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Code Issues Releases Wiki Activity

Merge pull request #791 from erwincoumans/master

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default contact erp (m_erp2) was too low in physics server
This commit is contained in:
erwincoumans 2016-09-16 09:19:35 +01:00 committed by GitHub
commit dd791e2222
24 changed files with 160 additions and 84 deletions
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4
data/cube_gripper_left.urdf
View File

@ -6,10 +6,8 @@
<link name="baseLink">
<contact>
<lateral_friction value="1.0"/>
<rolling_friction value="0.3"/>
<spinning_friction value="0.3"/>
<inertia_scaling value="3.0"/>
<contact_cfm value="0.0"/>
<contact_erp value="1.0"/>
</contact>
<inertial>
<origin rpy="0 0 0" xyz="0 0 0"/>

4
data/cube_gripper_right.urdf
View File

@ -6,10 +6,8 @@
<link name="baseLink">
<contact>
<lateral_friction value="1.0"/>
<rolling_friction value="0.3"/>
<spinning_friction value="0.3"/>
<inertia_scaling value="3.0"/>
<contact_cfm value="0.0"/>
<contact_erp value="1.0"/>
</contact>
<inertial>
<origin rpy="0 0 0" xyz="0 0 0"/>

2
data/cube_small.urdf
View File

@ -3,7 +3,7 @@
<link name="baseLink">
<contact>
<lateral_friction value="1.0"/>
<rolling_friction value="0.1"/>
<spinning_friction value="0.1"/>
<inertia_scaling value="3.0"/>
</contact>
<inertial>

3
data/plane.urdf
View File

@ -1,9 +1,6 @@
<?xml version="0.0" ?>
<robot name="cube.urdf">
<link name="baseLink">
<contact>
<rolling_friction value="0.3"/>
</contact>
<inertial>
<origin rpy="0 0 0" xyz="0 0 0"/>
<mass value=".0"/>

1
data/pr2_gripper.urdf
View File

@ -33,6 +33,7 @@
<link name="left_gripper">
<contact>
<lateral_friction value="50.0"/>
<spinning_friction value="0.1"/>
</contact>
<visual>
<origin rpy="0.0 0 0" xyz="0 0 0"/>

1
data/r2d2.urdf
View File

@ -388,6 +388,7 @@
<child link="head"/>
<axis xyz="0 0 1"/>
<origin xyz="0 0 0.3"/>
<limit effort="1000.0" lower="-0.38" upper="0" velocity="0.5"/>
</joint>
<link name="box">

2
examples/CommonInterfaces/CommonExampleInterface.h
View File

@ -46,7 +46,7 @@ public:
virtual bool mouseButtonCallback(int button, int state, float x, float y)=0;
virtual bool keyboardCallback(int key, int state)=0;
virtual void vrControllerMoveCallback(int controllerId, float pos[4], float orientation[4]) {}
virtual void vrControllerMoveCallback(int controllerId, float pos[4], float orientation[4], float analogAxis) {}
virtual void vrControllerButtonCallback(int controllerId, int button, int state, float pos[4], float orientation[4]){}
};

4
examples/Importers/ImportURDFDemo/URDF2Bullet.cpp
View File

@ -410,6 +410,10 @@ void ConvertURDF2BulletInternal(
{
col->setRollingFriction(contactInfo.m_rollingFriction);
}
if ((contactInfo.m_flags & URDF_CONTACT_HAS_SPINNING_FRICTION)!=0)
{
col->setSpinningFriction(contactInfo.m_spinningFriction);
}
if ((contactInfo.m_flags & URDF_CONTACT_HAS_STIFFNESS_DAMPING)!=0)
{
col->setContactStiffnessAndDamping(contactInfo.m_contactStiffness,contactInfo.m_contactDamping);

6
examples/Importers/ImportURDFDemo/URDFJointTypes.h
View File

@ -16,17 +16,20 @@ enum UrdfJointTypes
enum URDF_LinkContactFlags
{
URDF_CONTACT_HAS_LATERAL_FRICTION=1,
URDF_CONTACT_HAS_ROLLING_FRICTION=2,
URDF_CONTACT_HAS_INERTIA_SCALING=2,
URDF_CONTACT_HAS_CONTACT_CFM=4,
URDF_CONTACT_HAS_CONTACT_ERP=8,
URDF_CONTACT_HAS_STIFFNESS_DAMPING=16,
URDF_CONTACT_HAS_ROLLING_FRICTION=32,
URDF_CONTACT_HAS_SPINNING_FRICTION=64,
};
struct URDFLinkContactInfo
{
btScalar m_lateralFriction;
btScalar m_rollingFriction;
btScalar m_spinningFriction;
btScalar m_inertiaScaling;
btScalar m_contactCfm;
btScalar m_contactErp;
@ -38,6 +41,7 @@ struct URDFLinkContactInfo
URDFLinkContactInfo()
:m_lateralFriction(0.5),
m_rollingFriction(0),
m_spinningFriction(0),
m_inertiaScaling(1),
m_contactCfm(0),
m_contactErp(0),

