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Fix Featherstone btMultiBodyPoint2Point constraint and picking: don't assume body 0 is the fixed body!

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This commit is contained in:
erwin.coumans
2013-10-22 21:06:47 +00:00
parent 75260cd0d7
commit f22ceecb82
3 changed files with 11 additions and 1 deletions
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1
src/BulletDynamics/Featherstone/btMultiBodyConstraint.h
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@@ -34,6 +34,7 @@ struct btMultiBodyJacobianData
btAlignedObjectArray<btVector3> scratch_v;
btAlignedObjectArray<btMatrix3x3> scratch_m;
btAlignedObjectArray<btSolverBody>* m_solverBodyPool;
int m_fixedBodyId;
};

2
src/BulletDynamics/Featherstone/btMultiBodyConstraintSolver.cpp
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@@ -765,6 +765,8 @@ void btMultiBodyConstraintSolver::convertContacts(btPersistentManifold** manifol
{
btMultiBodyConstraint* c = m_tmpMultiBodyConstraints[i];
m_data.m_solverBodyPool = &m_tmpSolverBodyPool;
m_data.m_fixedBodyId = m_fixedBodyId;
c->createConstraintRows(m_multiBodyNonContactConstraints,m_data, infoGlobal);
}

9
src/BulletDynamics/Featherstone/btMultiBodyPoint2Point.cpp
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@@ -97,7 +97,10 @@ void btMultiBodyPoint2Point::createConstraintRows(btMultiBodyConstraintArray& co
btMultiBodySolverConstraint& constraintRow = constraintRows.expandNonInitializing();
constraintRow.m_solverBodyIdB = 0;
constraintRow.m_solverBodyIdA = data.m_fixedBodyId;
constraintRow.m_solverBodyIdB = data.m_fixedBodyId;
btVector3 contactNormalOnB(0,0,0);
contactNormalOnB[i] = -1;
@@ -107,6 +110,8 @@ void btMultiBodyPoint2Point::createConstraintRows(btMultiBodyConstraintArray& co
btVector3 pivotAworld = m_pivotInA;
if (m_rigidBodyA)
{
constraintRow.m_solverBodyIdA = m_rigidBodyA->getCompanionId();
pivotAworld = m_rigidBodyA->getCenterOfMassTransform()*m_pivotInA;
} else
{
@@ -116,11 +121,13 @@ void btMultiBodyPoint2Point::createConstraintRows(btMultiBodyConstraintArray& co
btVector3 pivotBworld = m_pivotInB;
if (m_rigidBodyB)
{
constraintRow.m_solverBodyIdB = m_rigidBodyB->getCompanionId();
pivotBworld = m_rigidBodyB->getCenterOfMassTransform()*m_pivotInB;
} else
{
if (m_bodyB)
pivotBworld = m_bodyB->localPosToWorld(m_linkB, m_pivotInB);
}
btScalar position = (pivotAworld-pivotBworld).dot(contactNormalOnB);
btScalar relaxation = 1.f;