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1/*
2 * Copyright (c) Contributors
3 * See CONTRIBUTORS.TXT for a full list of copyright holders.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the OpenSimulator Project nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28using System;
29using System.Collections.Generic;
30using System.Text;
31using System.IO;
32
33namespace PrimMesher
34{
35 public struct Quat
36 {
37 /// <summary>X value</summary>
38 public float X;
39 /// <summary>Y value</summary>
40 public float Y;
41 /// <summary>Z value</summary>
42 public float Z;
43 /// <summary>W value</summary>
44 public float W;
45
46 public Quat(float x, float y, float z, float w)
47 {
48 X = x;
49 Y = y;
50 Z = z;
51 W = w;
52 }
53
54 public Quat(Coord axis, float angle)
55 {
56 axis = axis.Normalize();
57
58 angle *= 0.5f;
59 float c = (float)Math.Cos(angle);
60 float s = (float)Math.Sin(angle);
61
62 X = axis.X * s;
63 Y = axis.Y * s;
64 Z = axis.Z * s;
65 W = c;
66
67 Normalize();
68 }
69
70 public float Length()
71 {
72 return (float)Math.Sqrt(X * X + Y * Y + Z * Z + W * W);
73 }
74
75 public Quat Normalize()
76 {
77 const float MAG_THRESHOLD = 0.0000001f;
78 float mag = Length();
79
80 // Catch very small rounding errors when normalizing
81 if (mag > MAG_THRESHOLD)
82 {
83 float oomag = 1f / mag;
84 X *= oomag;
85 Y *= oomag;
86 Z *= oomag;
87 W *= oomag;
88 }
89 else
90 {
91 X = 0f;
92 Y = 0f;
93 Z = 0f;
94 W = 1f;
95 }
96
97 return this;
98 }
99
100 public static Quat operator *(Quat q1, Quat q2)
101 {
102 float x = q1.W * q2.X + q1.X * q2.W + q1.Y * q2.Z - q1.Z * q2.Y;
103 float y = q1.W * q2.Y - q1.X * q2.Z + q1.Y * q2.W + q1.Z * q2.X;
104 float z = q1.W * q2.Z + q1.X * q2.Y - q1.Y * q2.X + q1.Z * q2.W;
105 float w = q1.W * q2.W - q1.X * q2.X - q1.Y * q2.Y - q1.Z * q2.Z;
106 return new Quat(x, y, z, w);
107 }
108
109 public override string ToString()
110 {
111 return "< X: " + this.X.ToString() + ", Y: " + this.Y.ToString() + ", Z: " + this.Z.ToString() + ", W: " + this.W.ToString() + ">";
112 }
113 }
114
115 public struct Coord
116 {
117 public float X;
118 public float Y;
119 public float Z;
120
121 public Coord(float x, float y, float z)
122 {
123 this.X = x;
124 this.Y = y;
125 this.Z = z;
126 }
127
128 public float Length()
129 {
130 return (float)Math.Sqrt(this.X * this.X + this.Y * this.Y + this.Z * this.Z);
131 }
132
133 public Coord Invert()
134 {
135 this.X = -this.X;
136 this.Y = -this.Y;
137 this.Z = -this.Z;
138
139 return this;
140 }
141
142 public Coord Normalize()
143 {
144 const float MAG_THRESHOLD = 0.0000001f;
145 float mag = Length();
146
147 // Catch very small rounding errors when normalizing
148 if (mag > MAG_THRESHOLD)
149 {
150 float oomag = 1.0f / mag;
151 this.X *= oomag;
152 this.Y *= oomag;
153 this.Z *= oomag;
154 }
155 else
156 {
157 this.X = 0.0f;
158 this.Y = 0.0f;
159 this.Z = 0.0f;
160 }
161
162 return this;
163 }
164
165 public override string ToString()
166 {
167 return this.X.ToString() + " " + this.Y.ToString() + " " + this.Z.ToString();
168 }
169
170 public static Coord Cross(Coord c1, Coord c2)
171 {
172 return new Coord(
173 c1.Y * c2.Z - c2.Y * c1.Z,
174 c1.Z * c2.X - c2.Z * c1.X,
175 c1.X * c2.Y - c2.X * c1.Y
176 );
177 }
178
179 public static Coord operator +(Coord v, Coord a)
180 {
181 return new Coord(v.X + a.X, v.Y + a.Y, v.Z + a.Z);
182 }
183
184 public static Coord operator *(Coord v, Coord m)
185 {
186 return new Coord(v.X * m.X, v.Y * m.Y, v.Z * m.Z);
187 }
188
189 public static Coord operator *(Coord v, Quat q)
190 {
191 // From http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/transforms/
192
193 Coord c2 = new Coord(0.0f, 0.0f, 0.0f);
194
195 c2.X = q.W * q.W * v.X +
196 2f * q.Y * q.W * v.Z -
197 2f * q.Z * q.W * v.Y +
198 q.X * q.X * v.X +
199 2f * q.Y * q.X * v.Y +
200 2f * q.Z * q.X * v.Z -
201 q.Z * q.Z * v.X -
202 q.Y * q.Y * v.X;
203
204 c2.Y =
205 2f * q.X * q.Y * v.X +
206 q.Y * q.Y * v.Y +
207 2f * q.Z * q.Y * v.Z +
208 2f * q.W * q.Z * v.X -
209 q.Z * q.Z * v.Y +
210 q.W * q.W * v.Y -
211 2f * q.X * q.W * v.Z -
212 q.X * q.X * v.Y;
213
214 c2.Z =
215 2f * q.X * q.Z * v.X +
216 2f * q.Y * q.Z * v.Y +
217 q.Z * q.Z * v.Z -
218 2f * q.W * q.Y * v.X -
219 q.Y * q.Y * v.Z +
220 2f * q.W * q.X * v.Y -
221 q.X * q.X * v.Z +
222 q.W * q.W * v.Z;
223
224 return c2;
225 }
226 }
227
228 public struct Face
229 {
230 public int primFace;
231
232 // vertices
233 public int v1;
234 public int v2;
235 public int v3;
236
237 public Face(int v1, int v2, int v3)
238 {
239 primFace = 0;
240
241 this.v1 = v1;
242 this.v2 = v2;
243 this.v3 = v3;
244
245 }
246
247 public Coord SurfaceNormal(List<Coord> coordList)
248 {
249 Coord c1 = coordList[this.v1];
250 Coord c2 = coordList[this.v2];
251 Coord c3 = coordList[this.v3];
252
253 Coord edge1 = new Coord(c2.X - c1.X, c2.Y - c1.Y, c2.Z - c1.Z);
254 Coord edge2 = new Coord(c3.X - c1.X, c3.Y - c1.Y, c3.Z - c1.Z);
255
256 return Coord.Cross(edge1, edge2).Normalize();
257 }
258 }
259
260 internal struct Angle
261 {
262 internal float angle;
263 internal float X;
264 internal float Y;
265
266 internal Angle(float angle, float x, float y)
267 {
268 this.angle = angle;
269 this.X = x;
270 this.Y = y;
271 }
272 }
273
274 internal class AngleList
275 {
276 private float iX, iY; // intersection point
277
278 private static Angle[] angles3 =
279 {
280 new Angle(0.0f, 1.0f, 0.0f),
281 new Angle(0.33333333333333333f, -0.5f, 0.86602540378443871f),
282 new Angle(0.66666666666666667f, -0.5f, -0.86602540378443837f),
283 new Angle(1.0f, 1.0f, 0.0f)