21
examples/Importers/ImportURDFDemo/UrdfParser.cpp
View File

@ -672,7 +672,28 @@ bool UrdfParser::parseLink(UrdfModel& model, UrdfLink& link, TiXmlElement *confi
}
}
}
{
TiXmlElement *spinning_xml = ci->FirstChildElement("spinning_friction");
if (spinning_xml)
{
if (m_parseSDF)
{
link.m_contactInfo.m_spinningFriction = urdfLexicalCast<double>(spinning_xml->GetText());
link.m_contactInfo.m_flags |= URDF_CONTACT_HAS_SPINNING_FRICTION;
} else
{
if (!spinning_xml->Attribute("value"))
{
logger->reportError("Link/contact: spinning friction element must have value attribute");
return false;
}
link.m_contactInfo.m_spinningFriction = urdfLexicalCast<double>(spinning_xml->Attribute("value"));
link.m_contactInfo.m_flags |= URDF_CONTACT_HAS_SPINNING_FRICTION;
}
}
}
{
TiXmlElement *stiffness_xml = ci->FirstChildElement("stiffness");

43
examples/SharedMemory/PhysicsServerCommandProcessor.cpp
View File

@ -27,6 +27,8 @@
#include "../CommonInterfaces/CommonGUIHelperInterface.h"
#include "SharedMemoryCommands.h"
btVector3 gLastPickPos(0, 0, 0);
struct UrdfLinkNameMapUtil
{
btMultiBody* m_mb;
@ -383,7 +385,7 @@ struct PhysicsServerCommandProcessorInternalData
btMultiBodyFixedConstraint* m_gripperRigidbodyFixed;
btMultiBody* m_gripperMultiBody;
int m_huskyId;
CommandLogger* m_commandLogger;
CommandLogPlayback* m_logPlayback;
@ -435,6 +437,7 @@ struct PhysicsServerCommandProcessorInternalData
m_gripperRigidbodyFixed(0),
m_gripperMultiBody(0),
m_allowRealTimeSimulation(false),
m_huskyId(0),
m_commandLogger(0),
m_logPlayback(0),
m_physicsDeltaTime(1./240.),
@ -593,7 +596,7 @@ void PhysicsServerCommandProcessor::createEmptyDynamicsWorld()
m_data->m_dynamicsWorld->setGravity(btVector3(0, 0, 0));
m_data->m_dynamicsWorld->getSolverInfo().m_erp2 = 0.005;
m_data->m_dynamicsWorld->getSolverInfo().m_erp2 = 0.05;
}
void PhysicsServerCommandProcessor::deleteCachedInverseDynamicsBodies()
@ -1874,10 +1877,15 @@ bool PhysicsServerCommandProcessor::processCommand(const struct SharedMemoryComm
{
applyJointDamping(i);
}
if (m_data->m_numSimulationSubSteps > 0)
{
m_data->m_dynamicsWorld->stepSimulation(m_data->m_physicsDeltaTime, m_data->m_numSimulationSubSteps, m_data->m_physicsDeltaTime / m_data->m_numSimulationSubSteps);
}
else
{
m_data->m_dynamicsWorld->stepSimulation(m_data->m_physicsDeltaTime, 0);
}
SharedMemoryStatus& serverCmd =serverStatusOut;
serverCmd.m_type = CMD_STEP_FORWARD_SIMULATION_COMPLETED;
@ -2678,7 +2686,7 @@ void PhysicsServerCommandProcessor::physicsDebugDraw(int debugDrawFlags)
}
}
btVector3 gLastPickPos(0,0,0);
bool PhysicsServerCommandProcessor::pickBody(const btVector3& rayFromWorld, const btVector3& rayToWorld)
