void MultiBodyVehicleSetup::initPhysics(GraphicsPhysicsBridge& gfxBridge)
{
int upAxis = 1;
btVector4 colors[4] =
{
btVector4(1,0,0,1),
btVector4(0,1,0,1),
btVector4(0,1,1,1),
btVector4(1,1,0,1),
};
int curColor = 0;
gfxBridge.setUpAxis(upAxis);
this->createEmptyDynamicsWorld();
gfxBridge.createPhysicsDebugDrawer(m_dynamicsWorld);
m_dynamicsWorld->getDebugDrawer()->setDebugMode(
//btIDebugDraw::DBG_DrawConstraints
+btIDebugDraw::DBG_DrawWireframe
+btIDebugDraw::DBG_DrawContactPoints
+btIDebugDraw::DBG_DrawAabb
);//+btIDebugDraw::DBG_DrawConstraintLimits);
createMultiBodyVehicle();
if (1)
{
btVector3 groundHalfExtents(20,20,20);
groundHalfExtents[upAxis]=1.f;
btBoxShape* box = new btBoxShape(groundHalfExtents);
box->initializePolyhedralFeatures();
gfxBridge.createCollisionShapeGraphicsObject(box);
btTransform start; start.setIdentity();
btVector3 groundOrigin(0,0,0);
groundOrigin[upAxis]=-1.5;
start.setOrigin(groundOrigin);
btRigidBody* body = createRigidBody(0,start,box);
btVector4 color = colors[curColor];
curColor++;
curColor&=3;
gfxBridge.createRigidBodyGraphicsObject(body,color);
}
}
void ImportUrdfSetup::initPhysics()
{
m_guiHelper->setUpAxis(m_upAxis);
this->createEmptyDynamicsWorld();
//m_dynamicsWorld->getSolverInfo().m_numIterations = 100;
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
m_dynamicsWorld->getDebugDrawer()->setDebugMode(
btIDebugDraw::DBG_DrawConstraints
+btIDebugDraw::DBG_DrawContactPoints
+btIDebugDraw::DBG_DrawAabb
);//+btIDebugDraw::DBG_DrawConstraintLimits);
if (m_guiHelper->getParameterInterface())
{
SliderParams slider("Gravity", &m_grav);
slider.m_minVal = -10;
slider.m_maxVal = 10;
m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
}
BulletURDFImporter u2b(m_guiHelper, 0);
bool loadOk = u2b.loadURDF(m_fileName);
#ifdef TEST_MULTIBODY_SERIALIZATION
//test to serialize a multibody to disk or shared memory, with base, link and joint names
btSerializer* s = new btDefaultSerializer;
#endif //TEST_MULTIBODY_SERIALIZATION
if (loadOk)
{
//printTree(u2b,u2b.getRootLinkIndex());
//u2b.printTree();
btTransform identityTrans;
identityTrans.setIdentity();
{
//todo: move these internal API called inside the 'ConvertURDF2Bullet' call, hidden from the user
//int rootLinkIndex = u2b.getRootLinkIndex();
//b3Printf("urdf root link index = %d\n",rootLinkIndex);
MyMultiBodyCreator creation(m_guiHelper);
ConvertURDF2Bullet(u2b,creation, identityTrans,m_dynamicsWorld,m_useMultiBody,u2b.getPathPrefix());
m_data->m_rb = creation.getRigidBody();
m_data->m_mb = creation.getBulletMultiBody();
btMultiBody* mb = m_data->m_mb;
for (int i = 0; i < u2b.getNumAllocatedCollisionShapes(); i++)
{
m_collisionShapes.push_back(u2b.getAllocatedCollisionShape(i));
}
if (m_useMultiBody && mb )
{
std::string* name = new std::string(u2b.getLinkName(u2b.getRootLinkIndex()));
m_nameMemory.push_back(name);
#ifdef TEST_MULTIBODY_SERIALIZATION
s->registerNameForPointer(name->c_str(),name->c_str());
#endif//TEST_MULTIBODY_SERIALIZATION
