diff options
Diffstat (limited to 'extern/bullet2/LinearMath/btTransformUtil.h')
| -rw-r--r-- | extern/bullet2/LinearMath/btTransformUtil.h | 228 |
1 files changed, 0 insertions, 228 deletions
diff --git a/extern/bullet2/LinearMath/btTransformUtil.h b/extern/bullet2/LinearMath/btTransformUtil.h deleted file mode 100644 index dd9057546d8..00000000000 --- a/extern/bullet2/LinearMath/btTransformUtil.h +++ /dev/null @@ -1,228 +0,0 @@ -/* -Copyright (c) 2003-2006 Gino van den Bergen / 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. -*/ - - -#ifndef SIMD_TRANSFORM_UTIL_H -#define SIMD_TRANSFORM_UTIL_H - -#include "btTransform.h" -#define ANGULAR_MOTION_THRESHOLD btScalar(0.5)*SIMD_HALF_PI - - - - -SIMD_FORCE_INLINE btVector3 btAabbSupport(const btVector3& halfExtents,const btVector3& supportDir) -{ - return btVector3(supportDir.x() < btScalar(0.0) ? -halfExtents.x() : halfExtents.x(), - supportDir.y() < btScalar(0.0) ? -halfExtents.y() : halfExtents.y(), - supportDir.z() < btScalar(0.0) ? -halfExtents.z() : halfExtents.z()); -} - - - - - - -/// Utils related to temporal transforms -class btTransformUtil -{ - -public: - - static void integrateTransform(const btTransform& curTrans,const btVector3& linvel,const btVector3& angvel,btScalar timeStep,btTransform& predictedTransform) - { - predictedTransform.setOrigin(curTrans.getOrigin() + linvel * timeStep); -// #define QUATERNION_DERIVATIVE - #ifdef QUATERNION_DERIVATIVE - btQuaternion predictedOrn = curTrans.getRotation(); - predictedOrn += (angvel * predictedOrn) * (timeStep * btScalar(0.5)); - predictedOrn.normalize(); - #else - //Exponential map - //google for "Practical Parameterization of Rotations Using the Exponential Map", F. Sebastian Grassia - - btVector3 axis; - btScalar fAngle = angvel.length(); - //limit the angular motion - if (fAngle*timeStep > ANGULAR_MOTION_THRESHOLD) - { - fAngle = ANGULAR_MOTION_THRESHOLD / timeStep; - } - - if ( fAngle < btScalar(0.001) ) - { - // use Taylor's expansions of sync function - axis = angvel*( btScalar(0.5)*timeStep-(timeStep*timeStep*timeStep)*(btScalar(0.020833333333))*fAngle*fAngle ); - } - else - { - // sync(fAngle) = sin(c*fAngle)/t - axis = angvel*( btSin(btScalar(0.5)*fAngle*timeStep)/fAngle ); - } - btQuaternion dorn (axis.x(),axis.y(),axis.z(),btCos( fAngle*timeStep*btScalar(0.5) )); - btQuaternion orn0 = curTrans.getRotation(); - - btQuaternion predictedOrn = dorn * orn0; - predictedOrn.normalize(); - #endif - predictedTransform.setRotation(predictedOrn); - } - - static void calculateVelocityQuaternion(const btVector3& pos0,const btVector3& pos1,const btQuaternion& orn0,const btQuaternion& orn1,btScalar timeStep,btVector3& linVel,btVector3& angVel) - { - linVel = (pos1 - pos0) / timeStep; - btVector3 axis; - btScalar angle; - if (orn0 != orn1) - { - calculateDiffAxisAngleQuaternion(orn0,orn1,axis,angle); - angVel = axis * angle / timeStep; - } else - { - angVel.setValue(0,0,0); - } - } - - static void calculateDiffAxisAngleQuaternion(const btQuaternion& orn0,const btQuaternion& orn1a,btVector3& axis,btScalar& angle) - { - btQuaternion orn1 = orn0.nearest(orn1a); - btQuaternion dorn = orn1 * orn0.inverse(); - angle = dorn.getAngle(); - axis = btVector3(dorn.x(),dorn.y(),dorn.z()); - axis[3] = btScalar(0.); - //check for axis length - btScalar len = axis.length2(); - if (len < SIMD_EPSILON*SIMD_EPSILON) - axis = btVector3(btScalar(1.),btScalar(0.),btScalar(0.)); - else - axis /= btSqrt(len); - } - - static