{
@ -2832,6 +2840,7 @@ void PhysicsServerCommandProcessor::replayFromLogFile(const char* fileName)
btVector3 gVRGripperPos(0,0,0);
btQuaternion gVRGripperOrn(0,0,0,1);
btScalar gVRGripperAnalog = 0;
bool gVRGripperClosed = false;
@ -2860,7 +2869,7 @@ void PhysicsServerCommandProcessor::stepSimulationRealTime(double dtInSec)
{
int bodyId = 0;
if (loadUrdf("pr2_gripper.urdf", btVector3(0, 0, 1), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size()))
if (loadUrdf("pr2_gripper.urdf", btVector3(0, 0, 0.1), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size()))
{
InteralBodyData* parentBody = m_data->getHandle(bodyId);
if (parentBody->m_multiBody)
@ -2878,14 +2887,25 @@ void PhysicsServerCommandProcessor::stepSimulationRealTime(double dtInSec)
m_data->m_gripperMultiBody = parentBody->m_multiBody;
if (m_data->m_gripperMultiBody->getNumLinks() > 2)
{
m_data->m_gripperMultiBody->setJointPos(0, SIMD_HALF_PI);
m_data->m_gripperMultiBody->setJointPos(2, SIMD_HALF_PI);
m_data->m_gripperMultiBody->setJointPos(0, 0);
m_data->m_gripperMultiBody->setJointPos(2, 0);
}
m_data->m_gripperRigidbodyFixed->setMaxAppliedImpulse(1.);
btMultiBodyDynamicsWorld* world = (btMultiBodyDynamicsWorld*)m_data->m_dynamicsWorld;
world->addMultiBodyConstraint(m_data->m_gripperRigidbodyFixed);
}
}
loadUrdf("sphere2.urdf", btVector3(-2, 0, 1), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size());
loadUrdf("sphere2.urdf", btVector3(-2, 0, 2), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size());
loadUrdf("sphere2.urdf", btVector3(-2, 0, 3), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size());
loadUrdf("samurai.urdf", btVector3(0, 0, 0), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size());
loadUrdf("kuka_iiwa/model.urdf", btVector3(3, 0, 0), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size());
loadUrdf("cube_small.urdf", btVector3(0, 0, 1), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size());
loadUrdf("husky/husky.urdf", btVector3(1, 1, 1), btQuaternion(0, 0, 0, 1), true, false, &bodyId, &gBufferServerToClient[0], gBufferServerToClient.size());
m_data->m_huskyId = bodyId;
}
}
@ -2904,14 +2924,9 @@ void PhysicsServerCommandProcessor::stepSimulationRealTime(double dtInSec)
{
motor->setErp(0.01);
if (gVRGripperClosed)
{
motor->setPositionTarget(0.2, 1);
}
else
{
motor->setPositionTarget(SIMD_HALF_PI, 1);
}
motor->setPositionTarget(0.1+(1-gVRGripperAnalog)*SIMD_HALF_PI*0.5, 1);
motor->setVelocityTarget(0, 0.1);
btScalar maxImp = 1550.*m_data->m_physicsDeltaTime;
motor->setMaxAppliedImpulse(maxImp);

