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Merge pull request #1919 from erwincoumans/master

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btMultiBody: fix indexing issue causing wrong friction to be reported, remove obsolete BT_PYBULLET_GRPC and PYBULLET_EGL
This commit is contained in:
erwincoumans
2018-10-06 19:02:09 -07:00
committed by GitHub
parent c0e38cd921 332cbfa609
commit a1543714f1
3 changed files with 40 additions and 18 deletions
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34
examples/pybullet/examples/contactFriction.py Normal file
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@@ -0,0 +1,34 @@
import pybullet as p
p.connect(p.GUI)
useMaximalCoordinates = False
p.loadURDF("plane.urdf", useMaximalCoordinates=useMaximalCoordinates )
#p.loadURDF("sphere2.urdf",[0,0,1])
p.loadURDF("cube.urdf",[0,0,1], useMaximalCoordinates=useMaximalCoordinates )
p.setGravity(0,3,-10)
while(1):
p.stepSimulation()
pts = p.getContactPoints()
print("num pts=",len(pts))
totalNormalForce = 0
totalFrictionForce = [0,0,0]
totalLateralFrictionForce=[0,0,0]
for pt in pts:
#print("pt.normal=",pt[7])
#print("pt.normalForce=",pt[9])
totalNormalForce += pt[9]
#print("pt.lateralFrictionA=",pt[10])
#print("pt.lateralFrictionADir=",pt[11])
#print("pt.lateralFrictionB=",pt[12])
#print("pt.lateralFrictionBDir=",pt[13])
totalLateralFrictionForce[0]+=pt[11][0]*pt[10]+pt[13][0]*pt[12]
totalLateralFrictionForce[1]+=pt[11][1]*pt[10]+pt[13][1]*pt[12]
totalLateralFrictionForce[2]+=pt[11][2]*pt[10]+pt[13][2]*pt[12]
print("totalNormalForce=",totalNormalForce)
print("totalLateralFrictionForce=",totalLateralFrictionForce)

16
examples/pybullet/pybullet.c
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@@ -9704,30 +9704,14 @@ PyMODINIT_FUNC
#if PY_MAJOR_VERSION >= 3
PyInit_pybullet(void)
#else
#ifdef BT_USE_EGL2
initpybullet_egl(void)
#else
#ifdef BT_PYBULLET_GRPC
initpybullet_grpc(void)
#else
initpybullet(void)
#endif //BT_USE_EGL2
#endif //BT_PYBULLET_GRPC
#endif
{
PyObject* m;
#if PY_MAJOR_VERSION >= 3
m = PyModule_Create(&moduledef);
#else
#ifdef BT_USE_EGL2
m = Py_InitModule3("pybullet_egl", SpamMethods, "Python bindings for Bullet");
#else
#ifdef BT_PYBULLET_GRPC
m = Py_InitModule3("pybullet_grpc", SpamMethods, "Python bindings for Bullet");
#else
m = Py_InitModule3("pybullet", SpamMethods, "Python bindings for Bullet");
#endif //BT_USE_EGL2
#endif //BT_PYBULLET_GRPC
#endif
#if PY_MAJOR_VERSION >= 3

8
src/BulletDynamics/Featherstone/btMultiBodyConstraintSolver.cpp
View File

@@ -1232,7 +1232,7 @@ void btMultiBodyConstraintSolver::convertMultiBodyContact(btPersistentManifold*
/////setup the friction constraints
#define ENABLE_FRICTION
#ifdef ENABLE_FRICTION
solverConstraint.m_frictionIndex = frictionIndex;
solverConstraint.m_frictionIndex = m_multiBodyFrictionContactConstraints.size();
///Bullet has several options to set the friction directions
///By default, each contact has only a single friction direction that is recomputed automatically every frame
@@ -1501,10 +1501,14 @@ btScalar btMultiBodyConstraintSolver::solveGroupCacheFriendlyFinish(btCollisionO
if ((infoGlobal.m_solverMode & SOLVER_USE_2_FRICTION_DIRECTIONS))
{
pt->m_appliedImpulseLateral2 = m_multiBodyFrictionContactConstraints[solverConstraint.m_frictionIndex + 1].m_appliedImpulse;
} else
{
pt->m_appliedImpulseLateral2 = 0;
}
}
//do a callback here?
}
}
#if 0
//multibody joint feedback
{