284 };
285
286 private static Angle[] angles4 =
287 {
288 new Angle(0.0f, 1.0f, 0.0f),
289 new Angle(0.25f, 0.0f, 1.0f),
290 new Angle(0.5f, -1.0f, 0.0f),
291 new Angle(0.75f, 0.0f, -1.0f),
292 new Angle(1.0f, 1.0f, 0.0f)
293 };
294
295 private static Angle[] angles6 =
296 {
297 new Angle(0.0f, 1.0f, 0.0f),
298 new Angle(0.16666666666666667f, 0.5f, 0.8660254037844386f),
299 new Angle(0.33333333333333333f, -0.5f, 0.86602540378443871f),
300 new Angle(0.5f, -1.0f, 0.0f),
301 new Angle(0.66666666666666667f, -0.5f, -0.86602540378443837f),
302 new Angle(0.83333333333333326f, 0.5f, -0.86602540378443904f),
303 new Angle(1.0f, 1.0f, 0.0f)
304 };
305
306 private static Angle[] angles12 =
307 {
308 new Angle(0.0f, 1.0f, 0.0f),
309 new Angle(0.083333333333333329f, 0.86602540378443871f, 0.5f),
310 new Angle(0.16666666666666667f, 0.5f, 0.8660254037844386f),
311 new Angle(0.25f, 0.0f, 1.0f),
312 new Angle(0.33333333333333333f, -0.5f, 0.86602540378443871f),
313 new Angle(0.41666666666666663f, -0.86602540378443849f, 0.5f),
314 new Angle(0.5f, -1.0f, 0.0f),
315 new Angle(0.58333333333333326f, -0.86602540378443882f, -0.5f),
316 new Angle(0.66666666666666667f, -0.5f, -0.86602540378443837f),
317 new Angle(0.75f, 0.0f, -1.0f),
318 new Angle(0.83333333333333326f, 0.5f, -0.86602540378443904f),
319 new Angle(0.91666666666666663f, 0.86602540378443837f, -0.5f),
320 new Angle(1.0f, 1.0f, 0.0f)
321 };
322
323 private static Angle[] angles24 =
324 {
325 new Angle(0.0f, 1.0f, 0.0f),
326 new Angle(0.041666666666666664f, 0.96592582628906831f, 0.25881904510252074f),
327 new Angle(0.083333333333333329f, 0.86602540378443871f, 0.5f),
328 new Angle(0.125f, 0.70710678118654757f, 0.70710678118654746f),
329 new Angle(0.16666666666666667f, 0.5f, 0.8660254037844386f),
330 new Angle(0.20833333333333331f, 0.25881904510252096f, 0.9659258262890682f),
331 new Angle(0.25f, 0.0f, 1.0f),
332 new Angle(0.29166666666666663f, -0.25881904510252063f, 0.96592582628906831f),
333 new Angle(0.33333333333333333f, -0.5f, 0.86602540378443871f),
334 new Angle(0.375f, -0.70710678118654746f, 0.70710678118654757f),
335 new Angle(0.41666666666666663f, -0.86602540378443849f, 0.5f),
336 new Angle(0.45833333333333331f, -0.9659258262890682f, 0.25881904510252102f),
337 new Angle(0.5f, -1.0f, 0.0f),
338 new Angle(0.54166666666666663f, -0.96592582628906842f, -0.25881904510252035f),
339 new Angle(0.58333333333333326f, -0.86602540378443882f, -0.5f),
340 new Angle(0.62499999999999989f, -0.70710678118654791f, -0.70710678118654713f),
341 new Angle(0.66666666666666667f, -0.5f, -0.86602540378443837f),
342 new Angle(0.70833333333333326f, -0.25881904510252152f, -0.96592582628906809f),
343 new Angle(0.75f, 0.0f, -1.0f),
344 new Angle(0.79166666666666663f, 0.2588190451025203f, -0.96592582628906842f),
345 new Angle(0.83333333333333326f, 0.5f, -0.86602540378443904f),
346 new Angle(0.875f, 0.70710678118654735f, -0.70710678118654768f),
347 new Angle(0.91666666666666663f, 0.86602540378443837f, -0.5f),
348 new Angle(0.95833333333333326f, 0.96592582628906809f, -0.25881904510252157f),
349 new Angle(1.0f, 1.0f, 0.0f)
350 };
351
352 private Angle interpolatePoints(float newPoint, Angle p1, Angle p2)
353 {
354 float m = (newPoint - p1.angle) / (p2.angle - p1.angle);
355 return new Angle(newPoint, p1.X + m * (p2.X - p1.X), p1.Y + m * (p2.Y - p1.Y));
356 }
357
358 private void intersection(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
359 { // ref: http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline2d/
360 double denom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1);
361 double uaNumerator = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3);
362
363 if (denom != 0.0)
364 {
365 double ua = uaNumerator / denom;
366 iX = (float)(x1 + ua * (x2 - x1));
367 iY = (float)(y1 + ua * (y2 - y1));
368 }
369 }
370
371 internal List<Angle> angles;
372
373 internal void makeAngles(int sides, float startAngle, float stopAngle, bool hasCut)
374 {
375 angles = new List<Angle>();
376
377 const double twoPi = System.Math.PI * 2.0;
378 const float twoPiInv = (float)(1.0d / twoPi);
379
380 if (sides < 1)
381 throw new Exception("number of sides not greater than zero");
382 if (stopAngle <= startAngle)
383 throw new Exception("stopAngle not greater than startAngle");
384
385 if ((sides == 3 || sides == 4 || sides == 6 || sides == 12 || sides == 24))
386 {
387 startAngle *= twoPiInv;
388 stopAngle *= twoPiInv;
389
390 Angle[] sourceAngles;
391 switch (sides)
392 {
393 case 3:
394 sourceAngles = angles3;
395 break;
396 case 4:
397 sourceAngles = angles4;
398 break;
399 case 6:
400 sourceAngles = angles6;
401 break;
402 case 12:
403 sourceAngles = angles12;
404 break;
405 default:
406 sourceAngles = angles24;
407 break;
408 }
409
410 int startAngleIndex = (int)(startAngle * sides);
411 int endAngleIndex = sourceAngles.Length - 1;
412
413 if (hasCut)
414 {
415 if (stopAngle < 1.0f)
416 endAngleIndex = (int)(stopAngle * sides) + 1;
417 if (endAngleIndex == startAngleIndex)
418 endAngleIndex++;
419
420 for (int angleIndex = startAngleIndex; angleIndex < endAngleIndex + 1; angleIndex++)
421 {
422 angles.Add(sourceAngles[angleIndex]);
423 }
424
425 if (startAngle > 0.0f)
426 angles[0] = interpolatePoints(startAngle, angles[0], angles[1]);
427
428 if (stopAngle < 1.0f)
429 {
430 int lastAngleIndex = angles.Count - 1;
431 angles[lastAngleIndex] = interpolatePoints(stopAngle, angles[lastAngleIndex - 1], angles[lastAngleIndex]);
432 }
433 }
434 else
435 {
436 for (int angleIndex = startAngleIndex; angleIndex < endAngleIndex; angleIndex++)