mb->setBaseName(name->c_str());
//create motors for each btMultiBody joint
int numLinks = mb->getNumLinks();
for (int i=0;i<numLinks;i++)
{
int mbLinkIndex = i;
int urdfLinkIndex = creation.m_mb2urdfLink[mbLinkIndex];
std::string* jointName = new std::string(u2b.getJointName(urdfLinkIndex));
std::string* linkName = new std::string(u2b.getLinkName(urdfLinkIndex).c_str());
#ifdef TEST_MULTIBODY_SERIALIZATION
s->registerNameForPointer(jointName->c_str(),jointName->c_str());
s->registerNameForPointer(linkName->c_str(),linkName->c_str());
#endif//TEST_MULTIBODY_SERIALIZATION
m_nameMemory.push_back(jointName);
m_nameMemory.push_back(linkName);
mb->getLink(i).m_linkName = linkName->c_str();
mb->getLink(i).m_jointName = jointName->c_str();
if (mb->getLink(mbLinkIndex).m_jointType==btMultibodyLink::eRevolute
||mb->getLink(mbLinkIndex).m_jointType==btMultibodyLink::ePrismatic
)
{
if (m_data->m_numMotors<MAX_NUM_MOTORS)
{
char motorName[1024];
sprintf(motorName,"%s q'", jointName->c_str());
btScalar* motorVel = &m_data->m_motorTargetVelocities[m_data->m_numMotors];
*motorVel = 0.f;
SliderParams slider(motorName,motorVel);
slider.m_minVal=-4;
slider.m_maxVal=4;
m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
float maxMotorImpulse = 10.1f;
btMultiBodyJointMotor* motor = new btMultiBodyJointMotor(mb,mbLinkIndex,0,0,maxMotorImpulse);
//motor->setMaxAppliedImpulse(0);
m_data->m_jointMotors[m_data->m_numMotors]=motor;
m_dynamicsWorld->addMultiBodyConstraint(motor);
m_data->m_numMotors++;
}
}
}
} else
{
if (1)
{
//create motors for each generic joint
int num6Dof = creation.getNum6DofConstraints();
for (int i=0;i<num6Dof;i++)
{
btGeneric6DofSpring2Constraint* c = creation.get6DofConstraint(i);
if (c->getUserConstraintPtr())
{
GenericConstraintUserInfo* jointInfo = (GenericConstraintUserInfo*)c->getUserConstraintPtr();
if ((jointInfo->m_urdfJointType ==URDFRevoluteJoint) ||
(jointInfo->m_urdfJointType ==URDFPrismaticJoint) ||
(jointInfo->m_urdfJointType ==URDFContinuousJoint))
{
int urdfLinkIndex = jointInfo->m_urdfIndex;
std::string jointName = u2b.getJointName(urdfLinkIndex);
char motorName[1024];
sprintf(motorName,"%s q'", jointName.c_str());
btScalar* motorVel = &m_data->m_motorTargetVelocities[m_data->m_numMotors];
*motorVel = 0.f;
SliderParams slider(motorName,motorVel);
slider.m_minVal=-4;
slider.m_maxVal=4;
m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
m_data->m_generic6DofJointMotors[m_data->m_numMotors]=c;
bool motorOn = true;
c->enableMotor(jointInfo->m_jointAxisIndex,motorOn);
c->setMaxMotorForce(jointInfo->m_jointAxisIndex,10000);
c->setTargetVelocity(jointInfo->m_jointAxisIndex,0);
m_data->m_numMotors++;
}
}
}
}
}
}
//the btMultiBody support is work-in-progress :-)
for (int i=0;i<m_dynamicsWorld->getNumMultiBodyConstraints();i++)
{
m_dynamicsWorld->getMultiBodyConstraint(i)->finalizeMultiDof();
}
bool createGround=true;
if (createGround)
{
btVector3 groundHalfExtents(20,20,20);
groundHalfExtents[m_upAxis]=1.f;
