceNormal;
+                    ViewerFace newViewerFace = new ViewerFace();
+                    newViewerFace.primFaceNumber = 0;
+                    int numFaces = newLayer.faces.Count;
+                    List<Face> faces = newLayer.faces;
+
+                    for (int i = 0; i < numFaces; i++)
+                    {
+                        Face face = faces[i];
+                        newViewerFace.v1 = newLayer.coords[face.v1 - coordsLen];
+                        newViewerFace.v2 = newLayer.coords[face.v2 - coordsLen];
+                        newViewerFace.v3 = newLayer.coords[face.v3 - coordsLen];
+
+                        newViewerFace.coordIndex1 = face.v1 - coordsLen;
+                        newViewerFace.coordIndex2 = face.v2 - coordsLen;
+                        newViewerFace.coordIndex3 = face.v3 - coordsLen;
+
+                        newViewerFace.n1 = faceNormal;
+                        newViewerFace.n2 = faceNormal;
+                        newViewerFace.n3 = faceNormal;
+
+                        newViewerFace.uv1 = newLayer.faceUVs[face.v1 - coordsLen];
+                        newViewerFace.uv2 = newLayer.faceUVs[face.v2 - coordsLen];
+                        newViewerFace.uv3 = newLayer.faceUVs[face.v3 - coordsLen];
+
+                        this.viewerFaces.Add(newViewerFace);
+                    }
+                }
+
+
+            } // for (int nodeIndex = 0; nodeIndex < path.pathNodes.Count; nodeIndex++)
+
+        }
+
+
+        /// <summary>
+        /// DEPRICATED - use Extrude(PathType.Linear) instead
+        /// Extrudes a profile along a straight line path. Used for prim types box, cylinder, and prism.
+        /// </summary>
+        /// 
+        public void ExtrudeLinear()
+        {
+            this.Extrude(PathType.Linear);
+        }
+
+
+        /// <summary>
+        /// DEPRICATED - use Extrude(PathType.Circular) instead
+        /// Extrude a profile into a circular path prim mesh. Used for prim types torus, tube, and ring.
+        /// </summary>
+        /// 
+        public void ExtrudeCircular()
+        {
+            this.Extrude(PathType.Circular);
+        }
+
+
+        private Coord SurfaceNormal(Coord c1, Coord c2, Coord c3)
+        {
+            Coord edge1 = new Coord(c2.X - c1.X, c2.Y - c1.Y, c2.Z - c1.Z);
+            Coord edge2 = new Coord(c3.X - c1.X, c3.Y - c1.Y, c3.Z - c1.Z);
+
+            Coord normal = Coord.Cross(edge1, edge2);
+
+            normal.Normalize();
+
+            return normal;
+        }
+
+        private Coord SurfaceNormal(Face face)
+        {
+            return SurfaceNormal(this.coords[face.v1], this.coords[face.v2], this.coords[face.v3]);
+        }
+
+        /// <summary>
+        /// Calculate the surface normal for a face in the list of faces
+        /// </summary>
+        /// <param name="faceIndex"></param>
+        /// <returns></returns>
+        public Coord SurfaceNormal(int faceIndex)
+        {
+            int numFaces = this.faces.Count;
+            if (faceIndex < 0 || faceIndex >= numFaces)
+                throw new Exception("faceIndex out of range");
+
+            return SurfaceNormal(this.faces[faceIndex]);
+        }
+
+        /// <summary>
+        /// Duplicates a PrimMesh object. All object properties are copied by value, including lists.