437 angles.Add(sourceAngles[angleIndex]);
438 }
439 }
440 else
441 {
442 double stepSize = twoPi / sides;
443
444 int startStep = (int)(startAngle / stepSize);
445 double angle = stepSize * startStep;
446 int step = startStep;
447 double stopAngleTest = stopAngle;
448 if (stopAngle < twoPi)
449 {
450 stopAngleTest = stepSize * ((int)(stopAngle / stepSize) + 1);
451 if (stopAngleTest < stopAngle)
452 stopAngleTest += stepSize;
453 if (stopAngleTest > twoPi)
454 stopAngleTest = twoPi;
455 }
456
457 while (angle <= stopAngleTest)
458 {
459 Angle newAngle;
460 newAngle.angle = (float)angle;
461 newAngle.X = (float)System.Math.Cos(angle);
462 newAngle.Y = (float)System.Math.Sin(angle);
463 angles.Add(newAngle);
464 step += 1;
465 angle = stepSize * step;
466 }
467
468 if (startAngle > angles[0].angle)
469 {
470 Angle newAngle;
471 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));
472 newAngle.angle = startAngle;
473 newAngle.X = iX;
474 newAngle.Y = iY;
475 angles[0] = newAngle;
476 }
477
478 int index = angles.Count - 1;
479 if (stopAngle < angles[index].angle)
480 {
481 Angle newAngle;
482 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));
483 newAngle.angle = stopAngle;
484 newAngle.X = iX;
485 newAngle.Y = iY;
486 angles[index] = newAngle;
487 }
488 }
489 }
490 }
491
492 /// <summary>
493 /// generates a profile for extrusion
494 /// </summary>
495 public class Profile
496 {
497 private const float twoPi = 2.0f * (float)Math.PI;
498
499 public string errorMessage = null;
500
501 public List<Coord> coords;
502 public List<Face> faces;
503
504 // use these for making individual meshes for each prim face
505 public List<int> outerCoordIndices = null;
506 public List<int> hollowCoordIndices = null;
507
508 public int numOuterVerts = 0;
509 public int numHollowVerts = 0;
510
511 public int outerFaceNumber = -1;
512 public int hollowFaceNumber = -1;
513
514 public int bottomFaceNumber = 0;
515 public int numPrimFaces = 0;
516
517 public Profile()
518 {
519 this.coords = new List<Coord>();
520 this.faces = new List<Face>();
521 }
522
523 public Profile(int sides, float profileStart, float profileEnd, float hollow, int hollowSides, bool hasProfileCut, bool createFaces)
524 {
525 const float halfSqr2 = 0.7071067811866f;
526
527 this.coords = new List<Coord>();
528 this.faces = new List<Face>();
529
530 List<Coord> hollowCoords = new List<Coord>();
531
532 bool hasHollow = (hollow > 0.0f);
533
534 AngleList angles = new AngleList();
535 AngleList hollowAngles = new AngleList();
536
537 float xScale = 0.5f;
538 float yScale = 0.5f;
539 if (sides == 4) // corners of a square are sqrt(2) from center
540 {
541 xScale = halfSqr2;
542 yScale = halfSqr2;
543 }
544
545 float startAngle = profileStart * twoPi;
546 float stopAngle = profileEnd * twoPi;
547
548 try { angles.makeAngles(sides, startAngle, stopAngle,hasProfileCut); }
549 catch (Exception ex)
550 {
551
552 errorMessage = "makeAngles failed: Exception: " + ex.ToString()
553 + "\nsides: " + sides.ToString() + " startAngle: " + startAngle.ToString() + " stopAngle: " + stopAngle.ToString();
554
555 return;
556 }
557
558 this.numOuterVerts = angles.angles.Count;
559
560 Angle angle;
561 Coord newVert = new Coord();
562
563 // flag to create as few triangles as possible for 3 or 4 side profile
564 bool simpleFace = (sides < 5 && !hasHollow && !hasProfileCut);
565
566 if (hasHollow)
567 {
568 if (sides == hollowSides)
569 hollowAngles = angles;
570 else
571 {
572 try { hollowAngles.makeAngles(hollowSides, startAngle, stopAngle, hasProfileCut); }
573 catch (Exception ex)
574 {
575 errorMessage = "makeAngles failed: Exception: " + ex.ToString()
576 + "\nsides: " + sides.ToString() + " startAngle: " + startAngle.ToString() + " stopAngle: " + stopAngle.ToString();
577
578 return;
579 }
580
581 int numHollowAngles = hollowAngles.angles.Count;
582 for (int i = 0; i < numHollowAngles; i++)
583 {
584 angle = hollowAngles.angles[i];
585 newVert.X = hollow * xScale * angle.X;
586 newVert.Y = hollow * yScale * angle.Y;
587 newVert.Z = 0.0f;
588
589 hollowCoords.Add(newVert);
590 }
591 }
592 this.numHollowVerts = hollowAngles.angles.Count;
593 }
594 else if (!simpleFace)
595 {
596 Coord center = new Coord(0.0f, 0.0f, 0.0f);
597 this.coords.Add(center);
598 }
599
600 int numAngles = angles.angles.Count;
601 bool hollowsame = (hasHollow && hollowSides == sides);
602
603 for (int i = 0; i < numAngles; i++)
604 {
605 angle = angles.angles[i];
606 newVert.X = angle.X * xScale;
607 newVert.Y = angle.Y * yScale;
608 newVert.Z = 0.0f;
609 this.coords.Add(newVert);
610 if (hollowsame)
611 {
612 newVert.X *= hollow;
613 newVert.Y *= hollow;
614 hollowCoords.Add(newVert);
615 }
616 }
617
618 if (hasHollow)
619 {
620 hollowCoords.Reverse();
621 this.coords.AddRange(hollowCoords);
622
623 if (createFaces)
624 {
625 int numTotalVerts = this.numOuterVerts + this.numHollowVerts;
626
627 if (this.numOuterVerts == this.numHollowVerts)
628 {
629 Face newFace = new Face();
630
631 for (int coordIndex = 0; coordIndex < this.numOuterVerts - 1; coordIndex++)
632 {
633 newFace.v1 = coordIndex;
634 newFace.v2 = coordIndex + 1;
635 newFace.v3 = numTotalVerts - coordIndex - 1;
636 this.faces.Add(newFace);
637
638 newFace.v1 = coordIndex + 1;
639 newFace.v2 = numTotalVerts - coordIndex - 2;
640 newFace.v3 = numTotalVerts - coordIndex - 1;
641 this.faces.Add(newFace);
642 }
643 if (!hasProfileCut)
644 {
645 newFace.v1 = this.numOuterVerts - 1;
646 newFace.v2 = 0;
647 newFace.v3 = this.numOuterVerts;
648 this.faces.Add(newFace);
649
650 newFace.v1 = 0;
