2004 lines
83 KiB
C++
2004 lines
83 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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//#define COMPUTE_IMPULSE_DENOM 1
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//#define BT_ADDITIONAL_DEBUG
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//It is not necessary (redundant) to refresh contact manifolds, this refresh has been moved to the collision algorithms.
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#include "btSequentialImpulseConstraintSolver.h"
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#include "BulletCollision/NarrowPhaseCollision/btPersistentManifold.h"
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#include "LinearMath/btIDebugDraw.h"
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#include "LinearMath/btCpuFeatureUtility.h"
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//#include "btJacobianEntry.h"
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#include "LinearMath/btMinMax.h"
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#include "BulletDynamics/ConstraintSolver/btTypedConstraint.h"
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#include <new>
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#include "LinearMath/btStackAlloc.h"
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#include "LinearMath/btQuickprof.h"
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//#include "btSolverBody.h"
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//#include "btSolverConstraint.h"
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#include "LinearMath/btAlignedObjectArray.h"
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#include <string.h> //for memset
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int gNumSplitImpulseRecoveries = 0;
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#include "BulletDynamics/Dynamics/btRigidBody.h"
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//#define VERBOSE_RESIDUAL_PRINTF 1
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///This is the scalar reference implementation of solving a single constraint row, the innerloop of the Projected Gauss Seidel/Sequential Impulse constraint solver
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///Below are optional SSE2 and SSE4/FMA3 versions. We assume most hardware has SSE2. For SSE4/FMA3 we perform a CPU feature check.
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static btScalar gResolveSingleConstraintRowGeneric_scalar_reference(btSolverBody& bodyA, btSolverBody& bodyB, const btSolverConstraint& c)
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{
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btScalar deltaImpulse = c.m_rhs - btScalar(c.m_appliedImpulse)*c.m_cfm;
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const btScalar deltaVel1Dotn = c.m_contactNormal1.dot(bodyA.internalGetDeltaLinearVelocity()) + c.m_relpos1CrossNormal.dot(bodyA.internalGetDeltaAngularVelocity());
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const btScalar deltaVel2Dotn = c.m_contactNormal2.dot(bodyB.internalGetDeltaLinearVelocity()) + c.m_relpos2CrossNormal.dot(bodyB.internalGetDeltaAngularVelocity());
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// const btScalar delta_rel_vel = deltaVel1Dotn-deltaVel2Dotn;
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deltaImpulse -= deltaVel1Dotn*c.m_jacDiagABInv;
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deltaImpulse -= deltaVel2Dotn*c.m_jacDiagABInv;
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const btScalar sum = btScalar(c.m_appliedImpulse) + deltaImpulse;
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if (sum < c.m_lowerLimit)
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{
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deltaImpulse = c.m_lowerLimit - c.m_appliedImpulse;
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c.m_appliedImpulse = c.m_lowerLimit;
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}
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else if (sum > c.m_upperLimit)
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{
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deltaImpulse = c.m_upperLimit - c.m_appliedImpulse;
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c.m_appliedImpulse = c.m_upperLimit;
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}
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else
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{
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c.m_appliedImpulse = sum;
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}
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bodyA.internalApplyImpulse(c.m_contactNormal1*bodyA.internalGetInvMass(), c.m_angularComponentA, deltaImpulse);
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bodyB.internalApplyImpulse(c.m_contactNormal2*bodyB.internalGetInvMass(), c.m_angularComponentB, deltaImpulse);
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return deltaImpulse*(1./c.m_jacDiagABInv);
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}
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static btScalar gResolveSingleConstraintRowLowerLimit_scalar_reference(btSolverBody& bodyA, btSolverBody& bodyB, const btSolverConstraint& c)
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{
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btScalar deltaImpulse = c.m_rhs - btScalar(c.m_appliedImpulse)*c.m_cfm;
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const btScalar deltaVel1Dotn = c.m_contactNormal1.dot(bodyA.internalGetDeltaLinearVelocity()) + c.m_relpos1CrossNormal.dot(bodyA.internalGetDeltaAngularVelocity());
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const btScalar deltaVel2Dotn = c.m_contactNormal2.dot(bodyB.internalGetDeltaLinearVelocity()) + c.m_relpos2CrossNormal.dot(bodyB.internalGetDeltaAngularVelocity());
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deltaImpulse -= deltaVel1Dotn*c.m_jacDiagABInv;
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deltaImpulse -= deltaVel2Dotn*c.m_jacDiagABInv;
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const btScalar sum = btScalar(c.m_appliedImpulse) + deltaImpulse;
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if (sum < c.m_lowerLimit)
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{
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deltaImpulse = c.m_lowerLimit - c.m_appliedImpulse;
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c.m_appliedImpulse = c.m_lowerLimit;
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}
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else
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{
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c.m_appliedImpulse = sum;
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}
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bodyA.internalApplyImpulse(c.m_contactNormal1*bodyA.internalGetInvMass(), c.m_angularComponentA, deltaImpulse);
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bodyB.internalApplyImpulse(c.m_contactNormal2*bodyB.internalGetInvMass(), c.m_angularComponentB, deltaImpulse);
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return deltaImpulse*(1./c.m_jacDiagABInv);
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}
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#ifdef USE_SIMD
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#include <emmintrin.h>
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#define btVecSplat(x, e) _mm_shuffle_ps(x, x, _MM_SHUFFLE(e,e,e,e))
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static inline __m128 btSimdDot3( __m128 vec0, __m128 vec1 )
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{
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__m128 result = _mm_mul_ps( vec0, vec1);
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return _mm_add_ps( btVecSplat( result, 0 ), _mm_add_ps( btVecSplat( result, 1 ), btVecSplat( result, 2 ) ) );
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}
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#if defined (BT_ALLOW_SSE4)
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#include <intrin.h>
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#define USE_FMA 1
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#define USE_FMA3_INSTEAD_FMA4 1
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#define USE_SSE4_DOT 1
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#define SSE4_DP(a, b) _mm_dp_ps(a, b, 0x7f)
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#define SSE4_DP_FP(a, b) _mm_cvtss_f32(_mm_dp_ps(a, b, 0x7f))
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#if USE_SSE4_DOT
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#define DOT_PRODUCT(a, b) SSE4_DP(a, b)
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#else
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#define DOT_PRODUCT(a, b) btSimdDot3(a, b)
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#endif
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#if USE_FMA
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#if USE_FMA3_INSTEAD_FMA4
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// a*b + c
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#define FMADD(a, b, c) _mm_fmadd_ps(a, b, c)
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// -(a*b) + c
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#define FMNADD(a, b, c) _mm_fnmadd_ps(a, b, c)
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#else // USE_FMA3
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// a*b + c
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#define FMADD(a, b, c) _mm_macc_ps(a, b, c)
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// -(a*b) + c
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#define FMNADD(a, b, c) _mm_nmacc_ps(a, b, c)
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#endif
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#else // USE_FMA
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// c + a*b
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#define FMADD(a, b, c) _mm_add_ps(c, _mm_mul_ps(a, b))
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// c - a*b
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#define FMNADD(a, b, c) _mm_sub_ps(c, _mm_mul_ps(a, b))
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#endif
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#endif
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// Project Gauss Seidel or the equivalent Sequential Impulse
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static btScalar gResolveSingleConstraintRowGeneric_sse2(btSolverBody& bodyA, btSolverBody& bodyB, const btSolverConstraint& c)
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{
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__m128 cpAppliedImp = _mm_set1_ps(c.m_appliedImpulse);
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__m128 lowerLimit1 = _mm_set1_ps(c.m_lowerLimit);
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__m128 upperLimit1 = _mm_set1_ps(c.m_upperLimit);
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btSimdScalar deltaImpulse = _mm_sub_ps(_mm_set1_ps(c.m_rhs), _mm_mul_ps(_mm_set1_ps(c.m_appliedImpulse), _mm_set1_ps(c.m_cfm)));
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__m128 deltaVel1Dotn = _mm_add_ps(btSimdDot3(c.m_contactNormal1.mVec128, bodyA.internalGetDeltaLinearVelocity().mVec128), btSimdDot3(c.m_relpos1CrossNormal.mVec128, bodyA.internalGetDeltaAngularVelocity().mVec128));
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__m128 deltaVel2Dotn = _mm_add_ps(btSimdDot3(c.m_contactNormal2.mVec128, bodyB.internalGetDeltaLinearVelocity().mVec128), btSimdDot3(c.m_relpos2CrossNormal.mVec128, bodyB.internalGetDeltaAngularVelocity().mVec128));
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deltaImpulse = _mm_sub_ps(deltaImpulse, _mm_mul_ps(deltaVel1Dotn, _mm_set1_ps(c.m_jacDiagABInv)));
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deltaImpulse = _mm_sub_ps(deltaImpulse, _mm_mul_ps(deltaVel2Dotn, _mm_set1_ps(c.m_jacDiagABInv)));
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btSimdScalar sum = _mm_add_ps(cpAppliedImp, deltaImpulse);
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btSimdScalar resultLowerLess, resultUpperLess;
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resultLowerLess = _mm_cmplt_ps(sum, lowerLimit1);
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resultUpperLess = _mm_cmplt_ps(sum, upperLimit1);
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__m128 lowMinApplied = _mm_sub_ps(lowerLimit1, cpAppliedImp);
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deltaImpulse = _mm_or_ps(_mm_and_ps(resultLowerLess, lowMinApplied), _mm_andnot_ps(resultLowerLess, deltaImpulse));
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c.m_appliedImpulse = _mm_or_ps(_mm_and_ps(resultLowerLess, lowerLimit1), _mm_andnot_ps(resultLowerLess, sum));
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__m128 upperMinApplied = _mm_sub_ps(upperLimit1, cpAppliedImp);
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deltaImpulse = _mm_or_ps(_mm_and_ps(resultUpperLess, deltaImpulse), _mm_andnot_ps(resultUpperLess, upperMinApplied));
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c.m_appliedImpulse = _mm_or_ps(_mm_and_ps(resultUpperLess, c.m_appliedImpulse), _mm_andnot_ps(resultUpperLess, upperLimit1));
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__m128 linearComponentA = _mm_mul_ps(c.m_contactNormal1.mVec128, bodyA.internalGetInvMass().mVec128);
