/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * 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 OpenSim 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;
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 * 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.Reflection;
using System.Runtime.InteropServices;
using System.Threading;
using Axiom.Math;
using log4net;
using Ode.NET;
using OpenSim.Framework;
using OpenSim.Region.Physics.Manager;

namespace OpenSim.Region.Physics.OdePlugin
{
    /// <summary>
    /// Various properties that ODE uses for AMotors but isn't exposed in ODE.NET so we must define them ourselves.
    /// </summary>

    public class OdePrim : PhysicsActor
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        public PhysicsVector _position;
        private PhysicsVector _velocity;
        private PhysicsVector m_lastVelocity = new PhysicsVector(0.0f, 0.0f, 0.0f);
        private PhysicsVector m_lastposition = new PhysicsVector(0.0f, 0.0f, 0.0f);
        private PhysicsVector m_rotationalVelocity;
        private PhysicsVector _size;
        private PhysicsVector _acceleration;
        // private d.Vector3 _zeroPosition = new d.Vector3(0.0f, 0.0f, 0.0f);
        private Quaternion _orientation;
        private PhysicsVector m_taintposition;
        private PhysicsVector m_taintsize;
        private PhysicsVector m_taintVelocity = PhysicsVector.Zero;
        private Quaternion m_taintrot;
        private PhysicsVector m_angularlock = new PhysicsVector(1f, 1f, 1f);
        private PhysicsVector m_taintAngularLock = new PhysicsVector(1f, 1f, 1f);
        private IntPtr Amotor = IntPtr.Zero;

        private PhysicsVector m_PIDTarget = new PhysicsVector(0, 0, 0);
        private float m_PIDTau = 0f;
        private float PID_D = 35f;
        private float PID_G = 25f;
        private float m_tensor = 5f;
        private int body_autodisable_frames = 20;
        private IMesh primMesh = null;

        private bool m_usePID = false;

        private const CollisionCategories m_default_collisionFlags = (CollisionCategories.Geom
                                                        | CollisionCategories.Space
                                                        | CollisionCategories.Body
                                                        | CollisionCategories.Character
                                                        );
        private bool m_taintshape = false;
        private bool m_taintPhysics = false;
        private bool m_collidesLand = true;
        private bool m_collidesWater = false;
        public bool m_returnCollisions = false;

        // Default we're a Geometry
        private CollisionCategories m_collisionCategories = (CollisionCategories.Geom);

        // Default, Collide with Other Geometries, spaces and Bodies
        private CollisionCategories m_collisionFlags = m_default_collisionFlags;

        public bool m_taintremove = false;
        public bool m_taintdisable = false;
        public bool m_disabled = false;
        public bool m_taintadd = false;
        public bool m_taintselected = false;
        public bool m_taintCollidesWater = false;

        public uint m_localID = 0;

        //public GCHandle gc;
        private CollisionLocker ode;

        private bool m_taintforce = false;
        private List<PhysicsVector> m_forcelist = new List<PhysicsVector>();

        private IMesh _mesh;
        private PrimitiveBaseShape _pbs;
        private OdeScene _parent_scene;
        public IntPtr m_targetSpace = (IntPtr) 0;
        public IntPtr prim_geom;
        public IntPtr prev_geom;
        public IntPtr _triMeshData;

        private IntPtr _linkJointGroup = (IntPtr)0;
        private PhysicsActor _parent = null;
        private PhysicsActor m_taintparent = null;

        private bool iscolliding = false;
        private bool m_isphysical = false;
        private bool m_isSelected = false;

        private bool m_throttleUpdates = false;
        private int throttleCounter = 0;
        public int m_interpenetrationcount = 0;
        public float m_collisionscore = 0;
        public int m_roundsUnderMotionThreshold = 0;
        private int m_crossingfailures = 0;

        public float m_buoyancy = 0f;

        public bool outofBounds = false;
        private float m_density = 10.000006836f; // Aluminum g/cm3;

        public bool _zeroFlag = false;
        private bool m_lastUpdateSent = false;

        public IntPtr Body = (IntPtr) 0;
        private String m_primName;
        private PhysicsVector _target_velocity;
        public d.Mass pMass;

        public int m_eventsubscription = 0;
        private CollisionEventUpdate CollisionEventsThisFrame = null;

        private IntPtr m_linkJoint = (IntPtr)0;

        public OdePrim(String primName, OdeScene parent_scene, PhysicsVector pos, PhysicsVector size,
                       Quaternion rotation, IMesh mesh, PrimitiveBaseShape pbs, bool pisPhysical, CollisionLocker dode)
        {
            _target_velocity = new PhysicsVector(0, 0, 0);
            //gc = GCHandle.Alloc(prim_geom, GCHandleType.Pinned);
            ode = dode;
            _velocity = new PhysicsVector();
            _position = pos;
            m_taintposition = pos;
            PID_D = parent_scene.bodyPIDD;
            PID_G = parent_scene.bodyPIDG;
            m_density = parent_scene.geomDefaultDensity;
            m_tensor = parent_scene.bodyMotorJointMaxforceTensor;
            body_autodisable_frames = parent_scene.bodyFramesAutoDisable;
            //if (_position.X > 257)
            //{
                //_position.X = 257;
            //}
            //if (_position.X < 0)
            //{
                //_position.X = 0;
            //}
            //if (_position.Y > 257)
            //{
                //_position.Y = 257;
            //}
            //if (_position.Y < 0)
            //{
               // _position.Y = 0;
            //}

            prim_geom = (IntPtr)0;
            prev_geom = (IntPtr)0;

            if (size.X <= 0) size.X = 0.01f;
            if (size.Y <= 0) size.Y = 0.01f;
            if (size.Z <= 0) size.Z = 0.01f;

            _size = size;
            m_taintsize = _size;
            _acceleration = new PhysicsVector();
            m_rotationalVelocity = PhysicsVector.Zero;
            _orientation = rotation;
            m_taintrot = _orientation;
            _mesh = mesh;
            _pbs = pbs;

            _parent_scene = parent_scene;
            m_targetSpace = (IntPtr)0;

            if (pos.Z < 0)
                m_isphysical = false;
            else
            {
                m_isphysical = pisPhysical;
                // If we're physical, we need to be in the master space for now.
                // linksets *should* be in a space together..  but are not currently
                if (m_isphysical)
                    m_targetSpace = _parent_scene.space;
            }
            m_primName = primName;
            m_taintadd = true;
            _parent_scene.AddPhysicsActorTaint(this);
            //  don't do .add() here; old geoms get recycled with the same hash
        }

        public override int PhysicsActorType
        {
            get { return (int) ActorTypes.Prim; }
            set { return; }
        }

        public override bool SetAlwaysRun
        {
            get { return false; }
            set { return; }
        }

        public override uint LocalID
        {
            set {
                //m_log.Info("[PHYSICS]: Setting TrackerID: " + value);
                m_localID = value; }
        }

        public override bool Grabbed
        {
            set { return; }
        }

        public override bool Selected
        {
            set {
                // This only makes the object not collidable if the object
                // is physical or the object is modified somehow *IN THE FUTURE*
                // without this, if an avatar selects prim, they can walk right
                // through it while it's selected
                m_collisionscore = 0;
                if ((m_isphysical && !_zeroFlag) || !value)
                {
                    m_taintselected = value;
                    _parent_scene.AddPhysicsActorTaint(this);
                }
                else
                {
                    m_taintselected = value;
                    m_isSelected = value;
                }
            }
        }

        public void SetGeom(IntPtr geom)
        {
            prev_geom = prim_geom;
            prim_geom = geom;
            if (prim_geom != (IntPtr)0)
            {
                d.GeomSetCategoryBits(prim_geom, (int)m_collisionCategories);
                d.GeomSetCollideBits(prim_geom, (int)m_collisionFlags);
            }
            //m_log.Warn("Setting Geom to: " + prim_geom);
        }

        public void enableBodySoft()
        {
            if (m_isphysical && Body != (IntPtr)0)
                d.BodyEnable(Body);

            m_disabled = false;
        }

        public void disableBodySoft()
        {
            m_disabled = true;

            if (m_isphysical && Body != (IntPtr)0)
                d.BodyDisable(Body);
        }

        public void enableBody()
        {
            // Sets the geom to a body
            Body = d.BodyCreate(_parent_scene.world);

            setMass();
            d.BodySetPosition(Body, _position.X, _position.Y, _position.Z);
            d.Quaternion myrot = new d.Quaternion();
            myrot.W = _orientation.w;
            myrot.X = _orientation.x;
            myrot.Y = _orientation.y;
            myrot.Z = _orientation.z;
            d.BodySetQuaternion(Body, ref myrot);
            d.GeomSetBody(prim_geom, Body);
            m_collisionCategories |= CollisionCategories.Body;
            m_collisionFlags |= (CollisionCategories.Land | CollisionCategories.Wind);

            d.GeomSetCategoryBits(prim_geom, (int)m_collisionCategories);
            d.GeomSetCollideBits(prim_geom, (int)m_collisionFlags);

            d.BodySetAutoDisableFlag(Body, true);
            d.BodySetAutoDisableSteps(Body, body_autodisable_frames);

            m_interpenetrationcount = 0;
            m_collisionscore = 0;
            m_disabled = false;

