640 lines
20 KiB
C++
640 lines
20 KiB
C++
/*
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Bullet Continuous Collision Detection and Physics Library
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Copyright (c) 2003-2013 Erwin Coumans http://bulletphysics.org
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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///original version written by Erwin Coumans, October 2013
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#include "btMLCPSolver.h"
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#include "LinearMath/btMatrixX.h"
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#include "LinearMath/btQuickprof.h"
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#include "btSolveProjectedGaussSeidel.h"
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btMLCPSolver::btMLCPSolver( btMLCPSolverInterface* solver)
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:m_solver(solver),
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m_fallback(0)
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{
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}
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btMLCPSolver::~btMLCPSolver()
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{
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}
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bool gUseMatrixMultiply = false;
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bool interleaveContactAndFriction = false;
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btScalar btMLCPSolver::solveGroupCacheFriendlySetup(btCollisionObject** bodies, int numBodiesUnUsed, btPersistentManifold** manifoldPtr, int numManifolds,btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& infoGlobal,btIDebugDraw* debugDrawer)
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{
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btSequentialImpulseConstraintSolver::solveGroupCacheFriendlySetup( bodies, numBodiesUnUsed, manifoldPtr, numManifolds,constraints,numConstraints,infoGlobal,debugDrawer);
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{
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BT_PROFILE("gather constraint data");
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int numFrictionPerContact = m_tmpSolverContactConstraintPool.size()==m_tmpSolverContactFrictionConstraintPool.size()? 1 : 2;
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// int numBodies = m_tmpSolverBodyPool.size();
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m_allConstraintPtrArray.resize(0);
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m_limitDependencies.resize(m_tmpSolverNonContactConstraintPool.size()+m_tmpSolverContactConstraintPool.size()+m_tmpSolverContactFrictionConstraintPool.size());
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btAssert(m_limitDependencies.size() == m_tmpSolverNonContactConstraintPool.size()+m_tmpSolverContactConstraintPool.size()+m_tmpSolverContactFrictionConstraintPool.size());
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// printf("m_limitDependencies.size() = %d\n",m_limitDependencies.size());
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int dindex = 0;
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for (int i=0;i<m_tmpSolverNonContactConstraintPool.size();i++)
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{
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m_allConstraintPtrArray.push_back(&m_tmpSolverNonContactConstraintPool[i]);
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m_limitDependencies[dindex++] = -1;
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}
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///The btSequentialImpulseConstraintSolver moves all friction constraints at the very end, we can also interleave them instead
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int firstContactConstraintOffset=dindex;
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if (interleaveContactAndFriction)
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{
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for (int i=0;i<m_tmpSolverContactConstraintPool.size();i++)
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{
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m_allConstraintPtrArray.push_back(&m_tmpSolverContactConstraintPool[i]);
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m_limitDependencies[dindex++] = -1;
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m_allConstraintPtrArray.push_back(&m_tmpSolverContactFrictionConstraintPool[i*numFrictionPerContact]);
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int findex = (m_tmpSolverContactFrictionConstraintPool[i*numFrictionPerContact].m_frictionIndex*(1+numFrictionPerContact));
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m_limitDependencies[dindex++] = findex +firstContactConstraintOffset;
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if (numFrictionPerContact==2)
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{
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m_allConstraintPtrArray.push_back(&m_tmpSolverContactFrictionConstraintPool[i*numFrictionPerContact+1]);
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m_limitDependencies[dindex++] = findex+firstContactConstraintOffset;
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}
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}
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} else
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{
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for (int i=0;i<m_tmpSolverContactConstraintPool.size();i++)
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{
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m_allConstraintPtrArray.push_back(&m_tmpSolverContactConstraintPool[i]);
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m_limitDependencies[dindex++] = -1;
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}
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for (int i=0;i<m_tmpSolverContactFrictionConstraintPool.size();i++)
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{
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m_allConstraintPtrArray.push_back(&m_tmpSolverContactFrictionConstraintPool[i]);
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m_limitDependencies[dindex++] = m_tmpSolverContactFrictionConstraintPool[i].m_frictionIndex+firstContactConstraintOffset;
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}
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}
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if (!m_allConstraintPtrArray.size())
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{
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m_A.resize(0,0);
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m_b.resize(0);
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m_x.resize(0);
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m_lo.resize(0);
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m_hi.resize(0);
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return 0.f;
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}
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}
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if (gUseMatrixMultiply)
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{
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BT_PROFILE("createMLCP");
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createMLCP(infoGlobal);
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}
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else
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{
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BT_PROFILE("createMLCPFast");