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__m128 linearComponentB = _mm_mul_ps((c.m_contactNormal2).mVec128, bodyB.internalGetInvMass().mVec128);
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__m128 impulseMagnitude = deltaImpulse;
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bodyA.internalGetDeltaLinearVelocity().mVec128 = _mm_add_ps(bodyA.internalGetDeltaLinearVelocity().mVec128, _mm_mul_ps(linearComponentA, impulseMagnitude));
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bodyA.internalGetDeltaAngularVelocity().mVec128 = _mm_add_ps(bodyA.internalGetDeltaAngularVelocity().mVec128, _mm_mul_ps(c.m_angularComponentA.mVec128, impulseMagnitude));
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bodyB.internalGetDeltaLinearVelocity().mVec128 = _mm_add_ps(bodyB.internalGetDeltaLinearVelocity().mVec128, _mm_mul_ps(linearComponentB, impulseMagnitude));
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bodyB.internalGetDeltaAngularVelocity().mVec128 = _mm_add_ps(bodyB.internalGetDeltaAngularVelocity().mVec128, _mm_mul_ps(c.m_angularComponentB.mVec128, impulseMagnitude));
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return deltaImpulse.m_floats[0]/c.m_jacDiagABInv;
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}
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// Enhanced version of gResolveSingleConstraintRowGeneric_sse2 with SSE4.1 and FMA3
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static btScalar gResolveSingleConstraintRowGeneric_sse4_1_fma3(btSolverBody& bodyA, btSolverBody& bodyB, const btSolverConstraint& c)
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{
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#if defined (BT_ALLOW_SSE4)
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__m128 tmp = _mm_set_ps1(c.m_jacDiagABInv);
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__m128 deltaImpulse = _mm_set_ps1(c.m_rhs - btScalar(c.m_appliedImpulse)*c.m_cfm);
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const __m128 lowerLimit = _mm_set_ps1(c.m_lowerLimit);
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const __m128 upperLimit = _mm_set_ps1(c.m_upperLimit);
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const __m128 deltaVel1Dotn = _mm_add_ps(DOT_PRODUCT(c.m_contactNormal1.mVec128, bodyA.internalGetDeltaLinearVelocity().mVec128), DOT_PRODUCT(c.m_relpos1CrossNormal.mVec128, bodyA.internalGetDeltaAngularVelocity().mVec128));
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const __m128 deltaVel2Dotn = _mm_add_ps(DOT_PRODUCT(c.m_contactNormal2.mVec128, bodyB.internalGetDeltaLinearVelocity().mVec128), DOT_PRODUCT(c.m_relpos2CrossNormal.mVec128, bodyB.internalGetDeltaAngularVelocity().mVec128));
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deltaImpulse = FMNADD(deltaVel1Dotn, tmp, deltaImpulse);
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deltaImpulse = FMNADD(deltaVel2Dotn, tmp, deltaImpulse);
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tmp = _mm_add_ps(c.m_appliedImpulse, deltaImpulse); // sum
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const __m128 maskLower = _mm_cmpgt_ps(tmp, lowerLimit);
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const __m128 maskUpper = _mm_cmpgt_ps(upperLimit, tmp);
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deltaImpulse = _mm_blendv_ps(_mm_sub_ps(lowerLimit, c.m_appliedImpulse), _mm_blendv_ps(_mm_sub_ps(upperLimit, c.m_appliedImpulse), deltaImpulse, maskUpper), maskLower);
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c.m_appliedImpulse = _mm_blendv_ps(lowerLimit, _mm_blendv_ps(upperLimit, tmp, maskUpper), maskLower);
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bodyA.internalGetDeltaLinearVelocity().mVec128 = FMADD(_mm_mul_ps(c.m_contactNormal1.mVec128, bodyA.internalGetInvMass().mVec128), deltaImpulse, bodyA.internalGetDeltaLinearVelocity().mVec128);
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bodyA.internalGetDeltaAngularVelocity().mVec128 = FMADD(c.m_angularComponentA.mVec128, deltaImpulse, bodyA.internalGetDeltaAngularVelocity().mVec128);
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bodyB.internalGetDeltaLinearVelocity().mVec128 = FMADD(_mm_mul_ps(c.m_contactNormal2.mVec128, bodyB.internalGetInvMass().mVec128), deltaImpulse, bodyB.internalGetDeltaLinearVelocity().mVec128);
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bodyB.internalGetDeltaAngularVelocity().mVec128 = FMADD(c.m_angularComponentB.mVec128, deltaImpulse, bodyB.internalGetDeltaAngularVelocity().mVec128);
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btSimdScalar deltaImp = deltaImpulse;
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return deltaImp.m_floats[0]*(1./c.m_jacDiagABInv);
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#else
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return gResolveSingleConstraintRowGeneric_sse2(bodyA,bodyB,c);
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#endif
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}
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static btScalar gResolveSingleConstraintRowLowerLimit_sse2(btSolverBody& bodyA, btSolverBody& bodyB, const btSolverConstraint& c)
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{
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__m128 cpAppliedImp = _mm_set1_ps(c.m_appliedImpulse);
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__m128 lowerLimit1 = _mm_set1_ps(c.m_lowerLimit);
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__m128 upperLimit1 = _mm_set1_ps(c.m_upperLimit);
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btSimdScalar deltaImpulse = _mm_sub_ps(_mm_set1_ps(c.m_rhs), _mm_mul_ps(_mm_set1_ps(c.m_appliedImpulse), _mm_set1_ps(c.m_cfm)));
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__m128 deltaVel1Dotn = _mm_add_ps(btSimdDot3(c.m_contactNormal1.mVec128, bodyA.internalGetDeltaLinearVelocity().mVec128), btSimdDot3(c.m_relpos1CrossNormal.mVec128, bodyA.internalGetDeltaAngularVelocity().mVec128));
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__m128 deltaVel2Dotn = _mm_add_ps(btSimdDot3(c.m_contactNormal2.mVec128, bodyB.internalGetDeltaLinearVelocity().mVec128), btSimdDot3(c.m_relpos2CrossNormal.mVec128, bodyB.internalGetDeltaAngularVelocity().mVec128));
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deltaImpulse = _mm_sub_ps(deltaImpulse, _mm_mul_ps(deltaVel1Dotn, _mm_set1_ps(c.m_jacDiagABInv)));
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deltaImpulse = _mm_sub_ps(deltaImpulse, _mm_mul_ps(deltaVel2Dotn, _mm_set1_ps(c.m_jacDiagABInv)));
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btSimdScalar sum = _mm_add_ps(cpAppliedImp, deltaImpulse);
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btSimdScalar resultLowerLess, resultUpperLess;
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resultLowerLess = _mm_cmplt_ps(sum, lowerLimit1);
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resultUpperLess = _mm_cmplt_ps(sum, upperLimit1);
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__m128 lowMinApplied = _mm_sub_ps(lowerLimit1, cpAppliedImp);
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deltaImpulse = _mm_or_ps(_mm_and_ps(resultLowerLess, lowMinApplied), _mm_andnot_ps(resultLowerLess, deltaImpulse));
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c.m_appliedImpulse = _mm_or_ps(_mm_and_ps(resultLowerLess, lowerLimit1), _mm_andnot_ps(resultLowerLess, sum));
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__m128 linearComponentA = _mm_mul_ps(c.m_contactNormal1.mVec128, bodyA.internalGetInvMass().mVec128);
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__m128 linearComponentB = _mm_mul_ps(c.m_contactNormal2.mVec128, bodyB.internalGetInvMass().mVec128);
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__m128 impulseMagnitude = deltaImpulse;
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bodyA.internalGetDeltaLinearVelocity().mVec128 = _mm_add_ps(bodyA.internalGetDeltaLinearVelocity().mVec128, _mm_mul_ps(linearComponentA, impulseMagnitude));
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bodyA.internalGetDeltaAngularVelocity().mVec128 = _mm_add_ps(bodyA.internalGetDeltaAngularVelocity().mVec128, _mm_mul_ps(c.m_angularComponentA.mVec128, impulseMagnitude));
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bodyB.internalGetDeltaLinearVelocity().mVec128 = _mm_add_ps(bodyB.internalGetDeltaLinearVelocity().mVec128, _mm_mul_ps(linearComponentB, impulseMagnitude));
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bodyB.internalGetDeltaAngularVelocity().mVec128 = _mm_add_ps(bodyB.internalGetDeltaAngularVelocity().mVec128, _mm_mul_ps(c.m_angularComponentB.mVec128, impulseMagnitude));
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return deltaImpulse.m_floats[0]/c.m_jacDiagABInv;
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}
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// Enhanced version of gResolveSingleConstraintRowGeneric_sse2 with SSE4.1 and FMA3
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static btScalar gResolveSingleConstraintRowLowerLimit_sse4_1_fma3(btSolverBody& bodyA, btSolverBody& bodyB, const btSolverConstraint& c)
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{
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#ifdef BT_ALLOW_SSE4
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__m128 tmp = _mm_set_ps1(c.m_jacDiagABInv);
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__m128 deltaImpulse = _mm_set_ps1(c.m_rhs - btScalar(c.m_appliedImpulse)*c.m_cfm);
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const __m128 lowerLimit = _mm_set_ps1(c.m_lowerLimit);
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const __m128 deltaVel1Dotn = _mm_add_ps(DOT_PRODUCT(c.m_contactNormal1.mVec128, bodyA.internalGetDeltaLinearVelocity().mVec128), DOT_PRODUCT(c.m_relpos1CrossNormal.mVec128, bodyA.internalGetDeltaAngularVelocity().mVec128));
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const __m128 deltaVel2Dotn = _mm_add_ps(DOT_PRODUCT(c.m_contactNormal2.mVec128, bodyB.internalGetDeltaLinearVelocity().mVec128), DOT_PRODUCT(c.m_relpos2CrossNormal.mVec128, bodyB.internalGetDeltaAngularVelocity().mVec128));
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deltaImpulse = FMNADD(deltaVel1Dotn, tmp, deltaImpulse);
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deltaImpulse = FMNADD(deltaVel2Dotn, tmp, deltaImpulse);
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tmp = _mm_add_ps(c.m_appliedImpulse, deltaImpulse);
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const __m128 mask = _mm_cmpgt_ps(tmp, lowerLimit);
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deltaImpulse = _mm_blendv_ps(_mm_sub_ps(lowerLimit, c.m_appliedImpulse), deltaImpulse, mask);
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c.m_appliedImpulse = _mm_blendv_ps(lowerLimit, tmp, mask);
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bodyA.internalGetDeltaLinearVelocity().mVec128 = FMADD(_mm_mul_ps(c.m_contactNormal1.mVec128, bodyA.internalGetInvMass().mVec128), deltaImpulse, bodyA.internalGetDeltaLinearVelocity().mVec128);
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bodyA.internalGetDeltaAngularVelocity().mVec128 = FMADD(c.m_angularComponentA.mVec128, deltaImpulse, bodyA.internalGetDeltaAngularVelocity().mVec128);
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bodyB.internalGetDeltaLinearVelocity().mVec128 = FMADD(_mm_mul_ps(c.m_contactNormal2.mVec128, bodyB.internalGetInvMass().mVec128), deltaImpulse, bodyB.internalGetDeltaLinearVelocity().mVec128);
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bodyB.internalGetDeltaAngularVelocity().mVec128 = FMADD(c.m_angularComponentB.mVec128, deltaImpulse, bodyB.internalGetDeltaAngularVelocity().mVec128);
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btSimdScalar deltaImp = deltaImpulse;
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return deltaImp.m_floats[0]*(1./c.m_jacDiagABInv);
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#else
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return gResolveSingleConstraintRowLowerLimit_sse2(bodyA,bodyB,c);
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#endif //BT_ALLOW_SSE4
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}
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#endif //USE_SIMD
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btScalar btSequentialImpulseConstraintSolver::resolveSingleConstraintRowGenericSIMD(btSolverBody& bodyA,btSolverBody& bodyB,const btSolverConstraint& c)
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{
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return m_resolveSingleConstraintRowGeneric(bodyA, bodyB, c);
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}
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// Project Gauss Seidel or the equivalent Sequential Impulse
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btScalar btSequentialImpulseConstraintSolver::resolveSingleConstraintRowGeneric(btSolverBody& bodyA,btSolverBody& bodyB,const btSolverConstraint& c)
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{
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return m_resolveSingleConstraintRowGeneric(bodyA, bodyB, c);
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}
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btScalar btSequentialImpulseConstraintSolver::resolveSingleConstraintRowLowerLimitSIMD(btSolverBody& bodyA,btSolverBody& bodyB,const btSolverConstraint& c)
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{
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return m_resolveSingleConstraintRowLowerLimit(bodyA, bodyB, c);
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}