            // The body doesn't already have a finite rotation mode set here
            if ((!m_angularlock.IsIdentical(PhysicsVector.Zero, 0)) && _parent == null)
            {
                createAMotor(m_angularlock);
            }

            _parent_scene.addActivePrim(this);
        }

        #region Mass Calculation

        private float CalculateMass()
        {
            float volume = 0;

            // No material is passed to the physics engines yet..  soo..
            // we're using the m_density constant in the class definition

            float returnMass = 0;

            switch (_pbs.ProfileShape)
            {
                case ProfileShape.Square:
                    // Profile Volume

                    volume = _size.X*_size.Y*_size.Z;

                    // If the user has 'hollowed out'
                    // ProfileHollow is one of those 0 to 50000 values :P
                    // we like percentages better..   so turning into a percentage

                    if (((float) _pbs.ProfileHollow/50000f) > 0.0)
                    {
                        float hollowAmount = (float) _pbs.ProfileHollow/50000f;

                        // calculate the hollow volume by it's shape compared to the prim shape
                        float hollowVolume = 0;
                        switch (_pbs.HollowShape)
                        {
                            case HollowShape.Square:
                            case HollowShape.Same:
                                // Cube Hollow volume calculation
                                float hollowsizex = _size.X*hollowAmount;
                                float hollowsizey = _size.Y*hollowAmount;
                                float hollowsizez = _size.Z*hollowAmount;
                                hollowVolume = hollowsizex*hollowsizey*hollowsizez;
                                break;

                            case HollowShape.Circle:
                                // Hollow shape is a perfect cyllinder in respect to the cube's scale
                                // Cyllinder hollow volume calculation
                                float hRadius = _size.X/2;
                                float hLength = _size.Z;

                                // pi * r2 * h
                                hollowVolume = ((float) (Math.PI*Math.Pow(hRadius, 2)*hLength)*hollowAmount);
                                break;

                            case HollowShape.Triangle:
                                // Equilateral Triangular Prism volume hollow calculation
                                // Triangle is an Equilateral Triangular Prism with aLength = to _size.Y

                                float aLength = _size.Y;
                                // 1/2 abh
                                hollowVolume = (float) ((0.5*aLength*_size.X*_size.Z)*hollowAmount);
                                break;

                            default:
                                hollowVolume = 0;
                                break;
                        }
                        volume = volume - hollowVolume;
                    }

                    break;
                case ProfileShape.Circle:
                    if (_pbs.PathCurve == (byte)Extrusion.Straight)
                    {
                        // Cylinder
                        float volume1 = (float)(Math.PI * Math.Pow(_size.X/2, 2) * _size.Z);
                        float volume2 = (float)(Math.PI * Math.Pow(_size.Y/2, 2) * _size.Z);

                        // Approximating the cylinder's irregularity.
                        if (volume1 > volume2)
                        {
                            volume = (float)volume1 - (volume1 - volume2);
                        }
                        else if (volume2 > volume1)
                        {
                            volume = (float)volume2 - (volume2 - volume1);
                        }
                        else
                        {
                            // Regular cylinder
                            volume = volume1;
                        }
                    }
                    else
                    {
                        // We don't know what the shape is yet, so use default
                        volume = _size.X * _size.Y * _size.Z;
                    }
                    // If the user has 'hollowed out'
                    // ProfileHollow is one of those 0 to 50000 values :P
                    // we like percentages better..   so turning into a percentage

                    if (((float)_pbs.ProfileHollow / 50000f) > 0.0)
                    {
                        float hollowAmount = (float)_pbs.ProfileHollow / 50000f;

                        // calculate the hollow volume by it's shape compared to the prim shape
                        float hollowVolume = 0;
                        switch (_pbs.HollowShape)
                        {
                            case HollowShape.Same:
                            case HollowShape.Circle:
                                // Hollow shape is a perfect cyllinder in respect to the cube's scale
                                // Cyllinder hollow volume calculation
                                float hRadius = _size.X / 2;
                                float hLength = _size.Z;

                                // pi * r2 * h
                                hollowVolume = ((float)(Math.PI * Math.Pow(hRadius, 2) * hLength) * hollowAmount);
                                break;

                            case HollowShape.Square:
                                // Cube Hollow volume calculation
                                float hollowsizex = _size.X * hollowAmount;
                                float hollowsizey = _size.Y * hollowAmount;
                                float hollowsizez = _size.Z * hollowAmount;
                                hollowVolume = hollowsizex * hollowsizey * hollowsizez;
                                break;

                            case HollowShape.Triangle:
                                // Equilateral Triangular Prism volume hollow calculation
                                // Triangle is an Equilateral Triangular Prism with aLength = to _size.Y

                                float aLength = _size.Y;
                                // 1/2 abh
                                hollowVolume = (float)((0.5 * aLength * _size.X * _size.Z) * hollowAmount);
                                break;

                            default:
                                hollowVolume = 0;
                                break;
                        }
                        volume = volume - hollowVolume;
                    }
                    break;

                case ProfileShape.HalfCircle:
                    if (_pbs.PathCurve == (byte)Extrusion.Curve1)
                    {
                        if (_size.X == _size.Z && _size.Z == _size.X)
                        {
                            // regular sphere
                            // v = 4/3 * pi * r^3
                            float sradius3 = (float)Math.Pow((_size.X / 2), 3);
                            volume = (float)((4 / 3) * Math.PI * sradius3);
                        }
                        else
                        {
                            // we treat this as a box currently
                            volume = _size.X * _size.Y * _size.Z;
                        }
                    }
                    else
                    {
                        // We don't know what the shape is yet, so use default
                        volume = _size.X * _size.Y * _size.Z;
                    }
                    break;

                case ProfileShape.EquilateralTriangle:
                    /*
                        v = (abs((xB*yA-xA*yB)+(xC*yB-xB*yC)+(xA*yC-xC*yA))/2) * h

                        // seed mesh
                        Vertex MM = new Vertex(-0.25f, -0.45f, 0.0f);
                        Vertex PM = new Vertex(+0.5f, 0f, 0.0f);
                        Vertex PP = new Vertex(-0.25f, +0.45f, 0.0f);
                     */
                    float xA = -0.25f * _size.X;
                    float yA = -0.45f * _size.Y;

                    float xB = 0.5f * _size.X;
                    float yB = 0;

                    float xC = -0.25f * _size.X;
                    float yC = 0.45f * _size.Y;

                    volume = (float)((Math.Abs((xB * yA - xA * yB) + (xC * yB - xB * yC) + (xA * yC - xC * yA)) / 2) * _size.Z);

                    // If the user has 'hollowed out'
                    // ProfileHollow is one of those 0 to 50000 values :P
                    // we like percentages better..   so turning into a percentage
                    float fhollowFactor = ((float)_pbs.ProfileHollow / 1.9f);
                    if (((float)fhollowFactor / 50000f) > 0.0)
                    {
                        float hollowAmount = (float)fhollowFactor / 50000f;

                        // calculate the hollow volume by it's shape compared to the prim shape
                        float hollowVolume = 0;
                        switch (_pbs.HollowShape)
                        {
                            case HollowShape.Same:
                            case HollowShape.Triangle:
                                // Equilateral Triangular Prism volume hollow calculation
                                // Triangle is an Equilateral Triangular Prism with aLength = to _size.Y

                                float aLength = _size.Y;
                                // 1/2 abh
                                hollowVolume = (float)((0.5 * aLength * _size.X * _size.Z) * hollowAmount);
                                break;

                            case HollowShape.Square:
                                // Cube Hollow volume calculation
                                float hollowsizex = _size.X * hollowAmount;
                                float hollowsizey = _size.Y * hollowAmount;
                                float hollowsizez = _size.Z * hollowAmount;
                                hollowVolume = hollowsizex * hollowsizey * hollowsizez;
                                break;

                            case HollowShape.Circle:
                                // Hollow shape is a perfect cyllinder in respect to the cube's scale
                                // Cyllinder hollow volume calculation
                                float hRadius = _size.X / 2;
                                float hLength = _size.Z;

                                // pi * r2 * h
                                hollowVolume = ((float)((Math.PI * Math.Pow(hRadius, 2) * hLength)/2) * hollowAmount);
                                break;

                            default:
                                hollowVolume = 0;
                                break;
                        }
                        volume = volume - hollowVolume;
                    }
                    break;

                default:
                    // we don't have all of the volume formulas yet so
                    // use the common volume formula for all
                    volume = _size.X*_size.Y*_size.Z;
                    break;
            }

            // Calculate Path cut effect on volume
            // Not exact, in the triangle hollow example
            // They should never be zero or less then zero..
            // we'll ignore it if it's less then zero

            // ProfileEnd and ProfileBegin are values
            // from 0 to 50000

            // Turning them back into percentages so that I can cut that percentage off the volume

            float PathCutEndAmount = _pbs.ProfileEnd;
            float PathCutStartAmount = _pbs.ProfileBegin;
            if (((PathCutStartAmount + PathCutEndAmount)/50000f) > 0.0f)
            {
                float pathCutAmount = ((PathCutStartAmount + PathCutEndAmount)/50000f);

