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Diffstat (limited to 'extern/bullet2/BulletCollision/NarrowPhaseCollision/btPersistentManifold.cpp')
-rw-r--r-- | extern/bullet2/BulletCollision/NarrowPhaseCollision/btPersistentManifold.cpp | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/extern/bullet2/BulletCollision/NarrowPhaseCollision/btPersistentManifold.cpp b/extern/bullet2/BulletCollision/NarrowPhaseCollision/btPersistentManifold.cpp new file mode 100644 index 00000000000..924a8af87d1 --- /dev/null +++ b/extern/bullet2/BulletCollision/NarrowPhaseCollision/btPersistentManifold.cpp @@ -0,0 +1,260 @@ +/* +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 "btPersistentManifold.h" +#include "LinearMath/btTransform.h" + + +btScalar gContactBreakingThreshold = btScalar(0.02); +ContactDestroyedCallback gContactDestroyedCallback = 0; +ContactProcessedCallback gContactProcessedCallback = 0; + + + +btPersistentManifold::btPersistentManifold() +:btTypedObject(BT_PERSISTENT_MANIFOLD_TYPE), +m_body0(0), +m_body1(0), +m_cachedPoints (0), +m_index1a(0) +{ +} + + + + +#ifdef DEBUG_PERSISTENCY +#include <stdio.h> +void btPersistentManifold::DebugPersistency() +{ + int i; + printf("DebugPersistency : numPoints %d\n",m_cachedPoints); + for (i=0;i<m_cachedPoints;i++) + { + printf("m_pointCache[%d].m_userPersistentData = %x\n",i,m_pointCache[i].m_userPersistentData); + } +} +#endif //DEBUG_PERSISTENCY + +void btPersistentManifold::clearUserCache(btManifoldPoint& pt) +{ + + void* oldPtr = pt.m_userPersistentData; + if (oldPtr) + { +#ifdef DEBUG_PERSISTENCY + int i; + int occurance = 0; + for (i=0;i<m_cachedPoints;i++) + { + if (m_pointCache[i].m_userPersistentData == oldPtr) + { + occurance++; + if (occurance>1) + printf("error in clearUserCache\n"); + } + } + btAssert(occurance<=0); +#endif //DEBUG_PERSISTENCY + + if (pt.m_userPersistentData && gContactDestroyedCallback) + { + (*gContactDestroyedCallback)(pt.m_userPersistentData); + pt.m_userPersistentData = 0; + } + +#ifdef DEBUG_PERSISTENCY + DebugPersistency(); +#endif + } + + +} + + +int btPersistentManifold::sortCachedPoints(const btManifoldPoint& pt) +{ + + //calculate 4 possible cases areas, and take biggest area + //also need to keep 'deepest' + + int maxPenetrationIndex = -1; +#define KEEP_DEEPEST_POINT 1 +#ifdef KEEP_DEEPEST_POINT + btScalar maxPenetration = pt.getDistance(); + for (int i=0;i<4;i++) + { + if (m_pointCache[i].getDistance() < maxPenetration) + { + maxPenetrationIndex = i; + maxPenetration = m_pointCache[i].getDistance(); + } + } +#endif //KEEP_DEEPEST_POINT + + btScalar res0(btScalar(0.)),res1(btScalar(0.)),res2(btScalar(0.)),res3(btScalar(0.)); + if (maxPenetrationIndex != 0) + { + btVector3 a0 = pt.m_localPointA-m_pointCache[1].m_localPointA; + btVector3 b0 = m_pointCache[3].m_localPointA-m_pointCache[2].m_localPointA; + btVector3 cross = a0.cross(b0); + res0 = cross.length2(); + } + if (maxPenetrationIndex != 1) + { + btVector3 a1 = pt.m_localPointA-m_pointCache[0].m_localPointA; + btVector3 b1 = m_pointCache[3].m_localPointA-m_pointCache[2].m_localPointA; + btVector3 cross = a1.cross(b1); + res1 = cross.length2(); + } + + if (maxPenetrationIndex != 2) + { + btVector3 a2 = pt.m_localPointA-m_pointCache[0].m_localPointA; + btVector3 b2 = m_pointCache[3].m_localPointA-m_pointCache[1].m_localPointA; + btVector3 cross = a2.cross(b2); + res2 = cross.length2(); + } + + if (maxPenetrationIndex != 3) + { + btVector3 a3 = pt.m_localPointA-m_pointCache[0].m_localPointA; + btVector3 