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Diffstat (limited to 'extern/bullet2/BulletCollision/CollisionDispatch/btManifoldResult.cpp')
| -rw-r--r-- | extern/bullet2/BulletCollision/CollisionDispatch/btManifoldResult.cpp | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/extern/bullet2/BulletCollision/CollisionDispatch/btManifoldResult.cpp b/extern/bullet2/BulletCollision/CollisionDispatch/btManifoldResult.cpp new file mode 100644 index 00000000000..e607bdbee58 --- /dev/null +++ b/extern/bullet2/BulletCollision/CollisionDispatch/btManifoldResult.cpp @@ -0,0 +1,134 @@ +/* +Bullet Continuous Collision Detection and Physics Library +Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/ + +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 "btManifoldResult.h" +#include "BulletCollision/NarrowPhaseCollision/btPersistentManifold.h" +#include "BulletCollision/CollisionDispatch/btCollisionObject.h" + + +///This is to allow MaterialCombiner/Custom Friction/Restitution values +ContactAddedCallback gContactAddedCallback=0; + +///User can override this material combiner by implementing gContactAddedCallback and setting body0->m_collisionFlags |= btCollisionObject::customMaterialCallback; +inline btScalar calculateCombinedFriction(const btCollisionObject* body0,const btCollisionObject* body1) +{ + btScalar friction = body0->getFriction() * body1->getFriction(); + + const btScalar MAX_FRICTION = btScalar(10.); + if (friction < -MAX_FRICTION) + friction = -MAX_FRICTION; + if (friction > MAX_FRICTION) + friction = MAX_FRICTION; + return friction; + +} + +inline btScalar calculateCombinedRestitution(const btCollisionObject* body0,const btCollisionObject* body1) +{ + return body0->getRestitution() * body1->getRestitution(); +} + + + +btManifoldResult::btManifoldResult(btCollisionObject* body0,btCollisionObject* body1) + :m_manifoldPtr(0), + m_body0(body0), + m_body1(body1) +#ifdef DEBUG_PART_INDEX + ,m_partId0(-1), + m_partId1(-1), + m_index0(-1), + m_index1(-1) +#endif //DEBUG_PART_INDEX +{ + m_rootTransA = body0->getWorldTransform(); + m_rootTransB = body1->getWorldTransform(); +} + + +void btManifoldResult::addContactPoint(const btVector3& normalOnBInWorld,const btVector3& pointInWorld,btScalar depth) +{ + btAssert(m_manifoldPtr); + //order in manifold needs to match + + if (depth > m_manifoldPtr->getContactBreakingThreshold()) + return; + + bool isSwapped = m_manifoldPtr->getBody0() != m_body0; + + btVector3 pointA = pointInWorld + normalOnBInWorld * depth; + + btVector3 localA; + btVector3 localB; + + if (isSwapped) + { + localA = m_rootTransB.invXform(pointA ); + localB = m_rootTransA.invXform(pointInWorld); + } else + { + localA = m_rootTransA.invXform(pointA ); + localB = m_rootTransB.invXform(pointInWorld); + } + + btManifoldPoint newPt(localA,localB,normalOnBInWorld,depth); + newPt.m_positionWorldOnA = pointA; + newPt.m_positionWorldOnB = pointInWorld; + + int insertIndex = m_manifoldPtr->getCacheEntry(newPt); + + newPt.m_combinedFriction = calculateCombinedFriction(m_body0,m_body1); + newPt.m_combinedRestitution = calculateCombinedRestitution(m_body0,m_body1); + + //BP mod, store contact triangles. + if (isSwapped) + { + newPt.m_partId0 = m_partId1; + newPt.m_partId1 = m_partId0; + newPt.m_index0 = m_index1; + newPt.m_index1 = m_index0; + } else + { + newPt.m_partId0 = m_partId0; + newPt.m_partId1 = m_partId1; + newPt.m_index0 = m_index0; + newPt.m_index1 = m_index1; + } + //printf("depth=%f\n",depth); + ///@todo, check this for any side effects + if (insertIndex >= 0) + { + //const btManifoldPoint& oldPoint = m_manifoldPtr->getContactPoint(insertIndex); + m_manifoldPtr->replaceContactPoint(newPt,insertIndex); + } else + { + insertIndex = m_manifoldPtr->addManifoldPoint(newPt); + } + + //User can override friction and/or restitution + if (gContactAddedCallback && + //and if either of the two bodies requires custom material + ((m_body0->getCollisionFlags() & btCollisionObject::CF_CUSTOM_MATERIAL_CALLBACK) || + (m_body1->getCollisionFlags() & btCollisionObject::CF_CUSTOM_MATERIAL_CALLBACK))) + { + //experimental feature info, for per-triangle material etc. + btCollisionObject* obj0 = isSwapped? m_body1 : m_body0; + btCollisionObject* obj1 = isSwapped? m_body0 : m_body1; + (*gContactAddedCallback)(m_manifoldPtr->getContactPoint(insertIndex),obj0,newPt.m_partId0,newPt.m_index0,obj1,newPt.m_partId1,newPt.m_index1); + } + +} + |