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Diffstat (limited to 'thirdparty/bullet/BulletCollision/CollisionShapes/btTriangleMeshShape.cpp')
| -rw-r--r-- | thirdparty/bullet/BulletCollision/CollisionShapes/btTriangleMeshShape.cpp | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/thirdparty/bullet/BulletCollision/CollisionShapes/btTriangleMeshShape.cpp b/thirdparty/bullet/BulletCollision/CollisionShapes/btTriangleMeshShape.cpp new file mode 100644 index 0000000000..0e17951405 --- /dev/null +++ b/thirdparty/bullet/BulletCollision/CollisionShapes/btTriangleMeshShape.cpp @@ -0,0 +1,207 @@ +/* +Bullet Continuous Collision Detection and Physics Library +Copyright (c) 2003-2009 Erwin Coumans http://bulletphysics.org + +This software is provided 'as-is', without any express or implied warranty. +In no event will the authors be held liable for any damages arising from the use of this software. +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it freely, +subject to the following restrictions: + +1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. +2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. +3. This notice may not be removed or altered from any source distribution. +*/ + +#include "btTriangleMeshShape.h" +#include "LinearMath/btVector3.h" +#include "LinearMath/btQuaternion.h" +#include "btStridingMeshInterface.h" +#include "LinearMath/btAabbUtil2.h" +#include "BulletCollision/CollisionShapes/btCollisionMargin.h" + + +btTriangleMeshShape::btTriangleMeshShape(btStridingMeshInterface* meshInterface) +: btConcaveShape (), m_meshInterface(meshInterface) +{ + m_shapeType = TRIANGLE_MESH_SHAPE_PROXYTYPE; + if(meshInterface->hasPremadeAabb()) + { + meshInterface->getPremadeAabb(&m_localAabbMin, &m_localAabbMax); + } + else + { + recalcLocalAabb(); + } +} + + +btTriangleMeshShape::~btTriangleMeshShape() +{ + +} + + + + +void btTriangleMeshShape::getAabb(const btTransform& trans,btVector3& aabbMin,btVector3& aabbMax) const +{ + + btVector3 localHalfExtents = btScalar(0.5)*(m_localAabbMax-m_localAabbMin); + localHalfExtents += btVector3(getMargin(),getMargin(),getMargin()); + btVector3 localCenter = btScalar(0.5)*(m_localAabbMax+m_localAabbMin); + + btMatrix3x3 abs_b = trans.getBasis().absolute(); + + btVector3 center = trans(localCenter); + + btVector3 extent = localHalfExtents.dot3(abs_b[0], abs_b[1], abs_b[2]); + aabbMin = center - extent; + aabbMax = center + extent; +} + +void btTriangleMeshShape::recalcLocalAabb() +{ + for (int i=0;i<3;i++) + { + btVector3 vec(btScalar(0.),btScalar(0.),btScalar(0.)); + vec[i] = btScalar(1.); + btVector3 tmp = localGetSupportingVertex(vec); + m_localAabbMax[i] = tmp[i]+m_collisionMargin; + vec[i] = btScalar(-1.); + tmp = localGetSupportingVertex(vec); + m_localAabbMin[i] = tmp[i]-m_collisionMargin; + } +} + + + +class SupportVertexCallback : public btTriangleCallback +{ + + btVector3 m_supportVertexLocal; +public: + + btTransform m_worldTrans; + btScalar m_maxDot; + btVector3 m_supportVecLocal; + + SupportVertexCallback(const btVector3& supportVecWorld,const btTransform& trans) + : m_supportVertexLocal(btScalar(0.),btScalar(0.),btScalar(0.)), m_worldTrans(trans) ,m_maxDot(btScalar(-BT_LARGE_FLOAT)) + + { + m_supportVecLocal = supportVecWorld * m_worldTrans.getBasis(); + } + + virtual void processTriangle( btVector3* triangle,int partId, int triangleIndex) + { + (void)partId; + (void)triangleIndex; + for (int i=0;i<3;i++) + { + btScalar dot = m_supportVecLocal.dot(triangle[i]); + if (dot > m_maxDot) + { + m_maxDot = dot; + m_supportVertexLocal = triangle[i]; + } + } + } + + btVector3 GetSupportVertexWorldSpace() + { + return m_worldTrans(m_supportVertexLocal); + } + + btVector3 GetSupportVertexLocal() + { + return m_supportVertexLocal; + } + +}; + + +void btTriangleMeshShape::setLocalScaling(const btVector3& scaling) +{ + m_meshInterface->setScaling(scaling); + recalcLocalAabb(); +} + +const btVector3& btTriangleMeshShape::getLocalScaling() const +{ + return m_meshInterface->getScaling(); +} + + + + + + +//#define DEBUG_TRIANGLE_MESH + + + +void btTriangleMeshShape::processAllTriangles(btTriangleCallback* callback,const btVector3& aabbMin,const btVector3& aabbMax) const +{ + struct FilteredCallback : public btInternalTriangleIndexCallback + { + btTriangleCallback* m_callback; + btVector3 m_aabbMin; + btVector3 m_aabbMax; + + FilteredCallback(btTriangleCallback* callback,const btVector3& aabbMin,const btVector3& aabbMax) + :m_callback(callback), + m_aabbMin(aabbMin), + m_aabbMax(aabbMax) + { + } + + virtual void internalProcessTriangleIndex(btVector3* triangle,int partId,int triangleIndex) + { + if (TestTriangleAgainstAabb2(&triangle[0],m_aabbMin,m_aabbMax)) + { + //check aabb in triangle-space, before doing this + m_callback->processTriangle(triangle,partId,triangleIndex); + } + + } + + }; + + FilteredCallback filterCallback(callback,aabbMin,aabbMax); + + m_meshInterface->InternalProcessAllTriangles(&filterCallback,aabbMin,aabbMax); +} + + + + + +void btTriangleMeshShape::calculateLocalInertia(btScalar mass,btVector3& inertia) const +{ + (void)mass; + //moving concave objects not supported + btAssert(0); + inertia.setValue(btScalar(0.),btScalar(0.),btScalar(0.)); +} + + +btVector3 btTriangleMeshShape::localGetSupportingVertex(const btVector3& vec) const +{ + btVector3 supportVertex; + + btTransform ident; + ident.setIdentity(); + + SupportVertexCallback supportCallback(vec,ident); + + btVector3 aabbMax(btScalar(BT_LARGE_FLOAT),btScalar(BT_LARGE_FLOAT),btScalar(BT_LARGE_FLOAT)); + + processAllTriangles(&supportCallback,-aabbMax,aabbMax); + + supportVertex = supportCallback.GetSupportVertexLocal(); + + return supportVertex; +} + + |