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btScalar btSequentialImpulseConstraintSolver::resolveSingleConstraintRowLowerLimit(btSolverBody& bodyA,btSolverBody& bodyB,const btSolverConstraint& c)
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{
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return m_resolveSingleConstraintRowLowerLimit(bodyA, bodyB, c);
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}
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static btScalar gResolveSplitPenetrationImpulse_scalar_reference(
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btSolverBody& bodyA,
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btSolverBody& bodyB,
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|
const btSolverConstraint& c)
|
|
{
|
|
btScalar deltaImpulse = 0.f;
|
|
|
|
if (c.m_rhsPenetration)
|
|
{
|
|
gNumSplitImpulseRecoveries++;
|
|
deltaImpulse = c.m_rhsPenetration-btScalar(c.m_appliedPushImpulse)*c.m_cfm;
|
|
const btScalar deltaVel1Dotn = c.m_contactNormal1.dot(bodyA.internalGetPushVelocity()) + c.m_relpos1CrossNormal.dot(bodyA.internalGetTurnVelocity());
|
|
const btScalar deltaVel2Dotn = c.m_contactNormal2.dot(bodyB.internalGetPushVelocity()) + c.m_relpos2CrossNormal.dot(bodyB.internalGetTurnVelocity());
|
|
|
|
deltaImpulse -= deltaVel1Dotn*c.m_jacDiagABInv;
|
|
deltaImpulse -= deltaVel2Dotn*c.m_jacDiagABInv;
|
|
const btScalar sum = btScalar(c.m_appliedPushImpulse) + deltaImpulse;
|
|
if (sum < c.m_lowerLimit)
|
|
{
|
|
deltaImpulse = c.m_lowerLimit-c.m_appliedPushImpulse;
|
|
c.m_appliedPushImpulse = c.m_lowerLimit;
|
|
}
|
|
else
|
|
{
|
|
c.m_appliedPushImpulse = sum;
|
|
}
|
|
bodyA.internalApplyPushImpulse(c.m_contactNormal1*bodyA.internalGetInvMass(),c.m_angularComponentA,deltaImpulse);
|
|
bodyB.internalApplyPushImpulse(c.m_contactNormal2*bodyB.internalGetInvMass(),c.m_angularComponentB,deltaImpulse);
|
|
}
|
|
return deltaImpulse*(1./c.m_jacDiagABInv);
|
|
}
|
|
|
|
static btScalar gResolveSplitPenetrationImpulse_sse2(btSolverBody& bodyA,btSolverBody& bodyB,const btSolverConstraint& c)
|
|
{
|
|
#ifdef USE_SIMD
|
|
if (!c.m_rhsPenetration)
|
|
return 0.f;
|
|
|
|
gNumSplitImpulseRecoveries++;
|
|
|
|
__m128 cpAppliedImp = _mm_set1_ps(c.m_appliedPushImpulse);
|
|
__m128 lowerLimit1 = _mm_set1_ps(c.m_lowerLimit);
|
|
__m128 upperLimit1 = _mm_set1_ps(c.m_upperLimit);
|
|
__m128 deltaImpulse = _mm_sub_ps(_mm_set1_ps(c.m_rhsPenetration), _mm_mul_ps(_mm_set1_ps(c.m_appliedPushImpulse),_mm_set1_ps(c.m_cfm)));
|
|
__m128 deltaVel1Dotn = _mm_add_ps(btSimdDot3(c.m_contactNormal1.mVec128,bodyA.internalGetPushVelocity().mVec128), btSimdDot3(c.m_relpos1CrossNormal.mVec128,bodyA.internalGetTurnVelocity().mVec128));
|
|
__m128 deltaVel2Dotn = _mm_add_ps(btSimdDot3(c.m_contactNormal2.mVec128,bodyB.internalGetPushVelocity().mVec128), btSimdDot3(c.m_relpos2CrossNormal.mVec128,bodyB.internalGetTurnVelocity().mVec128));
|
|
deltaImpulse = _mm_sub_ps(deltaImpulse,_mm_mul_ps(deltaVel1Dotn,_mm_set1_ps(c.m_jacDiagABInv)));
|
|
deltaImpulse = _mm_sub_ps(deltaImpulse,_mm_mul_ps(deltaVel2Dotn,_mm_set1_ps(c.m_jacDiagABInv)));
|
|
btSimdScalar sum = _mm_add_ps(cpAppliedImp,deltaImpulse);
|
|
btSimdScalar resultLowerLess,resultUpperLess;
|
|
resultLowerLess = _mm_cmplt_ps(sum,lowerLimit1);
|
|
resultUpperLess = _mm_cmplt_ps(sum,upperLimit1);
|
|
__m128 lowMinApplied = _mm_sub_ps(lowerLimit1,cpAppliedImp);
|
|
deltaImpulse = _mm_or_ps( _mm_and_ps(resultLowerLess, lowMinApplied), _mm_andnot_ps(resultLowerLess, deltaImpulse) );
|
|
c.m_appliedPushImpulse = _mm_or_ps( _mm_and_ps(resultLowerLess, lowerLimit1), _mm_andnot_ps(resultLowerLess, sum) );
|
|
__m128 linearComponentA = _mm_mul_ps(c.m_contactNormal1.mVec128,bodyA.internalGetInvMass().mVec128);
|
|
__m128 linearComponentB = _mm_mul_ps(c.m_contactNormal2.mVec128,bodyB.internalGetInvMass().mVec128);
|
|
__m128 impulseMagnitude = deltaImpulse;
|
|
bodyA.internalGetPushVelocity().mVec128 = _mm_add_ps(bodyA.internalGetPushVelocity().mVec128,_mm_mul_ps(linearComponentA,impulseMagnitude));
|
|
bodyA.internalGetTurnVelocity().mVec128 = _mm_add_ps(bodyA.internalGetTurnVelocity().mVec128 ,_mm_mul_ps(c.m_angularComponentA.mVec128,impulseMagnitude));
|
|
bodyB.internalGetPushVelocity().mVec128 = _mm_add_ps(bodyB.internalGetPushVelocity().mVec128,_mm_mul_ps(linearComponentB,impulseMagnitude));
|
|
bodyB.internalGetTurnVelocity().mVec128 = _mm_add_ps(bodyB.internalGetTurnVelocity().mVec128 ,_mm_mul_ps(c.m_angularComponentB.mVec128,impulseMagnitude));
|
|
btSimdScalar deltaImp = deltaImpulse;
|
|
return deltaImp.m_floats[0] * (1. / c.m_jacDiagABInv);
|
|
#else
|
|
return gResolveSplitPenetrationImpulse_scalar_reference(bodyA,bodyB,c);
|
|
#endif
|
|
}
|
|
|
|
|
|
btSequentialImpulseConstraintSolver::btSequentialImpulseConstraintSolver()
|
|
{
|
|
m_btSeed2 = 0;
|
|
m_cachedSolverMode = 0;
|
|
setupSolverFunctions( false );
|
|
}
|
|
|
|
void btSequentialImpulseConstraintSolver::setupSolverFunctions( bool useSimd )
|
|
{
|
|
m_resolveSingleConstraintRowGeneric = gResolveSingleConstraintRowGeneric_scalar_reference;
|
|
m_resolveSingleConstraintRowLowerLimit = gResolveSingleConstraintRowLowerLimit_scalar_reference;
|
|
m_resolveSplitPenetrationImpulse = gResolveSplitPenetrationImpulse_scalar_reference;
|
|
|
|
if ( useSimd )
|
|
{
|
|
#ifdef USE_SIMD
|
|
m_resolveSingleConstraintRowGeneric = gResolveSingleConstraintRowGeneric_sse2;
|
|
m_resolveSingleConstraintRowLowerLimit = gResolveSingleConstraintRowLowerLimit_sse2;
|
|
m_resolveSplitPenetrationImpulse = gResolveSplitPenetrationImpulse_sse2;
|
|
|
|
#ifdef BT_ALLOW_SSE4
|
|
int cpuFeatures = btCpuFeatureUtility::getCpuFeatures();
|
|
if ((cpuFeatures & btCpuFeatureUtility::CPU_FEATURE_FMA3) && (cpuFeatures & btCpuFeatureUtility::CPU_FEATURE_SSE4_1))
|
|
{
|
|
m_resolveSingleConstraintRowGeneric = gResolveSingleConstraintRowGeneric_sse4_1_fma3;
|
|
m_resolveSingleConstraintRowLowerLimit = gResolveSingleConstraintRowLowerLimit_sse4_1_fma3;
|
|
}
|
|
#endif//BT_ALLOW_SSE4
|
|
#endif //USE_SIMD
|
|
}
|
|
}
|
|
|
|
btSequentialImpulseConstraintSolver::~btSequentialImpulseConstraintSolver()
|
|
{
|
|
}
|
|
|
|
btSingleConstraintRowSolver btSequentialImpulseConstraintSolver::getScalarConstraintRowSolverGeneric()
|
|
{
|
|
return gResolveSingleConstraintRowGeneric_scalar_reference;
|
|
}
|
|
|
|
btSingleConstraintRowSolver btSequentialImpulseConstraintSolver::getScalarConstraintRowSolverLowerLimit()
|
|
{
|
|
return gResolveSingleConstraintRowLowerLimit_scalar_reference;
|
|
}
|
|
|
|
|
|
#ifdef USE_SIMD
|
|
btSingleConstraintRowSolver btSequentialImpulseConstraintSolver::getSSE2ConstraintRowSolverGeneric()
|
|
{
|
|
return gResolveSingleConstraintRowGeneric_sse2;
|
|
}
|
|
btSingleConstraintRowSolver btSequentialImpulseConstraintSolver::getSSE2ConstraintRowSolverLowerLimit()
|
|
{
|
|
return gResolveSingleConstraintRowLowerLimit_sse2;
|
|
}
|
|
#ifdef BT_ALLOW_SSE4
|
|
btSingleConstraintRowSolver btSequentialImpulseConstraintSolver::getSSE4_1ConstraintRowSolverGeneric()
|
|
{
|
|
return gResolveSingleConstraintRowGeneric_sse4_1_fma3;
|
|
}
|
|
btSingleConstraintRowSolver btSequentialImpulseConstraintSolver::getSSE4_1ConstraintRowSolverLowerLimit()
|
|
{
|
|
return gResolveSingleConstraintRowLowerLimit_sse4_1_fma3;
|
|
}
|
|
#endif //BT_ALLOW_SSE4
|
|
#endif //USE_SIMD
|
|
|
|
unsigned long btSequentialImpulseConstraintSolver::btRand2()
|
|
{
|
|
m_btSeed2 = (1664525L*m_btSeed2 + 1013904223L) & 0xffffffff;
|
|
return m_btSeed2;
|
|
}
|
|
|
|
|
|
|
|
//See ODE: adam's all-int straightforward(?) dRandInt (0..n-1)
|
|
int btSequentialImpulseConstraintSolver::btRandInt2 (int n)
|
|
{
|
|
// seems good; xor-fold and modulus
|
|
const unsigned long un = static_cast<unsigned long>(n);
|
|
unsigned long r = btRand2();
|
|
|
|
// note: probably more aggressive than it needs to be -- might be
|
|
// able to get away without one or two of the innermost branches.
|
|
if (un <= 0x00010000UL) {
|
|
r ^= (r >> 16);
|
|
if (un <= 0x00000100UL) {
|
|
r ^= (r >> 8);
|
|
if (un <= 0x00000010UL) {
|
|
r ^= (r >> 4);
|
|
if (un <= 0x00000004UL) {
|
|
r ^= (r >> 2);
|
|
if (un <= 0x00000002UL) {
|
|
r ^= (r >> 1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return (int) (r % un);
|
|
}
|
|
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::initSolverBody(btSolverBody* solverBody, btCollisionObject* collisionObject, btScalar timeStep)
|
|
{
|
|
|
|
btRigidBody* rb = collisionObject? btRigidBody::upcast(collisionObject) : 0;
|
|
|
|
solverBody->internalGetDeltaLinearVelocity().setValue(0.f,0.f,0.f);
|
|
solverBody->internalGetDeltaAngularVelocity().setValue(0.f,0.f,0.f);
|
|
solverBody->internalGetPushVelocity().setValue(0.f,0.f,0.f);
|
|
solverBody->internalGetTurnVelocity().setValue(0.f,0.f,0.f);
|
|
|
|
if (rb)
|
|
{
|
|
solverBody->m_worldTransform = rb->getWorldTransform();
|
|
solverBody->internalSetInvMass(btVector3(rb->getInvMass(),rb->getInvMass(),rb->getInvMass())*rb->getLinearFactor());
|
|
solverBody->m_originalBody = rb;
|
|
solverBody->m_angularFactor = rb->getAngularFactor();
|
|
solverBody->m_linearFactor = rb->getLinearFactor();
|
|
solverBody->m_linearVelocity = rb->getLinearVelocity();
|
|
solverBody->m_angularVelocity = rb->getAngularVelocity();
|
|
solverBody->m_externalForceImpulse = rb->getTotalForce()*rb->getInvMass()*timeStep;
|
|
solverBody->m_externalTorqueImpulse = rb->getTotalTorque()*rb->getInvInertiaTensorWorld()*timeStep ;
|
|
|
|
} else
|
|
{
|
|
solverBody->m_worldTransform.setIdentity();
|
|
solverBody->internalSetInvMass(btVector3(0,0,0));
|
|
solverBody->m_originalBody = 0;
|
|
solverBody->m_angularFactor.setValue(1,1,1);
|
|
solverBody->m_linearFactor.setValue(1,1,1);
|
|
solverBody->m_linearVelocity.setValue(0,0,0);
|
|
solverBody->m_angularVelocity.setValue(0,0,0);
|
|
solverBody->m_externalForceImpulse.setValue(0,0,0);
|
|
solverBody->m_externalTorqueImpulse.setValue(0,0,0);
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
btScalar btSequentialImpulseConstraintSolver::restitutionCurve(btScalar rel_vel, btScalar restitution, btScalar velocityThreshold)
|
|
{
|
|
//printf("rel_vel =%f\n", rel_vel);
|
|
if (btFabs(rel_vel)<velocityThreshold)
|
|
return 0.;
|
|
|
|
btScalar rest = restitution * -rel_vel;
|
|
return rest;
|
|
}
|
|
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::applyAnisotropicFriction(btCollisionObject* colObj,btVector3& frictionDirection, int frictionMode)
|
|
{
|
|
|
|
|
|
if (colObj && colObj->hasAnisotropicFriction(frictionMode))
|
|
{
|
|
// transform to local coordinates
|
|
btVector3 loc_lateral = frictionDirection * colObj->getWorldTransform().getBasis();
|
|
const btVector3& friction_scaling = colObj->getAnisotropicFriction();
|
|
//apply anisotropic friction
|
|
loc_lateral *= friction_scaling;
|
|
// ... and transform it back to global coordinates
|
|
frictionDirection = colObj->getWorldTransform().getBasis() * loc_lateral;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::setupFrictionConstraint(btSolverConstraint& solverConstraint, const btVector3& normalAxis,int solverBodyIdA,int solverBodyIdB,btManifoldPoint& cp,const btVector3& rel_pos1,const btVector3& rel_pos2,btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, const btContactSolverInfo& infoGlobal, btScalar desiredVelocity, btScalar cfmSlip)
|
|
{
|
|
|
|
|
|
btSolverBody& solverBodyA = m_tmpSolverBodyPool[solverBodyIdA];
|
|
btSolverBody& solverBodyB = m_tmpSolverBodyPool[solverBodyIdB];
|
|
|
|
btRigidBody* body0 = m_tmpSolverBodyPool[solverBodyIdA].m_originalBody;
|
|
btRigidBody* bodyA = m_tmpSolverBodyPool[solverBodyIdB].m_originalBody;
|
|
|
|
solverConstraint.m_solverBodyIdA = solverBodyIdA;
|
|
solverConstraint.m_solverBodyIdB = solverBodyIdB;
|
|
|
|
solverConstraint.m_friction = cp.m_combinedFriction;
|
|
solverConstraint.m_originalContactPoint = 0;
|
|
|
|
solverConstraint.m_appliedImpulse = 0.f;
|
|
solverConstraint.m_appliedPushImpulse = 0.f;
|
|
|
|
if (body0)
|
|
{
|
|
solverConstraint.m_contactNormal1 = normalAxis;
|
|
btVector3 ftorqueAxis1 = rel_pos1.cross(solverConstraint.m_contactNormal1);
|
|
solverConstraint.m_relpos1CrossNormal = ftorqueAxis1;
|
|
solverConstraint.m_angularComponentA = body0->getInvInertiaTensorWorld()*ftorqueAxis1*body0->getAngularFactor();
|
|
}else
|
|
{
|
|
solverConstraint.m_contactNormal1.setZero();
|
|
solverConstraint.m_relpos1CrossNormal.setZero();
|
|
solverConstraint.m_angularComponentA .setZero();
|
|
}
|
|
|
|
if (bodyA)
|
|
{
|
|
solverConstraint.m_contactNormal2 = -normalAxis;
|
|
btVector3 ftorqueAxis1 = rel_pos2.cross(solverConstraint.m_contactNormal2);
|
|
solverConstraint.m_relpos2CrossNormal = ftorqueAxis1;
|
|
solverConstraint.m_angularComponentB = bodyA->getInvInertiaTensorWorld()*ftorqueAxis1*bodyA->getAngularFactor();
|
|
} else
|
|
{
|
|
solverConstraint.m_contactNormal2.setZero();
|
|
solverConstraint.m_relpos2CrossNormal.setZero();
|
|
solverConstraint.m_angularComponentB.setZero();
|
|
}
|
|
|
|
{
|
|
btVector3 vec;
|
|
btScalar denom0 = 0.f;
|
|
btScalar denom1 = 0.f;
|
|
if (body0)
|
|
{
|
|
vec = ( solverConstraint.m_angularComponentA).cross(rel_pos1);
|
|
denom0 = body0->getInvMass() + normalAxis.dot(vec);
|
|
}
|
|
if (bodyA)
|
|
{
|
|
vec = ( -solverConstraint.m_angularComponentB).cross(rel_pos2);
|
|
denom1 = bodyA->getInvMass() + normalAxis.dot(vec);
|
|
}
|
|
btScalar denom = relaxation/(denom0+denom1);
|
|
solverConstraint.m_jacDiagABInv = denom;
|
|
}
|
|
|
|
{
|
|
|
|
|
|
btScalar rel_vel;
|
|
btScalar vel1Dotn = solverConstraint.m_contactNormal1.dot(body0?solverBodyA.m_linearVelocity+solverBodyA.m_externalForceImpulse:btVector3(0,0,0))
|
|
+ solverConstraint.m_relpos1CrossNormal.dot(body0?solverBodyA.m_angularVelocity:btVector3(0,0,0));
|
|