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createMLCPFast(infoGlobal);
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}
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return 0.f;
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}
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bool btMLCPSolver::solveMLCP(const btContactSolverInfo& infoGlobal)
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{
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bool result = true;
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if (m_A.rows()==0)
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return true;
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//if using split impulse, we solve 2 separate (M)LCPs
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if (infoGlobal.m_splitImpulse)
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{
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btMatrixXu Acopy = m_A;
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btAlignedObjectArray<int> limitDependenciesCopy = m_limitDependencies;
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// printf("solve first LCP\n");
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result = m_solver->solveMLCP(m_A, m_b, m_x, m_lo,m_hi, m_limitDependencies,infoGlobal.m_numIterations );
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if (result)
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result = m_solver->solveMLCP(Acopy, m_bSplit, m_xSplit, m_lo,m_hi, limitDependenciesCopy,infoGlobal.m_numIterations );
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} else
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{
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result = m_solver->solveMLCP(m_A, m_b, m_x, m_lo,m_hi, m_limitDependencies,infoGlobal.m_numIterations );
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}
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return result;
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}
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struct btJointNode
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{
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int jointIndex; // pointer to enclosing dxJoint object
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int otherBodyIndex; // *other* body this joint is connected to
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int nextJointNodeIndex;//-1 for null
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int constraintRowIndex;
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};
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void btMLCPSolver::createMLCPFast(const btContactSolverInfo& infoGlobal)
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{
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int numContactRows = interleaveContactAndFriction ? 3 : 1;
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int numConstraintRows = m_allConstraintPtrArray.size();
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int n = numConstraintRows;
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{
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BT_PROFILE("init b (rhs)");
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m_b.resize(numConstraintRows);
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m_bSplit.resize(numConstraintRows);
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m_b.setZero();
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m_bSplit.setZero();
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for (int i=0;i<numConstraintRows ;i++)
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{
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btScalar jacDiag = m_allConstraintPtrArray[i]->m_jacDiagABInv;
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if (!btFuzzyZero(jacDiag))
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{
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btScalar rhs = m_allConstraintPtrArray[i]->m_rhs;
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btScalar rhsPenetration = m_allConstraintPtrArray[i]->m_rhsPenetration;
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m_b[i]=rhs/jacDiag;
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m_bSplit[i] = rhsPenetration/jacDiag;
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}
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}
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}
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// btScalar* w = 0;
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// int nub = 0;
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m_lo.resize(numConstraintRows);
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m_hi.resize(numConstraintRows);
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{
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BT_PROFILE("init lo/ho");
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for (int i=0;i<numConstraintRows;i++)
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{
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if (0)//m_limitDependencies[i]>=0)
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{
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m_lo[i] = -BT_INFINITY;
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m_hi[i] = BT_INFINITY;
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} else
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{
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m_lo[i] = m_allConstraintPtrArray[i]->m_lowerLimit;
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m_hi[i] = m_allConstraintPtrArray[i]->m_upperLimit;
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}
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}
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}
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//
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int m=m_allConstraintPtrArray.size();
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int numBodies = m_tmpSolverBodyPool.size();
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btAlignedObjectArray<int> bodyJointNodeArray;
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{
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BT_PROFILE("bodyJointNodeArray.resize");
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bodyJointNodeArray.resize(numBodies,-1);
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}
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btAlignedObjectArray<btJointNode> jointNodeArray;
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{
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BT_PROFILE("jointNodeArray.reserve");
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jointNodeArray.reserve(2*m_allConstraintPtrArray.size());
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}
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btMatrixXu& J3 = m_scratchJ3;
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{
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BT_PROFILE("J3.resize");
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J3.resize(2*m,8);
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}
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btMatrixXu& JinvM3 = m_scratchJInvM3;
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{
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BT_PROFILE("JinvM3.resize/setZero");
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JinvM3.resize(2*m,8);
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JinvM3.setZero();
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J3.setZero();
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}