651 newFace.v2 = numTotalVerts - 1;
652 newFace.v3 = this.numOuterVerts;
653 this.faces.Add(newFace);
654 }
655 }
656 else if (this.numOuterVerts < this.numHollowVerts)
657 {
658 Face newFace = new Face();
659 int j = 0; // j is the index for outer vertices
660 int i;
661 int maxJ = this.numOuterVerts - 1;
662 float curHollowAngle = 0;
663 for (i = 0; i < this.numHollowVerts; i++) // i is the index for inner vertices
664 {
665 curHollowAngle = hollowAngles.angles[i].angle;
666 if (j < maxJ)
667 {
668 if (angles.angles[j + 1].angle - curHollowAngle < curHollowAngle - angles.angles[j].angle + 0.000001f)
669 {
670 newFace.v1 = numTotalVerts - i - 1;
671 newFace.v2 = j;
672 newFace.v3 = j + 1;
673 this.faces.Add(newFace);
674 j++;
675 }
676 }
677 else
678 {
679 if (1.0f - curHollowAngle < curHollowAngle - angles.angles[j].angle + 0.000001f)
680 break;
681 }
682
683 newFace.v1 = j;
684 newFace.v2 = numTotalVerts - i - 2;
685 newFace.v3 = numTotalVerts - i - 1;
686
687 this.faces.Add(newFace);
688 }
689
690 if (!hasProfileCut)
691 {
692 if (i == this.numHollowVerts)
693 {
694 newFace.v1 = numTotalVerts - this.numHollowVerts;
695 newFace.v2 = maxJ;
696 newFace.v3 = 0;
697
698 this.faces.Add(newFace);
699 }
700 else
701 {
702 if (1.0f - curHollowAngle < curHollowAngle - angles.angles[maxJ].angle + 0.000001f)
703 {
704 newFace.v1 = numTotalVerts - i - 1;
705 newFace.v2 = maxJ;
706 newFace.v3 = 0;
707
708 this.faces.Add(newFace);
709 }
710
711 for (; i < this.numHollowVerts - 1; i++)
712 {
713 newFace.v1 = 0;
714 newFace.v2 = numTotalVerts - i - 2;
715 newFace.v3 = numTotalVerts - i - 1;
716
717 this.faces.Add(newFace);
718 }
719 }
720
721 newFace.v1 = 0;
722 newFace.v2 = numTotalVerts - this.numHollowVerts;
723 newFace.v3 = numTotalVerts - 1;
724 this.faces.Add(newFace);
725 }
726 }
727 else // numHollowVerts < numOuterVerts
728 {
729 Face newFace = new Face();
730 int j = 0; // j is the index for inner vertices
731 int maxJ = this.numHollowVerts - 1;
732 for (int i = 0; i < this.numOuterVerts; i++)
733 {
734 if (j < maxJ)
735 if (hollowAngles.angles[j + 1].angle - angles.angles[i].angle < angles.angles[i].angle - hollowAngles.angles[j].angle + 0.000001f)
736 {
737 newFace.v1 = i;
738 newFace.v2 = numTotalVerts - j - 2;
739 newFace.v3 = numTotalVerts - j - 1;
740
741 this.faces.Add(newFace);
742 j += 1;
743 }
744
745 newFace.v1 = numTotalVerts - j - 1;
746 newFace.v2 = i;
747 newFace.v3 = i + 1;
748
749 this.faces.Add(newFace);
750 }
751
752 if (!hasProfileCut)
753 {
754 int i = this.numOuterVerts - 1;
755
756 if (hollowAngles.angles[0].angle - angles.angles[i].angle < angles.angles[i].angle - hollowAngles.angles[maxJ].angle + 0.000001f)
757 {
758 newFace.v1 = 0;
759 newFace.v2 = numTotalVerts - maxJ - 1;
760 newFace.v3 = numTotalVerts - 1;
761
762 this.faces.Add(newFace);
763 }
764
765 newFace.v1 = numTotalVerts - maxJ - 1;
766 newFace.v2 = i;
767 newFace.v3 = 0;
768
769 this.faces.Add(newFace);
770 }
771 }
772 }
773
774 }
775
776 else if (createFaces)
777 {
778 if (simpleFace)
779 {
780 if (sides == 3)
781 this.faces.Add(new Face(0, 1, 2));
782 else if (sides == 4)
783 {
784 this.faces.Add(new Face(0, 1, 2));
785 this.faces.Add(new Face(0, 2, 3));
786 }
787 }
788 else
789 {
790 for (int i = 1; i < numAngles ; i++)
791 {
792 Face newFace = new Face();
793 newFace.v1 = 0;
794 newFace.v2 = i;
795 newFace.v3 = i + 1;
796 this.faces.Add(newFace);
797 }
798 if (!hasProfileCut)
799 {
800 Face newFace = new Face();
801 newFace.v1 = 0;
802 newFace.v2 = numAngles;
803 newFace.v3 = 1;
804 this.faces.Add(newFace);
805 }
806 }
807 }
808
809
810 hollowCoords = null;
811 }
812
813
814 public Profile Copy()
815 {
816 return this.Copy(true);
817 }
818
819 public Profile Copy(bool needFaces)
820 {
821 Profile copy = new Profile();
822
823 copy.coords.AddRange(this.coords);
824
825 if (needFaces)
826 copy.faces.AddRange(this.faces);
827
828 copy.numOuterVerts = this.numOuterVerts;
829 copy.numHollowVerts = this.numHollowVerts;
830
831 return copy;
832 }
833
834 public void AddPos(Coord v)
835 {
836 this.AddPos(v.X, v.Y, v.Z);
837 }
838
839 public void AddPos(float x, float y, float z)
840 {
841 int i;
842 int numVerts = this.coords.Count;
843 Coord vert;
844
845 for (i = 0; i < numVerts; i++)
846 {
847 vert = this.coords[i];
848 vert.X += x;
849 vert.Y += y;
850 vert.Z += z;
851 this.coords[i] = vert;
852 }
853 }
854
855 public void AddRot(Quat q)
856 {
857 int i;
858 int numVerts = this.coords.Count;
859
860 for (i = 0; i < numVerts; i++)
861 this.coords[i] *= q;
862 }
863
864 public void Scale(float x, float y)
865 {
866 int i;
867 int numVerts = this.coords.Count;
868 Coord vert;
869
870 for (i = 0; i < numVerts; i++)
871 {
872 vert = this.coords[i];
873 vert.X *= x;
874 vert.Y *= y;
875 this.coords[i] = vert;
876 }
877 }
878
879 /// <summary>
880 /// Changes order of the vertex indices and negates the center vertex normal. Does not alter vertex normals of radial vertices
881 /// </summary>
882 public void FlipNormals()
883 {
884 int i;
885 int numFaces = this.faces.Count;
886 Face tmpFace;
887 int tmp;
888
889 for (i = 0; i < numFaces; i++)
890 {
891 tmpFace = this.faces[i];
892 tmp = tmpFace.v3;
893 tmpFace.v3 = tmpFace.v1;
894 tmpFace.v1 = tmp;
895 this.faces[i] = tmpFace;
896 }
897 }
898
899 public void AddValue2FaceVertexIndices(int num)
900 {
901 int numFaces = this.faces.Count;
902 Face tmpFace;
903 for (int i = 0; i < numFaces; i++)
904 {
905 tmpFace = this.faces[i];
906 tmpFace.v1 += num;
907 tmpFace.v2 += num;
908 tmpFace.v3 += num;
909
910 this.faces[i] = tmpFace;
