212 lines
8.5 KiB
C++
212 lines
8.5 KiB
C++
/*
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Bullet Continuous Collision Detection and Physics Library
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Copyright (c) 2003-2006 Erwin Coumans https://bulletphysics.org
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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 "btConvex2dConvex2dAlgorithm.h"
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//#include <stdio.h>
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#include "BulletCollision/NarrowPhaseCollision/btDiscreteCollisionDetectorInterface.h"
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#include "BulletCollision/BroadphaseCollision/btBroadphaseInterface.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/btCapsuleShape.h"
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#include "BulletCollision/NarrowPhaseCollision/btGjkPairDetector.h"
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#include "BulletCollision/BroadphaseCollision/btBroadphaseProxy.h"
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#include "BulletCollision/CollisionDispatch/btCollisionDispatcher.h"
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#include "BulletCollision/CollisionShapes/btBoxShape.h"
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#include "BulletCollision/CollisionDispatch/btManifoldResult.h"
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#include "BulletCollision/NarrowPhaseCollision/btConvexPenetrationDepthSolver.h"
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#include "BulletCollision/NarrowPhaseCollision/btContinuousConvexCollision.h"
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#include "BulletCollision/NarrowPhaseCollision/btSubSimplexConvexCast.h"
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#include "BulletCollision/NarrowPhaseCollision/btGjkConvexCast.h"
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#include "BulletCollision/NarrowPhaseCollision/btVoronoiSimplexSolver.h"
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#include "BulletCollision/CollisionShapes/btSphereShape.h"
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#include "BulletCollision/NarrowPhaseCollision/btMinkowskiPenetrationDepthSolver.h"
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#include "BulletCollision/NarrowPhaseCollision/btGjkEpa2.h"
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#include "BulletCollision/NarrowPhaseCollision/btGjkEpaPenetrationDepthSolver.h"
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#include "BulletCollision/CollisionDispatch/btCollisionObjectWrapper.h"
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btConvex2dConvex2dAlgorithm::CreateFunc::CreateFunc(btSimplexSolverInterface* simplexSolver, btConvexPenetrationDepthSolver* pdSolver)
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{
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m_simplexSolver = simplexSolver;
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m_pdSolver = pdSolver;
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}
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btConvex2dConvex2dAlgorithm::CreateFunc::~CreateFunc()
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{
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}
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btConvex2dConvex2dAlgorithm::btConvex2dConvex2dAlgorithm(btPersistentManifold* mf, const btCollisionAlgorithmConstructionInfo& ci, const btCollisionObjectWrapper* body0Wrap, const btCollisionObjectWrapper* body1Wrap, btSimplexSolverInterface* simplexSolver, btConvexPenetrationDepthSolver* pdSolver, int /* numPerturbationIterations */, int /* minimumPointsPerturbationThreshold */)
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: btActivatingCollisionAlgorithm(ci, body0Wrap, body1Wrap),
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m_simplexSolver(simplexSolver),
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m_pdSolver(pdSolver),
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m_ownManifold(false),
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m_manifoldPtr(mf),
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m_lowLevelOfDetail(false)
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{
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(void)body0Wrap;
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(void)body1Wrap;
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}
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btConvex2dConvex2dAlgorithm::~btConvex2dConvex2dAlgorithm()
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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 btConvex2dConvex2dAlgorithm ::setLowLevelOfDetail(bool useLowLevel)
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{
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m_lowLevelOfDetail = useLowLevel;
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}
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extern btScalar gContactBreakingThreshold;
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//
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// Convex-Convex collision algorithm
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//
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void btConvex2dConvex2dAlgorithm ::processCollision(const btCollisionObjectWrapper* body0Wrap, const btCollisionObjectWrapper* body1Wrap, const btDispatcherInfo& dispatchInfo, btManifoldResult* resultOut)
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{
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if (!m_manifoldPtr)
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{
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//swapped?