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int cur=0;
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int rowOffset = 0;
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btAlignedObjectArray<int>& ofs = m_scratchOfs;
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{
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BT_PROFILE("ofs resize");
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ofs.resize(0);
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ofs.resizeNoInitialize(m_allConstraintPtrArray.size());
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}
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{
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BT_PROFILE("Compute J and JinvM");
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int c=0;
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int numRows = 0;
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for (int i=0;i<m_allConstraintPtrArray.size();i+=numRows,c++)
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{
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ofs[c] = rowOffset;
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int sbA = m_allConstraintPtrArray[i]->m_solverBodyIdA;
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int sbB = m_allConstraintPtrArray[i]->m_solverBodyIdB;
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btRigidBody* orgBodyA = m_tmpSolverBodyPool[sbA].m_originalBody;
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btRigidBody* orgBodyB = m_tmpSolverBodyPool[sbB].m_originalBody;
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numRows = i<m_tmpSolverNonContactConstraintPool.size() ? m_tmpConstraintSizesPool[c].m_numConstraintRows : numContactRows ;
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if (orgBodyA)
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{
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{
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int slotA=-1;
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//find free jointNode slot for sbA
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slotA =jointNodeArray.size();
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jointNodeArray.expand();//NonInitializing();
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int prevSlot = bodyJointNodeArray[sbA];
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bodyJointNodeArray[sbA] = slotA;
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jointNodeArray[slotA].nextJointNodeIndex = prevSlot;
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jointNodeArray[slotA].jointIndex = c;
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jointNodeArray[slotA].constraintRowIndex = i;
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jointNodeArray[slotA].otherBodyIndex = orgBodyB ? sbB : -1;
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}
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for (int row=0;row<numRows;row++,cur++)
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{
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btVector3 normalInvMass = m_allConstraintPtrArray[i+row]->m_contactNormal1 * orgBodyA->getInvMass();
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btVector3 relPosCrossNormalInvInertia = m_allConstraintPtrArray[i+row]->m_relpos1CrossNormal * orgBodyA->getInvInertiaTensorWorld();
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for (int r=0;r<3;r++)
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{
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J3.setElem(cur,r,m_allConstraintPtrArray[i+row]->m_contactNormal1[r]);
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J3.setElem(cur,r+4,m_allConstraintPtrArray[i+row]->m_relpos1CrossNormal[r]);
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JinvM3.setElem(cur,r,normalInvMass[r]);
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JinvM3.setElem(cur,r+4,relPosCrossNormalInvInertia[r]);
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}
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J3.setElem(cur,3,0);
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JinvM3.setElem(cur,3,0);
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J3.setElem(cur,7,0);
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JinvM3.setElem(cur,7,0);
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}
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} else
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{
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cur += numRows;
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}
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if (orgBodyB)
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{
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{
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int slotB=-1;
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//find free jointNode slot for sbA
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slotB =jointNodeArray.size();
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jointNodeArray.expand();//NonInitializing();
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int prevSlot = bodyJointNodeArray[sbB];
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bodyJointNodeArray[sbB] = slotB;
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jointNodeArray[slotB].nextJointNodeIndex = prevSlot;
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jointNodeArray[slotB].jointIndex = c;
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jointNodeArray[slotB].otherBodyIndex = orgBodyA ? sbA : -1;
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jointNodeArray[slotB].constraintRowIndex = i;
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}
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for (int row=0;row<numRows;row++,cur++)
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{
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btVector3 normalInvMassB = m_allConstraintPtrArray[i+row]->m_contactNormal2*orgBodyB->getInvMass();
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btVector3 relPosInvInertiaB = m_allConstraintPtrArray[i+row]->m_relpos2CrossNormal * orgBodyB->getInvInertiaTensorWorld();
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for (int r=0;r<3;r++)
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{
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J3.setElem(cur,r,m_allConstraintPtrArray[i+row]->m_contactNormal2[r]);
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J3.setElem(cur,r+4,m_allConstraintPtrArray[i+row]->m_relpos2CrossNormal[r]);
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JinvM3.setElem(cur,r,normalInvMassB[r]);
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JinvM3.setElem(cur,r+4,relPosInvInertiaB[r]);
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}
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J3.setElem(cur,3,0);
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JinvM3.setElem(cur,3,0);
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J3.setElem(cur,7,0);
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JinvM3.setElem(cur,7,0);
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}
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}
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else
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{
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cur += numRows;
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}
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rowOffset+=numRows;
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}
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}
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//compute JinvM = J*invM.