btBoxShape* box = new btBoxShape(groundHalfExtents);
m_collisionShapes.push_back(box);
box->initializePolyhedralFeatures();
m_guiHelper->createCollisionShapeGraphicsObject(box);
btTransform start; start.setIdentity();
btVector3 groundOrigin(0,0,0);
groundOrigin[m_upAxis]=-2.5;
start.setOrigin(groundOrigin);
btRigidBody* body = createRigidBody(0,start,box);
//m_dynamicsWorld->removeRigidBody(body);
// m_dynamicsWorld->addRigidBody(body,2,1);
btVector3 color(0.5,0.5,0.5);
m_guiHelper->createRigidBodyGraphicsObject(body,color);
}
}
#ifdef TEST_MULTIBODY_SERIALIZATION
m_dynamicsWorld->serialize(s);
b3ResourcePath p;
char resourcePath[1024];
if (p.findResourcePath("r2d2_multibody.bullet",resourcePath,1024))
{
FILE* f = fopen(resourcePath,"wb");
fwrite(s->getBufferPointer(),s->getCurrentBufferSize(),1,f);
fclose(f);
}
#endif//TEST_MULTIBODY_SERIALIZATION
}
void TestJointTorqueSetup::initPhysics()
{
int upAxis = 1;
gJointFeedbackInWorldSpace = true;
gJointFeedbackInJointFrame = true;
m_guiHelper->setUpAxis(upAxis);
btVector4 colors[4] =
{
btVector4(1,0,0,1),
btVector4(0,1,0,1),
btVector4(0,1,1,1),
btVector4(1,1,0,1),
};
int curColor = 0;
this->createEmptyDynamicsWorld();
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
m_dynamicsWorld->getDebugDrawer()->setDebugMode(
//btIDebugDraw::DBG_DrawConstraints
+btIDebugDraw::DBG_DrawWireframe
+btIDebugDraw::DBG_DrawContactPoints
+btIDebugDraw::DBG_DrawAabb
);//+btIDebugDraw::DBG_DrawConstraintLimits);
//create a static ground object
if (1)
{
btVector3 groundHalfExtents(1,1,0.2);
groundHalfExtents[upAxis]=1.f;
btBoxShape* box = new btBoxShape(groundHalfExtents);
box->initializePolyhedralFeatures();
m_guiHelper->createCollisionShapeGraphicsObject(box);
btTransform start; start.setIdentity();
btVector3 groundOrigin(-0.4f, 3.f, 0.f);
groundOrigin[upAxis] -=.5;
groundOrigin[2]-=0.6;
start.setOrigin(groundOrigin);
btQuaternion groundOrn(btVector3(0,1,0),0.25*SIMD_PI);
// start.setRotation(groundOrn);
btRigidBody* body = createRigidBody(0,start,box);
body->setFriction(0);
btVector4 color = colors[curColor];
curColor++;
curColor&=3;
m_guiHelper->createRigidBodyGraphicsObject(body,color);
}
{
bool floating = false;
bool damping = false;
bool gyro = false;
int numLinks = 2;
bool spherical = false; //set it ot false -to use 1DoF hinges instead of 3DoF sphericals
bool canSleep = false;
bool selfCollide = false;
btVector3 linkHalfExtents(0.05, 0.37, 0.1);
btVector3 baseHalfExtents(0.05, 0.37, 0.1);
btVector3 basePosition = btVector3(-0.4f, 3.f, 0.f);
//mbC->forceMultiDof(); //if !spherical, you can comment this line to check the 1DoF algorithm
//init the base
btVector3 baseInertiaDiag(0.f, 0.f, 0.f);
float baseMass = 1.f;
if(baseMass)
{
//btCollisionShape *shape = new btSphereShape(baseHalfExtents[0]);// btBoxShape(btVector3(baseHalfExtents[0], baseHalfExtents[1], baseHalfExtents[2]));
btCollisionShape *shape = new btBoxShape(btVector3(baseHalfExtents[0], baseHalfExtents[1], baseHalfExtents[2]));