911 }
912 }
913
914 public void DumpRaw(String path, String name, String title)
915 {
916 if (path == null)
917 return;
918 String fileName = name + "_" + title + ".raw";
919 String completePath = System.IO.Path.Combine(path, fileName);
920 StreamWriter sw = new StreamWriter(completePath);
921
922 for (int i = 0; i < this.faces.Count; i++)
923 {
924 string s = this.coords[this.faces[i].v1].ToString();
925 s += " " + this.coords[this.faces[i].v2].ToString();
926 s += " " + this.coords[this.faces[i].v3].ToString();
927
928 sw.WriteLine(s);
929 }
930
931 sw.Close();
932 }
933 }
934
935 public struct PathNode
936 {
937 public Coord position;
938 public Quat rotation;
939 public float xScale;
940 public float yScale;
941 public float percentOfPath;
942 }
943
944 public enum PathType { Linear = 0, Circular = 1, Flexible = 2 }
945
946 public class Path
947 {
948 public List<PathNode> pathNodes = new List<PathNode>();
949
950 public float twistBegin = 0.0f;
951 public float twistEnd = 0.0f;
952 public float topShearX = 0.0f;
953 public float topShearY = 0.0f;
954 public float pathCutBegin = 0.0f;
955 public float pathCutEnd = 1.0f;
956 public float dimpleBegin = 0.0f;
957 public float dimpleEnd = 1.0f;
958 public float skew = 0.0f;
959 public float holeSizeX = 1.0f; // called pathScaleX in pbs
960 public float holeSizeY = 0.25f;
961 public float taperX = 0.0f;
962 public float taperY = 0.0f;
963 public float radius = 0.0f;
964 public float revolutions = 1.0f;
965 public int stepsPerRevolution = 24;
966
967 private const float twoPi = 2.0f * (float)Math.PI;
968
969 public void Create(PathType pathType, int steps)
970 {
971 if (this.taperX > 0.999f)
972 this.taperX = 0.999f;
973 if (this.taperX < -0.999f)
974 this.taperX = -0.999f;
975 if (this.taperY > 0.999f)
976 this.taperY = 0.999f;
977 if (this.taperY < -0.999f)
978 this.taperY = -0.999f;
979
980 if (pathType == PathType.Linear || pathType == PathType.Flexible)
981 {
982 int step = 0;
983
984 float length = this.pathCutEnd - this.pathCutBegin;
985 float twistTotal = twistEnd - twistBegin;
986 float twistTotalAbs = Math.Abs(twistTotal);
987 if (twistTotalAbs > 0.01f)
988 steps += (int)(twistTotalAbs * 3.66); // dahlia's magic number
989
990 float start = -0.5f;
991 float stepSize = length / (float)steps;
992 float percentOfPathMultiplier = stepSize * 0.999999f;
993 float xOffset = this.topShearX * this.pathCutBegin;
994 float yOffset = this.topShearY * this.pathCutBegin;
995 float zOffset = start;
996 float xOffsetStepIncrement = this.topShearX * length / steps;
997 float yOffsetStepIncrement = this.topShearY * length / steps;
998
999 float percentOfPath = this.pathCutBegin;
1000 zOffset += percentOfPath;
1001
1002 // sanity checks
1003
1004 bool done = false;
1005
1006 while (!done)
1007 {
1008 PathNode newNode = new PathNode();
1009
1010 newNode.xScale = 1.0f;
1011 if (this.taperX == 0.0f)
1012 newNode.xScale = 1.0f;
1013 else if (this.taperX > 0.0f)
1014 newNode.xScale = 1.0f - percentOfPath * this.taperX;
1015 else newNode.xScale = 1.0f + (1.0f - percentOfPath) * this.taperX;
1016
1017 newNode.yScale = 1.0f;
1018 if (this.taperY == 0.0f)
1019 newNode.yScale = 1.0f;
1020 else if (this.taperY > 0.0f)
1021 newNode.yScale = 1.0f - percentOfPath * this.taperY;
1022 else newNode.yScale = 1.0f + (1.0f - percentOfPath) * this.taperY;
1023
1024 float twist = twistBegin + twistTotal * percentOfPath;
1025
1026 newNode.rotation = new Quat(new Coord(0.0f, 0.0f, 1.0f), twist);
1027 newNode.position = new Coord(xOffset, yOffset, zOffset);
1028 newNode.percentOfPath = percentOfPath;
1029
1030 pathNodes.Add(newNode);
1031
1032 if (step < steps)
1033 {
1034 step += 1;
1035 percentOfPath += percentOfPathMultiplier;
1036 xOffset += xOffsetStepIncrement;
1037 yOffset += yOffsetStepIncrement;
1038 zOffset += stepSize;
1039 if (percentOfPath > this.pathCutEnd)
1040 done = true;
1041 }
1042 else done = true;
1043 }
1044 } // end of linear path code
1045
1046 else // pathType == Circular
1047 {
1048 float twistTotal = twistEnd - twistBegin;
1049
1050 // if the profile has a lot of twist, add more layers otherwise the layers may overlap
1051 // and the resulting mesh may be quite inaccurate. This method is arbitrary and doesn't
1052 // accurately match the viewer
1053 float twistTotalAbs = Math.Abs(twistTotal);
1054 if (twistTotalAbs > 0.01f)
1055 {
1056 if (twistTotalAbs > Math.PI * 1.5f)
1057 steps *= 2;
1058 if (twistTotalAbs > Math.PI * 3.0f)
1059 steps *= 2;
1060 }
1061
1062 float yPathScale = this.holeSizeY * 0.5f;
1063 float pathLength = this.pathCutEnd - this.pathCutBegin;
1064 float totalSkew = this.skew * 2.0f * pathLength;
1065 float skewStart = this.pathCutBegin * 2.0f * this.skew - this.skew;
1066 float xOffsetTopShearXFactor = this.topShearX * (0.25f + 0.5f * (0.5f - this.holeSizeY));
1067 float yShearCompensation = 1.0f + Math.Abs(this.topShearY) * 0.25f;
1068
1069 // It's not quite clear what pushY (Y top shear) does, but subtracting it from the start and end
1070 // angles appears to approximate it's effects on path cut. Likewise, adding it to the angle used
1071 // to calculate the sine for generating the path radius appears to approximate it's effects there
1072 // too, but there are some subtle differences in the radius which are noticeable as the prim size
1073 // increases and it may affect megaprims quite a bit. The effect of the Y top shear parameter on
1074 // the meshes generated with this technique appear nearly identical in shape to the same prims when
1075 // displayed by the viewer.
