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Diffstat (limited to 'extern/bullet2/BulletCollision/NarrowPhaseCollision/btContinuousConvexCollision.cpp')
| -rw-r--r-- | extern/bullet2/BulletCollision/NarrowPhaseCollision/btContinuousConvexCollision.cpp | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/extern/bullet2/BulletCollision/NarrowPhaseCollision/btContinuousConvexCollision.cpp b/extern/bullet2/BulletCollision/NarrowPhaseCollision/btContinuousConvexCollision.cpp new file mode 100644 index 00000000000..9ee83e7d561 --- /dev/null +++ b/extern/bullet2/BulletCollision/NarrowPhaseCollision/btContinuousConvexCollision.cpp @@ -0,0 +1,236 @@ +/* +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 "btContinuousConvexCollision.h" +#include "BulletCollision/CollisionShapes/btConvexShape.h" +#include "BulletCollision/NarrowPhaseCollision/btSimplexSolverInterface.h" +#include "LinearMath/btTransformUtil.h" +#include "BulletCollision/CollisionShapes/btSphereShape.h" + +#include "btGjkPairDetector.h" +#include "btPointCollector.h" + + + +btContinuousConvexCollision::btContinuousConvexCollision ( const btConvexShape* convexA,const btConvexShape* convexB,btSimplexSolverInterface* simplexSolver, btConvexPenetrationDepthSolver* penetrationDepthSolver) +:m_simplexSolver(simplexSolver), +m_penetrationDepthSolver(penetrationDepthSolver), +m_convexA(convexA),m_convexB(convexB) +{ +} + +/// This maximum should not be necessary. It allows for untested/degenerate cases in production code. +/// You don't want your game ever to lock-up. +#define MAX_ITERATIONS 64 + +bool btContinuousConvexCollision::calcTimeOfImpact( + const btTransform& fromA, + const btTransform& toA, + const btTransform& fromB, + const btTransform& toB, + CastResult& result) +{ + + m_simplexSolver->reset(); + + /// compute linear and angular velocity for this interval, to interpolate + btVector3 linVelA,angVelA,linVelB,angVelB; + btTransformUtil::calculateVelocity(fromA,toA,btScalar(1.),linVelA,angVelA); + btTransformUtil::calculateVelocity(fromB,toB,btScalar(1.),linVelB,angVelB); + + + btScalar boundingRadiusA = m_convexA->getAngularMotionDisc(); + btScalar boundingRadiusB = m_convexB->getAngularMotionDisc(); + + btScalar maxAngularProjectedVelocity = angVelA.length() * boundingRadiusA + angVelB.length() * boundingRadiusB; + btVector3 relLinVel = (linVelB-linVelA); + + btScalar relLinVelocLength = (linVelB-linVelA).length(); + + if ((relLinVelocLength+maxAngularProjectedVelocity) == 0.f) + return false; + + + btScalar radius = btScalar(0.001); + + btScalar lambda = btScalar(0.); + btVector3 v(1,0,0); + + int maxIter = MAX_ITERATIONS; + + btVector3 n; + n.setValue(btScalar(0.),btScalar(0.),btScalar(0.)); + bool hasResult = false; + btVector3 c; + + btScalar lastLambda = lambda; + //btScalar epsilon = btScalar(0.001); + + int numIter = 0; + //first solution, using GJK + + + btTransform identityTrans; + identityTrans.setIdentity(); + + btSphereShape raySphere(btScalar(0.0)); + raySphere.setMargin(btScalar(0.)); + + +// result.drawCoordSystem(sphereTr); + + btPointCollector pointCollector1; + + { + + btGjkPairDetector gjk(m_convexA,m_convexB,m_convexA->getShapeType(),m_convexB->getShapeType(),m_convexA->getMargin(),m_convexB->getMargin(),m_simplexSolver,m_penetrationDepthSolver); + btGjkPairDetector::ClosestPointInput input; + + //we don't use margins during CCD + // gjk.setIgnoreMargin(true); + + input.m_transformA = fromA; + input.m_transformB = fromB; + gjk.getClosestPoints(input,pointCollector1,0); + + hasResult = pointCollector1.m_hasResult; + c = pointCollector1.m_pointInWorld; + } + + if (hasResult) + { + btScalar dist; + dist = pointCollector1.m_distance; + n = pointCollector1.m_normalOnBInWorld; + + btScalar projectedLinearVelocity = relLinVel.dot(n); + + //not close enough + while (dist > radius) + { + if (result.m_debugDrawer) + { + result.m_debugDrawer->drawSphere(c,0.2f,btVector3(1,1,1)); + } + numIter++; + if (numIter > maxIter) + { + return false; //todo: report a failure + } + btScalar dLambda = btScalar(0.); + + projectedLinearVelocity = relLinVel.dot(n); + + //calculate safe moving fraction from distance / (linear+rotational velocity) + + //btScalar clippedDist = GEN_min(angularConservativeRadius,dist); + //btScalar clippedDist = dist; + + //don't report time of impact for motion away from the contact normal (or causes minor penetration) + if ((projectedLinearVelocity+ maxAngularProjectedVelocity)<=SIMD_EPSILON) + return false; + + dLambda = dist / (projectedLinearVelocity+ maxAngularProjectedVelocity); + + + + lambda = lambda + dLambda; + + if (lambda > btScalar(1.)) + return false; + + if (lambda < btScalar(0.)) + return false; + + + //todo: next check with relative epsilon + if (lambda <= lastLambda) + { + return false; + //n.setValue(0,0,0); + break; + } + lastLambda = lambda; + + + + //interpolate to next lambda + btTransform interpolatedTransA,interpolatedTransB,relativeTrans; + + btTransformUtil::integrateTransform(fromA,linVelA,angVelA,lambda,interpolatedTransA); + btTransformUtil::integrateTransform(fromB,linVelB,angVelB,lambda,interpolatedTransB); + relativeTrans = interpolatedTransB.inverseTimes(interpolatedTransA); + + if (result.m_debugDrawer) + { + result.m_debugDrawer->drawSphere(interpolatedTransA.getOrigin(),0.2f,btVector3(1,0,0)); + } + + result.DebugDraw( lambda ); + + btPointCollector pointCollector; + btGjkPairDetector gjk(m_convexA,m_convexB,m_simplexSolver,m_penetrationDepthSolver); + btGjkPairDetector::ClosestPointInput input; + input.m_transformA = interpolatedTransA; + input.m_transformB = interpolatedTransB; + gjk.getClosestPoints(input,pointCollector,0); + if (pointCollector.m_hasResult) + { + if (pointCollector.m_distance < btScalar(0.)) + { + //degenerate ?! + result.m_fraction = lastLambda; + n = pointCollector.m_normalOnBInWorld; + result.m_normal=n;//.setValue(1,1,1);// = n; + result.m_hitPoint = pointCollector.m_pointInWorld; + return true; + } + c = pointCollector.m_pointInWorld; + n = pointCollector.m_normalOnBInWorld; + dist = pointCollector.m_distance; + } else + { + //?? + return false; + } + + + } + + if ((projectedLinearVelocity+ maxAngularProjectedVelocity)<=result.m_allowedPenetration)//SIMD_EPSILON) + return false; + + result.m_fraction = lambda; + result.m_normal = n; + result.m_hitPoint = c; + return true; + } + + return false; + +/* +//todo: + //if movement away from normal, discard result + btVector3 move = transBLocalTo.getOrigin() - transBLocalFrom.getOrigin(); + if (result.m_fraction < btScalar(1.)) + { + if (move.dot(result.m_normal) <= btScalar(0.)) + { + } + } +*/ + +} |