                // Check the return amount for sanity
                if (pathCutAmount >= 0.99f)
                    pathCutAmount = 0.99f;

                volume = volume - (volume*pathCutAmount);
            }
            UInt16 taperX = _pbs.PathScaleX;
            UInt16 taperY = _pbs.PathScaleY;
            float taperFactorX = 0;
            float taperFactorY = 0;

            // Mass = density * volume
            if (taperX != 100)
            {
                if (taperX > 100)
                {
                    taperFactorX = 1.0f - ((float)taperX / 200);
                    //m_log.Warn("taperTopFactorX: " + extr.taperTopFactorX.ToString());
                }
                else
                {
                    taperFactorX = 1.0f - ((100 - (float)taperX) / 100);
                    //m_log.Warn("taperBotFactorX: " + extr.taperBotFactorX.ToString());
                }
                volume = (float)volume * ((taperFactorX / 3f) + 0.001f);
            }

            if (taperY != 100)
            {
                if (taperY > 100)
                {
                    taperFactorY = 1.0f - ((float)taperY / 200);
                    //m_log.Warn("taperTopFactorY: " + extr.taperTopFactorY.ToString());
                }
                else
                {
                    taperFactorY = 1.0f - ((100 - (float)taperY) / 100);
                    //m_log.Warn("taperBotFactorY: " + extr.taperBotFactorY.ToString());
                }
                volume = (float)volume * ((taperFactorY / 3f) + 0.001f);
            }
            returnMass = m_density*volume;

            return returnMass;
        }

        #endregion

        public void setMass()
        {
            if (Body != (IntPtr) 0)
            {
                float newmass = CalculateMass();
                //m_log.Info("[PHYSICS]: New Mass: " + newmass.ToString());

                if (newmass <= 0) newmass = 0.0001f;
                d.MassSetBoxTotal(out pMass, newmass, _size.X, _size.Y, _size.Z);
                d.BodySetMass(Body, ref pMass);
            }
        }

        public void disableBody()
        {
            //this kills the body so things like 'mesh' can re-create it.
            lock (this)
            {
                if (Body != (IntPtr)0)
                {
                    m_collisionCategories &= ~CollisionCategories.Body;
                    m_collisionFlags &= ~(CollisionCategories.Wind | CollisionCategories.Land);

                    if (prim_geom != (IntPtr)0)
                    {
                        d.GeomSetCategoryBits(prim_geom, (int)m_collisionCategories);
                        d.GeomSetCollideBits(prim_geom, (int)m_collisionFlags);
                    }

                    _parent_scene.remActivePrim(this);
                    d.BodyDestroy(Body);
                    Body = (IntPtr)0;
                }
            }
            m_disabled = true;
            m_collisionscore = 0;
        }

        public void setMesh(OdeScene parent_scene, IMesh mesh)
        {
            // This sleeper is there to moderate how long it takes between
            // setting up the mesh and pre-processing it when we get rapid fire mesh requests on a single object

            Thread.Sleep(10);

            //Kill Body so that mesh can re-make the geom
            if (IsPhysical && Body != (IntPtr) 0)
            {
                disableBody();
            }

            IMesh oldMesh = primMesh;

            primMesh = mesh;

            float[] vertexList = primMesh.getVertexListAsFloatLocked(); // Note, that vertextList is pinned in memory
            int[] indexList = primMesh.getIndexListAsIntLocked(); // Also pinned, needs release after usage

            int VertexCount = vertexList.GetLength(0)/3;
            int IndexCount = indexList.GetLength(0);

            _triMeshData = d.GeomTriMeshDataCreate();

            d.GeomTriMeshDataBuildSimple(_triMeshData, vertexList, 3*sizeof (float), VertexCount, indexList, IndexCount,
                                         3*sizeof (int));
            d.GeomTriMeshDataPreprocess(_triMeshData);

            _parent_scene.waitForSpaceUnlock(m_targetSpace);

            try
            {
                if (prim_geom == (IntPtr)0)
                {
                    SetGeom(d.CreateTriMesh(m_targetSpace, _triMeshData, parent_scene.triCallback, null, null));
                }
            }
            catch (AccessViolationException)
            {
                m_log.Error("[PHYSICS]: MESH LOCKED");
                return;
            }

            if (oldMesh != null)
            {
                oldMesh.releasePinned();
                oldMesh = null;
            }

            if (IsPhysical && Body == (IntPtr) 0)
            {
                // Recreate the body
                m_interpenetrationcount = 0;
                m_collisionscore = 0;

                enableBody();
            }
        }

        public void ProcessTaints(float timestep)
        {
            if (m_taintadd)
            {
                changeadd(timestep);
            }
            if (prim_geom != (IntPtr)0)
            {
                if (!_position.IsIdentical(m_taintposition,0f))
                    changemove(timestep);

                if (m_taintrot != _orientation)
                    rotate(timestep);
                //

                if (m_taintPhysics != m_isphysical)
                    changePhysicsStatus(timestep);
                //

                if (!_size.IsIdentical(m_taintsize,0))
                    changesize(timestep);
                //

                if (m_taintshape)
                    changeshape(timestep);
                //

                if (m_taintforce)
                    changeAddForce(timestep);

                if (m_taintdisable)
                    changedisable(timestep);

                if (m_taintselected != m_isSelected)
                    changeSelectedStatus(timestep);

                if (!m_taintVelocity.IsIdentical(PhysicsVector.Zero,0))
                    changevelocity(timestep);

                if (m_taintparent != _parent)
                    changelink(timestep);

                if (m_taintCollidesWater != m_collidesWater)
                    changefloatonwater(timestep);

                if (!m_angularlock.IsIdentical(m_taintAngularLock,0))
                    changeAngularLock(timestep);
            }
            else
            {
                m_log.Error("[PHYSICS]: The scene reused a disposed PhysActor! *waves finger*, Don't be evil.");
            }
        }

        private void changeAngularLock(float timestep)
        {
            // do we have a Physical object?
            if (Body != IntPtr.Zero)
            {
                //Check that we have a Parent
                //If we have a parent then we're not authorative here
                if (_parent == null)
                {
                    if (!m_taintAngularLock.IsIdentical(new PhysicsVector(1f,1f,1f), 0))
                    {
                        //d.BodySetFiniteRotationMode(Body, 0);
                        //d.BodySetFiniteRotationAxis(Body,m_taintAngularLock.X,m_taintAngularLock.Y,m_taintAngularLock.Z);
                        createAMotor(m_taintAngularLock);
                    }
                    else
                    {
                        if (Amotor != IntPtr.Zero)
                        {
                            d.JointDestroy(Amotor);
                            Amotor = (IntPtr)0;
                        }
                    }
                }
            }
            // Store this for later in case we get turned into a separate body
            m_angularlock = new PhysicsVector(m_taintAngularLock.X,m_angularlock.Y,m_angularlock.Z);
        }

        private void changelink(float timestep)
        {
            if (_parent == null && m_taintparent != null)
            {
                if (m_taintparent.PhysicsActorType == (int)ActorTypes.Prim)
                {
                    OdePrim obj = (OdePrim)m_taintparent;
                    if (obj.Body != (IntPtr)0 && Body != (IntPtr)0 && obj.Body != Body)
                    {
                        _linkJointGroup = d.JointGroupCreate(0);
                        m_linkJoint = d.JointCreateFixed(_parent_scene.world, _linkJointGroup);
                        d.JointAttach(m_linkJoint, obj.Body, Body);
                        d.JointSetFixed(m_linkJoint);
                    }
                }
            }
            else if (_parent != null && m_taintparent == null)
            {
                if (Body != (IntPtr)0 && _linkJointGroup != (IntPtr)0)
                    d.JointGroupDestroy(_linkJointGroup);

                _linkJointGroup = (IntPtr)0;
                m_linkJoint = (IntPtr)0;
            }

            _parent = m_taintparent;
        }

        private void changeSelectedStatus(float timestep)
        {
            if (m_taintselected)
            {
                m_collisionCategories = CollisionCategories.Selected;
                m_collisionFlags = (CollisionCategories.Sensor | CollisionCategories.Space);

                // We do the body disable soft twice because 'in theory' a collision could have happened
                // in between the disabling and the collision properties setting
                // which would wake the physical body up from a soft disabling and potentially cause it to fall
                // through the ground.