1076
1077 float startAngle = (twoPi * this.pathCutBegin * this.revolutions) - this.topShearY * 0.9f;
1078 float endAngle = (twoPi * this.pathCutEnd * this.revolutions) - this.topShearY * 0.9f;
1079 float stepSize = twoPi / this.stepsPerRevolution;
1080
1081 int step = (int)(startAngle / stepSize);
1082 float angle = startAngle;
1083
1084 bool done = false;
1085 while (!done) // loop through the length of the path and add the layers
1086 {
1087 PathNode newNode = new PathNode();
1088
1089 float xProfileScale = (1.0f - Math.Abs(this.skew)) * this.holeSizeX;
1090 float yProfileScale = this.holeSizeY;
1091
1092 float percentOfPath = angle / (twoPi * this.revolutions);
1093 float percentOfAngles = (angle - startAngle) / (endAngle - startAngle);
1094
1095 if (this.taperX > 0.01f)
1096 xProfileScale *= 1.0f - percentOfPath * this.taperX;
1097 else if (this.taperX < -0.01f)
1098 xProfileScale *= 1.0f + (1.0f - percentOfPath) * this.taperX;
1099
1100 if (this.taperY > 0.01f)
1101 yProfileScale *= 1.0f - percentOfPath * this.taperY;
1102 else if (this.taperY < -0.01f)
1103 yProfileScale *= 1.0f + (1.0f - percentOfPath) * this.taperY;
1104
1105 newNode.xScale = xProfileScale;
1106 newNode.yScale = yProfileScale;
1107
1108 float radiusScale = 1.0f;
1109 if (this.radius > 0.001f)
1110 radiusScale = 1.0f - this.radius * percentOfPath;
1111 else if (this.radius < 0.001f)
1112 radiusScale = 1.0f + this.radius * (1.0f - percentOfPath);
1113
1114 float twist = twistBegin + twistTotal * percentOfPath;
1115
1116 float xOffset = 0.5f * (skewStart + totalSkew * percentOfAngles);
1117 xOffset += (float)Math.Sin(angle) * xOffsetTopShearXFactor;
1118
1119 float yOffset = yShearCompensation * (float)Math.Cos(angle) * (0.5f - yPathScale) * radiusScale;
1120
1121 float zOffset = (float)Math.Sin(angle + this.topShearY) * (0.5f - yPathScale) * radiusScale;
1122
1123 newNode.position = new Coord(xOffset, yOffset, zOffset);
1124
1125 // now orient the rotation of the profile layer relative to it's position on the path
1126 // adding taperY to the angle used to generate the quat appears to approximate the viewer
1127
1128 newNode.rotation = new Quat(new Coord(1.0f, 0.0f, 0.0f), angle + this.topShearY);
1129
1130 // next apply twist rotation to the profile layer
1131 if (twistTotal != 0.0f || twistBegin != 0.0f)
1132 newNode.rotation *= new Quat(new Coord(0.0f, 0.0f, 1.0f), twist);
1133
1134 newNode.percentOfPath = percentOfPath;
1135
1136 pathNodes.Add(newNode);
1137
1138 // calculate terms for next iteration
1139 // calculate the angle for the next iteration of the loop
1140
1141 if (angle >= endAngle - 0.01)
1142 done = true;
1143 else
1144 {
1145 step += 1;
1146 angle = stepSize * step;
1147 if (angle > endAngle)
1148 angle = endAngle;
1149 }
1150 }
1151 }
1152 }
1153 }
1154
1155 public class PrimMesh
1156 {
1157 public string errorMessage = "";
1158 private const float twoPi = 2.0f * (float)Math.PI;
1159
1160 public List<Coord> coords;
1161// public List<Coord> normals;
1162 public List<Face> faces;
1163
1164 private int sides = 4;
1165 private int hollowSides = 4;
1166 private float profileStart = 0.0f;
1167 private float profileEnd = 1.0f;
1168 private float hollow = 0.0f;
1169 public int twistBegin = 0;
1170 public int twistEnd = 0;
1171 public float topShearX = 0.0f;
1172 public float topShearY = 0.0f;
1173 public float pathCutBegin = 0.0f;
1174 public float pathCutEnd = 1.0f;
1175 public float dimpleBegin = 0.0f;
1176 public float dimpleEnd = 1.0f;
1177 public float skew = 0.0f;
1178 public float holeSizeX = 1.0f; // called pathScaleX in pbs
1179 public float holeSizeY = 0.25f;
1180 public float taperX = 0.0f;
1181 public float taperY = 0.0f;
1182 public float radius = 0.0f;
1183 public float revolutions = 1.0f;
1184 public int stepsPerRevolution = 24;
1185
1186 private bool hasProfileCut = false;
1187 private bool hasHollow = false;
1188
1189 public int numPrimFaces = 0;
1190
1191 /// <summary>
1192 /// Human readable string representation of the parameters used to create a mesh.
1193 /// </summary>
1194 /// <returns></returns>
1195 public string ParamsToDisplayString()
1196 {
1197 string s = "";
1198 s += "sides..................: " + this.sides.ToString();
1199 s += "\nhollowSides..........: " + this.hollowSides.ToString();
1200 s += "\nprofileStart.........: " + this.profileStart.ToString();
1201 s += "\nprofileEnd...........: " + this.profileEnd.ToString();
1202 s += "\nhollow...............: " + this.hollow.ToString();
1203 s += "\ntwistBegin...........: " + this.twistBegin.ToString();
1204 s += "\ntwistEnd.............: " + this.twistEnd.ToString();
1205 s += "\ntopShearX............: " + this.topShearX.ToString();
1206 s += "\ntopShearY............: " + this.topShearY.ToString();
1207 s += "\npathCutBegin.........: " + this.pathCutBegin.ToString();
1208 s += "\npathCutEnd...........: " + this.pathCutEnd.ToString();
1209 s += "\ndimpleBegin..........: " + this.dimpleBegin.ToString();
1210 s += "\ndimpleEnd............: " + this.dimpleEnd.ToString();
1211 s += "\nskew.................: " + this.skew.ToString();
1212 s += "\nholeSizeX............: " + this.holeSizeX.ToString();
1213 s += "\nholeSizeY............: " + this.holeSizeY.ToString();
1214 s += "\ntaperX...............: " + this.taperX.ToString();
1215 s += "\ntaperY...............: " + this.taperY.ToString();
1216 s += "\nradius...............: " + this.radius.ToString();
1217 s += "\nrevolutions..........: " + this.revolutions.ToString();
1218 s += "\nstepsPerRevolution...: " + this.stepsPerRevolution.ToString();
1219 s += "\nhasProfileCut........: " + this.hasProfileCut.ToString();
1220 s += "\nhasHollow............: " + this.hasHollow.ToString();
1221
1222 return s;
1223 }
1224
1225 public bool HasProfileCut
1226 {
1227 get { return hasProfileCut; }
1228 set { hasProfileCut = value; }
1229 }
1230
1231 public bool HasHollow
1232 {
1233 get { return hasHollow; }
1234 }
1235
1236
1237 /// <summary>
1238 /// Constructs a PrimMesh object and creates the profile for extrusion.
1239 /// </summary>
1240 /// <param name="sides"></param>
1241 /// <param name="profileStart"></param>
1242 /// <param name="profileEnd"></param>
1243 /// <param name="hollow"></param>
1244 /// <param name="hollowSides"></param>
1245 /// <param name="sphereMode"></param>
1246 public PrimMesh(int sides, float profileStart, float profileEnd, float hollow, int hollowSides)
1247 {
1248 this.coords = new List<Coord>();
1249 this.faces = new List<Face>();
1250
1251 this.sides = sides;
1252 this.profileStart = profileStart;
1253 this.profileEnd = profileEnd;
1254 this.hollow = hollow;
1255 this.hollowSides = hollowSides;
1256
1257 if (sides < 3)
1258 this.sides = 3;
1259 if (hollowSides < 3)
1260 this.hollowSides = 3;
1261 if (profileStart < 0.0f)
1262 this.profileStart = 0.0f;
1263 if (profileEnd > 1.0f)
1264 this.profileEnd = 1.0f;
1265 if (profileEnd < 0.02f)
1266 this.profileEnd = 0.02f;
1267 if (profileStart >= profileEnd)
1268 this.profileStart = profileEnd - 0.02f;
1269 if (hollow > 0.99f)
1270 this.hollow = 0.99f;
1271 if (hollow < 0.0f)
1272 this.hollow = 0.0f;
1273 }
1274
1275 /// <summary>
1276 /// Extrudes a profile along a path.