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const btScalar* JinvM = JinvM3.getBufferPointer();
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const btScalar* Jptr = J3.getBufferPointer();
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{
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BT_PROFILE("m_A.resize");
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m_A.resize(n,n);
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}
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{
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BT_PROFILE("m_A.setZero");
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m_A.setZero();
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}
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int c=0;
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{
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int numRows = 0;
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BT_PROFILE("Compute A");
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for (int i=0;i<m_allConstraintPtrArray.size();i+= numRows,c++)
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{
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int row__ = ofs[c];
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int sbA = m_allConstraintPtrArray[i]->m_solverBodyIdA;
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int sbB = m_allConstraintPtrArray[i]->m_solverBodyIdB;
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// btRigidBody* orgBodyA = m_tmpSolverBodyPool[sbA].m_originalBody;
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// btRigidBody* orgBodyB = m_tmpSolverBodyPool[sbB].m_originalBody;
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numRows = i<m_tmpSolverNonContactConstraintPool.size() ? m_tmpConstraintSizesPool[c].m_numConstraintRows : numContactRows ;
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const btScalar *JinvMrow = JinvM + 2*8*(size_t)row__;
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{
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int startJointNodeA = bodyJointNodeArray[sbA];
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while (startJointNodeA>=0)
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{
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int j0 = jointNodeArray[startJointNodeA].jointIndex;
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int cr0 = jointNodeArray[startJointNodeA].constraintRowIndex;
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if (j0<c)
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{
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int numRowsOther = cr0 < m_tmpSolverNonContactConstraintPool.size() ? m_tmpConstraintSizesPool[j0].m_numConstraintRows : numContactRows;
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size_t ofsother = (m_allConstraintPtrArray[cr0]->m_solverBodyIdB == sbA) ? 8*numRowsOther : 0;
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//printf("%d joint i %d and j0: %d: ",count++,i,j0);
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m_A.multiplyAdd2_p8r ( JinvMrow,
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Jptr + 2*8*(size_t)ofs[j0] + ofsother, numRows, numRowsOther, row__,ofs[j0]);
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}
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startJointNodeA = jointNodeArray[startJointNodeA].nextJointNodeIndex;
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}
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}
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{
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int startJointNodeB = bodyJointNodeArray[sbB];
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while (startJointNodeB>=0)
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{
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int j1 = jointNodeArray[startJointNodeB].jointIndex;
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int cj1 = jointNodeArray[startJointNodeB].constraintRowIndex;
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if (j1<c)
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{
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int numRowsOther = cj1 < m_tmpSolverNonContactConstraintPool.size() ? m_tmpConstraintSizesPool[j1].m_numConstraintRows : numContactRows;
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size_t ofsother = (m_allConstraintPtrArray[cj1]->m_solverBodyIdB == sbB) ? 8*numRowsOther : 0;
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m_A.multiplyAdd2_p8r ( JinvMrow + 8*(size_t)numRows,
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Jptr + 2*8*(size_t)ofs[j1] + ofsother, numRows, numRowsOther, row__,ofs[j1]);
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}
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startJointNodeB = jointNodeArray[startJointNodeB].nextJointNodeIndex;
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}
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}
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}
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{
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BT_PROFILE("compute diagonal");
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// compute diagonal blocks of m_A
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int row__ = 0;
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int numJointRows = m_allConstraintPtrArray.size();
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int jj=0;
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for (;row__<numJointRows;)
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{
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//int sbA = m_allConstraintPtrArray[row__]->m_solverBodyIdA;
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int sbB = m_allConstraintPtrArray[row__]->m_solverBodyIdB;
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// btRigidBody* orgBodyA = m_tmpSolverBodyPool[sbA].m_originalBody;
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btRigidBody* orgBodyB = m_tmpSolverBodyPool[sbB].m_originalBody;
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const unsigned int infom = row__ < m_tmpSolverNonContactConstraintPool.size() ? m_tmpConstraintSizesPool[jj].m_numConstraintRows : numContactRows;
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const btScalar *JinvMrow = JinvM + 2*8*(size_t)row__;
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const btScalar *Jrow = Jptr + 2*8*(size_t)row__;
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m_A.multiply2_p8r (JinvMrow, Jrow, infom, infom, row__,row__);
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if (orgBodyB)
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{
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m_A.multiplyAdd2_p8r (JinvMrow + 8*(size_t)infom, Jrow + 8*(size_t)infom, infom, infom, row__,row__);
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}
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row__ += infom;
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jj++;
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}
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}
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}
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if (1)
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{
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// add cfm to the diagonal of m_A