shape->calculateLocalInertia(baseMass, baseInertiaDiag);
delete shape;
}
bool isMultiDof = true;
btMultiBody *pMultiBody = new btMultiBody(numLinks, baseMass, baseInertiaDiag, !floating, canSleep, isMultiDof);
m_multiBody = pMultiBody;
btQuaternion baseOriQuat(0.f, 0.f, 0.f, 1.f);
// baseOriQuat.setEulerZYX(-.25*SIMD_PI,0,-1.75*SIMD_PI);
pMultiBody->setBasePos(basePosition);
pMultiBody->setWorldToBaseRot(baseOriQuat);
btVector3 vel(0, 0, 0);
// pMultiBody->setBaseVel(vel);
//init the links
btVector3 hingeJointAxis(1, 0, 0);
//y-axis assumed up
btVector3 parentComToCurrentCom(0, -linkHalfExtents[1] * 2.f, 0); //par body's COM to cur body's COM offset
btVector3 currentPivotToCurrentCom(0, -linkHalfExtents[1], 0); //cur body's COM to cur body's PIV offset
btVector3 parentComToCurrentPivot = parentComToCurrentCom - currentPivotToCurrentCom; //par body's COM to cur body's PIV offset
//////
btScalar q0 = 0.f * SIMD_PI/ 180.f;
btQuaternion quat0(btVector3(0, 1, 0).normalized(), q0);
quat0.normalize();
/////
for(int i = 0; i < numLinks; ++i)
{
float linkMass = 1.f;
//if (i==3 || i==2)
// linkMass= 1000;
btVector3 linkInertiaDiag(0.f, 0.f, 0.f);
btCollisionShape* shape = 0;
if (i==0)
{
shape = new btBoxShape(btVector3(linkHalfExtents[0], linkHalfExtents[1], linkHalfExtents[2]));//
} else
{
shape = new btSphereShape(radius);
}
shape->calculateLocalInertia(linkMass, linkInertiaDiag);
delete shape;
if(!spherical)
{
//pMultiBody->setupRevolute(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f), hingeJointAxis, parentComToCurrentPivot, currentPivotToCurrentCom, false);
if (i==0)
{
pMultiBody->setupRevolute(i, linkMass, linkInertiaDiag, i - 1,
btQuaternion(0.f, 0.f, 0.f, 1.f),
hingeJointAxis,
parentComToCurrentPivot,
currentPivotToCurrentCom, false);
} else
{
btVector3 parentComToCurrentCom(0, -radius * 2.f, 0); //par body's COM to cur body's COM offset
btVector3 currentPivotToCurrentCom(0, -radius, 0); //cur body's COM to cur body's PIV offset
btVector3 parentComToCurrentPivot = parentComToCurrentCom - currentPivotToCurrentCom; //par body's COM to cur body's PIV offset
pMultiBody->setupFixed(i, linkMass, linkInertiaDiag, i - 1,
btQuaternion(0.f, 0.f, 0.f, 1.f),
parentComToCurrentPivot,
currentPivotToCurrentCom, false);
}
//pMultiBody->setupFixed(i,linkMass,linkInertiaDiag,i-1,btQuaternion(0,0,0,1),parentComToCurrentPivot,currentPivotToCurrentCom,false);
}
else
{
//pMultiBody->setupPlanar(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f)/*quat0*/, btVector3(1, 0, 0), parentComToCurrentPivot*2, false);
pMultiBody->setupSpherical(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f), parentComToCurrentPivot, currentPivotToCurrentCom, false);
}
}
pMultiBody->finalizeMultiDof();
//for (int i=pMultiBody->getNumLinks()-1;i>=0;i--)//
for (int i=0;i<pMultiBody->getNumLinks();i++)
{
btMultiBodyJointFeedback* fb = new btMultiBodyJointFeedback();
pMultiBody->getLink(i).m_jointFeedback = fb;
m_jointFeedbacks.push_back(fb);