1277 /// </summary>
1278 public void Extrude(PathType pathType)
1279 {
1280 bool needEndFaces = false;
1281
1282 this.coords = new List<Coord>();
1283 this.faces = new List<Face>();
1284
1285 int steps = 1;
1286
1287 float length = this.pathCutEnd - this.pathCutBegin;
1288
1289 this.hasProfileCut = this.profileEnd - this.profileStart < 0.9999f;
1290
1291 this.hasHollow = (this.hollow > 0.001f);
1292
1293 float twistBegin = this.twistBegin / 360.0f * twoPi;
1294 float twistEnd = this.twistEnd / 360.0f * twoPi;
1295 float twistTotal = twistEnd - twistBegin;
1296 float twistTotalAbs = Math.Abs(twistTotal);
1297 if (twistTotalAbs > 0.01f)
1298 steps += (int)(twistTotalAbs * 3.66); // dahlia's magic number
1299
1300 float hollow = this.hollow;
1301
1302 if (pathType == PathType.Circular)
1303 {
1304 needEndFaces = false;
1305 if (this.pathCutBegin != 0.0f || this.pathCutEnd != 1.0f)
1306 needEndFaces = true;
1307 else if (this.taperX != 0.0f || this.taperY != 0.0f)
1308 needEndFaces = true;
1309 else if (this.skew != 0.0f)
1310 needEndFaces = true;
1311 else if (twistTotal != 0.0f)
1312 needEndFaces = true;
1313 else if (this.radius != 0.0f)
1314 needEndFaces = true;
1315 }
1316 else needEndFaces = true;
1317
1318 // sanity checks
1319 float initialProfileRot = 0.0f;
1320 if (pathType == PathType.Circular)
1321 {
1322 if (this.sides == 3)
1323 {
1324 initialProfileRot = (float)Math.PI;
1325 if (this.hollowSides == 4)
1326 {
1327 if (hollow > 0.7f)
1328 hollow = 0.7f;
1329 hollow *= 0.707f;
1330 }
1331 else hollow *= 0.5f;
1332 }
1333 else if (this.sides == 4)
1334 {
1335 initialProfileRot = 0.25f * (float)Math.PI;
1336 if (this.hollowSides != 4)
1337 hollow *= 0.707f;
1338 }
1339 else if (this.sides > 4)
1340 {
1341 initialProfileRot = (float)Math.PI;
1342 if (this.hollowSides == 4)
1343 {
1344 if (hollow > 0.7f)
1345 hollow = 0.7f;
1346 hollow /= 0.7f;
1347 }
1348 }
1349 }
1350 else
1351 {
1352 if (this.sides == 3)
1353 {
1354 if (this.hollowSides == 4)
1355 {
1356 if (hollow > 0.7f)
1357 hollow = 0.7f;
1358 hollow *= 0.707f;
1359 }
1360 else hollow *= 0.5f;
1361 }
1362 else if (this.sides == 4)
1363 {
1364 initialProfileRot = 1.25f * (float)Math.PI;
1365 if (this.hollowSides != 4)
1366 hollow *= 0.707f;
1367 }
1368 else if (this.sides == 24 && this.hollowSides == 4)
1369 hollow *= 1.414f;
1370 }
1371
1372 Profile profile = new Profile(this.sides, this.profileStart, this.profileEnd, hollow, this.hollowSides, this.hasProfileCut,true);
1373 this.errorMessage = profile.errorMessage;
1374
1375 this.numPrimFaces = profile.numPrimFaces;
1376
1377 if (initialProfileRot != 0.0f)
1378 {
1379 profile.AddRot(new Quat(new Coord(0.0f, 0.0f, 1.0f), initialProfileRot));
1380 }
1381
1382 float thisV = 0.0f;
1383 float lastV = 0.0f;
1384
1385 Path path = new Path();
1386 path.twistBegin = twistBegin;
1387 path.twistEnd = twistEnd;
1388 path.topShearX = topShearX;
1389 path.topShearY = topShearY;
1390 path.pathCutBegin = pathCutBegin;
1391 path.pathCutEnd = pathCutEnd;
1392 path.dimpleBegin = dimpleBegin;
1393 path.dimpleEnd = dimpleEnd;
1394 path.skew = skew;
1395 path.holeSizeX = holeSizeX;
1396 path.holeSizeY = holeSizeY;
1397 path.taperX = taperX;
1398 path.taperY = taperY;
1399 path.radius = radius;
1400 path.revolutions = revolutions;
1401 path.stepsPerRevolution = stepsPerRevolution;
1402
1403 path.Create(pathType, steps);
1404
1405 int lastNode = path.pathNodes.Count -1;
1406
1407 for (int nodeIndex = 0; nodeIndex < path.pathNodes.Count; nodeIndex++)
1408 {
1409 PathNode node = path.pathNodes[nodeIndex];
1410 Profile newLayer = profile.Copy();
1411
1412 newLayer.Scale(node.xScale, node.yScale);
1413 newLayer.AddRot(node.rotation);
1414 newLayer.AddPos(node.position);
1415
1416 if (needEndFaces && nodeIndex == 0)
1417 {
1418 newLayer.FlipNormals();
1419 } // if (nodeIndex == 0)
1420
1421 // append this layer
1422
1423 int coordsLen = this.coords.Count;
1424 newLayer.AddValue2FaceVertexIndices(coordsLen);
1425
1426 this.coords.AddRange(newLayer.coords);
1427
1428 if (needEndFaces)
1429 {
1430 if (nodeIndex == 0)
1431 this.faces.AddRange(newLayer.faces);
1432 else if (nodeIndex == lastNode)
1433 {
1434 if (node.xScale > 1e-6 && node.yScale > 1e-6)
1435 this.faces.AddRange(newLayer.faces);
1436 }
1437 }
1438
1439 // fill faces between layers
1440
1441 int numVerts = newLayer.coords.Count;
1442 Face newFace1 = new Face();
1443 Face newFace2 = new Face();
1444
1445 thisV = 1.0f - node.percentOfPath;
1446
1447 if (nodeIndex > 0)
1448 {
1449 int startVert = coordsLen;
1450 int endVert = this.coords.Count;
1451 if (!this.hasProfileCut)
1452 {
1453 int i = startVert;
1454 for (int l = 0; l < profile.numOuterVerts - 1; l++)
1455 {
1456 newFace1.v1 = i;
1457 newFace1.v2 = i - numVerts;
1458 newFace1.v3 = i + 1;
1459 this.faces.Add(newFace1);
1460
1461 newFace2.v1 = i + 1;
1462 newFace2.v2 = i - numVerts;
1463 newFace2.v3 = i + 1 - numVerts;
1464 this.faces.Add(newFace2);
1465 i++;
1466 }
1467
1468 newFace1.v1 = i;
1469 newFace1.v2 = i - numVerts;
1470 newFace1.v3 = startVert;
1471 this.faces.Add(newFace1);
1472
1473 newFace2.v1 = startVert;
1474 newFace2.v2 = i - numVerts;
1475 newFace2.v3 = startVert - numVerts;
1476 this.faces.Add(newFace2);
1477
1478 if (this.hasHollow)
1479 {
1480 startVert = ++i;
1481 for (int l = 0; l < profile.numHollowVerts - 1; l++)
1482 {
1483 newFace1.v1 = i;
1484 newFace1.v2 = i - numVerts;
1485 newFace1.v3 = i + 1;
1486 this.faces.Add(newFace1);
1487
1488 newFace2.v1 = i + 1;
1489 newFace2.v2 = i - numVerts;
1490 newFace2.v3 = i + 1 - numVerts;
1491 this.faces.Add(newFace2);
1492 i++;
1493 }
1494
1495 newFace1.v1 = i;
1496 newFace1.v2 = i - numVerts;
1497 newFace1.v3 = startVert;
1498 this.faces.Add(newFace1);
1499
1500 newFace2.v1 = startVert;
1501 newFace2.v2 = i - numVerts;
1502 newFace2.v3 = startVert - numVerts;
1503 this.faces.Add(newFace2);
1504 }
1505
1506
1507 }
1508 else
1509 {
1510 for (int i = startVert; i < endVert; i++)
1511 {
1512 int iNext = i + 1;
1513 if (i == endVert - 1)
1514 iNext = startVert;
1515
1516 newFace1.v1 = i;
1517 newFace1.v2 = i - numVerts;
1518 newFace1.v3 = iNext;
1519 this.faces.Add(newFace1);
1520
1521 newFace2.v1 = iNext;
1522 newFace2.v2 = i - numVerts;
1523 newFace2.v3 = iNext - numVerts;
1524 this.faces.Add(newFace2);
1525
1526 }
1527 }
1528 }
1529
1530 lastV = thisV;
1531
1532 } // for (int nodeIndex = 0; nodeIndex < path.pathNodes.Count; nodeIndex++)
1533
1534 }
1535
1536
1537 /// <summary>
1538 /// DEPRICATED - use Extrude(PathType.Linear) instead
1539 /// Extrudes a profile along a straight line path. Used for prim types box, cylinder, and prism.