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for ( int i=0; i<m_A.rows(); ++i)
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{
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m_A.setElem(i,i,m_A(i,i)+ infoGlobal.m_globalCfm/ infoGlobal.m_timeStep);
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}
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}
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///fill the upper triangle of the matrix, to make it symmetric
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{
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BT_PROFILE("fill the upper triangle ");
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m_A.copyLowerToUpperTriangle();
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}
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{
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BT_PROFILE("resize/init x");
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m_x.resize(numConstraintRows);
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m_xSplit.resize(numConstraintRows);
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if (infoGlobal.m_solverMode&SOLVER_USE_WARMSTARTING)
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{
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for (int i=0;i<m_allConstraintPtrArray.size();i++)
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{
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const btSolverConstraint& c = *m_allConstraintPtrArray[i];
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m_x[i]=c.m_appliedImpulse;
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m_xSplit[i] = c.m_appliedPushImpulse;
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}
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} else
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{
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m_x.setZero();
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m_xSplit.setZero();
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}
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}
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}
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void btMLCPSolver::createMLCP(const btContactSolverInfo& infoGlobal)
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{
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int numBodies = this->m_tmpSolverBodyPool.size();
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int numConstraintRows = m_allConstraintPtrArray.size();
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m_b.resize(numConstraintRows);
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if (infoGlobal.m_splitImpulse)
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m_bSplit.resize(numConstraintRows);
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m_bSplit.setZero();
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m_b.setZero();
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for (int i=0;i<numConstraintRows ;i++)
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{
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if (m_allConstraintPtrArray[i]->m_jacDiagABInv)
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{
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m_b[i]=m_allConstraintPtrArray[i]->m_rhs/m_allConstraintPtrArray[i]->m_jacDiagABInv;
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if (infoGlobal.m_splitImpulse)
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m_bSplit[i] = m_allConstraintPtrArray[i]->m_rhsPenetration/m_allConstraintPtrArray[i]->m_jacDiagABInv;
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}
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}
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btMatrixXu& Minv = m_scratchMInv;
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Minv.resize(6*numBodies,6*numBodies);
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Minv.setZero();
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for (int i=0;i<numBodies;i++)
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{
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const btSolverBody& rb = m_tmpSolverBodyPool[i];
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const btVector3& invMass = rb.m_invMass;
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setElem(Minv,i*6+0,i*6+0,invMass[0]);
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setElem(Minv,i*6+1,i*6+1,invMass[1]);
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setElem(Minv,i*6+2,i*6+2,invMass[2]);
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btRigidBody* orgBody = m_tmpSolverBodyPool[i].m_originalBody;
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for (int r=0;r<3;r++)
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for (int c=0;c<3;c++)
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setElem(Minv,i*6+3+r,i*6+3+c,orgBody? orgBody->getInvInertiaTensorWorld()[r][c] : 0);
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}
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btMatrixXu& J = m_scratchJ;
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J.resize(numConstraintRows,6*numBodies);
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J.setZero();
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m_lo.resize(numConstraintRows);
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m_hi.resize(numConstraintRows);
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for (int i=0;i<numConstraintRows;i++)
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{
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m_lo[i] = m_allConstraintPtrArray[i]->m_lowerLimit;
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m_hi[i] = m_allConstraintPtrArray[i]->m_upperLimit;
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int bodyIndex0 = m_allConstraintPtrArray[i]->m_solverBodyIdA;
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int bodyIndex1 = m_allConstraintPtrArray[i]->m_solverBodyIdB;
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if (m_tmpSolverBodyPool[bodyIndex0].m_originalBody)
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{
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setElem(J,i,6*bodyIndex0+0,m_allConstraintPtrArray[i]->m_contactNormal1[0]);
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setElem(J,i,6*bodyIndex0+1,m_allConstraintPtrArray[i]->m_contactNormal1[1]);
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setElem(J,i,6*bodyIndex0+2,m_allConstraintPtrArray[i]->m_contactNormal1[2]);
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setElem(J,i,6*bodyIndex0+3,m_allConstraintPtrArray[i]->m_relpos1CrossNormal[0]);
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setElem(J,i,6*bodyIndex0+4,m_allConstraintPtrArray[i]->m_relpos1CrossNormal[1]);
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setElem(J,i,6*bodyIndex0+5,m_allConstraintPtrArray[i]->m_relpos1CrossNormal[2]);
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}
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if (m_tmpSolverBodyPool[bodyIndex1].m_originalBody)
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{
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setElem(J,i,6*bodyIndex1+0,m_allConstraintPtrArray[i]->m_contactNormal2[0]);
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setElem(J,i,6*bodyIndex1+1,m_allConstraintPtrArray[i]->m_contactNormal2[1]);