                if (m_isphysical)
                {
                    disableBodySoft();
                }

                if (prim_geom != (IntPtr)0)
                {
                    d.GeomSetCategoryBits(prim_geom, (int)m_collisionCategories);
                    d.GeomSetCollideBits(prim_geom, (int)m_collisionFlags);
                }

                if (m_isphysical)
                {
                    disableBodySoft();
                }
            }
            else
            {
                m_collisionCategories = CollisionCategories.Geom;

                if (m_isphysical)
                    m_collisionCategories |= CollisionCategories.Body;

                m_collisionFlags = m_default_collisionFlags;

                if (m_collidesLand)
                    m_collisionFlags |= CollisionCategories.Land;
                if (m_collidesWater)
                    m_collisionFlags |= CollisionCategories.Water;

                if (prim_geom != (IntPtr)0)
                {
                    d.GeomSetCategoryBits(prim_geom, (int)m_collisionCategories);
                    d.GeomSetCollideBits(prim_geom, (int)m_collisionFlags);
                }
                if (m_isphysical)
                {
                    if (Body != IntPtr.Zero)
                    {
                        d.BodySetLinearVel(Body, 0f, 0f, 0f);
                        enableBodySoft();
                    }
                }
            }

            resetCollisionAccounting();
            m_isSelected = m_taintselected;
        }

        public void ResetTaints()
        {
            m_taintposition = _position;
            m_taintrot = _orientation;
            m_taintPhysics = m_isphysical;
            m_taintselected = m_isSelected;
            m_taintsize = _size;
            m_taintshape = false;
            m_taintforce = false;
            m_taintdisable = false;
            m_taintVelocity = PhysicsVector.Zero;
        }

        public void changeadd(float timestep)
        {
            int[] iprimspaceArrItem = _parent_scene.calculateSpaceArrayItemFromPos(_position);
            IntPtr targetspace = _parent_scene.calculateSpaceForGeom(_position);

            if (targetspace == IntPtr.Zero)
                targetspace = _parent_scene.createprimspace(iprimspaceArrItem[0], iprimspaceArrItem[1]);

            m_targetSpace = targetspace;

            //if (_mesh == null)
            //{
            //    if (_parent_scene.needsMeshing(_pbs))
            //    {
            //        // Don't need to re-enable body..   it's done in SetMesh
            //        _mesh = _parent_scene.mesher.CreateMesh(m_primName, _pbs, _size, _parent_scene.meshSculptLOD, IsPhysical);
            //        // createmesh returns null when it's a shape that isn't a cube.
            //    }
            //}

            if (_mesh == null )
                _mesh = _parent_scene.mesher.CreateMesh(m_primName, _pbs, _size, _parent_scene.meshSculptLOD, IsPhysical);


            lock (OdeScene.OdeLock)
            {
                if (_mesh != null)
                {
                    setMesh(_parent_scene, _mesh);
                }
                else
                {
                    if (_pbs.ProfileShape == ProfileShape.HalfCircle && _pbs.PathCurve == (byte)Extrusion.Curve1)
                    {
                        if (_size.X == _size.Y && _size.Y == _size.Z && _size.X == _size.Z)
                        {
                            if (((_size.X / 2f) > 0f))
                            {
                                _parent_scene.waitForSpaceUnlock(m_targetSpace);
                                try
                                {
                                    SetGeom(d.CreateSphere(m_targetSpace, _size.X / 2));
                                }
                                catch (AccessViolationException)
                                {
                                    m_log.Warn("[PHYSICS]: Unable to create physics proxy for object");
                                    ode.dunlock(_parent_scene.world);
                                    return;
                                }
                            }
                            else
                            {
                                _parent_scene.waitForSpaceUnlock(m_targetSpace);
                                try
                                {
                                    SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                                }
                                catch (AccessViolationException)
                                {
                                    m_log.Warn("[PHYSICS]: Unable to create physics proxy for object");
                                    ode.dunlock(_parent_scene.world);
                                    return;
                                }
                            }
                        }
                        else
                        {
                            _parent_scene.waitForSpaceUnlock(m_targetSpace);
                            try
                            {
                               SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                            }
                            catch (AccessViolationException)
                            {
                                m_log.Warn("[PHYSICS]: Unable to create physics proxy for object");
                                ode.dunlock(_parent_scene.world);
                                return;
                            }
                        }
                    }
                    //else if (pbs.ProfileShape == ProfileShape.Circle && pbs.PathCurve == (byte)Extrusion.Straight)
                    //{
                    //Cyllinder
                    //if (_size.X == _size.Y)
                    //{
                    //prim_geom = d.CreateCylinder(m_targetSpace, _size.X / 2, _size.Z);
                    //}
                    //else
                    //{
                    //prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z);
                    //}
                    //}
                    else
                    {
                        _parent_scene.waitForSpaceUnlock(m_targetSpace);
                        try
                        {
                            SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                        }
                        catch (AccessViolationException)
                        {
                            m_log.Warn("[PHYSICS]: Unable to create physics proxy for object");
                            ode.dunlock(_parent_scene.world);
                            return;
                        }
                    }
                }
                if (prim_geom != (IntPtr) 0)
                {
                    d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
                    d.Quaternion myrot = new d.Quaternion();
                    myrot.W = _orientation.w;
                    myrot.X = _orientation.x;
                    myrot.Y = _orientation.y;
                    myrot.Z = _orientation.z;
                    d.GeomSetQuaternion(prim_geom, ref myrot);
                }

                if (m_isphysical && Body == (IntPtr)0)
                {
                    enableBody();
                }
            }

            _parent_scene.geom_name_map[prim_geom] = this.m_primName;
            _parent_scene.actor_name_map[prim_geom] = (PhysicsActor)this;

            changeSelectedStatus(timestep);

            m_taintadd = false;
        }

        public void changemove(float timestep)
        {
            if (m_isphysical)
            {
                // This is a fallback..   May no longer be necessary.
                if (Body == (IntPtr) 0)
                    enableBody();
                //Prim auto disable after 20 frames,
                //if you move it, re-enable the prim manually.
                if (_parent != null)
                {
                    if (m_linkJoint != (IntPtr)0)
                    {
                        d.JointDestroy(m_linkJoint);
                        m_linkJoint = (IntPtr)0;
                    }
                }
                d.BodySetPosition(Body, _position.X, _position.Y, _position.Z);
                if (_parent != null)
                {
                    OdePrim odParent = (OdePrim)_parent;
                    if (Body != (IntPtr)0 && odParent.Body != (IntPtr)0 && Body != odParent.Body)
                    {
                        m_linkJoint = d.JointCreateFixed(_parent_scene.world, _linkJointGroup);
                        d.JointAttach(m_linkJoint, Body, odParent.Body);
                        d.JointSetFixed(m_linkJoint);
                    }
                }
                d.BodyEnable(Body);
            }
            else
            {
                // string primScenAvatarIn = _parent_scene.whichspaceamIin(_position);
                // int[] arrayitem = _parent_scene.calculateSpaceArrayItemFromPos(_position);
                _parent_scene.waitForSpaceUnlock(m_targetSpace);

                IntPtr tempspace = _parent_scene.recalculateSpaceForGeom(prim_geom, _position, m_targetSpace);
                m_targetSpace = tempspace;

                _parent_scene.waitForSpaceUnlock(m_targetSpace);
                if (prim_geom != (IntPtr) 0)
                {
                    d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);

                    _parent_scene.waitForSpaceUnlock(m_targetSpace);
                    d.SpaceAdd(m_targetSpace, prim_geom);
                }
            }

            changeSelectedStatus(timestep);

            resetCollisionAccounting();
            m_taintposition = _position;
        }

        public void Move(float timestep)
        {
            float fx = 0;
            float fy = 0;
            float fz = 0;

            if (IsPhysical && Body != (IntPtr)0 && !m_isSelected)
            {
                //float PID_P = 900.0f;

                float m_mass = CalculateMass();

                fz = 0f;
                    //m_log.Info(m_collisionFlags.ToString());

                if (m_buoyancy != 0)
                {
                    if (m_buoyancy > 0)
                    {
                         fz = (((-1 * _parent_scene.gravityz) * m_buoyancy) * m_mass);

                        //d.Vector3 l_velocity = d.BodyGetLinearVel(Body);
                         //m_log.Info("Using Buoyancy: " + buoyancy + " G: " + (_parent_scene.gravityz * m_buoyancy) + "mass:" + m_mass + "  Pos: " + Position.ToString());
                    }
                    else
                    {
                        fz = (-1 * (((-1 * _parent_scene.gravityz) * (-1 * m_buoyancy)) * m_mass));
                    }
                }

                if (m_usePID)
                {
                    // If we're using the PID controller, then we have no gravity
                    fz = (-1 * _parent_scene.gravityz) * this.Mass;

                    //  no lock; for now it's only called from within Simulate()

                    // If the PID Controller isn't active then we set our force
                    // calculating base velocity to the current position

                    if ((m_PIDTau < 1))
                    {
                        PID_G = PID_G / m_PIDTau;
                    }

                    if ((PID_G - m_PIDTau) <= 0)
                    {
                        PID_G = m_PIDTau + 1;
                    }
                    //PidStatus = true;

                    // PhysicsVector vec = new PhysicsVector();
                    d.Vector3 vel = d.BodyGetLinearVel(Body);

                    d.Vector3 pos = d.BodyGetPosition(Body);
                    _target_velocity =
                        new PhysicsVector(
                            (m_PIDTarget.X - pos.X) * ((PID_G - m_PIDTau) * timestep),
                            (m_PIDTarget.Y - pos.Y) * ((PID_G - m_PIDTau) * timestep),
                            (m_PIDTarget.Z - pos.Z) * ((PID_G - m_PIDTau) * timestep)
                            );

                    //  if velocity is zero, use position control; otherwise, velocity control

                    if (_target_velocity.IsIdentical(PhysicsVector.Zero,0.1f))
                    {
                        //  keep track of where we stopped.  No more slippin' & slidin'