+        /// </summary>
+        /// <returns></returns>
+        public PrimMesh Copy()
+        {
+            PrimMesh copy = new PrimMesh(this.sides, this.profileStart, this.profileEnd, this.hollow, this.hollowSides);
+            copy.twistBegin = this.twistBegin;
+            copy.twistEnd = this.twistEnd;
+            copy.topShearX = this.topShearX;
+            copy.topShearY = this.topShearY;
+            copy.pathCutBegin = this.pathCutBegin;
+            copy.pathCutEnd = this.pathCutEnd;
+            copy.dimpleBegin = this.dimpleBegin;
+            copy.dimpleEnd = this.dimpleEnd;
+            copy.skew = this.skew;
+            copy.holeSizeX = this.holeSizeX;
+            copy.holeSizeY = this.holeSizeY;
+            copy.taperX = this.taperX;
+            copy.taperY = this.taperY;
+            copy.radius = this.radius;
+            copy.revolutions = this.revolutions;
+            copy.stepsPerRevolution = this.stepsPerRevolution;
+            copy.calcVertexNormals = this.calcVertexNormals;
+            copy.normalsProcessed = this.normalsProcessed;
+            copy.viewerMode = this.viewerMode;
+            copy.numPrimFaces = this.numPrimFaces;
+            copy.errorMessage = this.errorMessage;
+
+            copy.coords = new List<Coord>(this.coords);
+            copy.faces = new List<Face>(this.faces);
+            copy.viewerFaces = new List<ViewerFace>(this.viewerFaces);
+            copy.normals = new List<Coord>(this.normals);
+
+            return copy;
+        }
+
+        /// <summary>
+        /// Calculate surface normals for all of the faces in the list of faces in this mesh
+        /// </summary>
+        public void CalcNormals()
+        {
+            if (normalsProcessed)
+                return;
+
+            normalsProcessed = true;
+
+            int numFaces = faces.Count;
+
+            if (!this.calcVertexNormals)
+                this.normals = new List<Coord>();
+
+            for (int i = 0; i < numFaces; i++)
+            {
+                Face face = faces[i];
+
+                this.normals.Add(SurfaceNormal(i).Normalize());
+
+                int normIndex = normals.Count - 1;
+                face.n1 = normIndex;
+                face.n2 = normIndex;
+                face.n3 = normIndex;
+
+                this.faces[i] = face;
+            }
+        }
+
+        /// <summary>
+        /// Adds a value to each XYZ vertex coordinate in the mesh
+        /// </summary>
+        /// <param name="x"></param>
+        /// <param name="y"></param>
+        /// <param name="z"></param>
+        public void AddPos(float x, float y, float z)
+        {
+            int i;
+            int numVerts = this.coords.Count;
+            Coord vert;
+
+            for (i = 0; i < numVerts; i++)
+            {
+                vert = this.coords[i];
+                vert.X += x;
+                vert.Y += y;
+                vert.Z += z;
+                this.coords[i] = vert;
+            }
+
+            if (this.viewerFaces != null)
+            {
+                int numViewerFaces = this.viewerFaces.Count;
+
+                for (i = 0; i < numViewerFaces; i++)
+                {
+                    ViewerFace v = this.viewerFaces[i];
+                    v.AddPos(x, y, z);
+                    this.viewerFaces[i] = v;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Rotates the mesh
+        /// </summary>
+        /// <param name="q"></param>
+        public void AddRot(Quat q)
+        {
+            int i;
+            int numVerts = this.coords.Count;
+
+            for (i = 0; i < numVerts; i++)
+                this.coords[i] *= q;
+
+            if (this.normals != null)
+            {
+                int numNormals = this.normals.Count;
+                for (i = 0; i < numNormals; i++)
+                    this.normals[i] *= q;
+            }
+
+            if (this.viewerFaces != null)
+            {
+                int numViewerFaces = this.viewerFaces.Count;
+
+                for (i = 0; i < numViewerFaces; i++)
+                {
+                    ViewerFace v = this.viewerFaces[i];
+                    v.v1 *= q;
+                    v.v2 *= q;
+                    v.v3 *= q;
+
+                    v.n1 *= q;
+                    v.n2 *= q;
+                    v.n3 *= q;
+                    this.viewerFaces[i] = v;
+                }
+            }
+        }
+
+#if VERTEX_INDEXER
+        public VertexIndexer GetVertexIndexer()
+        {
+            if (this.viewerMode && this.viewerFaces.Count > 0)
+                return new VertexIndexer(this);
+            return null;
+        }
+#endif
+
+        /// <summary>
+        /// Scales the mesh
+        /// </summary>
+        /// <param name="x"></param>
+        /// <param name="y"></param>
+        /// <param name="z"></param>
+        public void Scale(float x, float y, float z)
+        {
+            int i;
+            int numVerts = this.coords.Count;
+            //Coord vert;
+
+            Coord m = new Coord(x, y, z);
+            for (i = 0; i < numVerts; i++)
+                this.coords[i] *= m;
+
+            if (this.viewerFaces != null)
+            {
+                int numViewerFaces = this.viewerFaces.Count;
+                for (i = 0; i < numViewerFaces; i++)
+                {
+                    ViewerFace v = this.viewerFaces[i];
+                    v.v1 *= m;
+                    v.v2 *= m;
+                    v.v3 *= m;
+                    this.viewerFaces[i] = v;
+                }
+
+            }
+
+        }
+
+        /// <summary>
+        /// Dumps the mesh to a Blender compatible "Raw" format file
+        /// </summary>
+        /// <param name="path"></param>
+        /// <param name="name"></param>
+        /// <param name="title"></param>
+        public void DumpRaw(String path, String name, String title)
+        {
+            if (path == null)
+                return;
+            String fileName = name + "_" + title + ".raw";
+            String completePath = System.IO.Path.Combine(path, fileName);
+            StreamWriter sw = new StreamWriter(completePath);
+
+            for (int i = 0; i < this.faces.Count; i++)
+            {
+                string s = this.coords[this.faces[i].v1].ToString();
+                s += " " + this.coords[this.faces[i].v2].ToString();
+                s += " " + this.coords[this.faces[i].v3].ToString();
+
+                sw.WriteLine(s);
+            }
+
+            sw.Close();
+        }
+    }
+}