17
examples/SharedMemory/PhysicsServerExample.cpp
View File

@ -18,6 +18,8 @@
extern btVector3 gLastPickPos;
btVector3 gVRTeleportPos(0,0,0);
btQuaternion gVRTeleportOrn(0, 0, 0,1);
extern bool gVRGripperClosed;
bool gDebugRenderToggle = false;
@ -556,7 +558,7 @@ public:
btVector3 getRayTo(int x,int y);
virtual void vrControllerButtonCallback(int controllerId, int button, int state, float pos[4], float orientation[4]);
virtual void vrControllerMoveCallback(int controllerId, float pos[4], float orientation[4]);
virtual void vrControllerMoveCallback(int controllerId, float pos[4], float orientation[4], float analogAxis);
virtual bool mouseMoveCallback(float x,float y)
{
@ -894,6 +896,7 @@ void PhysicsServerExample::renderScene()
///debug rendering
//m_args[0].m_cs->lock();
//gVRTeleportPos[0] += 0.01;
vrOffset[12]=-gVRTeleportPos[0];
vrOffset[13]=-gVRTeleportPos[1];
vrOffset[14]=-gVRTeleportPos[2];
@ -1101,7 +1104,7 @@ class CommonExampleInterface* PhysicsServerCreateFunc(struct CommonExampleOpt
}
static int gGraspingController = 2;
static int gGraspingController = -1;
void PhysicsServerExample::vrControllerButtonCallback(int controllerId, int button, int state, float pos[4], float orn[4])
{
@ -1110,6 +1113,8 @@ void PhysicsServerExample::vrControllerButtonCallback(int controllerId, int butt
if (controllerId<0 || controllerId>=MAX_VR_CONTROLLERS)
return;
if (gGraspingController < 0)
gGraspingController = controllerId;
if (controllerId != gGraspingController)
{
@ -1151,10 +1156,15 @@ void PhysicsServerExample::vrControllerButtonCallback(int controllerId, int butt
extern btVector3 gVRGripperPos;
extern btQuaternion gVRGripperOrn;
extern btScalar gVRGripperAnalog;
void PhysicsServerExample::vrControllerMoveCallback(int controllerId, float pos[4], float orn[4])
void PhysicsServerExample::vrControllerMoveCallback(int controllerId, float pos[4], float orn[4], float analogAxis)
{
if (controllerId <= 0 || controllerId >= MAX_VR_CONTROLLERS)
{
printf("Controller Id exceeds max: %d > %d", controllerId, MAX_VR_CONTROLLERS);
@ -1162,6 +1172,7 @@ void PhysicsServerExample::vrControllerMoveCallback(int controllerId, float pos[
}
if (controllerId == gGraspingController)
{
gVRGripperAnalog = analogAxis;
gVRGripperPos.setValue(pos[0] + gVRTeleportPos[0], pos[1] + gVRTeleportPos[1], pos[2] + gVRTeleportPos[2]);
btQuaternion orgOrn(orn[0], orn[1], orn[2], orn[3]);
gVRGripperOrn = orgOrn*btQuaternion(btVector3(0, 0, 1), SIMD_HALF_PI)*btQuaternion(btVector3(0, 1, 0), SIMD_HALF_PI);

7
examples/StandaloneMain/hellovr_opengl_main.cpp
View File

@ -713,14 +713,17 @@ bool CMainApplication::HandleInput()
}
else
{
// printf("Device MOVED: %d\n", unDevice);
sExample->vrControllerMoveCallback(unDevice, pos, orn);
sExample->vrControllerMoveCallback(unDevice, pos, orn, state.rAxis[1].x);
}
}
else
{
if( m_pHMD->GetTrackedDeviceClass( unDevice) == vr::TrackedDeviceClass_Controller )
{
b3Transform tr;
getControllerTransform(unDevice, tr);
float pos[3] = { tr.getOrigin()[0], tr.getOrigin()[1], tr.getOrigin()[2] };
@ -741,7 +744,7 @@ bool CMainApplication::HandleInput()
} else
{
sExample->vrControllerMoveCallback(unDevice, pos, orn);
sExample->vrControllerMoveCallback(unDevice, pos, orn, state.rAxis[1].x);
}
}
}

1
src/BulletCollision/CollisionDispatch/btCollisionObject.cpp
View File

@ -33,6 +33,7 @@ btCollisionObject::btCollisionObject()
m_friction(btScalar(0.5)),
m_restitution(btScalar(0.)),
m_rollingFriction(0.0f),
m_spinningFriction(0.f),
m_contactDamping(.1),
m_contactStiffness(1e4),
m_internalType(CO_COLLISION_OBJECT),

13
src/BulletCollision/CollisionDispatch/btCollisionObject.h
View File

@ -85,7 +85,8 @@ protected:
btScalar m_friction;
btScalar m_restitution;
btScalar m_rollingFriction;
btScalar m_rollingFriction;//torsional friction orthogonal to contact normal (useful to stop spheres rolling forever)
btScalar m_spinningFriction; // torsional friction around the contact normal (useful for grasping)
btScalar m_contactDamping;
btScalar m_contactStiffness;
@ -323,7 +324,15 @@ public:
{
return m_rollingFriction;
}
void setSpinningFriction(btScalar frict)
{
m_updateRevision++;
m_spinningFriction = frict;
}
btScalar getSpinningFriction() const
{
return m_spinningFriction;
}
void setContactStiffnessAndDamping(btScalar stiffness, btScalar damping)
{
m_updateRevision++;