btScalar vel2Dotn = solverConstraint.m_contactNormal2.dot(bodyA?solverBodyB.m_linearVelocity+solverBodyB.m_externalForceImpulse:btVector3(0,0,0))
|
|
+ solverConstraint.m_relpos2CrossNormal.dot(bodyA?solverBodyB.m_angularVelocity:btVector3(0,0,0));
|
|
|
|
rel_vel = vel1Dotn+vel2Dotn;
|
|
|
|
// btScalar positionalError = 0.f;
|
|
|
|
btScalar velocityError = desiredVelocity - rel_vel;
|
|
btScalar velocityImpulse = velocityError * solverConstraint.m_jacDiagABInv;
|
|
|
|
btScalar penetrationImpulse = btScalar(0);
|
|
|
|
if (cp.m_contactPointFlags & BT_CONTACT_FLAG_FRICTION_ANCHOR)
|
|
{
|
|
btScalar distance = (cp.getPositionWorldOnA() - cp.getPositionWorldOnB()).dot(normalAxis);
|
|
btScalar positionalError = -distance * infoGlobal.m_frictionERP/infoGlobal.m_timeStep;
|
|
penetrationImpulse = positionalError*solverConstraint.m_jacDiagABInv;
|
|
}
|
|
|
|
solverConstraint.m_rhs = penetrationImpulse + velocityImpulse;
|
|
solverConstraint.m_rhsPenetration = 0.f;
|
|
solverConstraint.m_cfm = cfmSlip;
|
|
solverConstraint.m_lowerLimit = -solverConstraint.m_friction;
|
|
solverConstraint.m_upperLimit = solverConstraint.m_friction;
|
|
|
|
}
|
|
}
|
|
|
|
btSolverConstraint& btSequentialImpulseConstraintSolver::addFrictionConstraint(const btVector3& normalAxis,int solverBodyIdA,int solverBodyIdB,int frictionIndex,btManifoldPoint& cp,const btVector3& rel_pos1,const btVector3& rel_pos2,btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, const btContactSolverInfo& infoGlobal, btScalar desiredVelocity, btScalar cfmSlip)
|
|
{
|
|
btSolverConstraint& solverConstraint = m_tmpSolverContactFrictionConstraintPool.expandNonInitializing();
|
|
solverConstraint.m_frictionIndex = frictionIndex;
|
|
setupFrictionConstraint(solverConstraint, normalAxis, solverBodyIdA, solverBodyIdB, cp, rel_pos1, rel_pos2,
|
|
colObj0, colObj1, relaxation, infoGlobal, desiredVelocity, cfmSlip);
|
|
return solverConstraint;
|
|
}
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::setupTorsionalFrictionConstraint( btSolverConstraint& solverConstraint, const btVector3& normalAxis1,int solverBodyIdA,int solverBodyIdB,
|
|
btManifoldPoint& cp,btScalar combinedTorsionalFriction, const btVector3& rel_pos1,const btVector3& rel_pos2,
|
|
btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation,
|
|
btScalar desiredVelocity, btScalar cfmSlip)
|
|
|
|
{
|
|
btVector3 normalAxis(0,0,0);
|
|
|
|
|
|
solverConstraint.m_contactNormal1 = normalAxis;
|
|
solverConstraint.m_contactNormal2 = -normalAxis;
|
|
btSolverBody& solverBodyA = m_tmpSolverBodyPool[solverBodyIdA];
|
|
btSolverBody& solverBodyB = m_tmpSolverBodyPool[solverBodyIdB];
|
|
|
|
btRigidBody* body0 = m_tmpSolverBodyPool[solverBodyIdA].m_originalBody;
|
|
btRigidBody* bodyA = m_tmpSolverBodyPool[solverBodyIdB].m_originalBody;
|
|
|
|
solverConstraint.m_solverBodyIdA = solverBodyIdA;
|
|
solverConstraint.m_solverBodyIdB = solverBodyIdB;
|
|
|
|
solverConstraint.m_friction = combinedTorsionalFriction;
|
|
solverConstraint.m_originalContactPoint = 0;
|
|
|
|
solverConstraint.m_appliedImpulse = 0.f;
|
|
solverConstraint.m_appliedPushImpulse = 0.f;
|
|
|
|
{
|
|
btVector3 ftorqueAxis1 = -normalAxis1;
|
|
solverConstraint.m_relpos1CrossNormal = ftorqueAxis1;
|
|
solverConstraint.m_angularComponentA = body0 ? body0->getInvInertiaTensorWorld()*ftorqueAxis1*body0->getAngularFactor() : btVector3(0,0,0);
|
|
}
|
|
{
|
|
btVector3 ftorqueAxis1 = normalAxis1;
|
|
solverConstraint.m_relpos2CrossNormal = ftorqueAxis1;
|
|
solverConstraint.m_angularComponentB = bodyA ? bodyA->getInvInertiaTensorWorld()*ftorqueAxis1*bodyA->getAngularFactor() : btVector3(0,0,0);
|
|
}
|
|
|
|
|
|
{
|
|
btVector3 iMJaA = body0?body0->getInvInertiaTensorWorld()*solverConstraint.m_relpos1CrossNormal:btVector3(0,0,0);
|
|
btVector3 iMJaB = bodyA?bodyA->getInvInertiaTensorWorld()*solverConstraint.m_relpos2CrossNormal:btVector3(0,0,0);
|
|
btScalar sum = 0;
|
|
sum += iMJaA.dot(solverConstraint.m_relpos1CrossNormal);
|
|
sum += iMJaB.dot(solverConstraint.m_relpos2CrossNormal);
|
|
solverConstraint.m_jacDiagABInv = btScalar(1.)/sum;
|
|
}
|
|
|
|
{
|
|
|
|
|
|
btScalar rel_vel;
|
|
btScalar vel1Dotn = solverConstraint.m_contactNormal1.dot(body0?solverBodyA.m_linearVelocity+solverBodyA.m_externalForceImpulse:btVector3(0,0,0))
|
|
+ solverConstraint.m_relpos1CrossNormal.dot(body0?solverBodyA.m_angularVelocity:btVector3(0,0,0));
|
|
btScalar vel2Dotn = solverConstraint.m_contactNormal2.dot(bodyA?solverBodyB.m_linearVelocity+solverBodyB.m_externalForceImpulse:btVector3(0,0,0))
|
|
+ solverConstraint.m_relpos2CrossNormal.dot(bodyA?solverBodyB.m_angularVelocity:btVector3(0,0,0));
|
|
|
|
rel_vel = vel1Dotn+vel2Dotn;
|
|
|
|
// btScalar positionalError = 0.f;
|
|
|
|
btSimdScalar velocityError = desiredVelocity - rel_vel;
|
|
btSimdScalar velocityImpulse = velocityError * btSimdScalar(solverConstraint.m_jacDiagABInv);
|
|
solverConstraint.m_rhs = velocityImpulse;
|
|
solverConstraint.m_cfm = cfmSlip;
|
|
solverConstraint.m_lowerLimit = -solverConstraint.m_friction;
|
|
solverConstraint.m_upperLimit = solverConstraint.m_friction;
|
|
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
btSolverConstraint& btSequentialImpulseConstraintSolver::addTorsionalFrictionConstraint(const btVector3& normalAxis,int solverBodyIdA,int solverBodyIdB,int frictionIndex,btManifoldPoint& cp,btScalar combinedTorsionalFriction, const btVector3& rel_pos1,const btVector3& rel_pos2,btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, btScalar desiredVelocity, btScalar cfmSlip)
|
|
{
|
|
btSolverConstraint& solverConstraint = m_tmpSolverContactRollingFrictionConstraintPool.expandNonInitializing();
|
|
solverConstraint.m_frictionIndex = frictionIndex;
|
|
setupTorsionalFrictionConstraint(solverConstraint, normalAxis, solverBodyIdA, solverBodyIdB, cp, combinedTorsionalFriction,rel_pos1, rel_pos2,
|
|
colObj0, colObj1, relaxation, desiredVelocity, cfmSlip);
|
|
return solverConstraint;
|
|
}
|
|
|
|
|
|
int btSequentialImpulseConstraintSolver::getOrInitSolverBody(btCollisionObject& body,btScalar timeStep)
|
|
{
|
|
#if BT_THREADSAFE
|
|
int solverBodyId = -1;
|
|
bool isRigidBodyType = btRigidBody::upcast( &body ) != NULL;
|
|
if ( isRigidBodyType && !body.isStaticOrKinematicObject() )
|
|
{
|
|
// dynamic body
|
|
// Dynamic bodies can only be in one island, so it's safe to write to the companionId
|
|
solverBodyId = body.getCompanionId();
|
|
if ( solverBodyId < 0 )
|
|
{
|
|
solverBodyId = m_tmpSolverBodyPool.size();
|
|
btSolverBody& solverBody = m_tmpSolverBodyPool.expand();
|
|
initSolverBody( &solverBody, &body, timeStep );
|
|
body.setCompanionId( solverBodyId );
|
|
}
|
|
}
|
|
else if (isRigidBodyType && body.isKinematicObject())
|
|
{
|
|
//
|
|
// NOTE: must test for kinematic before static because some kinematic objects also
|
|
// identify as "static"
|
|
//
|
|
// Kinematic bodies can be in multiple islands at once, so it is a
|
|
// race condition to write to them, so we use an alternate method
|
|
// to record the solverBodyId
|
|
int uniqueId = body.getWorldArrayIndex();
|
|
const int INVALID_SOLVER_BODY_ID = -1;
|
|
if (uniqueId >= m_kinematicBodyUniqueIdToSolverBodyTable.size())
|
|
{
|
|
m_kinematicBodyUniqueIdToSolverBodyTable.resize(uniqueId + 1, INVALID_SOLVER_BODY_ID);
|
|
}
|
|
solverBodyId = m_kinematicBodyUniqueIdToSolverBodyTable[ uniqueId ];
|
|
// if no table entry yet,
|
|
if ( solverBodyId == INVALID_SOLVER_BODY_ID )
|
|
{
|
|
// create a table entry for this body
|
|
solverBodyId = m_tmpSolverBodyPool.size();
|
|
btSolverBody& solverBody = m_tmpSolverBodyPool.expand();
|
|
initSolverBody( &solverBody, &body, timeStep );
|
|
m_kinematicBodyUniqueIdToSolverBodyTable[ uniqueId ] = solverBodyId;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
bool isMultiBodyType = (body.getInternalType()&btCollisionObject::CO_FEATHERSTONE_LINK);
|
|
// Incorrectly set collision object flags can degrade performance in various ways.
|
|
if (!isMultiBodyType)
|
|
{
|
|
btAssert( body.isStaticOrKinematicObject() );
|
|
}
|
|
//it could be a multibody link collider
|
|
// all fixed bodies (inf mass) get mapped to a single solver id
|
|
if ( m_fixedBodyId < 0 )
|
|
{
|
|
m_fixedBodyId = m_tmpSolverBodyPool.size();
|
|
btSolverBody& fixedBody = m_tmpSolverBodyPool.expand();
|
|
initSolverBody( &fixedBody, 0, timeStep );
|
|
}
|
|
solverBodyId = m_fixedBodyId;
|
|
}
|
|
btAssert( solverBodyId >= 0 && solverBodyId < m_tmpSolverBodyPool.size() );
|
|
return solverBodyId;
|
|
#else // BT_THREADSAFE
|
|
|
|
int solverBodyIdA = -1;
|
|
|
|
if (body.getCompanionId() >= 0)
|
|
{
|
|
//body has already been converted
|
|
solverBodyIdA = body.getCompanionId();
|
|
btAssert(solverBodyIdA < m_tmpSolverBodyPool.size());
|
|
} else
|
|
{
|
|
btRigidBody* rb = btRigidBody::upcast(&body);
|
|
//convert both active and kinematic objects (for their velocity)
|
|
if (rb && (rb->getInvMass() || rb->isKinematicObject()))
|
|
{
|
|
solverBodyIdA = m_tmpSolverBodyPool.size();
|
|
btSolverBody& solverBody = m_tmpSolverBodyPool.expand();
|
|
initSolverBody(&solverBody,&body,timeStep);
|
|
body.setCompanionId(solverBodyIdA);
|
|
} else
|
|
{
|
|
|
|
if (m_fixedBodyId<0)
|
|
{
|
|
m_fixedBodyId = m_tmpSolverBodyPool.size();
|
|
btSolverBody& fixedBody = m_tmpSolverBodyPool.expand();
|
|
initSolverBody(&fixedBody,0,timeStep);
|
|
}
|
|
return m_fixedBodyId;
|
|
// return 0;//assume first one is a fixed solver body
|
|
}
|
|
}
|
|
|
|
return solverBodyIdA;
|
|
#endif // BT_THREADSAFE
|
|
|
|
}
|
|
#include <stdio.h>
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::setupContactConstraint(btSolverConstraint& solverConstraint,
|
|
int solverBodyIdA, int solverBodyIdB,
|
|
btManifoldPoint& cp, const btContactSolverInfo& infoGlobal,
|
|
btScalar& relaxation,
|
|
const btVector3& rel_pos1, const btVector3& rel_pos2)
|
|
{
|
|
|
|
// const btVector3& pos1 = cp.getPositionWorldOnA();
|
|
// const btVector3& pos2 = cp.getPositionWorldOnB();
|
|
|
|
btSolverBody* bodyA = &m_tmpSolverBodyPool[solverBodyIdA];
|
|
btSolverBody* bodyB = &m_tmpSolverBodyPool[solverBodyIdB];
|
|
|
|
btRigidBody* rb0 = bodyA->m_originalBody;
|
|
btRigidBody* rb1 = bodyB->m_originalBody;
|
|
|
|
// btVector3 rel_pos1 = pos1 - colObj0->getWorldTransform().getOrigin();
|
|
// btVector3 rel_pos2 = pos2 - colObj1->getWorldTransform().getOrigin();
|
|
//rel_pos1 = pos1 - bodyA->getWorldTransform().getOrigin();
|
|
//rel_pos2 = pos2 - bodyB->getWorldTransform().getOrigin();
|
|
|
|
relaxation = infoGlobal.m_sor;
|
|
btScalar invTimeStep = btScalar(1)/infoGlobal.m_timeStep;
|
|
|
|
//cfm = 1 / ( dt * kp + kd )
|
|
//erp = dt * kp / ( dt * kp + kd )
|
|
|
|
btScalar cfm = infoGlobal.m_globalCfm;
|
|
btScalar erp = infoGlobal.m_erp2;
|
|
|
|
if ((cp.m_contactPointFlags&BT_CONTACT_FLAG_HAS_CONTACT_CFM) || (cp.m_contactPointFlags&BT_CONTACT_FLAG_HAS_CONTACT_ERP))
|
|
{
|
|
if (cp.m_contactPointFlags&BT_CONTACT_FLAG_HAS_CONTACT_CFM)
|
|
cfm = cp.m_contactCFM;
|
|
if (cp.m_contactPointFlags&BT_CONTACT_FLAG_HAS_CONTACT_ERP)
|
|
erp = cp.m_contactERP;
|
|
} else
|
|
{
|
|
if (cp.m_contactPointFlags & BT_CONTACT_FLAG_CONTACT_STIFFNESS_DAMPING)
|
|
{
|
|
btScalar denom = ( infoGlobal.m_timeStep * cp.m_combinedContactStiffness1 + cp.m_combinedContactDamping1 );
|
|
if (denom < SIMD_EPSILON)
|
|
{
|
|
denom = SIMD_EPSILON;
|
|
}
|
|
cfm = btScalar(1) / denom;
|
|
erp = (infoGlobal.m_timeStep * cp.m_combinedContactStiffness1) / denom;
|
|
}
|
|
}
|
|
|
|
cfm *= invTimeStep;
|
|
|
|
|
|
btVector3 torqueAxis0 = rel_pos1.cross(cp.m_normalWorldOnB);
|
|
solverConstraint.m_angularComponentA = rb0 ? rb0->getInvInertiaTensorWorld()*torqueAxis0*rb0->getAngularFactor() : btVector3(0,0,0);
|
|
btVector3 torqueAxis1 = rel_pos2.cross(cp.m_normalWorldOnB);
|
|
solverConstraint.m_angularComponentB = rb1 ? rb1->getInvInertiaTensorWorld()*-torqueAxis1*rb1->getAngularFactor() : btVector3(0,0,0);
|
|
|
|
{
|
|
#ifdef COMPUTE_IMPULSE_DENOM
|
|
btScalar denom0 = rb0->computeImpulseDenominator(pos1,cp.m_normalWorldOnB);
|
|
btScalar denom1 = rb1->computeImpulseDenominator(pos2,cp.m_normalWorldOnB);
|
|
#else
|
|
btVector3 vec;
|
|
btScalar denom0 = 0.f;
|
|
btScalar denom1 = 0.f;
|
|
if (rb0)
|
|
{
|
|
vec = ( solverConstraint.m_angularComponentA).cross(rel_pos1);
|
|
denom0 = rb0->getInvMass() + cp.m_normalWorldOnB.dot(vec);
|
|
}
|
|
if (rb1)
|
|
{
|
|
vec = ( -solverConstraint.m_angularComponentB).cross(rel_pos2);
|
|
denom1 = rb1->getInvMass() + cp.m_normalWorldOnB.dot(vec);
|
|
}
|
|
#endif //COMPUTE_IMPULSE_DENOM
|
|
|
|
btScalar denom = relaxation/(denom0+denom1+cfm);
|
|
solverConstraint.m_jacDiagABInv = denom;
|
|
}
|
|
|
|
if (rb0)
|
|
{
|
|
solverConstraint.m_contactNormal1 = cp.m_normalWorldOnB;
|
|
solverConstraint.m_relpos1CrossNormal = torqueAxis0;
|
|
} else
|
|
{
|
|
solverConstraint.m_contactNormal1.setZero();
|
|
solverConstraint.m_relpos1CrossNormal.setZero();
|
|
}
|
|
if (rb1)
|
|
{
|
|
solverConstraint.m_contactNormal2 = -cp.m_normalWorldOnB;
|
|
solverConstraint.m_relpos2CrossNormal = -torqueAxis1;
|
|
}else
|
|
{
|
|
solverConstraint.m_contactNormal2.setZero();
|
|
solverConstraint.m_relpos2CrossNormal.setZero();
|
|
}
|
|
|
|
btScalar restitution = 0.f;
|
|
btScalar penetration = cp.getDistance()+infoGlobal.m_linearSlop;
|
|
|
|
{
|
|
btVector3 vel1,vel2;
|
|
|
|
vel1 = rb0? rb0->getVelocityInLocalPoint(rel_pos1) : btVector3(0,0,0);
|
|
vel2 = rb1? rb1->getVelocityInLocalPoint(rel_pos2) : btVector3(0,0,0);
|
|
|
|
// btVector3 vel2 = rb1 ? rb1->getVelocityInLocalPoint(rel_pos2) : btVector3(0,0,0);
|
|
btVector3 vel = vel1 - vel2;
|
|
btScalar rel_vel = cp.m_normalWorldOnB.dot(vel);
|
|
|
|
|
|
|
|
solverConstraint.m_friction = cp.m_combinedFriction;
|
|
|
|
|
|
restitution = restitutionCurve(rel_vel, cp.m_combinedRestitution, infoGlobal.m_restitutionVelocityThreshold);
|
|
if (restitution <= btScalar(0.))