                        // We only want to deactivate the PID Controller if we think we want to have our surrogate
                        // react to the physics scene by moving it's position.
                        // Avatar to Avatar collisions
                        // Prim to avatar collisions

                        //fx = (_target_velocity.X - vel.X) * (PID_D) + (_zeroPosition.X - pos.X) * (PID_P * 2);
                        //fy = (_target_velocity.Y - vel.Y) * (PID_D) + (_zeroPosition.Y - pos.Y) * (PID_P * 2);
                        //fz = fz + (_target_velocity.Z - vel.Z) * (PID_D) + (_zeroPosition.Z - pos.Z) * PID_P;
                        d.BodySetPosition(Body, m_PIDTarget.X, m_PIDTarget.Y, m_PIDTarget.Z);
                        d.BodySetLinearVel(Body, 0, 0, 0);
                        d.BodyAddForce(Body, 0, 0, fz);
                        return;
                    }
                    else
                    {
                        _zeroFlag = false;

                        // We're flying and colliding with something
                        fx = ((_target_velocity.X) - vel.X) * (PID_D);
                        fy = ((_target_velocity.Y) - vel.Y) * (PID_D);

                        // vec.Z = (_target_velocity.Z - vel.Z) * PID_D + (_zeroPosition.Z - pos.Z) * PID_P;

                        fz = fz + ((_target_velocity.Z - vel.Z) * (PID_D) * m_mass);
                    }
                }

                fx *= m_mass;
                fy *= m_mass;
                //fz *= m_mass;

                //m_log.Info("[OBJPID]: X:" + fx.ToString() + " Y:" + fy.ToString() + " Z:" + fz.ToString());
                if (fx != 0 || fy != 0 || fz != 0)
                {
                    //m_taintdisable = true;
                    //base.RaiseOutOfBounds(Position);
                    //d.BodySetLinearVel(Body, fx, fy, 0f);
                    enableBodySoft();
                    d.BodyAddForce(Body, fx, fy, fz);
                }
            }
            else
            {
                // _zeroPosition = d.BodyGetPosition(Body);
                return;
            }
        }

        public void rotate(float timestep)
        {
            d.Quaternion myrot = new d.Quaternion();
            myrot.W = _orientation.w;
            myrot.X = _orientation.x;
            myrot.Y = _orientation.y;
            myrot.Z = _orientation.z;
            d.GeomSetQuaternion(prim_geom, ref myrot);
            if (m_isphysical && Body != (IntPtr) 0)
            {
                d.BodySetQuaternion(Body, ref myrot);
                if (!m_angularlock.IsIdentical(new PhysicsVector(1, 1, 1), 0))
                    createAMotor(m_angularlock);
            }

            resetCollisionAccounting();
            m_taintrot = _orientation;
        }

        private void resetCollisionAccounting()
        {
            m_collisionscore = 0;
            m_interpenetrationcount = 0;
            m_disabled = false;
        }

        public void changedisable(float timestep)
        {
            m_disabled = true;
            if (Body != (IntPtr)0)
            {
                d.BodyDisable(Body);
                Body = (IntPtr)0;
            }

            m_taintdisable = false;
        }

        public void changePhysicsStatus(float timestep)
        {
            if (m_isphysical == true)
            {
                if (Body == (IntPtr)0)
                {
                    if (_pbs.SculptEntry && _parent_scene.meshSculptedPrim)
                    {
                        changeshape(2f);
                    }
                    else
                    {
                        enableBody();
                    }
                }
            }
            else
            {
                if (Body != (IntPtr)0)
                {
                    if (_pbs.SculptEntry && _parent_scene.meshSculptedPrim)
                    {
                        if (prim_geom != IntPtr.Zero)
                            d.GeomDestroy(prim_geom);

                        changeadd(2f);
                    }
                    disableBody();
                }
            }

            changeSelectedStatus(timestep);

            resetCollisionAccounting();
            m_taintPhysics = m_isphysical;
        }

        public void changesize(float timestamp)
        {
            //if (!_parent_scene.geom_name_map.ContainsKey(prim_geom))
            //{
            // m_taintsize = _size;
            //return;
            //}
            string oldname = _parent_scene.geom_name_map[prim_geom];

            if (_size.X <= 0) _size.X = 0.01f;
            if (_size.Y <= 0) _size.Y = 0.01f;
            if (_size.Z <= 0) _size.Z = 0.01f;

            // Cleanup of old prim geometry
            if (_mesh != null)
            {
                // Cleanup meshing here
            }
            //kill body to rebuild
            if (IsPhysical && Body != (IntPtr)0)
            {
                disableBody();
            }
            if (d.SpaceQuery(m_targetSpace, prim_geom))
            {
                _parent_scene.waitForSpaceUnlock(m_targetSpace);
                d.SpaceRemove(m_targetSpace, prim_geom);
            }
            d.GeomDestroy(prim_geom);
            prim_geom = (IntPtr)0;
            // we don't need to do space calculation because the client sends a position update also.

            // Construction of new prim
            //if (_parent_scene.needsMeshing(_pbs))
            {
                float meshlod = _parent_scene.meshSculptLOD;

                if (IsPhysical)
                    meshlod = _parent_scene.MeshSculptphysicalLOD;
                // Don't need to re-enable body..   it's done in SetMesh
                IMesh mesh = _parent_scene.mesher.CreateMesh(oldname, _pbs, _size, meshlod, IsPhysical);

                if (mesh != null)
                {
                    setMesh(_parent_scene, mesh);
                    d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
                    d.Quaternion myrot = new d.Quaternion();
                    myrot.W = _orientation.w;
                    myrot.X = _orientation.x;
                    myrot.Y = _orientation.y;
                    myrot.Z = _orientation.z;
                    d.GeomSetQuaternion(prim_geom, ref myrot);

                    //d.GeomBoxSetLengths(prim_geom, _size.X, _size.Y, _size.Z);
                    if (IsPhysical && Body == (IntPtr)0)
                    {
                        // Re creates body on size.
                        // EnableBody also does setMass()
                        enableBody();
                        d.BodyEnable(Body);
                    }
                }
                else
                {
                    if (_pbs.ProfileShape == ProfileShape.HalfCircle && _pbs.PathCurve == (byte)Extrusion.Curve1)
                    {
                        if (_size.X == _size.Y && _size.Y == _size.Z && _size.X == _size.Z)
                        {
                            if (((_size.X / 2f) > 0f) && ((_size.X / 2f) < 1000))
                            {
                                _parent_scene.waitForSpaceUnlock(m_targetSpace);
                                SetGeom(d.CreateSphere(m_targetSpace, _size.X / 2));
                            }
                            else
                            {
                                m_log.Info("[PHYSICS]: Failed to load a sphere bad size");
                                _parent_scene.waitForSpaceUnlock(m_targetSpace);
                                SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                            }

                        }
                        else
                        {
                            _parent_scene.waitForSpaceUnlock(m_targetSpace);
                            SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                        }
                    }

                    else
                    {
                        _parent_scene.waitForSpaceUnlock(m_targetSpace);
                        SetGeom(prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                    }
                    //prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z);
                    d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
                    d.Quaternion myrot = new d.Quaternion();
                    myrot.W = _orientation.w;
                    myrot.X = _orientation.x;
                    myrot.Y = _orientation.y;
                    myrot.Z = _orientation.z;
                    d.GeomSetQuaternion(prim_geom, ref myrot);
                }
            }

            _parent_scene.geom_name_map[prim_geom] = oldname;

            changeSelectedStatus(timestamp);

            resetCollisionAccounting();
            m_taintsize = _size;
        }

        //public void changesize(float timestamp)
        //{
        //    //if (!_parent_scene.geom_name_map.ContainsKey(prim_geom))
        //    //{
        //       // m_taintsize = _size;
        //        //return;
        //    //}
        //    string oldname = _parent_scene.geom_name_map[prim_geom];

        //    if (_size.X <= 0) _size.X = 0.01f;
        //    if (_size.Y <= 0) _size.Y = 0.01f;
        //    if (_size.Z <= 0) _size.Z = 0.01f;

        //    // Cleanup of old prim geometry
        //    if (_mesh != null)
        //    {
        //        // Cleanup meshing here
        //    }
        //    //kill body to rebuild
        //    if (IsPhysical && Body != (IntPtr) 0)
        //    {
        //        disableBody();
        //    }
        //    if (d.SpaceQuery(m_targetSpace, prim_geom))
        //    {
        //        _parent_scene.waitForSpaceUnlock(m_targetSpace);
        //        d.SpaceRemove(m_targetSpace, prim_geom);
        //    }
        //    d.GeomDestroy(prim_geom);
        //    prim_geom = (IntPtr)0;
        //    // we don't need to do space calculation because the client sends a position update also.