13
src/BulletCollision/CollisionDispatch/btManifoldResult.cpp
View File

@ -24,7 +24,6 @@ ContactAddedCallback gContactAddedCallback=0;
///User can override this material combiner by implementing gContactAddedCallback and setting body0->m_collisionFlags |= btCollisionObject::customMaterialCallback;
btScalar btManifoldResult::calculateCombinedRollingFriction(const btCollisionObject* body0,const btCollisionObject* body1)
{
btScalar friction = body0->getRollingFriction() * body1->getFriction() + body1->getRollingFriction() * body0->getFriction();
@ -38,6 +37,17 @@ btScalar btManifoldResult::calculateCombinedRollingFriction(const btCollisionObj
}
btScalar btManifoldResult::calculateCombinedSpinningFriction(const btCollisionObject* body0,const btCollisionObject* body1)
{
btScalar friction = body0->getSpinningFriction() * body1->getFriction() + body1->getSpinningFriction() * body0->getFriction();
const btScalar MAX_FRICTION = btScalar(10.);
if (friction < -MAX_FRICTION)
friction = -MAX_FRICTION;
if (friction > MAX_FRICTION)
friction = MAX_FRICTION;
return friction;
}
///User can override this material combiner by implementing gContactAddedCallback and setting body0->m_collisionFlags |= btCollisionObject::customMaterialCallback;
btScalar btManifoldResult::calculateCombinedFriction(const btCollisionObject* body0,const btCollisionObject* body1)
@ -125,6 +135,7 @@ void btManifoldResult::addContactPoint(const btVector3& normalOnBInWorld,const b
newPt.m_combinedFriction = calculateCombinedFriction(m_body0Wrap->getCollisionObject(),m_body1Wrap->getCollisionObject());
newPt.m_combinedRestitution = calculateCombinedRestitution(m_body0Wrap->getCollisionObject(),m_body1Wrap->getCollisionObject());
newPt.m_combinedRollingFriction = calculateCombinedRollingFriction(m_body0Wrap->getCollisionObject(),m_body1Wrap->getCollisionObject());
newPt.m_combinedSpinningFriction = calculateCombinedSpinningFriction(m_body0Wrap->getCollisionObject(),m_body1Wrap->getCollisionObject());
if ( (m_body0Wrap->getCollisionObject()->getCollisionFlags()& btCollisionObject::CF_HAS_CONTACT_STIFFNESS_DAMPING) ||
(m_body1Wrap->getCollisionObject()->getCollisionFlags()& btCollisionObject::CF_HAS_CONTACT_STIFFNESS_DAMPING))

1
src/BulletCollision/CollisionDispatch/btManifoldResult.h
View File

@ -146,6 +146,7 @@ public:
static btScalar calculateCombinedRestitution(const btCollisionObject* body0,const btCollisionObject* body1);
static btScalar calculateCombinedFriction(const btCollisionObject* body0,const btCollisionObject* body1);
static btScalar calculateCombinedRollingFriction(const btCollisionObject* body0,const btCollisionObject* body1);
static btScalar calculateCombinedSpinningFriction(const btCollisionObject* body0,const btCollisionObject* body1);
static btScalar calculateCombinedContactDamping(const btCollisionObject* body0,const btCollisionObject* body1);
static btScalar calculateCombinedContactStiffness(const btCollisionObject* body0,const btCollisionObject* body1);
};

4
src/BulletCollision/NarrowPhaseCollision/btManifoldPoint.h
View File

@ -72,6 +72,7 @@ class btManifoldPoint
m_distance1( distance ),
m_combinedFriction(btScalar(0.)),
m_combinedRollingFriction(btScalar(0.)),
m_combinedSpinningFriction(btScalar(0.)),
m_combinedRestitution(btScalar(0.)),
m_userPersistentData(0),
m_contactPointFlags(0),
@ -99,7 +100,8 @@ class btManifoldPoint
btScalar m_distance1;
btScalar m_combinedFriction;
btScalar m_combinedRollingFriction;
btScalar m_combinedRollingFriction;//torsional friction orthogonal to contact normal, useful to make spheres stop rolling forever
btScalar m_combinedSpinningFriction;//torsional friction around contact normal, useful for grasping objects
btScalar m_combinedRestitution;
//BP mod, store contact triangles.