|
|
{
|
|
restitution = 0.f;
|
|
};
|
|
}
|
|
|
|
|
|
///warm starting (or zero if disabled)
|
|
if (infoGlobal.m_solverMode & SOLVER_USE_WARMSTARTING)
|
|
{
|
|
solverConstraint.m_appliedImpulse = cp.m_appliedImpulse * infoGlobal.m_warmstartingFactor;
|
|
if (rb0)
|
|
bodyA->internalApplyImpulse(solverConstraint.m_contactNormal1*bodyA->internalGetInvMass()*rb0->getLinearFactor(),solverConstraint.m_angularComponentA,solverConstraint.m_appliedImpulse);
|
|
if (rb1)
|
|
bodyB->internalApplyImpulse(-solverConstraint.m_contactNormal2*bodyB->internalGetInvMass()*rb1->getLinearFactor(),-solverConstraint.m_angularComponentB,-(btScalar)solverConstraint.m_appliedImpulse);
|
|
} else
|
|
{
|
|
solverConstraint.m_appliedImpulse = 0.f;
|
|
}
|
|
|
|
solverConstraint.m_appliedPushImpulse = 0.f;
|
|
|
|
{
|
|
|
|
btVector3 externalForceImpulseA = bodyA->m_originalBody ? bodyA->m_externalForceImpulse: btVector3(0,0,0);
|
|
btVector3 externalTorqueImpulseA = bodyA->m_originalBody ? bodyA->m_externalTorqueImpulse: btVector3(0,0,0);
|
|
btVector3 externalForceImpulseB = bodyB->m_originalBody ? bodyB->m_externalForceImpulse: btVector3(0,0,0);
|
|
btVector3 externalTorqueImpulseB = bodyB->m_originalBody ?bodyB->m_externalTorqueImpulse : btVector3(0,0,0);
|
|
|
|
|
|
btScalar vel1Dotn = solverConstraint.m_contactNormal1.dot(bodyA->m_linearVelocity+externalForceImpulseA)
|
|
+ solverConstraint.m_relpos1CrossNormal.dot(bodyA->m_angularVelocity+externalTorqueImpulseA);
|
|
btScalar vel2Dotn = solverConstraint.m_contactNormal2.dot(bodyB->m_linearVelocity+externalForceImpulseB)
|
|
+ solverConstraint.m_relpos2CrossNormal.dot(bodyB->m_angularVelocity+externalTorqueImpulseB);
|
|
btScalar rel_vel = vel1Dotn+vel2Dotn;
|
|
|
|
btScalar positionalError = 0.f;
|
|
btScalar velocityError = restitution - rel_vel;// * damping;
|
|
|
|
|
|
|
|
if (penetration>0)
|
|
{
|
|
positionalError = 0;
|
|
|
|
velocityError -= penetration *invTimeStep;
|
|
} else
|
|
{
|
|
positionalError = -penetration * erp*invTimeStep;
|
|
|
|
}
|
|
|
|
btScalar penetrationImpulse = positionalError*solverConstraint.m_jacDiagABInv;
|
|
btScalar velocityImpulse = velocityError *solverConstraint.m_jacDiagABInv;
|
|
|
|
if (!infoGlobal.m_splitImpulse || (penetration > infoGlobal.m_splitImpulsePenetrationThreshold))
|
|
{
|
|
//combine position and velocity into rhs
|
|
solverConstraint.m_rhs = penetrationImpulse+velocityImpulse;//-solverConstraint.m_contactNormal1.dot(bodyA->m_externalForce*bodyA->m_invMass-bodyB->m_externalForce/bodyB->m_invMass)*solverConstraint.m_jacDiagABInv;
|
|
solverConstraint.m_rhsPenetration = 0.f;
|
|
|
|
} else
|
|
{
|
|
//split position and velocity into rhs and m_rhsPenetration
|
|
solverConstraint.m_rhs = velocityImpulse;
|
|
solverConstraint.m_rhsPenetration = penetrationImpulse;
|
|
}
|
|
solverConstraint.m_cfm = cfm*solverConstraint.m_jacDiagABInv;
|
|
solverConstraint.m_lowerLimit = 0;
|
|
solverConstraint.m_upperLimit = 1e10f;
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::setFrictionConstraintImpulse( btSolverConstraint& solverConstraint,
|
|
int solverBodyIdA, int solverBodyIdB,
|
|
btManifoldPoint& cp, const btContactSolverInfo& infoGlobal)
|
|
{
|
|
|
|
btSolverBody* bodyA = &m_tmpSolverBodyPool[solverBodyIdA];
|
|
btSolverBody* bodyB = &m_tmpSolverBodyPool[solverBodyIdB];
|
|
|
|
btRigidBody* rb0 = bodyA->m_originalBody;
|
|
btRigidBody* rb1 = bodyB->m_originalBody;
|
|
|
|
{
|
|
btSolverConstraint& frictionConstraint1 = m_tmpSolverContactFrictionConstraintPool[solverConstraint.m_frictionIndex];
|
|
if (infoGlobal.m_solverMode & SOLVER_USE_WARMSTARTING)
|
|
{
|
|
frictionConstraint1.m_appliedImpulse = cp.m_appliedImpulseLateral1 * infoGlobal.m_warmstartingFactor;
|
|
if (rb0)
|
|
bodyA->internalApplyImpulse(frictionConstraint1.m_contactNormal1*rb0->getInvMass()*rb0->getLinearFactor(),frictionConstraint1.m_angularComponentA,frictionConstraint1.m_appliedImpulse);
|
|
if (rb1)
|
|
bodyB->internalApplyImpulse(-frictionConstraint1.m_contactNormal2*rb1->getInvMass()*rb1->getLinearFactor(),-frictionConstraint1.m_angularComponentB,-(btScalar)frictionConstraint1.m_appliedImpulse);
|
|
} else
|
|
{
|
|
frictionConstraint1.m_appliedImpulse = 0.f;
|
|
}
|
|
}
|
|
|
|
if ((infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS))
|
|
{
|
|
btSolverConstraint& frictionConstraint2 = m_tmpSolverContactFrictionConstraintPool[solverConstraint.m_frictionIndex+1];
|
|
if (infoGlobal.m_solverMode & SOLVER_USE_WARMSTARTING)
|
|
{
|
|
frictionConstraint2.m_appliedImpulse = cp.m_appliedImpulseLateral2 * infoGlobal.m_warmstartingFactor;
|
|
if (rb0)
|
|
bodyA->internalApplyImpulse(frictionConstraint2.m_contactNormal1*rb0->getInvMass(),frictionConstraint2.m_angularComponentA,frictionConstraint2.m_appliedImpulse);
|
|
if (rb1)
|
|
bodyB->internalApplyImpulse(-frictionConstraint2.m_contactNormal2*rb1->getInvMass(),-frictionConstraint2.m_angularComponentB,-(btScalar)frictionConstraint2.m_appliedImpulse);
|
|
} else
|
|
{
|
|
frictionConstraint2.m_appliedImpulse = 0.f;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::convertContact(btPersistentManifold* manifold,const btContactSolverInfo& infoGlobal)
|
|
{
|
|
btCollisionObject* colObj0=0,*colObj1=0;
|
|
|
|
colObj0 = (btCollisionObject*)manifold->getBody0();
|
|
colObj1 = (btCollisionObject*)manifold->getBody1();
|
|
|
|
int solverBodyIdA = getOrInitSolverBody(*colObj0,infoGlobal.m_timeStep);
|
|
int solverBodyIdB = getOrInitSolverBody(*colObj1,infoGlobal.m_timeStep);
|
|
|
|
// btRigidBody* bodyA = btRigidBody::upcast(colObj0);
|
|
// btRigidBody* bodyB = btRigidBody::upcast(colObj1);
|
|
|
|
btSolverBody* solverBodyA = &m_tmpSolverBodyPool[solverBodyIdA];
|
|
btSolverBody* solverBodyB = &m_tmpSolverBodyPool[solverBodyIdB];
|
|
|
|
|
|
|
|
///avoid collision response between two static objects
|
|
if (!solverBodyA || (solverBodyA->m_invMass.fuzzyZero() && (!solverBodyB || solverBodyB->m_invMass.fuzzyZero())))
|
|
return;
|
|
|
|
int rollingFriction=1;
|
|
for (int j=0;j<manifold->getNumContacts();j++)
|
|
{
|
|
|
|
btManifoldPoint& cp = manifold->getContactPoint(j);
|
|
|
|
if (cp.getDistance() <= manifold->getContactProcessingThreshold())
|
|
{
|
|
btVector3 rel_pos1;
|
|
btVector3 rel_pos2;
|
|
btScalar relaxation;
|
|
|
|
|
|
int frictionIndex = m_tmpSolverContactConstraintPool.size();
|
|
btSolverConstraint& solverConstraint = m_tmpSolverContactConstraintPool.expandNonInitializing();
|
|
solverConstraint.m_solverBodyIdA = solverBodyIdA;
|
|
solverConstraint.m_solverBodyIdB = solverBodyIdB;
|
|
|
|
solverConstraint.m_originalContactPoint = &cp;
|
|
|
|
const btVector3& pos1 = cp.getPositionWorldOnA();
|
|
const btVector3& pos2 = cp.getPositionWorldOnB();
|
|
|
|
rel_pos1 = pos1 - colObj0->getWorldTransform().getOrigin();
|
|
rel_pos2 = pos2 - colObj1->getWorldTransform().getOrigin();
|
|
|
|
btVector3 vel1;
|
|
btVector3 vel2;
|
|
|
|
solverBodyA->getVelocityInLocalPointNoDelta(rel_pos1,vel1);
|
|
solverBodyB->getVelocityInLocalPointNoDelta(rel_pos2,vel2 );
|
|
|
|
btVector3 vel = vel1 - vel2;
|
|
btScalar rel_vel = cp.m_normalWorldOnB.dot(vel);
|
|
|
|
setupContactConstraint(solverConstraint, solverBodyIdA, solverBodyIdB, cp, infoGlobal, relaxation, rel_pos1, rel_pos2);
|
|
|
|
|
|
|
|
|
|
/////setup the friction constraints
|
|
|
|
solverConstraint.m_frictionIndex = m_tmpSolverContactFrictionConstraintPool.size();
|
|
|
|
if ((cp.m_combinedRollingFriction>0.f) && (rollingFriction>0))
|
|
{
|
|
|
|
{
|
|
addTorsionalFrictionConstraint(cp.m_normalWorldOnB,solverBodyIdA,solverBodyIdB,frictionIndex,cp,cp.m_combinedSpinningFriction, rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
|
|
btVector3 axis0,axis1;
|
|
btPlaneSpace1(cp.m_normalWorldOnB,axis0,axis1);
|
|
axis0.normalize();
|
|
axis1.normalize();
|
|
|
|
applyAnisotropicFriction(colObj0,axis0,btCollisionObject::CF_ANISOTROPIC_ROLLING_FRICTION);
|
|
applyAnisotropicFriction(colObj1,axis0,btCollisionObject::CF_ANISOTROPIC_ROLLING_FRICTION);
|
|
applyAnisotropicFriction(colObj0,axis1,btCollisionObject::CF_ANISOTROPIC_ROLLING_FRICTION);
|
|
applyAnisotropicFriction(colObj1,axis1,btCollisionObject::CF_ANISOTROPIC_ROLLING_FRICTION);
|
|
if (axis0.length()>0.001)
|
|
addTorsionalFrictionConstraint(axis0,solverBodyIdA,solverBodyIdB,frictionIndex,cp,
|
|
cp.m_combinedRollingFriction, rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
|
|
if (axis1.length()>0.001)
|
|
addTorsionalFrictionConstraint(axis1,solverBodyIdA,solverBodyIdB,frictionIndex,cp,
|
|
cp.m_combinedRollingFriction, rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
|
|
|
|
}
|
|
}
|
|
|
|
///Bullet has several options to set the friction directions
|
|
///By default, each contact has only a single friction direction that is recomputed automatically very frame
|
|
///based on the relative linear velocity.
|
|
///If the relative velocity it zero, it will automatically compute a friction direction.
|
|
|
|
///You can also enable two friction directions, using the SOLVER_USE_2_FRICTION_DIRECTIONS.
|
|
///In that case, the second friction direction will be orthogonal to both contact normal and first friction direction.
|
|
///
|
|
///If you choose SOLVER_DISABLE_VELOCITY_DEPENDENT_FRICTION_DIRECTION, then the friction will be independent from the relative projected velocity.
