diff options
Diffstat (limited to 'extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkConvexCast.cpp')
| -rw-r--r-- | extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkConvexCast.cpp | 160 |
1 files changed, 81 insertions, 79 deletions
diff --git a/extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkConvexCast.cpp b/extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkConvexCast.cpp index 93edffeafd6..bef697a0a11 100644 --- a/extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkConvexCast.cpp +++ b/extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkConvexCast.cpp @@ -17,12 +17,17 @@ subject to the following restrictions: #include "btGjkConvexCast.h" #include "BulletCollision/CollisionShapes/btSphereShape.h" -#include "BulletCollision/CollisionShapes/btMinkowskiSumShape.h" #include "btGjkPairDetector.h" #include "btPointCollector.h" +#include "LinearMath/btTransformUtil.h" +#ifdef BT_USE_DOUBLE_PRECISION +#define MAX_ITERATIONS 64 +#else +#define MAX_ITERATIONS 32 +#endif -btGjkConvexCast::btGjkConvexCast(btConvexShape* convexA,btConvexShape* convexB,btSimplexSolverInterface* simplexSolver) +btGjkConvexCast::btGjkConvexCast(const btConvexShape* convexA,const btConvexShape* convexB,btSimplexSolverInterface* simplexSolver) :m_simplexSolver(simplexSolver), m_convexA(convexA), m_convexB(convexB) @@ -38,120 +43,113 @@ bool btGjkConvexCast::calcTimeOfImpact( { - btMinkowskiSumShape combi(m_convexA,m_convexB); - btMinkowskiSumShape* convex = &combi; - - btTransform rayFromLocalA; - btTransform rayToLocalA; - - rayFromLocalA = fromA.inverse()* fromB; - rayToLocalA = toA.inverse()* toB; - - - btTransform trA,trB; - trA = btTransform(fromA); - trB = btTransform(fromB); - trA.setOrigin(btPoint3(0,0,0)); - trB.setOrigin(btPoint3(0,0,0)); - - convex->setTransformA(trA); - convex->setTransformB(trB); - + m_simplexSolver->reset(); + /// compute linear velocity for this interval, to interpolate + //assume no rotation/angular velocity, assert here? + btVector3 linVelA,linVelB; + linVelA = toA.getOrigin()-fromA.getOrigin(); + linVelB = toB.getOrigin()-fromB.getOrigin(); + btScalar radius = btScalar(0.001); + btScalar lambda = btScalar(0.); + btVector3 v(1,0,0); - btScalar radius = btScalar(0.01); + int maxIter = MAX_ITERATIONS; - btScalar lambda = btScalar(0.); - btVector3 s = rayFromLocalA.getOrigin(); - btVector3 r = rayToLocalA.getOrigin()-rayFromLocalA.getOrigin(); - btVector3 x = s; btVector3 n; - n.setValue(0,0,0); + n.setValue(btScalar(0.),btScalar(0.),btScalar(0.)); bool hasResult = false; btVector3 c; + btVector3 r = (linVelA-linVelB); btScalar lastLambda = lambda; + //btScalar epsilon = btScalar(0.001); + int numIter = 0; //first solution, using GJK - //no penetration support for now, perhaps pass a pointer when we really want it - btConvexPenetrationDepthSolver* penSolverPtr = 0; btTransform identityTrans; identityTrans.setIdentity(); - btSphereShape raySphere(btScalar(0.0)); - raySphere.setMargin(btScalar(0.)); - btTransform sphereTr; - sphereTr.setIdentity(); - sphereTr.setOrigin( rayFromLocalA.getOrigin()); +// result.drawCoordSystem(sphereTr); - result.drawCoordSystem(sphereTr); - { - btPointCollector pointCollector1; - btGjkPairDetector gjk(&raySphere,convex,m_simplexSolver,penSolverPtr); + btPointCollector pointCollector; - btGjkPairDetector::ClosestPointInput input; - input.m_transformA = sphereTr; - input.m_transformB = identityTrans; - gjk.getClosestPoints(input,pointCollector1,0); + + btGjkPairDetector gjk(m_convexA,m_convexB,m_simplexSolver,0);//m_penetrationDepthSolver); + btGjkPairDetector::ClosestPointInput input; - hasResult = pointCollector1.m_hasResult; - c = pointCollector1.m_pointInWorld; - n = pointCollector1.m_normalOnBInWorld; - } + //we don't use margins during CCD + // gjk.setIgnoreMargin(true); - + input.m_transformA = fromA; + input.m_transformB = fromB; + gjk.getClosestPoints(input,pointCollector,0); + + hasResult = pointCollector.m_hasResult; + c = pointCollector.m_pointInWorld; if (hasResult) { btScalar dist; - dist = (c-x).length(); - if (dist < radius) - { - //penetration - lastLambda = btScalar(1.); - } + dist = pointCollector.m_distance; + n = pointCollector.m_normalOnBInWorld; + + //not close enough while (dist > radius) { + numIter++; + if (numIter > maxIter) + { + return false; //todo: report a failure + } + btScalar dLambda = btScalar(0.); + + btScalar projectedLinearVelocity = r.dot(n); - n = x - c; - btScalar nDotr = n.dot(r); + dLambda = dist / (projectedLinearVelocity); + + lambda = lambda - dLambda; - if (nDotr >= -(SIMD_EPSILON*SIMD_EPSILON)) + if (lambda > btScalar(1.)) return false; - - lambda = lambda - n.dot(n) / nDotr; + + 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; - x = s + lambda * r; - - sphereTr.setOrigin( x ); - result.drawCoordSystem(sphereTr); - btPointCollector pointCollector; - btGjkPairDetector gjk(&raySphere,convex,m_simplexSolver,penSolverPtr); - btGjkPairDetector::ClosestPointInput input; - input.m_transformA = sphereTr; - input.m_transformB = identityTrans; + //interpolate to next lambda + result.DebugDraw( lambda ); + input.m_transformA.getOrigin().setInterpolate3(fromA.getOrigin(),toA.getOrigin(),lambda); + input.m_transformB.getOrigin().setInterpolate3(fromB.getOrigin(),toB.getOrigin(),lambda); + gjk.getClosestPoints(input,pointCollector,0); if (pointCollector.m_hasResult) { if (pointCollector.m_distance < btScalar(0.)) { - //degeneracy, report a hit result.m_fraction = lastLambda; - result.m_normal = n; + n = pointCollector.m_normalOnBInWorld; + result.m_normal=n; + result.m_hitPoint = pointCollector.m_pointInWorld; return true; } - c = pointCollector.m_pointInWorld; - dist = (c-x).length(); + c = pointCollector.m_pointInWorld; + n = pointCollector.m_normalOnBInWorld; + dist = pointCollector.m_distance; } else { //?? @@ -160,15 +158,19 @@ bool btGjkConvexCast::calcTimeOfImpact( } - if (lastLambda < btScalar(1.)) - { - - result.m_fraction = lastLambda; - result.m_normal = n; - return true; - } + //is n normalized? + //don't report time of impact for motion away from the contact normal (or causes minor penetration) + if (n.dot(r)>=-result.m_allowedPenetration) + return false; + + result.m_fraction = lambda; + result.m_normal = n; + result.m_hitPoint = c; + return true; } return false; + + } |