156 lines
6.2 KiB
C++
156 lines
6.2 KiB
C++
/*
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Bullet Continuous Collision Detection and Physics Library
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Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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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.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "btConvexPlaneCollisionAlgorithm.h"
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#include "BulletCollision/CollisionDispatch/btCollisionDispatcher.h"
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#include "BulletCollision/CollisionDispatch/btCollisionObject.h"
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#include "BulletCollision/CollisionShapes/btConvexShape.h"
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#include "BulletCollision/CollisionShapes/btStaticPlaneShape.h"
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//#include <stdio.h>
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btConvexPlaneCollisionAlgorithm::btConvexPlaneCollisionAlgorithm(btPersistentManifold* mf,const btCollisionAlgorithmConstructionInfo& ci,btCollisionObject* col0,btCollisionObject* col1, bool isSwapped, int numPerturbationIterations,int minimumPointsPerturbationThreshold)
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: btCollisionAlgorithm(ci),
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m_ownManifold(false),
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m_manifoldPtr(mf),
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m_isSwapped(isSwapped),
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m_numPerturbationIterations(numPerturbationIterations),
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m_minimumPointsPerturbationThreshold(minimumPointsPerturbationThreshold)
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{
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btCollisionObject* convexObj = m_isSwapped? col1 : col0;
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btCollisionObject* planeObj = m_isSwapped? col0 : col1;
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if (!m_manifoldPtr && m_dispatcher->needsCollision(convexObj,planeObj))
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{
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m_manifoldPtr = m_dispatcher->getNewManifold(convexObj,planeObj);
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m_ownManifold = true;
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}
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}
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btConvexPlaneCollisionAlgorithm::~btConvexPlaneCollisionAlgorithm()
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{
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if (m_ownManifold)
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{
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if (m_manifoldPtr)
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m_dispatcher->releaseManifold(m_manifoldPtr);
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}
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}
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void btConvexPlaneCollisionAlgorithm::collideSingleContact (const btQuaternion& perturbeRot, btCollisionObject* body0,btCollisionObject* body1,const btDispatcherInfo& dispatchInfo,btManifoldResult* resultOut)
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{
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btCollisionObject* convexObj = m_isSwapped? body1 : body0;
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btCollisionObject* planeObj = m_isSwapped? body0: body1;
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btConvexShape* convexShape = (btConvexShape*) convexObj->getCollisionShape();
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btStaticPlaneShape* planeShape = (btStaticPlaneShape*) planeObj->getCollisionShape();
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bool hasCollision = false;
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const btVector3& planeNormal = planeShape->getPlaneNormal();
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const btScalar& planeConstant = planeShape->getPlaneConstant();
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btTransform convexWorldTransform = convexObj->getWorldTransform();
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btTransform convexInPlaneTrans;
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convexInPlaneTrans= planeObj->getWorldTransform().inverse() * convexWorldTransform;
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//now perturbe the convex-world transform
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convexWorldTransform.getBasis()*=btMatrix3x3(perturbeRot);
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btTransform planeInConvex;
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planeInConvex= convexWorldTransform.inverse() * planeObj->getWorldTransform();
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btVector3 vtx = convexShape->localGetSupportingVertex(planeInConvex.getBasis()*-planeNormal);
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btVector3 vtxInPlane = convexInPlaneTrans(vtx);
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btScalar distance = (planeNormal.dot(vtxInPlane) - planeConstant);
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btVector3 vtxInPlaneProjected = vtxInPlane - distance*planeNormal;
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btVector3 vtxInPlaneWorld = planeObj->getWorldTransform() * vtxInPlaneProjected;
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hasCollision = distance < m_manifoldPtr->getContactBreakingThreshold();
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resultOut->setPersistentManifold(m_manifoldPtr);
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if (hasCollision)
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{
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/// report a contact. internally this will be kept persistent, and contact reduction is done
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btVector3 normalOnSurfaceB = planeObj->getWorldTransform().getBasis() * planeNormal;
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btVector3 pOnB = vtxInPlaneWorld;
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resultOut->addContactPoint(normalOnSurfaceB,pOnB,distance);
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}
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}
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void btConvexPlaneCollisionAlgorithm::processCollision (btCollisionObject* body0,btCollisionObject* body1,const btDispatcherInfo& dispatchInfo,btManifoldResult* resultOut)
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{
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(void)dispatchInfo;
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if (!m_manifoldPtr)
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return;
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btCollisionObject* convexObj = m_isSwapped? body1 : body0;
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btCollisionObject* planeObj = m_isSwapped? body0: body1;
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btConvexShape* convexShape = (btConvexShape*) convexObj->getCollisionShape();
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btStaticPlaneShape* planeShape = (btStaticPlaneShape*) planeObj->getCollisionShape();
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const btVector3& planeNormal = planeShape->getPlaneNormal();
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//const btScalar& planeConstant = planeShape->getPlaneConstant();
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//first perform a collision query with the non-perturbated collision objects
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{
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btQuaternion rotq(0,0,0,1);
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collideSingleContact(rotq,body0,body1,dispatchInfo,resultOut);
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}
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if (resultOut->getPersistentManifold()->getNumContacts()<m_minimumPointsPerturbationThreshold)
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{
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btVector3 v0,v1;
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btPlaneSpace1(planeNormal,v0,v1);
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//now perform 'm_numPerturbationIterations' collision queries with the perturbated collision objects
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const btScalar angleLimit = 0.125f * SIMD_PI;
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btScalar perturbeAngle;
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btScalar radius = convexShape->getAngularMotionDisc();
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perturbeAngle = gContactBreakingThreshold / radius;
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if ( perturbeAngle > angleLimit )
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perturbeAngle = angleLimit;
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btQuaternion perturbeRot(v0,perturbeAngle);
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for (int i=0;i<m_numPerturbationIterations;i++)
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{
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btScalar iterationAngle = i*(SIMD_2_PI/btScalar(m_numPerturbationIterations));
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btQuaternion rotq(planeNormal,iterationAngle);
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collideSingleContact(rotq.inverse()*perturbeRot*rotq,body0,body1,dispatchInfo,resultOut);
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}
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}
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if (m_ownManifold)
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{
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if (m_manifoldPtr->getNumContacts())
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{
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resultOut->refreshContactPoints();
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}
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}
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}
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btScalar btConvexPlaneCollisionAlgorithm::calculateTimeOfImpact(btCollisionObject* col0,btCollisionObject* col1,const btDispatcherInfo& dispatchInfo,btManifoldResult* resultOut)
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{
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(void)resultOut;
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(void)dispatchInfo;
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(void)col0;
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(void)col1;
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//not yet
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return btScalar(1.);
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}
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