        //    // Construction of new prim
        //    if (_parent_scene.needsMeshing(_pbs))
        //    {
        //        float meshlod = _parent_scene.meshSculptLOD;

        //        if (IsPhysical)
        //            meshlod = _parent_scene.MeshSculptphysicalLOD;
        //        // Don't need to re-enable body..   it's done in SetMesh
        //        IMesh mesh = _parent_scene.mesher.CreateMesh(oldname, _pbs, _size, meshlod, IsPhysical);
        //        // createmesh returns null when it's a shape that isn't a cube.
        //        if (mesh != null)
        //        {
        //            setMesh(_parent_scene, mesh);
        //            d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
        //            d.Quaternion myrot = new d.Quaternion();
        //            myrot.W = _orientation.w;
        //            myrot.X = _orientation.x;
        //            myrot.Y = _orientation.y;
        //            myrot.Z = _orientation.z;
        //            d.GeomSetQuaternion(prim_geom, ref myrot);

        //            //d.GeomBoxSetLengths(prim_geom, _size.X, _size.Y, _size.Z);
        //            if (IsPhysical && Body == (IntPtr)0)
        //            {
        //                // Re creates body on size.
        //                // EnableBody also does setMass()
        //                enableBody();
        //                d.BodyEnable(Body);
        //            }
        //        }
        //        else
        //        {
        //            if (_pbs.ProfileShape == ProfileShape.HalfCircle && _pbs.PathCurve == (byte)Extrusion.Curve1)
        //            {
        //                if (_size.X == _size.Y && _size.Y == _size.Z && _size.X == _size.Z)
        //                {
        //                    if (((_size.X / 2f) > 0f) && ((_size.X / 2f) < 1000))
        //                    {
        //                        _parent_scene.waitForSpaceUnlock(m_targetSpace);
        //                        SetGeom(d.CreateSphere(m_targetSpace, _size.X / 2));
        //                    }
        //                    else
        //                    {
        //                        m_log.Info("[PHYSICS]: Failed to load a sphere bad size");
        //                        _parent_scene.waitForSpaceUnlock(m_targetSpace);
        //                        SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
        //                    }

        //                }
        //                else
        //                {
        //                    _parent_scene.waitForSpaceUnlock(m_targetSpace);
        //                    SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
        //                }
        //            }
        //            //else if (_pbs.ProfileShape == ProfileShape.Circle && _pbs.PathCurve == (byte)Extrusion.Straight)
        //            //{
        //                //Cyllinder
        //                //if (_size.X == _size.Y)
        //                //{
        //                //    prim_geom = d.CreateCylinder(m_targetSpace, _size.X / 2, _size.Z);
        //                //}
        //                //else
        //                //{
        //                    //prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z);
        //                //}
        //            //}
        //            else
        //            {
        //                _parent_scene.waitForSpaceUnlock(m_targetSpace);
        //                SetGeom(prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
        //            }
        //            //prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z);
        //            d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
        //            d.Quaternion myrot = new d.Quaternion();
        //            myrot.W = _orientation.w;
        //            myrot.X = _orientation.x;
        //            myrot.Y = _orientation.y;
        //            myrot.Z = _orientation.z;
        //            d.GeomSetQuaternion(prim_geom, ref myrot);
        //        }
        //    }
        //    else
        //    {
        //        if (_pbs.ProfileShape == ProfileShape.HalfCircle && _pbs.PathCurve == (byte)Extrusion.Curve1)
        //        {
        //            if (_size.X == _size.Y && _size.Y == _size.Z && _size.X == _size.Z)
        //            {
        //                _parent_scene.waitForSpaceUnlock(m_targetSpace);
        //                SetGeom(d.CreateSphere(m_targetSpace, _size.X / 2));
        //            }
        //            else
        //            {
        //                _parent_scene.waitForSpaceUnlock(m_targetSpace);
        //                SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
        //            }
        //        }
        //        //else if (_pbs.ProfileShape == ProfileShape.Circle && _pbs.PathCurve == (byte)Extrusion.Straight)
        //        //{
        //            //Cyllinder
        //            //if (_size.X == _size.Y)
        //            //{
        //                //prim_geom = d.CreateCylinder(m_targetSpace, _size.X / 2, _size.Z);
        //            //}
        //            //else
        //            //{
        //                //prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z);
        //            //}
        //        //}
        //        else
        //        {
        //            _parent_scene.waitForSpaceUnlock(m_targetSpace);
        //            SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
        //        }
        //        d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
        //        d.Quaternion myrot = new d.Quaternion();
        //        myrot.W = _orientation.w;
        //        myrot.X = _orientation.x;
        //        myrot.Y = _orientation.y;
        //        myrot.Z = _orientation.z;
        //        d.GeomSetQuaternion(prim_geom, ref myrot);

        //        //d.GeomBoxSetLengths(prim_geom, _size.X, _size.Y, _size.Z);
        //        if (IsPhysical && Body == (IntPtr) 0)
        //        {
        //            // Re creates body on size.
        //            // EnableBody also does setMass()
        //            enableBody();
        //            d.BodyEnable(Body);
        //        }
        //    }

        //    _parent_scene.geom_name_map[prim_geom] = oldname;

        //    changeSelectedStatus(timestamp);

        //    resetCollisionAccounting();
        //    m_taintsize = _size;
        //}

        public void changefloatonwater(float timestep)
        {
            m_collidesWater = m_taintCollidesWater;

            if (prim_geom != (IntPtr)0)
            {
                if (m_collidesWater)
                {
                    m_collisionFlags |= CollisionCategories.Water;
                }
                else
                {
                    m_collisionFlags &= ~CollisionCategories.Water;
                }
                d.GeomSetCollideBits(prim_geom, (int)m_collisionFlags);
            }
        }

        public void changeshape(float timestamp)
        {
            string oldname = _parent_scene.geom_name_map[prim_geom];

            // Cleanup of old prim geometry and Bodies
            if (IsPhysical && Body != (IntPtr) 0)
            {
                disableBody();
            }
            d.GeomDestroy(prim_geom);
            prim_geom = (IntPtr) 0;
            // we don't need to do space calculation because the client sends a position update also.
            if (_size.X <= 0) _size.X = 0.01f;
            if (_size.Y <= 0) _size.Y = 0.01f;
            if (_size.Z <= 0) _size.Z = 0.01f;
            // Construction of new prim

            //if (_parent_scene.needsMeshing(_pbs))
            {
                // Don't need to re-enable body..   it's done in SetMesh
                float meshlod = _parent_scene.meshSculptLOD;

                if (IsPhysical)
                    meshlod = _parent_scene.MeshSculptphysicalLOD;

                IMesh mesh = _parent_scene.mesher.CreateMesh(oldname, _pbs, _size, meshlod, IsPhysical);
                // createmesh returns null when it's a shape that isn't a cube.
                if (mesh != null)
                {
                    setMesh(_parent_scene, mesh);
                    d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
                    d.Quaternion myrot = new d.Quaternion();
                    myrot.W = _orientation.w;
                    myrot.X = _orientation.x;
                    myrot.Y = _orientation.y;
                    myrot.Z = _orientation.z;
                    d.GeomSetQuaternion(prim_geom, ref myrot);

                    //d.GeomBoxSetLengths(prim_geom, _size.X, _size.Y, _size.Z);
                    if (IsPhysical && Body == (IntPtr)0)
                    {
                        // Re creates body on size.
                        // EnableBody also does setMass()
                        enableBody();
                    }
                }
                else
                {
                    if (_pbs.ProfileShape == ProfileShape.HalfCircle && _pbs.PathCurve == (byte)Extrusion.Curve1)
                    {
                        if (_size.X == _size.Y && _size.Y == _size.Z && _size.X == _size.Z)
                        {
                            if (((_size.X / 2f) > 0f) && ((_size.X / 2f) < 1000))
                            {
                                _parent_scene.waitForSpaceUnlock(m_targetSpace);
                                SetGeom(d.CreateSphere(m_targetSpace, _size.X / 2));
                            }
                            else
                            {
                                m_log.Info("[PHYSICS]: Failed to load a sphere bad size");
                                _parent_scene.waitForSpaceUnlock(m_targetSpace);
                                SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                            }
                        }
                        else
                        {
                            _parent_scene.waitForSpaceUnlock(m_targetSpace);
                            SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                        }
                    }
                    //else if (_pbs.ProfileShape == ProfileShape.Circle && _pbs.PathCurve == (byte)Extrusion.Straight)
                    //{
                    //Cyllinder
                    //if (_size.X == _size.Y)
                    //{
                    //    prim_geom = d.CreateCylinder(m_targetSpace, _size.X / 2, _size.Z);
                    //}
                    //else
                    //{
                    //prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z);
                    //}
                    //}
                    else
                    {
                        _parent_scene.waitForSpaceUnlock(m_targetSpace);
                        SetGeom(prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
                    }
                    //prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z);
                    d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
                    d.Quaternion myrot = new d.Quaternion();
                    myrot.W = _orientation.w;
                    myrot.X = _orientation.x;
                    myrot.Y = _orientation.y;
                    myrot.Z = _orientation.z;
                    d.GeomSetQuaternion(prim_geom, ref myrot);
                }
            }
            //else
            //{
            //    if (_pbs.ProfileShape == ProfileShape.HalfCircle && _pbs.PathCurve == (byte)Extrusion.Curve1)
            //    {
            //        if (_size.X == _size.Y && _size.Y == _size.Z && _size.X == _size.Z)
            //        {
            //            _parent_scene.waitForSpaceUnlock(m_targetSpace);
            //            SetGeom(d.CreateSphere(m_targetSpace, _size.X / 2));
            //        }
            //        else
            //        {
            //            _parent_scene.waitForSpaceUnlock(m_targetSpace);
            //            SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
            //        }
            //    }
            //    //else if (_pbs.ProfileShape == ProfileShape.Circle && _pbs.PathCurve == (byte)Extrusion.Straight)
            //    //{
            //    //Cyllinder
            //    //if (_size.X == _size.Y)
            //    //{
            //    //prim_geom = d.CreateCylinder(m_targetSpace, _size.X / 2, _size.Z);
            //    //}
            //    //else
            //    //{
            //    //prim_geom = d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z);
            //    //}
            //    //}
            //    else
            //    {
            //        _parent_scene.waitForSpaceUnlock(m_targetSpace);
            //        SetGeom(d.CreateBox(m_targetSpace, _size.X, _size.Y, _size.Z));
            //    }
            //    d.GeomSetPosition(prim_geom, _position.X, _position.Y, _position.Z);
            //    d.Quaternion myrot = new d.Quaternion();
            //    myrot.W = _orientation.w;
            //    myrot.X = _orientation.x;
            //    myrot.Y = _orientation.y;
            //    myrot.Z = _orientation.z;
            //    d.GeomSetQuaternion(prim_geom, ref myrot);