1540 /// </summary>
1541 ///
1542 public void ExtrudeLinear()
1543 {
1544 this.Extrude(PathType.Linear);
1545 }
1546
1547
1548 /// <summary>
1549 /// DEPRICATED - use Extrude(PathType.Circular) instead
1550 /// Extrude a profile into a circular path prim mesh. Used for prim types torus, tube, and ring.
1551 /// </summary>
1552 ///
1553 public void ExtrudeCircular()
1554 {
1555 this.Extrude(PathType.Circular);
1556 }
1557
1558
1559 private Coord SurfaceNormal(Coord c1, Coord c2, Coord c3)
1560 {
1561 Coord edge1 = new Coord(c2.X - c1.X, c2.Y - c1.Y, c2.Z - c1.Z);
1562 Coord edge2 = new Coord(c3.X - c1.X, c3.Y - c1.Y, c3.Z - c1.Z);
1563
1564 Coord normal = Coord.Cross(edge1, edge2);
1565
1566 normal.Normalize();
1567
1568 return normal;
1569 }
1570
1571 private Coord SurfaceNormal(Face face)
1572 {
1573 return SurfaceNormal(this.coords[face.v1], this.coords[face.v2], this.coords[face.v3]);
1574 }
1575
1576 /// <summary>
1577 /// Calculate the surface normal for a face in the list of faces
1578 /// </summary>
1579 /// <param name="faceIndex"></param>
1580 /// <returns></returns>
1581 public Coord SurfaceNormal(int faceIndex)
1582 {
1583 int numFaces = this.faces.Count;
1584 if (faceIndex < 0 || faceIndex >= numFaces)
1585 throw new Exception("faceIndex out of range");
1586
1587 return SurfaceNormal(this.faces[faceIndex]);
1588 }
1589
1590 /// <summary>
1591 /// Duplicates a PrimMesh object. All object properties are copied by value, including lists.
1592 /// </summary>
1593 /// <returns></returns>
1594 public PrimMesh Copy()
1595 {
1596 PrimMesh copy = new PrimMesh(this.sides, this.profileStart, this.profileEnd, this.hollow, this.hollowSides);
1597 copy.twistBegin = this.twistBegin;
1598 copy.twistEnd = this.twistEnd;
1599 copy.topShearX = this.topShearX;
1600 copy.topShearY = this.topShearY;
1601 copy.pathCutBegin = this.pathCutBegin;
1602 copy.pathCutEnd = this.pathCutEnd;
1603 copy.dimpleBegin = this.dimpleBegin;
1604 copy.dimpleEnd = this.dimpleEnd;
1605 copy.skew = this.skew;
1606 copy.holeSizeX = this.holeSizeX;
1607 copy.holeSizeY = this.holeSizeY;
1608 copy.taperX = this.taperX;
1609 copy.taperY = this.taperY;
1610 copy.radius = this.radius;
1611 copy.revolutions = this.revolutions;
1612 copy.stepsPerRevolution = this.stepsPerRevolution;
1613
1614 copy.numPrimFaces = this.numPrimFaces;
1615 copy.errorMessage = this.errorMessage;
1616
1617 copy.coords = new List<Coord>(this.coords);
1618 copy.faces = new List<Face>(this.faces);
1619
1620 return copy;
1621 }
1622
1623 /// <summary>
1624 /// Adds a value to each XYZ vertex coordinate in the mesh
1625 /// </summary>
1626 /// <param name="x"></param>
1627 /// <param name="y"></param>
1628 /// <param name="z"></param>
1629 public void AddPos(float x, float y, float z)
1630 {
1631 int i;
1632 int numVerts = this.coords.Count;
1633 Coord vert;
1634
1635 for (i = 0; i < numVerts; i++)
1636 {
1637 vert = this.coords[i];
1638 vert.X += x;
1639 vert.Y += y;
1640 vert.Z += z;
1641 this.coords[i] = vert;
1642 }
1643 }
1644
1645 /// <summary>
1646 /// Rotates the mesh
1647 /// </summary>
1648 /// <param name="q"></param>
1649 public void AddRot(Quat q)
1650 {
1651 int i;
1652 int numVerts = this.coords.Count;
1653
1654 for (i = 0; i < numVerts; i++)
1655 this.coords[i] *= q;
1656 }
1657
1658#if VERTEX_INDEXER
1659 public VertexIndexer GetVertexIndexer()
1660 {
1661 return null;
1662 }
1663#endif
1664
1665 /// <summary>
1666 /// Scales the mesh
1667 /// </summary>
1668 /// <param name="x"></param>
1669 /// <param name="y"></param>
1670 /// <param name="z"></param>
1671 public void Scale(float x, float y, float z)
1672 {
1673 int i;
1674 int numVerts = this.coords.Count;
1675 //Coord vert;
1676
1677 Coord m = new Coord(x, y, z);
1678 for (i = 0; i < numVerts; i++)
1679 this.coords[i] *= m;
1680 }
1681
1682 /// <summary>
1683 /// Dumps the mesh to a Blender compatible "Raw" format file
1684 /// </summary>
1685 /// <param name="path"></param>
1686 /// <param name="name"></param>
1687 /// <param name="title"></param>
1688 public void DumpRaw(String path, String name, String title)
1689 {
1690 if (path == null)
1691 return;
1692 String fileName = name + "_" + title + ".raw";
1693 String completePath = System.IO.Path.Combine(path, fileName);
1694 StreamWriter sw = new StreamWriter(completePath);
1695
1696 for (int i = 0; i < this.faces.Count; i++)
1697 {
1698 string s = this.coords[this.faces[i].v1].ToString();
1699 s += " " + this.coords[this.faces[i].v2].ToString();
1700 s += " " + this.coords[this.faces[i].v3].ToString();
1701
1702 sw.WriteLine(s);
1703 }
1704
1705 sw.Close();
1706 }
1707 }
1708}
generated by cgit v1.1 at 2024-07-07 15:48:51 +0000