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m_manifoldPtr = m_dispatcher->getNewManifold(body0Wrap->getCollisionObject(), body1Wrap->getCollisionObject());
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m_ownManifold = true;
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}
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resultOut->setPersistentManifold(m_manifoldPtr);
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//comment-out next line to test multi-contact generation
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//resultOut->getPersistentManifold()->clearManifold();
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const btConvexShape* min0 = static_cast<const btConvexShape*>(body0Wrap->getCollisionShape());
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const btConvexShape* min1 = static_cast<const btConvexShape*>(body1Wrap->getCollisionShape());
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btVector3 normalOnB;
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btVector3 pointOnBWorld;
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{
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btGjkPairDetector::ClosestPointInput input;
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btGjkPairDetector gjkPairDetector(min0, min1, m_simplexSolver, m_pdSolver);
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//TODO: if (dispatchInfo.m_useContinuous)
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gjkPairDetector.setMinkowskiA(min0);
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gjkPairDetector.setMinkowskiB(min1);
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{
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input.m_maximumDistanceSquared = min0->getMargin() + min1->getMargin() + m_manifoldPtr->getContactBreakingThreshold();
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input.m_maximumDistanceSquared *= input.m_maximumDistanceSquared;
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}
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input.m_transformA = body0Wrap->getWorldTransform();
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input.m_transformB = body1Wrap->getWorldTransform();
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gjkPairDetector.getClosestPoints(input, *resultOut, dispatchInfo.m_debugDraw);
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btVector3 v0, v1;
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btVector3 sepNormalWorldSpace;
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}
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if (m_ownManifold)
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{
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resultOut->refreshContactPoints();
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}
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}
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btScalar btConvex2dConvex2dAlgorithm::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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///Rather then checking ALL pairs, only calculate TOI when motion exceeds threshold
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///Linear motion for one of objects needs to exceed m_ccdSquareMotionThreshold
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///col0->m_worldTransform,
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btScalar resultFraction = btScalar(1.);
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btScalar squareMot0 = (col0->getInterpolationWorldTransform().getOrigin() - col0->getWorldTransform().getOrigin()).length2();
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btScalar squareMot1 = (col1->getInterpolationWorldTransform().getOrigin() - col1->getWorldTransform().getOrigin()).length2();
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if (squareMot0 < col0->getCcdSquareMotionThreshold() &&
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squareMot1 < col1->getCcdSquareMotionThreshold())
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return resultFraction;
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//An adhoc way of testing the Continuous Collision Detection algorithms
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//One object is approximated as a sphere, to simplify things
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//Starting in penetration should report no time of impact
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//For proper CCD, better accuracy and handling of 'allowed' penetration should be added
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//also the mainloop of the physics should have a kind of toi queue (something like Brian Mirtich's application of Timewarp for Rigidbodies)
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/// Convex0 against sphere for Convex1
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{
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btConvexShape* convex0 = static_cast<btConvexShape*>(col0->getCollisionShape());
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btSphereShape sphere1(col1->getCcdSweptSphereRadius()); //todo: allow non-zero sphere sizes, for better approximation
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btConvexCast::CastResult result;
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btVoronoiSimplexSolver voronoiSimplex;
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//SubsimplexConvexCast ccd0(&sphere,min0,&voronoiSimplex);
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///Simplification, one object is simplified as a sphere
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btGjkConvexCast ccd1(convex0, &sphere1, &voronoiSimplex);
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//ContinuousConvexCollision ccd(min0,min1,&voronoiSimplex,0);
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if (ccd1.calcTimeOfImpact(col0->getWorldTransform(), col0->getInterpolationWorldTransform(),
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col1->getWorldTransform(), col1->getInterpolationWorldTransform(), result))
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{
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//store result.m_fraction in both bodies
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if (col0->getHitFraction() > result.m_fraction)
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col0->setHitFraction(result.m_fraction);
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if (col1->getHitFraction() > result.m_fraction)
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col1->setHitFraction(result.m_fraction);
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if (resultFraction > result.m_fraction)
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resultFraction = result.m_fraction;
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}
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}
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/// Sphere (for convex0) against Convex1
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{
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btConvexShape* convex1 = static_cast<btConvexShape*>(col1->getCollisionShape());
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btSphereShape sphere0(col0->getCcdSweptSphereRadius()); //todo: allow non-zero sphere sizes, for better approximation
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btConvexCast::CastResult result;
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btVoronoiSimplexSolver voronoiSimplex;
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//SubsimplexConvexCast ccd0(&sphere,min0,&voronoiSimplex);
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///Simplification, one object is simplified as a sphere
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btGjkConvexCast ccd1(&sphere0, convex1, &voronoiSimplex);
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//ContinuousConvexCollision ccd(min0,min1,&voronoiSimplex,0);
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if (ccd1.calcTimeOfImpact(col0->getWorldTransform(), col0->getInterpolationWorldTransform(),
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col1->getWorldTransform(), col1->getInterpolationWorldTransform(), result))
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{
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//store result.m_fraction in both bodies
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if (col0->getHitFraction() > result.m_fraction)
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col0->setHitFraction(result.m_fraction);
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if (col1->getHitFraction() > result.m_fraction)
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col1->setHitFraction(result.m_fraction);
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if (resultFraction > result.m_fraction)
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resultFraction = result.m_fraction;
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}
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}
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return resultFraction;
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}
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