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setElem(J,i,6*bodyIndex1+2,m_allConstraintPtrArray[i]->m_contactNormal2[2]);
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setElem(J,i,6*bodyIndex1+3,m_allConstraintPtrArray[i]->m_relpos2CrossNormal[0]);
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setElem(J,i,6*bodyIndex1+4,m_allConstraintPtrArray[i]->m_relpos2CrossNormal[1]);
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setElem(J,i,6*bodyIndex1+5,m_allConstraintPtrArray[i]->m_relpos2CrossNormal[2]);
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}
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}
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btMatrixXu& J_transpose = m_scratchJTranspose;
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J_transpose= J.transpose();
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btMatrixXu& tmp = m_scratchTmp;
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{
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{
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BT_PROFILE("J*Minv");
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tmp = J*Minv;
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}
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{
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BT_PROFILE("J*tmp");
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m_A = tmp*J_transpose;
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}
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}
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if (1)
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{
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// add cfm to the diagonal of m_A
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for ( int i=0; i<m_A.rows(); ++i)
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{
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m_A.setElem(i,i,m_A(i,i)+ infoGlobal.m_globalCfm / infoGlobal.m_timeStep);
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}
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}
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m_x.resize(numConstraintRows);
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if (infoGlobal.m_splitImpulse)
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m_xSplit.resize(numConstraintRows);
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// m_x.setZero();
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for (int i=0;i<m_allConstraintPtrArray.size();i++)
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{
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const btSolverConstraint& c = *m_allConstraintPtrArray[i];
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m_x[i]=c.m_appliedImpulse;
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if (infoGlobal.m_splitImpulse)
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m_xSplit[i] = c.m_appliedPushImpulse;
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}
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}
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btScalar btMLCPSolver::solveGroupCacheFriendlyIterations(btCollisionObject** bodies ,int numBodies,btPersistentManifold** manifoldPtr, int numManifolds,btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& infoGlobal,btIDebugDraw* debugDrawer)
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{
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bool result = true;
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{
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BT_PROFILE("solveMLCP");
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// printf("m_A(%d,%d)\n", m_A.rows(),m_A.cols());
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result = solveMLCP(infoGlobal);
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}
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//check if solution is valid, and otherwise fallback to btSequentialImpulseConstraintSolver::solveGroupCacheFriendlyIterations
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if (result)
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{
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BT_PROFILE("process MLCP results");
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for (int i=0;i<m_allConstraintPtrArray.size();i++)
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{
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{
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btSolverConstraint& c = *m_allConstraintPtrArray[i];
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int sbA = c.m_solverBodyIdA;
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int sbB = c.m_solverBodyIdB;
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//btRigidBody* orgBodyA = m_tmpSolverBodyPool[sbA].m_originalBody;
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// btRigidBody* orgBodyB = m_tmpSolverBodyPool[sbB].m_originalBody;
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btSolverBody& solverBodyA = m_tmpSolverBodyPool[sbA];
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btSolverBody& solverBodyB = m_tmpSolverBodyPool[sbB];
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{
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btScalar deltaImpulse = m_x[i]-c.m_appliedImpulse;
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c.m_appliedImpulse = m_x[i];
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solverBodyA.internalApplyImpulse(c.m_contactNormal1*solverBodyA.internalGetInvMass(),c.m_angularComponentA,deltaImpulse);
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solverBodyB.internalApplyImpulse(c.m_contactNormal2*solverBodyB.internalGetInvMass(),c.m_angularComponentB,deltaImpulse);
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}
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if (infoGlobal.m_splitImpulse)
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{
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btScalar deltaImpulse = m_xSplit[i] - c.m_appliedPushImpulse;
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solverBodyA.internalApplyPushImpulse(c.m_contactNormal1*solverBodyA.internalGetInvMass(),c.m_angularComponentA,deltaImpulse);
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solverBodyB.internalApplyPushImpulse(c.m_contactNormal2*solverBodyB.internalGetInvMass(),c.m_angularComponentB,deltaImpulse);
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c.m_appliedPushImpulse = m_xSplit[i];
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}
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}
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}
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}
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else
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{
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// printf("m_fallback = %d\n",m_fallback);
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m_fallback++;
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btSequentialImpulseConstraintSolver::solveGroupCacheFriendlyIterations(bodies ,numBodies,manifoldPtr, numManifolds,constraints,numConstraints,infoGlobal,debugDrawer);
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}
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return 0.f;
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}
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