void calculateVelocity(const btTransform& transform0,const btTransform& transform1,btScalar timeStep,btVector3& linVel,btVector3& angVel) - { - linVel = (transform1.getOrigin() - transform0.getOrigin()) / timeStep; - btVector3 axis; - btScalar angle; - calculateDiffAxisAngle(transform0,transform1,axis,angle); - angVel = axis * angle / timeStep; - } - - static void calculateDiffAxisAngle(const btTransform& transform0,const btTransform& transform1,btVector3& axis,btScalar& angle) - { - btMatrix3x3 dmat = transform1.getBasis() * transform0.getBasis().inverse(); - btQuaternion dorn; - dmat.getRotation(dorn); - - ///floating point inaccuracy can lead to w component > 1..., which breaks - dorn.normalize(); - - angle = dorn.getAngle(); - axis = btVector3(dorn.x(),dorn.y(),dorn.z()); - axis[3] = btScalar(0.); - //check for axis length - btScalar len = axis.length2(); - if (len < SIMD_EPSILON*SIMD_EPSILON) - axis = btVector3(btScalar(1.),btScalar(0.),btScalar(0.)); - else - axis /= btSqrt(len); - } - -}; - - -///The btConvexSeparatingDistanceUtil can help speed up convex collision detection -///by conservatively updating a cached separating distance/vector instead of re-calculating the closest distance -class btConvexSeparatingDistanceUtil -{ - btQuaternion m_ornA; - btQuaternion m_ornB; - btVector3 m_posA; - btVector3 m_posB; - - btVector3 m_separatingNormal; - - btScalar m_boundingRadiusA; - btScalar m_boundingRadiusB; - btScalar m_separatingDistance; - -public: - - btConvexSeparatingDistanceUtil(btScalar boundingRadiusA,btScalar boundingRadiusB) - :m_boundingRadiusA(boundingRadiusA), - m_boundingRadiusB(boundingRadiusB), - m_separatingDistance(0.f) - { - } - - btScalar getConservativeSeparatingDistance() - { - return m_separatingDistance; - } - - void updateSeparatingDistance(const btTransform& transA,const btTransform& transB) - { - const btVector3& toPosA = transA.getOrigin(); - const btVector3& toPosB = transB.getOrigin(); - btQuaternion toOrnA = transA.getRotation(); - btQuaternion toOrnB = transB.getRotation(); - - if (m_separatingDistance>0.f) - { - - - btVector3 linVelA,angVelA,linVelB,angVelB; - btTransformUtil::calculateVelocityQuaternion(m_posA,toPosA,m_ornA,toOrnA,btScalar(1.),linVelA,angVelA); - btTransformUtil::calculateVelocityQuaternion(m_posB,toPosB,m_ornB,toOrnB,btScalar(1.),linVelB,angVelB); - btScalar maxAngularProjectedVelocity = angVelA.length() * m_boundingRadiusA + angVelB.length() * m_boundingRadiusB; - btVector3 relLinVel = (linVelB-linVelA); - btScalar relLinVelocLength = (linVelB-linVelA).dot(m_separatingNormal); - if (relLinVelocLength<0.f) - { - relLinVelocLength = 0.f; - } - - btScalar projectedMotion = maxAngularProjectedVelocity +relLinVelocLength; - m_separatingDistance -= projectedMotion; - } - - m_posA = toPosA; - m_posB = toPosB; - m_ornA = toOrnA; - m_ornB = toOrnB; - } - - void initSeparatingDistance(const btVector3& separatingVector,btScalar separatingDistance,const btTransform& transA,const btTransform& transB) - { - m_separatingDistance = separatingDistance; - - if (m_separatingDistance>0.f) - { - m_separatingNormal = separatingVector; - - const btVector3& toPosA = transA.getOrigin(); - const btVector3& toPosB = transB.getOrigin(); - btQuaternion toOrnA = transA.getRotation(); - btQuaternion toOrnB = transB.getRotation(); - m_posA = toPosA; - m_posB = toPosB; - m_ornA = toOrnA; - m_ornB = toOrnB; - } - } - -}; - - -#endif //SIMD_TRANSFORM_UTIL_H - |