//break;
}
btMultiBodyDynamicsWorld* world = m_dynamicsWorld;
///
world->addMultiBody(pMultiBody);
btMultiBody* mbC = pMultiBody;
mbC->setCanSleep(canSleep);
mbC->setHasSelfCollision(selfCollide);
mbC->setUseGyroTerm(gyro);
//
if(!damping)
{
mbC->setLinearDamping(0.f);
mbC->setAngularDamping(0.f);
}else
{ mbC->setLinearDamping(0.1f);
mbC->setAngularDamping(0.9f);
}
//
m_dynamicsWorld->setGravity(btVector3(0,0,-10));
//////////////////////////////////////////////
if(0)//numLinks > 0)
{
btScalar q0 = 45.f * SIMD_PI/ 180.f;
if(!spherical)
if(mbC->isMultiDof())
mbC->setJointPosMultiDof(0, &q0);
else
mbC->setJointPos(0, q0);
else
{
btQuaternion quat0(btVector3(1, 1, 0).normalized(), q0);
quat0.normalize();
mbC->setJointPosMultiDof(0, quat0);
}
}
///
btAlignedObjectArray<btQuaternion> world_to_local;
world_to_local.resize(pMultiBody->getNumLinks() + 1);
btAlignedObjectArray<btVector3> local_origin;
local_origin.resize(pMultiBody->getNumLinks() + 1);
world_to_local[0] = pMultiBody->getWorldToBaseRot();
local_origin[0] = pMultiBody->getBasePos();
// double friction = 1;
{
// float pos[4]={local_origin[0].x(),local_origin[0].y(),local_origin[0].z(),1};
// btScalar quat[4]={-world_to_local[0].x(),-world_to_local[0].y(),-world_to_local[0].z(),world_to_local[0].w()};
if (1)
{
btCollisionShape* shape = new btBoxShape(btVector3(baseHalfExtents[0],baseHalfExtents[1],baseHalfExtents[2]));//new btSphereShape(baseHalfExtents[0]);
m_guiHelper->createCollisionShapeGraphicsObject(shape);
btMultiBodyLinkCollider* col= new btMultiBodyLinkCollider(pMultiBody, -1);
col->setCollisionShape(shape);
btTransform tr;
tr.setIdentity();
//if we don't set the initial pose of the btCollisionObject, the simulator will do this
//when syncing the btMultiBody link transforms to the btMultiBodyLinkCollider
tr.setOrigin(local_origin[0]);
btQuaternion orn(btVector3(0,0,1),0.25*3.1415926538);
tr.setRotation(orn);
col->setWorldTransform(tr);
bool isDynamic = (baseMass > 0 && floating);
short collisionFilterGroup = isDynamic? short(btBroadphaseProxy::DefaultFilter) : short(btBroadphaseProxy::StaticFilter);
short collisionFilterMask = isDynamic? short(btBroadphaseProxy::AllFilter) : short(btBroadphaseProxy::AllFilter ^ btBroadphaseProxy::StaticFilter);
world->addCollisionObject(col,collisionFilterGroup,collisionFilterMask);//, 2,1+2);
btVector3 color(0.0,0.0,0.5);
m_guiHelper->createCollisionObjectGraphicsObject(col,color);
// col->setFriction(friction);
pMultiBody->setBaseCollider(col);
}
}
for (int i=0; i < pMultiBody->getNumLinks(); ++i)
{
const int parent = pMultiBody->getParent(i);
world_to_local[i+1] = pMultiBody->getParentToLocalRot(i) * world_to_local[parent+1];
local_origin[i+1] = local_origin[parent+1] + (quatRotate(world_to_local[i+1].inverse() , pMultiBody->getRVector(i)));
}
for (int i=0; i < pMultiBody->getNumLinks(); ++i)
{
btVector3 posr = local_origin[i+1];
// float pos[4]={posr.x(),posr.y(),posr.z(),1};