35
src/BulletDynamics/ConstraintSolver/btSequentialImpulseConstraintSolver.cpp
View File

@ -627,8 +627,8 @@ btSolverConstraint& btSequentialImpulseConstraintSolver::addFrictionConstraint(c
}
void btSequentialImpulseConstraintSolver::setupRollingFrictionConstraint( btSolverConstraint& solverConstraint, const btVector3& normalAxis1,int solverBodyIdA,int solverBodyIdB,
btManifoldPoint& cp,const btVector3& rel_pos1,const btVector3& rel_pos2,
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)
@ -647,7 +647,7 @@ void btSequentialImpulseConstraintSolver::setupRollingFrictionConstraint( btSolv
solverConstraint.m_solverBodyIdA = solverBodyIdA;
solverConstraint.m_solverBodyIdB = solverBodyIdB;
solverConstraint.m_friction = cp.m_combinedRollingFriction;
solverConstraint.m_friction = combinedTorsionalFriction;
solverConstraint.m_originalContactPoint = 0;
solverConstraint.m_appliedImpulse = 0.f;
@ -704,11 +704,11 @@ void btSequentialImpulseConstraintSolver::setupRollingFrictionConstraint( btSolv
btSolverConstraint& btSequentialImpulseConstraintSolver::addRollingFrictionConstraint(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, btScalar desiredVelocity, btScalar cfmSlip)
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;
setupRollingFrictionConstraint(solverConstraint, normalAxis, solverBodyIdA, solverBodyIdB, cp, rel_pos1, rel_pos2,
setupTorsionalFrictionConstraint(solverConstraint, normalAxis, solverBodyIdA, solverBodyIdB, cp, combinedTorsionalFriction,rel_pos1, rel_pos2,
colObj0, colObj1, relaxation, desiredVelocity, cfmSlip);
return solverConstraint;
}
@ -1069,28 +1069,11 @@ void btSequentialImpulseConstraintSolver::convertContact(btPersistentManifold* m
solverConstraint.m_frictionIndex = m_tmpSolverContactFrictionConstraintPool.size();
btVector3 angVelA(0,0,0),angVelB(0,0,0);
if (rb0)
angVelA = rb0->getAngularVelocity();
if (rb1)
angVelB = rb1->getAngularVelocity();
btVector3 relAngVel = angVelB-angVelA;
if ((cp.m_combinedRollingFriction>0.f) && (rollingFriction>0))
{
//only a single rollingFriction per manifold
//rollingFriction--;
if (relAngVel.length()>infoGlobal.m_singleAxisRollingFrictionThreshold)
{
relAngVel.normalize();
applyAnisotropicFriction(colObj0,relAngVel,btCollisionObject::CF_ANISOTROPIC_ROLLING_FRICTION);
applyAnisotropicFriction(colObj1,relAngVel,btCollisionObject::CF_ANISOTROPIC_ROLLING_FRICTION);
if (relAngVel.length()>0.001)
addRollingFrictionConstraint(relAngVel,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
} else
{
addRollingFrictionConstraint(cp.m_normalWorldOnB,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
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();
@ -1101,9 +1084,11 @@ void btSequentialImpulseConstraintSolver::convertContact(btPersistentManifold* m
applyAnisotropicFriction(colObj0,axis1,btCollisionObject::CF_ANISOTROPIC_ROLLING_FRICTION);
applyAnisotropicFriction(colObj1,axis1,btCollisionObject::CF_ANISOTROPIC_ROLLING_FRICTION);
if (axis0.length()>0.001)
addRollingFrictionConstraint(axis0,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
addTorsionalFrictionConstraint(axis0,solverBodyIdA,solverBodyIdB,frictionIndex,cp,
cp.m_combinedRollingFriction, rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
if (axis1.length()>0.001)
addRollingFrictionConstraint(axis1,solverBodyIdA,solverBodyIdB,frictionIndex,cp,rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
addTorsionalFrictionConstraint(axis1,solverBodyIdA,solverBodyIdB,frictionIndex,cp,
cp.m_combinedRollingFriction, rel_pos1,rel_pos2,colObj0,colObj1, relaxation);
}
}