            //    //d.GeomBoxSetLengths(prim_geom, _size.X, _size.Y, _size.Z);
            //    if (IsPhysical && Body == (IntPtr)0)
            //    {
            //        // Re creates body on size.
            //        // EnableBody also does setMass()
            //        enableBody();
            //        d.BodyEnable(Body);
            //    }
            //}

            _parent_scene.geom_name_map[prim_geom] = oldname;

            changeSelectedStatus(timestamp);

            resetCollisionAccounting();
            m_taintshape = false;
        }

        public void changeAddForce(float timestamp)
        {
            if (!m_isSelected)
            {
                lock (m_forcelist)
                {
                    //m_log.Info("[PHYSICS]: dequeing forcelist");
                    if (IsPhysical)
                    {
                        PhysicsVector iforce = new PhysicsVector();
                        for (int i = 0; i < m_forcelist.Count; i++)
                        {
                            iforce = iforce + (m_forcelist[i] * 100);
                        }
                        d.BodyEnable(Body);
                        d.BodyAddForce(Body, iforce.X, iforce.Y, iforce.Z);
                    }
                    m_forcelist.Clear();
                }

                m_collisionscore = 0;
                m_interpenetrationcount = 0;
            }
            m_taintforce = false;

        }

        private void changevelocity(float timestep)
        {
            if (!m_isSelected)
            {
                Thread.Sleep(20);
                if (IsPhysical)
                {
                    if (Body != (IntPtr)0)
                    {
                        d.BodySetLinearVel(Body, m_taintVelocity.X, m_taintVelocity.Y, m_taintVelocity.Z);
                    }
                }

                //resetCollisionAccounting();
            }
            m_taintVelocity = PhysicsVector.Zero;
        }

        public override bool IsPhysical
        {
            get { return m_isphysical; }
            set { m_isphysical = value; }
        }

        public void setPrimForRemoval()
        {
            m_taintremove = true;
        }

        public override bool Flying
        {
            // no flying prims for you
            get { return false; }
            set { }
        }

        public override bool IsColliding
        {
            get { return iscolliding; }
            set { iscolliding = value; }
        }

        public override bool CollidingGround
        {
            get { return false; }
            set { return; }
        }

        public override bool CollidingObj
        {
            get { return false; }
            set { return; }
        }

        public override bool ThrottleUpdates
        {
            get { return m_throttleUpdates; }
            set { m_throttleUpdates = value; }
        }

        public override bool Stopped
        {
            get { return _zeroFlag; }
        }

        public override PhysicsVector Position
        {
            get { return _position; }

            set { _position = value;
                //m_log.Info("[PHYSICS]: " + _position.ToString());
            }
        }

        public override PhysicsVector Size
        {
            get { return _size; }
            set { _size = value; }
        }

        public override float Mass
        {
            get { return CalculateMass(); }
        }

        public override PhysicsVector Force
        {
            get { return PhysicsVector.Zero; }
        }

        public override PhysicsVector CenterOfMass
        {
            get { return PhysicsVector.Zero; }
        }

        public override PhysicsVector GeometricCenter
        {
            get { return PhysicsVector.Zero; }
        }

        public override PrimitiveBaseShape Shape
        {
            set
            {
                _pbs = value;
                m_taintshape = true;
            }
        }

        public override PhysicsVector Velocity
        {
            get
            {
                // Averate previous velocity with the new one so
                // client object interpolation works a 'little' better
                PhysicsVector returnVelocity = new PhysicsVector();
                returnVelocity.X = (m_lastVelocity.X + _velocity.X)/2;
                returnVelocity.Y = (m_lastVelocity.Y + _velocity.Y)/2;
                returnVelocity.Z = (m_lastVelocity.Z + _velocity.Z)/2;
                return returnVelocity;
            }
            set
            {
                _velocity = value;

                m_taintVelocity = value;
                _parent_scene.AddPhysicsActorTaint(this);
            }
        }

        public override float CollisionScore
        {
            get { return m_collisionscore; }
            set { m_collisionscore = value; }
        }

        public override bool Kinematic
        {
            get { return false; }
            set { }
        }

        public override Quaternion Orientation
        {
            get { return _orientation; }
            set { _orientation = value; }
        }

        public override PhysicsVector Acceleration
        {
            get { return _acceleration; }
        }


        public void SetAcceleration(PhysicsVector accel)
        {
            _acceleration = accel;
        }

        public override void AddForce(PhysicsVector force, bool pushforce)
        {
            m_forcelist.Add(force);
            m_taintforce = true;
            //m_log.Info("[PHYSICS]: Added Force:" + force.ToString() +  " to prim at " + Position.ToString());
        }

        public override PhysicsVector RotationalVelocity
        {
            get
            {
                PhysicsVector pv = new PhysicsVector(0, 0, 0);
                if (_zeroFlag)
                    return pv;
                m_lastUpdateSent = false;

                if (m_rotationalVelocity.IsIdentical(pv, 0.2f))
                    return pv;

                return m_rotationalVelocity;
            }
            set { m_rotationalVelocity = value; }
        }

        public override void CrossingFailure()
        {
            m_crossingfailures++;
            if (m_crossingfailures > _parent_scene.geomCrossingFailuresBeforeOutofbounds)
            {
                base.RaiseOutOfBounds(_position);
                return;
            }
            else if (m_crossingfailures == _parent_scene.geomCrossingFailuresBeforeOutofbounds)
            {
                m_log.Warn("[PHYSICS]: Too many crossing failures for: " + m_primName);
            }
        }

        public override float Buoyancy
        {
            get { return m_buoyancy; }
            set { m_buoyancy = value; }
        }

        public override void link(PhysicsActor obj)
        {
            m_taintparent = obj;
        }

        public override void delink()
        {
            m_taintparent = null;
        }

        public override void LockAngularMotion(PhysicsVector axis)
        {
            // reverse the zero/non zero values for ODE.

            axis.X = (axis.X > 0) ? 1f : 0f;
            axis.Y = (axis.Y > 0) ? 1f : 0f;
            axis.Z = (axis.Z > 0) ? 1f : 0f;
            m_taintAngularLock = new PhysicsVector(axis.X, axis.Y, axis.Z); ;
        }

        public void UpdatePositionAndVelocity()
        {
            //  no lock; called from Simulate() -- if you call this from elsewhere, gotta lock or do Monitor.Enter/Exit!
            if (_parent == null)
            {
                PhysicsVector pv = new PhysicsVector(0, 0, 0);
                bool lastZeroFlag = _zeroFlag;
                if (Body != (IntPtr)0)
                {
                    d.Vector3 vec = d.BodyGetPosition(Body);
                    d.Quaternion ori = d.BodyGetQuaternion(Body);
                    d.Vector3 vel = d.BodyGetLinearVel(Body);
                    d.Vector3 rotvel = d.BodyGetAngularVel(Body);

                    PhysicsVector l_position = new PhysicsVector();

                    //  kluge to keep things in bounds.  ODE lets dead avatars drift away (they should be removed!)
                    //if (vec.X < 0.0f) { vec.X = 0.0f; if (Body != (IntPtr)0) d.BodySetAngularVel(Body, 0, 0, 0); }
                    //if (vec.Y < 0.0f) { vec.Y = 0.0f; if (Body != (IntPtr)0) d.BodySetAngularVel(Body, 0, 0, 0); }
                    //if (vec.X > 255.95f) { vec.X = 255.95f; if (Body != (IntPtr)0) d.BodySetAngularVel(Body, 0, 0, 0); }
                    //if (vec.Y > 255.95f) { vec.Y = 255.95f; if (Body != (IntPtr)0) d.BodySetAngularVel(Body, 0, 0, 0); }

                    m_lastposition = _position;

                    l_position.X = vec.X;
                    l_position.Y = vec.Y;
                    l_position.Z = vec.Z;

                    if (l_position.X > 255.95f || l_position.X < 0f || l_position.Y > 255.95f || l_position.Y < 0f)
                    {
                        //base.RaiseOutOfBounds(l_position);

                        if (m_crossingfailures < _parent_scene.geomCrossingFailuresBeforeOutofbounds)
                        {
                            _position = l_position;
                            //_parent_scene.remActivePrim(this);
                            if (_parent == null)
                                base.RequestPhysicsterseUpdate();
                            return;
                        }
                        else
                        {
                            if (_parent == null)
                                base.RaiseOutOfBounds(l_position);
                            return;
                        }
                    }

                    if (l_position.Z < 0)
                    {
                        // This is so prim that get lost underground don't fall forever and suck up
                        //
                        // Sim resources and memory.
                        // Disables the prim's movement physics....
                        // It's a hack and will generate a console message if it fails.