|
|
///
|
|
///The user can manually override the friction directions for certain contacts using a contact callback,
|
|
///and set the cp.m_lateralFrictionInitialized to true
|
|
///In that case, you can set the target relative motion in each friction direction (cp.m_contactMotion1 and cp.m_contactMotion2)
|
|
///this will give a conveyor belt effect
|
|
///
|
|
|
|
if (!(infoGlobal.m_solverMode & SOLVER_ENABLE_FRICTION_DIRECTION_CACHING) || !(cp.m_contactPointFlags&BT_CONTACT_FLAG_LATERAL_FRICTION_INITIALIZED))
|
|
{
|
|
cp.m_lateralFrictionDir1 = vel - cp.m_normalWorldOnB * rel_vel;
|
|
btScalar lat_rel_vel = cp.m_lateralFrictionDir1.length2();
|
|
if (!(infoGlobal.m_solverMode & SOLVER_DISABLE_VELOCITY_DEPENDENT_FRICTION_DIRECTION) && lat_rel_vel > SIMD_EPSILON)
|
|
{
|
|
cp.m_lateralFrictionDir1 *= 1.f/btSqrt(lat_rel_vel);
|
|
applyAnisotropicFriction(colObj0,cp.m_lateralFrictionDir1,btCollisionObject::CF_ANISOTROPIC_FRICTION);
|
|
applyAnisotropicFriction(colObj1,cp.m_lateralFrictionDir1,btCollisionObject::CF_ANISOTROPIC_FRICTION);
|
|
addFrictionConstraint(cp.m_lateralFrictionDir1,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation,infoGlobal);
|
|
|
|
if((infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS))
|
|
{
|
|
cp.m_lateralFrictionDir2 = cp.m_lateralFrictionDir1.cross(cp.m_normalWorldOnB);
|
|
cp.m_lateralFrictionDir2.normalize();//??
|
|
applyAnisotropicFriction(colObj0,cp.m_lateralFrictionDir2,btCollisionObject::CF_ANISOTROPIC_FRICTION);
|
|
applyAnisotropicFriction(colObj1,cp.m_lateralFrictionDir2,btCollisionObject::CF_ANISOTROPIC_FRICTION);
|
|
addFrictionConstraint(cp.m_lateralFrictionDir2,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation, infoGlobal);
|
|
}
|
|
|
|
} else
|
|
{
|
|
btPlaneSpace1(cp.m_normalWorldOnB,cp.m_lateralFrictionDir1,cp.m_lateralFrictionDir2);
|
|
|
|
applyAnisotropicFriction(colObj0,cp.m_lateralFrictionDir1,btCollisionObject::CF_ANISOTROPIC_FRICTION);
|
|
applyAnisotropicFriction(colObj1,cp.m_lateralFrictionDir1,btCollisionObject::CF_ANISOTROPIC_FRICTION);
|
|
addFrictionConstraint(cp.m_lateralFrictionDir1,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation, infoGlobal);
|
|
|
|
if ((infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS))
|
|
{
|
|
applyAnisotropicFriction(colObj0,cp.m_lateralFrictionDir2,btCollisionObject::CF_ANISOTROPIC_FRICTION);
|
|
applyAnisotropicFriction(colObj1,cp.m_lateralFrictionDir2,btCollisionObject::CF_ANISOTROPIC_FRICTION);
|
|
addFrictionConstraint(cp.m_lateralFrictionDir2,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation, infoGlobal);
|
|
}
|
|
|
|
|
|
if ((infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS) && (infoGlobal.m_solverMode & SOLVER_DISABLE_VELOCITY_DEPENDENT_FRICTION_DIRECTION))
|
|
{
|
|
cp.m_contactPointFlags|=BT_CONTACT_FLAG_LATERAL_FRICTION_INITIALIZED;
|
|
}
|
|
}
|
|
|
|
} else
|
|
{
|
|
addFrictionConstraint(cp.m_lateralFrictionDir1,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation, infoGlobal, cp.m_contactMotion1, cp.m_frictionCFM);
|
|
|
|
if ((infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS))
|
|
addFrictionConstraint(cp.m_lateralFrictionDir2,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation, infoGlobal, cp.m_contactMotion2, cp.m_frictionCFM);
|
|
|
|
}
|
|
setFrictionConstraintImpulse( solverConstraint, solverBodyIdA, solverBodyIdB, cp, infoGlobal);
|
|
|
|
|
|
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
void btSequentialImpulseConstraintSolver::convertContacts(btPersistentManifold** manifoldPtr,int numManifolds, const btContactSolverInfo& infoGlobal)
|
|
{
|
|
int i;
|
|
btPersistentManifold* manifold = 0;
|
|
// btCollisionObject* colObj0=0,*colObj1=0;
|
|
|
|
|
|
for (i=0;i<numManifolds;i++)
|
|
{
|
|
manifold = manifoldPtr[i];
|
|
convertContact(manifold,infoGlobal);
|
|
}
|
|
}
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::convertJoint(btSolverConstraint* currentConstraintRow,
|
|
btTypedConstraint* constraint,
|
|
const btTypedConstraint::btConstraintInfo1& info1,
|
|
int solverBodyIdA,
|
|
int solverBodyIdB,
|
|
const btContactSolverInfo& infoGlobal
|
|
)
|
|
{
|
|
const btRigidBody& rbA = constraint->getRigidBodyA();
|
|
const btRigidBody& rbB = constraint->getRigidBodyB();
|
|
|
|
const btSolverBody* bodyAPtr = &m_tmpSolverBodyPool[solverBodyIdA];
|
|
const btSolverBody* bodyBPtr = &m_tmpSolverBodyPool[solverBodyIdB];
|
|
|
|
int overrideNumSolverIterations = constraint->getOverrideNumSolverIterations() > 0 ? constraint->getOverrideNumSolverIterations() : infoGlobal.m_numIterations;
|
|
if (overrideNumSolverIterations>m_maxOverrideNumSolverIterations)
|
|
m_maxOverrideNumSolverIterations = overrideNumSolverIterations;
|
|
|
|
for (int j=0;j<info1.m_numConstraintRows;j++)
|
|
{
|
|
memset(¤tConstraintRow[j],0,sizeof(btSolverConstraint));
|
|
currentConstraintRow[j].m_lowerLimit = -SIMD_INFINITY;
|
|
currentConstraintRow[j].m_upperLimit = SIMD_INFINITY;
|
|
currentConstraintRow[j].m_appliedImpulse = 0.f;
|
|
currentConstraintRow[j].m_appliedPushImpulse = 0.f;
|
|
currentConstraintRow[j].m_solverBodyIdA = solverBodyIdA;
|
|
currentConstraintRow[j].m_solverBodyIdB = solverBodyIdB;
|
|
currentConstraintRow[j].m_overrideNumSolverIterations = overrideNumSolverIterations;
|
|
}
|
|
|
|
// these vectors are already cleared in initSolverBody, no need to redundantly clear again
|
|
btAssert(bodyAPtr->getDeltaLinearVelocity().isZero());
|
|
btAssert(bodyAPtr->getDeltaAngularVelocity().isZero());
|
|
btAssert(bodyAPtr->getPushVelocity().isZero());
|
|
btAssert(bodyAPtr->getTurnVelocity().isZero());
|
|
btAssert(bodyBPtr->getDeltaLinearVelocity().isZero());
|
|
btAssert(bodyBPtr->getDeltaAngularVelocity().isZero());
|
|
btAssert(bodyBPtr->getPushVelocity().isZero());
|
|
btAssert(bodyBPtr->getTurnVelocity().isZero());
|
|
//bodyAPtr->internalGetDeltaLinearVelocity().setValue(0.f,0.f,0.f);
|
|
//bodyAPtr->internalGetDeltaAngularVelocity().setValue(0.f,0.f,0.f);
|
|
//bodyAPtr->internalGetPushVelocity().setValue(0.f,0.f,0.f);
|
|
//bodyAPtr->internalGetTurnVelocity().setValue(0.f,0.f,0.f);
|
|
//bodyBPtr->internalGetDeltaLinearVelocity().setValue(0.f,0.f,0.f);
|
|
//bodyBPtr->internalGetDeltaAngularVelocity().setValue(0.f,0.f,0.f);
|
|
//bodyBPtr->internalGetPushVelocity().setValue(0.f,0.f,0.f);
|
|
//bodyBPtr->internalGetTurnVelocity().setValue(0.f,0.f,0.f);
|
|
|
|
|
|
btTypedConstraint::btConstraintInfo2 info2;
|
|
info2.fps = 1.f/infoGlobal.m_timeStep;
|
|
info2.erp = infoGlobal.m_erp;
|
|
info2.m_J1linearAxis = currentConstraintRow->m_contactNormal1;
|
|
info2.m_J1angularAxis = currentConstraintRow->m_relpos1CrossNormal;
|
|
info2.m_J2linearAxis = currentConstraintRow->m_contactNormal2;
|
|
info2.m_J2angularAxis = currentConstraintRow->m_relpos2CrossNormal;
|
|
info2.rowskip = sizeof(btSolverConstraint)/sizeof(btScalar);//check this
|
|
///the size of btSolverConstraint needs be a multiple of btScalar
|
|
btAssert(info2.rowskip*sizeof(btScalar)== sizeof(btSolverConstraint));
|
|
info2.m_constraintError = ¤tConstraintRow->m_rhs;
|
|
currentConstraintRow->m_cfm = infoGlobal.m_globalCfm;
|
|
info2.m_damping = infoGlobal.m_damping;
|
|
info2.cfm = ¤tConstraintRow->m_cfm;
|
|
info2.m_lowerLimit = ¤tConstraintRow->m_lowerLimit;
|
|
info2.m_upperLimit = ¤tConstraintRow->m_upperLimit;
|
|
info2.m_numIterations = infoGlobal.m_numIterations;
|
|
constraint->getInfo2(&info2);
|
|
|
|
///finalize the constraint setup
|
|
for (int j=0;j<info1.m_numConstraintRows;j++)
|
|
{
|
|
btSolverConstraint& solverConstraint = currentConstraintRow[j];
|
|
|
|
if (solverConstraint.m_upperLimit>=constraint->getBreakingImpulseThreshold())
|
|
{
|
|
solverConstraint.m_upperLimit = constraint->getBreakingImpulseThreshold();
|
|
}
|
|
|
|
if (solverConstraint.m_lowerLimit<=-constraint->getBreakingImpulseThreshold())
|
|
{
|
|
solverConstraint.m_lowerLimit = -constraint->getBreakingImpulseThreshold();
|
|
}
|
|
|
|
solverConstraint.m_originalContactPoint = constraint;
|
|
|
|
{
|
|
const btVector3& ftorqueAxis1 = solverConstraint.m_relpos1CrossNormal;
|
|
solverConstraint.m_angularComponentA = constraint->getRigidBodyA().getInvInertiaTensorWorld()*ftorqueAxis1*constraint->getRigidBodyA().getAngularFactor();
|
|
}
|
|
{
|
|
const btVector3& ftorqueAxis2 = solverConstraint.m_relpos2CrossNormal;
|
|
solverConstraint.m_angularComponentB = constraint->getRigidBodyB().getInvInertiaTensorWorld()*ftorqueAxis2*constraint->getRigidBodyB().getAngularFactor();
|
|
}
|
|
|
|
{
|
|
btVector3 iMJlA = solverConstraint.m_contactNormal1*rbA.getInvMass();
|
|
btVector3 iMJaA = rbA.getInvInertiaTensorWorld()*solverConstraint.m_relpos1CrossNormal;
|
|
btVector3 iMJlB = solverConstraint.m_contactNormal2*rbB.getInvMass();//sign of normal?
|
|
btVector3 iMJaB = rbB.getInvInertiaTensorWorld()*solverConstraint.m_relpos2CrossNormal;
|
|
|
|
btScalar sum = iMJlA.dot(solverConstraint.m_contactNormal1);
|
|
sum += iMJaA.dot(solverConstraint.m_relpos1CrossNormal);
|
|
sum += iMJlB.dot(solverConstraint.m_contactNormal2);
|
|
sum += iMJaB.dot(solverConstraint.m_relpos2CrossNormal);
|
|
btScalar fsum = btFabs(sum);
|
|
btAssert(fsum > SIMD_EPSILON);
|
|
btScalar sorRelaxation = 1.f;//todo: get from globalInfo?