6
src/BulletDynamics/ConstraintSolver/btSequentialImpulseConstraintSolver.h
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@ -54,13 +54,13 @@ protected:
btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation,
btScalar desiredVelocity=0., btScalar cfmSlip=0.);
void setupRollingFrictionConstraint( btSolverConstraint& solverConstraint, const btVector3& normalAxis,int solverBodyIdA,int solverBodyIdB,
btManifoldPoint& cp,const btVector3& rel_pos1,const btVector3& rel_pos2,
void setupTorsionalFrictionConstraint( btSolverConstraint& solverConstraint, const btVector3& normalAxis,int solverBodyIdA,int solverBodyIdB,
btManifoldPoint& cp,btScalar combinedTorsionalFriction, const btVector3& rel_pos1,const btVector3& rel_pos2,
btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation,
btScalar desiredVelocity=0., btScalar cfmSlip=0.);
btSolverConstraint& 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, btScalar desiredVelocity=0., btScalar cfmSlip=0.);
btSolverConstraint& addRollingFrictionConstraint(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, btScalar desiredVelocity=0, btScalar cfmSlip=0.f);
btSolverConstraint& addTorsionalFrictionConstraint(const btVector3& normalAxis,int solverBodyIdA,int solverBodyIdB,int frictionIndex,btManifoldPoint& cp,btScalar torsionalFriction, const btVector3& rel_pos1,const btVector3& rel_pos2,btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, btScalar desiredVelocity=0, btScalar cfmSlip=0.f);
void setupContactConstraint(btSolverConstraint& solverConstraint, int solverBodyIdA, int solverBodyIdB, btManifoldPoint& cp,

2
src/BulletDynamics/Dynamics/btRigidBody.cpp
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@ -79,6 +79,8 @@ void btRigidBody::setupRigidBody(const btRigidBody::btRigidBodyConstructionInfo&
//moved to btCollisionObject
m_friction = constructionInfo.m_friction;
m_rollingFriction = constructionInfo.m_rollingFriction;
m_spinningFriction = constructionInfo.m_spinningFriction;
m_restitution = constructionInfo.m_restitution;
setCollisionShape( constructionInfo.m_collisionShape );

3
src/BulletDynamics/Dynamics/btRigidBody.h
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@ -135,6 +135,8 @@ public:
///the m_rollingFriction prevents rounded shapes, such as spheres, cylinders and capsules from rolling forever.
///See Bullet/Demos/RollingFrictionDemo for usage
btScalar m_rollingFriction;
btScalar m_spinningFriction;//torsional friction around contact normal
///best simulation results using zero restitution.
btScalar m_restitution;
@ -158,6 +160,7 @@ public:
m_angularDamping(btScalar(0.)),
m_friction(btScalar(0.5)),
m_rollingFriction(btScalar(0)),
m_spinningFriction(btScalar(0)),
m_restitution(btScalar(0.)),
m_linearSleepingThreshold(btScalar(0.8)),
m_angularSleepingThreshold(btScalar(1.f)),