                        //IsPhysical = false;
                        if (_parent == null)
                            base.RaiseOutOfBounds(_position);

                        _acceleration.X = 0;
                        _acceleration.Y = 0;
                        _acceleration.Z = 0;

                        _velocity.X = 0;
                        _velocity.Y = 0;
                        _velocity.Z = 0;
                        m_rotationalVelocity.X = 0;
                        m_rotationalVelocity.Y = 0;
                        m_rotationalVelocity.Z = 0;

                        if (_parent == null)
                            base.RequestPhysicsterseUpdate();

                        m_throttleUpdates = false;
                        throttleCounter = 0;
                        _zeroFlag = true;
                        //outofBounds = true;
                    }

                    if ((Math.Abs(m_lastposition.X - l_position.X) < 0.02)
                        && (Math.Abs(m_lastposition.Y - l_position.Y) < 0.02)
                        && (Math.Abs(m_lastposition.Z - l_position.Z) < 0.02))
                    {
                        _zeroFlag = true;
                        m_throttleUpdates = false;
                    }
                    else
                    {
                        //System.Console.WriteLine(Math.Abs(m_lastposition.X - l_position.X).ToString());
                        _zeroFlag = false;
                    }

                    if (_zeroFlag)
                    {
                        _velocity.X = 0.0f;
                        _velocity.Y = 0.0f;
                        _velocity.Z = 0.0f;

                        _acceleration.X = 0;
                        _acceleration.Y = 0;
                        _acceleration.Z = 0;

                        //_orientation.w = 0f;
                        //_orientation.x = 0f;
                        //_orientation.y = 0f;
                        //_orientation.z = 0f;
                        m_rotationalVelocity.X = 0;
                        m_rotationalVelocity.Y = 0;
                        m_rotationalVelocity.Z = 0;
                        if (!m_lastUpdateSent)
                        {
                            m_throttleUpdates = false;
                            throttleCounter = 0;
                            m_rotationalVelocity = pv;

                            if (_parent == null)
                                base.RequestPhysicsterseUpdate();

                            m_lastUpdateSent = true;
                        }
                    }
                    else
                    {
                        if (lastZeroFlag != _zeroFlag)
                        {
                            if (_parent == null)
                                base.RequestPhysicsterseUpdate();
                        }

                        m_lastVelocity = _velocity;

                        _position = l_position;

                        _velocity.X = vel.X;
                        _velocity.Y = vel.Y;
                        _velocity.Z = vel.Z;

                        _acceleration = ((_velocity - m_lastVelocity) / 0.1f);
                        _acceleration = new PhysicsVector(_velocity.X - m_lastVelocity.X / 0.1f, _velocity.Y - m_lastVelocity.Y / 0.1f, _velocity.Z - m_lastVelocity.Z / 0.1f);
                        //m_log.Info("[PHYSICS]: V1: " + _velocity + " V2: " + m_lastVelocity + " Acceleration: " + _acceleration.ToString());

                        if (_velocity.IsIdentical(pv, 0.5f))
                        {
                            m_rotationalVelocity = pv;
                        }
                        else
                        {
                            m_rotationalVelocity.setValues(rotvel.X, rotvel.Y, rotvel.Z);
                        }

                        //System.Console.WriteLine("ODE: " + m_rotationalVelocity.ToString());
                        _orientation.w = ori.W;
                        _orientation.x = ori.X;
                        _orientation.y = ori.Y;
                        _orientation.z = ori.Z;
                        m_lastUpdateSent = false;
                        if (!m_throttleUpdates || throttleCounter > _parent_scene.geomUpdatesPerThrottledUpdate)
                        {
                            if (_parent == null)
                                base.RequestPhysicsterseUpdate();
                        }
                        else
                        {
                            throttleCounter++;
                        }
                    }
                    m_lastposition = l_position;
                }
                else
                {
                    // Not a body..   so Make sure the client isn't interpolating
                    _velocity.X = 0;
                    _velocity.Y = 0;
                    _velocity.Z = 0;

                    _acceleration.X = 0;
                    _acceleration.Y = 0;
                    _acceleration.Z = 0;

                    m_rotationalVelocity.X = 0;
                    m_rotationalVelocity.Y = 0;
                    m_rotationalVelocity.Z = 0;
                    _zeroFlag = true;
                }
            }
        }

        public override bool FloatOnWater
        {
            set {
                m_taintCollidesWater = value;
                _parent_scene.AddPhysicsActorTaint(this);
            }
        }

        public override void SetMomentum(PhysicsVector momentum)
        {
        }

        public override PhysicsVector PIDTarget { set { m_PIDTarget = value; ; } }
        public override bool PIDActive { set { m_usePID = value; } }
        public override float PIDTau { set { m_PIDTau = value; } }

        private void createAMotor(PhysicsVector axis)
        {
            if (Body == IntPtr.Zero)
                return;

            if (Amotor != IntPtr.Zero)
            {
                d.JointDestroy(Amotor);
                Amotor = IntPtr.Zero;
            }

            float axisnum = 3;

            axisnum = (axisnum - (axis.X + axis.Y + axis.Z));

            if (axisnum <= 0)
                return;
            int dAMotorEuler = 1;

            Amotor = d.JointCreateAMotor(_parent_scene.world, IntPtr.Zero);
            d.JointAttach(Amotor, Body, IntPtr.Zero);
            d.JointSetAMotorMode(Amotor, dAMotorEuler);

            d.JointSetAMotorNumAxes(Amotor,(int)axisnum);
            int i = 0;

            if (axis.X == 0)
            {
                d.JointSetAMotorAxis(Amotor, i, 0, 1, 0, 0);
                i++;
            }

            if (axis.Y == 0)
            {
                d.JointSetAMotorAxis(Amotor, i, 0, 0, 1, 0);
                i++;
            }

            if (axis.Z == 0)
            {
                d.JointSetAMotorAxis(Amotor, i, 0, 0, 0, 1);
                i++;
            }

            for (int j = 0; j < (int)axisnum; j++)
            {
                //d.JointSetAMotorAngle(Amotor, j, 0);
            }

            //d.JointSetAMotorAngle(Amotor, 1, 0);
            //d.JointSetAMotorAngle(Amotor, 2, 0);

            // These lowstops and high stops are effectively (no wiggle room)
            d.JointSetAMotorParam(Amotor, (int)dParam.LowStop, -0.000000000001f);
            d.JointSetAMotorParam(Amotor, (int)dParam.LoStop3, -0.000000000001f);
            d.JointSetAMotorParam(Amotor, (int)dParam.LoStop2, -0.000000000001f);
            d.JointSetAMotorParam(Amotor, (int)dParam.HiStop, 0.000000000001f);
            d.JointSetAMotorParam(Amotor, (int)dParam.HiStop3, 0.000000000001f);
            d.JointSetAMotorParam(Amotor, (int)dParam.HiStop2, 0.000000000001f);

            d.JointSetAMotorParam(Amotor, (int)dParam.FudgeFactor, 0f);
            d.JointSetAMotorParam(Amotor, (int)dParam.FMax, m_tensor);
        }

        public override void SubscribeEvents(int ms)
        {
            m_eventsubscription = ms;
            _parent_scene.addCollisionEventReporting(this);
        }

        public override void UnSubscribeEvents()
        {
            _parent_scene.remCollisionEventReporting(this);
            m_eventsubscription = 0;
        }

        public void AddCollisionEvent(uint CollidedWith, float depth)
        {
            if (CollisionEventsThisFrame == null)
                CollisionEventsThisFrame = new CollisionEventUpdate();
            CollisionEventsThisFrame.addCollider(CollidedWith,depth);
        }

        public void SendCollisions()
        {
            if (CollisionEventsThisFrame == null)
                return;

            //if (CollisionEventsThisFrame.m_objCollisionList == null)
            //    return;

            if (CollisionEventsThisFrame.m_objCollisionList.Count > 0)
            {
                base.SendCollisionUpdate(CollisionEventsThisFrame);
                CollisionEventsThisFrame = new CollisionEventUpdate();
            }
        }

        public override bool SubscribedEvents()
        {
            if (m_eventsubscription > 0)
                return true;
            return false;
        }
    }
}