|
|
solverConstraint.m_jacDiagABInv = fsum>SIMD_EPSILON?sorRelaxation/sum : 0.f;
|
|
}
|
|
|
|
{
|
|
btScalar rel_vel;
|
|
btVector3 externalForceImpulseA = bodyAPtr->m_originalBody ? bodyAPtr->m_externalForceImpulse : btVector3(0,0,0);
|
|
btVector3 externalTorqueImpulseA = bodyAPtr->m_originalBody ? bodyAPtr->m_externalTorqueImpulse : btVector3(0,0,0);
|
|
|
|
btVector3 externalForceImpulseB = bodyBPtr->m_originalBody ? bodyBPtr->m_externalForceImpulse : btVector3(0,0,0);
|
|
btVector3 externalTorqueImpulseB = bodyBPtr->m_originalBody ?bodyBPtr->m_externalTorqueImpulse : btVector3(0,0,0);
|
|
|
|
btScalar vel1Dotn = solverConstraint.m_contactNormal1.dot(rbA.getLinearVelocity()+externalForceImpulseA)
|
|
+ solverConstraint.m_relpos1CrossNormal.dot(rbA.getAngularVelocity()+externalTorqueImpulseA);
|
|
|
|
btScalar vel2Dotn = solverConstraint.m_contactNormal2.dot(rbB.getLinearVelocity()+externalForceImpulseB)
|
|
+ solverConstraint.m_relpos2CrossNormal.dot(rbB.getAngularVelocity()+externalTorqueImpulseB);
|
|
|
|
rel_vel = vel1Dotn+vel2Dotn;
|
|
btScalar restitution = 0.f;
|
|
btScalar positionalError = solverConstraint.m_rhs;//already filled in by getConstraintInfo2
|
|
btScalar velocityError = restitution - rel_vel * info2.m_damping;
|
|
btScalar penetrationImpulse = positionalError*solverConstraint.m_jacDiagABInv;
|
|
btScalar velocityImpulse = velocityError *solverConstraint.m_jacDiagABInv;
|
|
solverConstraint.m_rhs = penetrationImpulse+velocityImpulse;
|
|
solverConstraint.m_appliedImpulse = 0.f;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::convertJoints(btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& infoGlobal)
|
|
{
|
|
BT_PROFILE("convertJoints");
|
|
for (int j=0;j<numConstraints;j++)
|
|
{
|
|
btTypedConstraint* constraint = constraints[j];
|
|
constraint->buildJacobian();
|
|
constraint->internalSetAppliedImpulse(0.0f);
|
|
}
|
|
|
|
int totalNumRows = 0;
|
|
|
|
m_tmpConstraintSizesPool.resizeNoInitialize(numConstraints);
|
|
//calculate the total number of contraint rows
|
|
for (int i=0;i<numConstraints;i++)
|
|
{
|
|
btTypedConstraint::btConstraintInfo1& info1 = m_tmpConstraintSizesPool[i];
|
|
btJointFeedback* fb = constraints[i]->getJointFeedback();
|
|
if (fb)
|
|
{
|
|
fb->m_appliedForceBodyA.setZero();
|
|
fb->m_appliedTorqueBodyA.setZero();
|
|
fb->m_appliedForceBodyB.setZero();
|
|
fb->m_appliedTorqueBodyB.setZero();
|
|
}
|
|
|
|
if (constraints[i]->isEnabled())
|
|
{
|
|
constraints[i]->getInfo1(&info1);
|
|
} else
|
|
{
|
|
info1.m_numConstraintRows = 0;
|
|
info1.nub = 0;
|
|
}
|
|
totalNumRows += info1.m_numConstraintRows;
|
|
}
|
|
m_tmpSolverNonContactConstraintPool.resizeNoInitialize(totalNumRows);
|
|
|
|
|
|
///setup the btSolverConstraints
|
|
int currentRow = 0;
|
|
|
|
for (int i=0;i<numConstraints;i++)
|
|
{
|
|
const btTypedConstraint::btConstraintInfo1& info1 = m_tmpConstraintSizesPool[i];
|
|
|
|
if (info1.m_numConstraintRows)
|
|
{
|
|
btAssert(currentRow<totalNumRows);
|
|
|
|
btSolverConstraint* currentConstraintRow = &m_tmpSolverNonContactConstraintPool[currentRow];
|
|
btTypedConstraint* constraint = constraints[i];
|
|
btRigidBody& rbA = constraint->getRigidBodyA();
|
|
btRigidBody& rbB = constraint->getRigidBodyB();
|
|
|
|
int solverBodyIdA = getOrInitSolverBody(rbA,infoGlobal.m_timeStep);
|
|
int solverBodyIdB = getOrInitSolverBody(rbB,infoGlobal.m_timeStep);
|
|
|
|
convertJoint(currentConstraintRow, constraint, info1, solverBodyIdA, solverBodyIdB, infoGlobal);
|
|
}
|
|
currentRow+=info1.m_numConstraintRows;
|
|
}
|
|
}
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::convertBodies(btCollisionObject** bodies, int numBodies, const btContactSolverInfo& infoGlobal)
|
|
{
|
|
BT_PROFILE("convertBodies");
|
|
for (int i = 0; i < numBodies; i++)
|
|
{
|
|
bodies[i]->setCompanionId(-1);
|
|
}
|
|
#if BT_THREADSAFE
|
|
m_kinematicBodyUniqueIdToSolverBodyTable.resize( 0 );
|
|
#endif // BT_THREADSAFE
|
|
|
|
m_tmpSolverBodyPool.reserve(numBodies+1);
|
|
m_tmpSolverBodyPool.resize(0);
|
|
|
|
//btSolverBody& fixedBody = m_tmpSolverBodyPool.expand();
|
|
//initSolverBody(&fixedBody,0);
|
|
|
|
for (int i=0;i<numBodies;i++)
|
|
{
|
|
int bodyId = getOrInitSolverBody(*bodies[i],infoGlobal.m_timeStep);
|
|
|
|
btRigidBody* body = btRigidBody::upcast(bodies[i]);
|
|
if (body && body->getInvMass())
|
|
{
|
|
btSolverBody& solverBody = m_tmpSolverBodyPool[bodyId];
|
|
btVector3 gyroForce (0,0,0);
|
|
if (body->getFlags()&BT_ENABLE_GYROSCOPIC_FORCE_EXPLICIT)
|
|
{
|
|
gyroForce = body->computeGyroscopicForceExplicit(infoGlobal.m_maxGyroscopicForce);
|
|
solverBody.m_externalTorqueImpulse -= gyroForce*body->getInvInertiaTensorWorld()*infoGlobal.m_timeStep;
|
|
}
|
|
if (body->getFlags()&BT_ENABLE_GYROSCOPIC_FORCE_IMPLICIT_WORLD)
|
|
{
|
|
gyroForce = body->computeGyroscopicImpulseImplicit_World(infoGlobal.m_timeStep);
|
|
solverBody.m_externalTorqueImpulse += gyroForce;
|
|
}
|
|
if (body->getFlags()&BT_ENABLE_GYROSCOPIC_FORCE_IMPLICIT_BODY)
|
|
{
|
|
gyroForce = body->computeGyroscopicImpulseImplicit_Body(infoGlobal.m_timeStep);
|
|
solverBody.m_externalTorqueImpulse += gyroForce;
|
|
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
btScalar btSequentialImpulseConstraintSolver::solveGroupCacheFriendlySetup(btCollisionObject** bodies, int numBodies, btPersistentManifold** manifoldPtr, int numManifolds,btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& infoGlobal,btIDebugDraw* debugDrawer)
|
|
{
|
|
m_fixedBodyId = -1;
|
|
BT_PROFILE("solveGroupCacheFriendlySetup");
|
|
(void)debugDrawer;
|
|
|
|
// if solver mode has changed,
|
|
if ( infoGlobal.m_solverMode != m_cachedSolverMode )
|
|
{
|
|
// update solver functions to use SIMD or non-SIMD
|
|
bool useSimd = !!( infoGlobal.m_solverMode & SOLVER_SIMD );
|
|
setupSolverFunctions( useSimd );
|
|
m_cachedSolverMode = infoGlobal.m_solverMode;
|
|
}
|
|
m_maxOverrideNumSolverIterations = 0;
|
|
|
|
#ifdef BT_ADDITIONAL_DEBUG
|
|
//make sure that dynamic bodies exist for all (enabled) constraints
|
|
for (int i=0;i<numConstraints;i++)
|
|
{
|
|
btTypedConstraint* constraint = constraints[i];
|
|
if (constraint->isEnabled())
|
|
{
|
|
if (!constraint->getRigidBodyA().isStaticOrKinematicObject())
|
|
{
|
|
bool found=false;
|
|
for (int b=0;b<numBodies;b++)
|
|
{
|
|
|
|
if (&constraint->getRigidBodyA()==bodies[b])
|
|
{
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
btAssert(found);
|
|
}
|
|
if (!constraint->getRigidBodyB().isStaticOrKinematicObject())
|
|
{
|
|
bool found=false;
|
|
for (int b=0;b<numBodies;b++)
|
|
{
|
|
if (&constraint->getRigidBodyB()==bodies[b])
|
|
{
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
btAssert(found);
|
|
}
|
|
}
|
|
}
|
|
//make sure that dynamic bodies exist for all contact manifolds
|
|
for (int i=0;i<numManifolds;i++)
|
|
{
|
|
if (!manifoldPtr[i]->getBody0()->isStaticOrKinematicObject())
|
|
{
|
|
bool found=false;
|
|
for (int b=0;b<numBodies;b++)
|
|
{
|
|
|
|
if (manifoldPtr[i]->getBody0()==bodies[b])
|
|
{
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
btAssert(found);
|
|
}
|
|
if (!manifoldPtr[i]->getBody1()->isStaticOrKinematicObject())
|
|
{
|
|
bool found=false;
|
|
for (int b=0;b<numBodies;b++)
|
|
{
|
|
if (manifoldPtr[i]->getBody1()==bodies[b])
|
|
{
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
btAssert(found);
|
|
}
|
|
}
|
|
#endif //BT_ADDITIONAL_DEBUG
|
|
|
|
|
|
//convert all bodies
|
|
convertBodies(bodies, numBodies, infoGlobal);
|
|
|
|
convertJoints(constraints, numConstraints, infoGlobal);
|
|
|
|
convertContacts(manifoldPtr,numManifolds,infoGlobal);
|
|
|
|
|
|
// btContactSolverInfo info = infoGlobal;
|
|
|
|
|
|
int numNonContactPool = m_tmpSolverNonContactConstraintPool.size();
|
|
int numConstraintPool = m_tmpSolverContactConstraintPool.size();
|
|
int numFrictionPool = m_tmpSolverContactFrictionConstraintPool.size();
|
|
|
|
///@todo: use stack allocator for such temporarily memory, same for solver bodies/constraints
|
|
m_orderNonContactConstraintPool.resizeNoInitialize(numNonContactPool);
|
|
if ((infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS))
|
|
m_orderTmpConstraintPool.resizeNoInitialize(numConstraintPool*2);
|
|
else
|
|
m_orderTmpConstraintPool.resizeNoInitialize(numConstraintPool);
|
|
|
|
m_orderFrictionConstraintPool.resizeNoInitialize(numFrictionPool);
|
|
{
|
|
int i;
|
|
for (i=0;i<numNonContactPool;i++)
|
|
{
|
|
m_orderNonContactConstraintPool[i] = i;
|
|
}
|
|
for (i=0;i<numConstraintPool;i++)
|
|
{
|
|
m_orderTmpConstraintPool[i] = i;
|
|
}
|
|
for (i=0;i<numFrictionPool;i++)
|
|
{
|
|
m_orderFrictionConstraintPool[i] = i;
|
|
}
|
|
}
|
|
|
|
return 0.f;
|
|
|
|
}
|
|
|
|
|
|
btScalar btSequentialImpulseConstraintSolver::solveSingleIteration(int iteration, btCollisionObject** /*bodies */,int /*numBodies*/,btPersistentManifold** /*manifoldPtr*/, int /*numManifolds*/,btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& infoGlobal,btIDebugDraw* /*debugDrawer*/)
|
|
{
|
|
BT_PROFILE("solveSingleIteration");
|
|
btScalar leastSquaresResidual = 0.f;
|
|
|
|
int numNonContactPool = m_tmpSolverNonContactConstraintPool.size();
|
|
int numConstraintPool = m_tmpSolverContactConstraintPool.size();
|
|
int numFrictionPool = m_tmpSolverContactFrictionConstraintPool.size();
|
|
|
|
if (infoGlobal.m_solverMode & SOLVER_RANDMIZE_ORDER)
|
|
{
|
|
if (1) // uncomment this for a bit less random ((iteration & 7) == 0)
|
|
{
|
|
|
|
for (int j=0; j<numNonContactPool; ++j) {
|
|
int tmp = m_orderNonContactConstraintPool[j];
|
|
int swapi = btRandInt2(j+1);
|
|
m_orderNonContactConstraintPool[j] = m_orderNonContactConstraintPool[swapi];
|
|
m_orderNonContactConstraintPool[swapi] = tmp;
|
|
}
|
|
|
|
//contact/friction constraints are not solved more than
|
|
if (iteration< infoGlobal.m_numIterations)
|
|
{
|
|
for (int j=0; j<numConstraintPool; ++j) {
|
|
int tmp = m_orderTmpConstraintPool[j];
|
|
int swapi = btRandInt2(j+1);
|
|
m_orderTmpConstraintPool[j] = m_orderTmpConstraintPool[swapi];
|
|
m_orderTmpConstraintPool[swapi] = tmp;
|
|
}
|
|
|
|
for (int j=0; j<numFrictionPool; ++j) {
|
|
int tmp = m_orderFrictionConstraintPool[j];
|
|
int swapi = btRandInt2(j+1);
|
|
m_orderFrictionConstraintPool[j] = m_orderFrictionConstraintPool[swapi];
|
|
m_orderFrictionConstraintPool[swapi] = tmp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
///solve all joint constraints
|
|
for (int j=0;j<m_tmpSolverNonContactConstraintPool.size();j++)
|
|
{
|
|
btSolverConstraint& constraint = m_tmpSolverNonContactConstraintPool[m_orderNonContactConstraintPool[j]];
|
|
if (iteration < constraint.m_overrideNumSolverIterations)
|
|
{
|
|
btScalar residual = resolveSingleConstraintRowGeneric(m_tmpSolverBodyPool[constraint.m_solverBodyIdA],m_tmpSolverBodyPool[constraint.m_solverBodyIdB],constraint);
|
|
leastSquaresResidual = btMax(leastSquaresResidual, residual*residual);
|
|
}
|
|
}
|
|
|
|
if (iteration< infoGlobal.m_numIterations)
|
|
{
|
|
for (int j=0;j<numConstraints;j++)
|
|
{
|
|
if (constraints[j]->isEnabled())
|
|
{
|
|
int bodyAid = getOrInitSolverBody(constraints[j]->getRigidBodyA(),infoGlobal.m_timeStep);
|
|
int bodyBid = getOrInitSolverBody(constraints[j]->getRigidBodyB(),infoGlobal.m_timeStep);
|
|
btSolverBody& bodyA = m_tmpSolverBodyPool[bodyAid];
|
|
btSolverBody& bodyB = m_tmpSolverBodyPool[bodyBid];
|
|
constraints[j]->solveConstraintObsolete(bodyA,bodyB,infoGlobal.m_timeStep);
|
|
}
|
|
}
|
|
|
|
///solve all contact constraints
|
|
if (infoGlobal.m_solverMode & SOLVER_INTERLEAVE_CONTACT_AND_FRICTION_CONSTRAINTS)
|
|
{
|
|
int numPoolConstraints = m_tmpSolverContactConstraintPool.size();
|
|
int multiplier = (infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS)? 2 : 1;
|
|
|
|
for (int c=0;c<numPoolConstraints;c++)
|
|
{
|
|
btScalar totalImpulse =0;
|
|
|
|
{
|
|
const btSolverConstraint& solveManifold = m_tmpSolverContactConstraintPool[m_orderTmpConstraintPool[c]];
|
|
btScalar residual = resolveSingleConstraintRowLowerLimit(m_tmpSolverBodyPool[solveManifold.m_solverBodyIdA],m_tmpSolverBodyPool[solveManifold.m_solverBodyIdB],solveManifold);
|
|
leastSquaresResidual = btMax(leastSquaresResidual, residual*residual);
|
|
|
|