20
src/BulletDynamics/Featherstone/btMultiBodyConstraintSolver.cpp
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@ -557,9 +557,11 @@ void btMultiBodyConstraintSolver::setupMultiBodyContactConstraint(btMultiBodySol
}
void btMultiBodyConstraintSolver::setupMultiBodyRollingFrictionConstraint(btMultiBodySolverConstraint& solverConstraint,
void btMultiBodyConstraintSolver::setupMultiBodyTorsionalFrictionConstraint(btMultiBodySolverConstraint& solverConstraint,
const btVector3& constraintNormal,
btManifoldPoint& cp, const btContactSolverInfo& infoGlobal,
btManifoldPoint& cp,
btScalar combinedTorsionalFriction,
const btContactSolverInfo& infoGlobal,
btScalar& relaxation,
bool isFriction, btScalar desiredVelocity, btScalar cfmSlip)
{
@ -784,7 +786,7 @@ void btMultiBodyConstraintSolver::setupMultiBodyRollingFrictionConstraint(btMult
}
}
solverConstraint.m_friction = cp.m_combinedRollingFriction;
solverConstraint.m_friction =combinedTorsionalFriction;
if(!isFriction)
{
@ -860,7 +862,9 @@ btMultiBodySolverConstraint& btMultiBodyConstraintSolver::addMultiBodyFrictionCo
return solverConstraint;
}
btMultiBodySolverConstraint& btMultiBodyConstraintSolver::addMultiBodyRollingFrictionConstraint(const btVector3& normalAxis,btPersistentManifold* manifold,int frictionIndex,btManifoldPoint& cp,btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, const btContactSolverInfo& infoGlobal, btScalar desiredVelocity, btScalar cfmSlip)
btMultiBodySolverConstraint& btMultiBodyConstraintSolver::addMultiBodyTorsionalFrictionConstraint(const btVector3& normalAxis,btPersistentManifold* manifold,int frictionIndex,btManifoldPoint& cp,
btScalar combinedTorsionalFriction,
btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, const btContactSolverInfo& infoGlobal, btScalar desiredVelocity, btScalar cfmSlip)
{
BT_PROFILE("addMultiBodyRollingFrictionConstraint");
btMultiBodySolverConstraint& solverConstraint = m_multiBodyFrictionContactConstraints.expandNonInitializing();
@ -891,7 +895,7 @@ btMultiBodySolverConstraint& btMultiBodyConstraintSolver::addMultiBodyRollingFri
solverConstraint.m_originalContactPoint = &cp;
setupMultiBodyRollingFrictionConstraint(solverConstraint, normalAxis, cp, infoGlobal,relaxation,isFriction, desiredVelocity, cfmSlip);
setupMultiBodyTorsionalFrictionConstraint(solverConstraint, normalAxis, cp, combinedTorsionalFriction,infoGlobal,relaxation,isFriction, desiredVelocity, cfmSlip);
return solverConstraint;
}
@ -1010,9 +1014,9 @@ void btMultiBodyConstraintSolver::convertMultiBodyContact(btPersistentManifold*
if (rollingFriction > 0)
{
addMultiBodyRollingFrictionConstraint(cp.m_normalWorldOnB,manifold,frictionIndex,cp,colObj0,colObj1, relaxation,infoGlobal);
//addMultiBodyRollingFrictionConstraint(cp.m_lateralFrictionDir1,manifold,frictionIndex,cp,colObj0,colObj1, relaxation,infoGlobal);
//addMultiBodyRollingFrictionConstraint(cp.m_lateralFrictionDir2,manifold,frictionIndex,cp,colObj0,colObj1, relaxation,infoGlobal);
addMultiBodyTorsionalFrictionConstraint(cp.m_normalWorldOnB,manifold,frictionIndex,cp,cp.m_combinedSpinningFriction, colObj0,colObj1, relaxation,infoGlobal);
addMultiBodyTorsionalFrictionConstraint(cp.m_lateralFrictionDir1,manifold,frictionIndex,cp,cp.m_combinedRollingFriction, colObj0,colObj1, relaxation,infoGlobal);
addMultiBodyTorsionalFrictionConstraint(cp.m_lateralFrictionDir2,manifold,frictionIndex,cp,cp.m_combinedRollingFriction, colObj0,colObj1, relaxation,infoGlobal);
rollingFriction--;
}

11
src/BulletDynamics/Featherstone/btMultiBodyConstraintSolver.h
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@ -50,7 +50,9 @@ protected:
btMultiBodySolverConstraint& addMultiBodyFrictionConstraint(const btVector3& normalAxis,btPersistentManifold* manifold,int frictionIndex,btManifoldPoint& cp,btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, const btContactSolverInfo& infoGlobal, btScalar desiredVelocity=0, btScalar cfmSlip=0);
btMultiBodySolverConstraint& addMultiBodyRollingFrictionConstraint(const btVector3& normalAxis,btPersistentManifold* manifold,int frictionIndex,btManifoldPoint& cp,btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, const btContactSolverInfo& infoGlobal, btScalar desiredVelocity=0, btScalar cfmSlip=0);
btMultiBodySolverConstraint& addMultiBodyTorsionalFrictionConstraint(const btVector3& normalAxis,btPersistentManifold* manifold,int frictionIndex,btManifoldPoint& cp,
btScalar combinedTorsionalFriction,
btCollisionObject* colObj0,btCollisionObject* colObj1, btScalar relaxation, const btContactSolverInfo& infoGlobal, btScalar desiredVelocity=0, btScalar cfmSlip=0);
void setupMultiBodyJointLimitConstraint(btMultiBodySolverConstraint& constraintRow,
btScalar* jacA,btScalar* jacB,
@ -63,9 +65,12 @@ protected:
btScalar& relaxation,
bool isFriction, btScalar desiredVelocity=0, btScalar cfmSlip=0);
void setupMultiBodyRollingFrictionConstraint(btMultiBodySolverConstraint& solverConstraint,
//either rolling or spinning friction
void setupMultiBodyTorsionalFrictionConstraint(btMultiBodySolverConstraint& solverConstraint,
const btVector3& contactNormal,
btManifoldPoint& cp, const btContactSolverInfo& infoGlobal,
btManifoldPoint& cp,
btScalar combinedTorsionalFriction,
const btContactSolverInfo& infoGlobal,
btScalar& relaxation,
bool isFriction, btScalar desiredVelocity=0, btScalar cfmSlip=0);