b3 = m_pointCache[2].m_localPointA-m_pointCache[1].m_localPointA; + btVector3 cross = a3.cross(b3); + res3 = cross.length2(); + } + + btVector4 maxvec(res0,res1,res2,res3); + int biggestarea = maxvec.closestAxis4(); + return biggestarea; +} + + +int btPersistentManifold::getCacheEntry(const btManifoldPoint& newPoint) const +{ + btScalar shortestDist = getContactBreakingThreshold() * getContactBreakingThreshold(); + int size = getNumContacts(); + int nearestPoint = -1; + for( int i = 0; i < size; i++ ) + { + const btManifoldPoint &mp = m_pointCache[i]; + + btVector3 diffA = mp.m_localPointA- newPoint.m_localPointA; + const btScalar distToManiPoint = diffA.dot(diffA); + if( distToManiPoint < shortestDist ) + { + shortestDist = distToManiPoint; + nearestPoint = i; + } + } + return nearestPoint; +} + +int btPersistentManifold::addManifoldPoint(const btManifoldPoint& newPoint) +{ + btAssert(validContactDistance(newPoint)); + + int insertIndex = getNumContacts(); + if (insertIndex == MANIFOLD_CACHE_SIZE) + { +#if MANIFOLD_CACHE_SIZE >= 4 + //sort cache so best points come first, based on area + insertIndex = sortCachedPoints(newPoint); +#else + insertIndex = 0; +#endif + clearUserCache(m_pointCache[insertIndex]); + + } else + { + m_cachedPoints++; + + + } + if (insertIndex<0) + insertIndex=0; + + btAssert(m_pointCache[insertIndex].m_userPersistentData==0); + m_pointCache[insertIndex] = newPoint; + return insertIndex; +} + +btScalar btPersistentManifold::getContactBreakingThreshold() const +{ + return m_contactBreakingThreshold; +} + + + +void btPersistentManifold::refreshContactPoints(const btTransform& trA,const btTransform& trB) +{ + int i; +#ifdef DEBUG_PERSISTENCY + printf("refreshContactPoints posA = (%f,%f,%f) posB = (%f,%f,%f)\n", + trA.getOrigin().getX(), + trA.getOrigin().getY(), + trA.getOrigin().getZ(), + trB.getOrigin().getX(), + trB.getOrigin().getY(), + trB.getOrigin().getZ()); +#endif //DEBUG_PERSISTENCY + /// first refresh worldspace positions and distance + for (i=getNumContacts()-1;i>=0;i--) + { + btManifoldPoint &manifoldPoint = m_pointCache[i]; + manifoldPoint.m_positionWorldOnA = trA( manifoldPoint.m_localPointA ); + manifoldPoint.m_positionWorldOnB = trB( manifoldPoint.m_localPointB ); + manifoldPoint.m_distance1 = (manifoldPoint.m_positionWorldOnA - manifoldPoint.m_positionWorldOnB).dot(manifoldPoint.m_normalWorldOnB); + manifoldPoint.m_lifeTime++; + } + + /// then + btScalar distance2d; + btVector3 projectedDifference,projectedPoint; + for (i=getNumContacts()-1;i>=0;i--) + { + + btManifoldPoint &manifoldPoint = m_pointCache[i]; + //contact becomes invalid when signed distance exceeds margin (projected on contactnormal direction) + if (!validContactDistance(manifoldPoint)) + { + removeContactPoint(i); + } else + { + //contact also becomes invalid when relative movement orthogonal to normal exceeds margin + projectedPoint = manifoldPoint.m_positionWorldOnA - manifoldPoint.m_normalWorldOnB * manifoldPoint.m_distance1; + projectedDifference = manifoldPoint.m_positionWorldOnB - projectedPoint; + distance2d = projectedDifference.dot(projectedDifference); + if (distance2d > getContactBreakingThreshold()*getContactBreakingThreshold() ) + { + removeContactPoint(i); + } else + { + //contact point processed callback + if (gContactProcessedCallback) + (*gContactProcessedCallback)(manifoldPoint,m_body0,m_body1); + } + } + } +#ifdef DEBUG_PERSISTENCY + DebugPersistency(); +#endif // +} + + + + + |