totalImpulse = solveManifold.m_appliedImpulse;
|
|
}
|
|
bool applyFriction = true;
|
|
if (applyFriction)
|
|
{
|
|
{
|
|
|
|
btSolverConstraint& solveManifold = m_tmpSolverContactFrictionConstraintPool[m_orderFrictionConstraintPool[c*multiplier]];
|
|
|
|
if (totalImpulse>btScalar(0))
|
|
{
|
|
solveManifold.m_lowerLimit = -(solveManifold.m_friction*totalImpulse);
|
|
solveManifold.m_upperLimit = solveManifold.m_friction*totalImpulse;
|
|
|
|
btScalar residual = resolveSingleConstraintRowGeneric(m_tmpSolverBodyPool[solveManifold.m_solverBodyIdA],m_tmpSolverBodyPool[solveManifold.m_solverBodyIdB],solveManifold);
|
|
leastSquaresResidual = btMax(leastSquaresResidual, residual*residual);
|
|
}
|
|
}
|
|
|
|
if (infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS)
|
|
{
|
|
|
|
btSolverConstraint& solveManifold = m_tmpSolverContactFrictionConstraintPool[m_orderFrictionConstraintPool[c*multiplier+1]];
|
|
|
|
if (totalImpulse>btScalar(0))
|
|
{
|
|
solveManifold.m_lowerLimit = -(solveManifold.m_friction*totalImpulse);
|
|
solveManifold.m_upperLimit = solveManifold.m_friction*totalImpulse;
|
|
|
|
btScalar residual = resolveSingleConstraintRowGeneric(m_tmpSolverBodyPool[solveManifold.m_solverBodyIdA],m_tmpSolverBodyPool[solveManifold.m_solverBodyIdB],solveManifold);
|
|
leastSquaresResidual = btMax(leastSquaresResidual, residual*residual);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
else//SOLVER_INTERLEAVE_CONTACT_AND_FRICTION_CONSTRAINTS
|
|
{
|
|
//solve the friction constraints after all contact constraints, don't interleave them
|
|
int numPoolConstraints = m_tmpSolverContactConstraintPool.size();
|
|
int j;
|
|
|
|
for (j=0;j<numPoolConstraints;j++)
|
|
{
|
|
const btSolverConstraint& solveManifold = m_tmpSolverContactConstraintPool[m_orderTmpConstraintPool[j]];
|
|
btScalar residual = resolveSingleConstraintRowLowerLimit(m_tmpSolverBodyPool[solveManifold.m_solverBodyIdA],m_tmpSolverBodyPool[solveManifold.m_solverBodyIdB],solveManifold);
|
|
leastSquaresResidual = btMax(leastSquaresResidual, residual*residual);
|
|
}
|
|
|
|
|
|
|
|
///solve all friction constraints
|
|
|
|
int numFrictionPoolConstraints = m_tmpSolverContactFrictionConstraintPool.size();
|
|
for (j=0;j<numFrictionPoolConstraints;j++)
|
|
{
|
|
btSolverConstraint& solveManifold = m_tmpSolverContactFrictionConstraintPool[m_orderFrictionConstraintPool[j]];
|
|
btScalar totalImpulse = m_tmpSolverContactConstraintPool[solveManifold.m_frictionIndex].m_appliedImpulse;
|
|
|
|
if (totalImpulse>btScalar(0))
|
|
{
|
|
solveManifold.m_lowerLimit = -(solveManifold.m_friction*totalImpulse);
|
|
solveManifold.m_upperLimit = solveManifold.m_friction*totalImpulse;
|
|
|
|
btScalar residual = resolveSingleConstraintRowGeneric(m_tmpSolverBodyPool[solveManifold.m_solverBodyIdA],m_tmpSolverBodyPool[solveManifold.m_solverBodyIdB],solveManifold);
|
|
leastSquaresResidual = btMax(leastSquaresResidual, residual*residual);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
int numRollingFrictionPoolConstraints = m_tmpSolverContactRollingFrictionConstraintPool.size();
|
|
for (int j=0;j<numRollingFrictionPoolConstraints;j++)
|
|
{
|
|
|
|
btSolverConstraint& rollingFrictionConstraint = m_tmpSolverContactRollingFrictionConstraintPool[j];
|
|
btScalar totalImpulse = m_tmpSolverContactConstraintPool[rollingFrictionConstraint.m_frictionIndex].m_appliedImpulse;
|
|
if (totalImpulse>btScalar(0))
|
|
{
|
|
btScalar rollingFrictionMagnitude = rollingFrictionConstraint.m_friction*totalImpulse;
|
|
if (rollingFrictionMagnitude>rollingFrictionConstraint.m_friction)
|
|
rollingFrictionMagnitude = rollingFrictionConstraint.m_friction;
|
|
|
|
rollingFrictionConstraint.m_lowerLimit = -rollingFrictionMagnitude;
|
|
rollingFrictionConstraint.m_upperLimit = rollingFrictionMagnitude;
|
|
|
|
btScalar residual = resolveSingleConstraintRowGeneric(m_tmpSolverBodyPool[rollingFrictionConstraint.m_solverBodyIdA],m_tmpSolverBodyPool[rollingFrictionConstraint.m_solverBodyIdB],rollingFrictionConstraint);
|
|
leastSquaresResidual = btMax(leastSquaresResidual, residual*residual);
|
|
}
|
|
}
|
|
|
|
|
|
}
|
|
return leastSquaresResidual;
|
|
}
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::solveGroupCacheFriendlySplitImpulseIterations(btCollisionObject** bodies,int numBodies,btPersistentManifold** manifoldPtr, int numManifolds,btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& infoGlobal,btIDebugDraw* debugDrawer)
|
|
{
|
|
BT_PROFILE("solveGroupCacheFriendlySplitImpulseIterations");
|
|
int iteration;
|
|
if (infoGlobal.m_splitImpulse)
|
|
{
|
|
{
|
|
for ( iteration = 0;iteration<infoGlobal.m_numIterations;iteration++)
|
|
{
|
|
btScalar leastSquaresResidual =0.f;
|
|
{
|
|
int numPoolConstraints = m_tmpSolverContactConstraintPool.size();
|
|
int j;
|
|
for (j=0;j<numPoolConstraints;j++)
|
|
{
|
|
const btSolverConstraint& solveManifold = m_tmpSolverContactConstraintPool[m_orderTmpConstraintPool[j]];
|
|
|
|
btScalar residual = resolveSplitPenetrationImpulse(m_tmpSolverBodyPool[solveManifold.m_solverBodyIdA],m_tmpSolverBodyPool[solveManifold.m_solverBodyIdB],solveManifold);
|
|
leastSquaresResidual = btMax(leastSquaresResidual, residual*residual);
|
|
}
|
|
}
|
|
if (leastSquaresResidual <= infoGlobal.m_leastSquaresResidualThreshold || iteration>=(infoGlobal.m_numIterations-1))
|
|
{
|
|
#ifdef VERBOSE_RESIDUAL_PRINTF
|
|
printf("residual = %f at iteration #%d\n",leastSquaresResidual,iteration);
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
btScalar btSequentialImpulseConstraintSolver::solveGroupCacheFriendlyIterations(btCollisionObject** bodies ,int numBodies,btPersistentManifold** manifoldPtr, int numManifolds,btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& infoGlobal,btIDebugDraw* debugDrawer)
|
|
{
|
|
BT_PROFILE("solveGroupCacheFriendlyIterations");
|
|
|
|
{
|
|
///this is a special step to resolve penetrations (just for contacts)
|
|
solveGroupCacheFriendlySplitImpulseIterations(bodies ,numBodies,manifoldPtr, numManifolds,constraints,numConstraints,infoGlobal,debugDrawer);
|
|
|
|
int maxIterations = m_maxOverrideNumSolverIterations > infoGlobal.m_numIterations? m_maxOverrideNumSolverIterations : infoGlobal.m_numIterations;
|
|
|
|
for ( int iteration = 0 ; iteration< maxIterations ; iteration++)
|
|
//for ( int iteration = maxIterations-1 ; iteration >= 0;iteration--)
|
|
{
|
|
m_leastSquaresResidual = solveSingleIteration(iteration, bodies ,numBodies,manifoldPtr, numManifolds,constraints,numConstraints,infoGlobal,debugDrawer);
|
|
|
|
if (m_leastSquaresResidual <= infoGlobal.m_leastSquaresResidualThreshold || (iteration>= (maxIterations-1)))
|
|
{
|
|
#ifdef VERBOSE_RESIDUAL_PRINTF
|
|
printf("residual = %f at iteration #%d\n",m_leastSquaresResidual,iteration);
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
}
|
|
return 0.f;
|
|
}
|
|
|
|
void btSequentialImpulseConstraintSolver::writeBackContacts(int iBegin, int iEnd, const btContactSolverInfo& infoGlobal)
|
|
{
|
|
for (int j=iBegin; j<iEnd; j++)
|
|
{
|
|
const btSolverConstraint& solveManifold = m_tmpSolverContactConstraintPool[j];
|
|
btManifoldPoint* pt = (btManifoldPoint*) solveManifold.m_originalContactPoint;
|
|
btAssert(pt);
|
|
pt->m_appliedImpulse = solveManifold.m_appliedImpulse;
|
|
// float f = m_tmpSolverContactFrictionConstraintPool[solveManifold.m_frictionIndex].m_appliedImpulse;
|
|
// printf("pt->m_appliedImpulseLateral1 = %f\n", f);
|
|
pt->m_appliedImpulseLateral1 = m_tmpSolverContactFrictionConstraintPool[solveManifold.m_frictionIndex].m_appliedImpulse;
|
|
//printf("pt->m_appliedImpulseLateral1 = %f\n", pt->m_appliedImpulseLateral1);
|
|
if ((infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS))
|
|
{
|
|
pt->m_appliedImpulseLateral2 = m_tmpSolverContactFrictionConstraintPool[solveManifold.m_frictionIndex+1].m_appliedImpulse;
|
|
}
|
|
//do a callback here?
|
|
}
|
|
}
|
|
|
|
void btSequentialImpulseConstraintSolver::writeBackJoints(int iBegin, int iEnd, const btContactSolverInfo& infoGlobal)
|
|
{
|
|
for (int j=iBegin; j<iEnd; j++)
|
|
{
|
|
const btSolverConstraint& solverConstr = m_tmpSolverNonContactConstraintPool[j];
|
|
btTypedConstraint* constr = (btTypedConstraint*)solverConstr.m_originalContactPoint;
|
|
btJointFeedback* fb = constr->getJointFeedback();
|
|
if (fb)
|
|
{
|
|
fb->m_appliedForceBodyA += solverConstr.m_contactNormal1*solverConstr.m_appliedImpulse*constr->getRigidBodyA().getLinearFactor()/infoGlobal.m_timeStep;
|
|
fb->m_appliedForceBodyB += solverConstr.m_contactNormal2*solverConstr.m_appliedImpulse*constr->getRigidBodyB().getLinearFactor()/infoGlobal.m_timeStep;
|
|
fb->m_appliedTorqueBodyA += solverConstr.m_relpos1CrossNormal* constr->getRigidBodyA().getAngularFactor()*solverConstr.m_appliedImpulse/infoGlobal.m_timeStep;
|
|
fb->m_appliedTorqueBodyB += solverConstr.m_relpos2CrossNormal* constr->getRigidBodyB().getAngularFactor()*solverConstr.m_appliedImpulse/infoGlobal.m_timeStep; /*RGM ???? */
|
|
|
|
}
|
|
|
|
constr->internalSetAppliedImpulse(solverConstr.m_appliedImpulse);
|
|
if (btFabs(solverConstr.m_appliedImpulse)>=constr->getBreakingImpulseThreshold())
|
|
{
|
|
constr->setEnabled(false);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void btSequentialImpulseConstraintSolver::writeBackBodies(int iBegin, int iEnd, const btContactSolverInfo& infoGlobal)
|
|
{
|
|
for (int i=iBegin; i<iEnd; i++)
|
|
{
|
|
btRigidBody* body = m_tmpSolverBodyPool[i].m_originalBody;
|
|
if (body)
|
|
{
|
|
if (infoGlobal.m_splitImpulse)
|
|
m_tmpSolverBodyPool[i].writebackVelocityAndTransform(infoGlobal.m_timeStep, infoGlobal.m_splitImpulseTurnErp);
|
|
else
|
|
m_tmpSolverBodyPool[i].writebackVelocity();
|
|
|
|
m_tmpSolverBodyPool[i].m_originalBody->setLinearVelocity(
|
|
m_tmpSolverBodyPool[i].m_linearVelocity+
|
|
m_tmpSolverBodyPool[i].m_externalForceImpulse);
|
|
|
|
m_tmpSolverBodyPool[i].m_originalBody->setAngularVelocity(
|
|
m_tmpSolverBodyPool[i].m_angularVelocity+
|
|
m_tmpSolverBodyPool[i].m_externalTorqueImpulse);
|
|
|
|
if (infoGlobal.m_splitImpulse)
|
|
m_tmpSolverBodyPool[i].m_originalBody->setWorldTransform(m_tmpSolverBodyPool[i].m_worldTransform);
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|
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|
m_tmpSolverBodyPool[i].m_originalBody->setCompanionId(-1);
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|
}
|
|
}
|
|
}
|
|
|
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btScalar btSequentialImpulseConstraintSolver::solveGroupCacheFriendlyFinish(btCollisionObject** bodies,int numBodies,const btContactSolverInfo& infoGlobal)
|
|
{
|
|
BT_PROFILE("solveGroupCacheFriendlyFinish");
|
|
|
|
if (infoGlobal.m_solverMode & SOLVER_USE_WARMSTARTING)
|
|
{
|
|
writeBackContacts(0, m_tmpSolverContactConstraintPool.size(), infoGlobal);
|
|
}
|
|
|
|
writeBackJoints(0, m_tmpSolverNonContactConstraintPool.size(), infoGlobal);
|
|
writeBackBodies(0, m_tmpSolverBodyPool.size(), infoGlobal);
|
|
|
|
m_tmpSolverContactConstraintPool.resizeNoInitialize(0);
|
|
m_tmpSolverNonContactConstraintPool.resizeNoInitialize(0);
|
|
m_tmpSolverContactFrictionConstraintPool.resizeNoInitialize(0);
|
|
m_tmpSolverContactRollingFrictionConstraintPool.resizeNoInitialize(0);
|
|
|
|
m_tmpSolverBodyPool.resizeNoInitialize(0);
|
|
return 0.f;
|
|
}
|
|
|
|
|
|
|
|
/// btSequentialImpulseConstraintSolver Sequentially applies impulses
|
|
btScalar btSequentialImpulseConstraintSolver::solveGroup(btCollisionObject** bodies,int numBodies,btPersistentManifold** manifoldPtr, int numManifolds,btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& infoGlobal,btIDebugDraw* debugDrawer,btDispatcher* /*dispatcher*/)
|
|
{
|
|
|
|
BT_PROFILE("solveGroup");
|
|
//you need to provide at least some bodies
|
|
|
|
solveGroupCacheFriendlySetup( bodies, numBodies, manifoldPtr, numManifolds,constraints, numConstraints,infoGlobal,debugDrawer);
|
|
|
|
solveGroupCacheFriendlyIterations(bodies, numBodies, manifoldPtr, numManifolds,constraints, numConstraints,infoGlobal,debugDrawer);
|
|
|
|
solveGroupCacheFriendlyFinish(bodies, numBodies, infoGlobal);
|
|
|
|
return 0.f;
|
|
}
|
|
|
|
void btSequentialImpulseConstraintSolver::reset()
|
|
{
|
|
m_btSeed2 = 0;
|
|
}
|