btScalar quat[4]={-world_to_local[i+1].x(),-world_to_local[i+1].y(),-world_to_local[i+1].z(),world_to_local[i+1].w()};
btCollisionShape* shape =0;
if (i==0)
{
shape = new btBoxShape(btVector3(linkHalfExtents[0],linkHalfExtents[1],linkHalfExtents[2]));//btSphereShape(linkHalfExtents[0]);
} else
{
shape = new btSphereShape(radius);
}
m_guiHelper->createCollisionShapeGraphicsObject(shape);
btMultiBodyLinkCollider* col = new btMultiBodyLinkCollider(pMultiBody, i);
col->setCollisionShape(shape);
btTransform tr;
tr.setIdentity();
tr.setOrigin(posr);
tr.setRotation(btQuaternion(quat[0],quat[1],quat[2],quat[3]));
col->setWorldTransform(tr);
// col->setFriction(friction);
bool isDynamic = 1;//(linkMass > 0);
short collisionFilterGroup = isDynamic? short(btBroadphaseProxy::DefaultFilter) : short(btBroadphaseProxy::StaticFilter);
short collisionFilterMask = isDynamic? short(btBroadphaseProxy::AllFilter) : short(btBroadphaseProxy::AllFilter ^ btBroadphaseProxy::StaticFilter);
//if (i==0||i>numLinks-2)
{
world->addCollisionObject(col,collisionFilterGroup,collisionFilterMask);//,2,1+2);
btVector4 color = colors[curColor];
curColor++;
curColor&=3;
m_guiHelper->createCollisionObjectGraphicsObject(col,color);
pMultiBody->getLink(i).m_collider=col;
}
}
}
btSerializer* s = new btDefaultSerializer;
m_dynamicsWorld->serialize(s);
b3ResourcePath p;
char resourcePath[1024];
if (p.findResourcePath("multibody.bullet",resourcePath,1024))
{
FILE* f = fopen(resourcePath,"wb");
fwrite(s->getBufferPointer(),s->getCurrentBufferSize(),1,f);
fclose(f);
}
}
void ImportSDFSetup::initPhysics()
{
int upAxis = 2;
m_guiHelper->setUpAxis(upAxis);
this->createEmptyDynamicsWorld();
//m_dynamicsWorld->getSolverInfo().m_numIterations = 100;
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
m_dynamicsWorld->getDebugDrawer()->setDebugMode(
btIDebugDraw::DBG_DrawConstraints
+btIDebugDraw::DBG_DrawContactPoints
+btIDebugDraw::DBG_DrawAabb
);//+btIDebugDraw::DBG_DrawConstraintLimits);
btVector3 gravity(0,0,0);
gravity[upAxis]=-9.8;
m_dynamicsWorld->setGravity(gravity);
BulletURDFImporter u2b(m_guiHelper);
bool loadOk = u2b.loadSDF(m_fileName);
if (loadOk)
{
//printTree(u2b,u2b.getRootLinkIndex());
//u2b.printTree();
btTransform identityTrans;
identityTrans.setIdentity();
for (int m =0; m<u2b.getNumModels();m++)
{
u2b.activateModel(m);
btMultiBody* mb = 0;
//todo: move these internal API called inside the 'ConvertURDF2Bullet' call, hidden from the user
int rootLinkIndex = u2b.getRootLinkIndex();
b3Printf("urdf root link index = %d\n",rootLinkIndex);
MyMultiBodyCreator creation(m_guiHelper);
ConvertURDF2Bullet(u2b,creation, identityTrans,m_dynamicsWorld,m_useMultiBody,u2b.getPathPrefix());
mb = creation.getBulletMultiBody();
}
for (int i=0;i<m_dynamicsWorld->getNumMultiBodyConstraints();i++)
{
m_dynamicsWorld->getMultiBodyConstraint(i)->finalizeMultiDof();
}
bool createGround=true;
if (createGround)
{
btVector3 groundHalfExtents(20,20,20);
groundHalfExtents[upAxis]=1.f;
btBoxShape* box = new btBoxShape(groundHalfExtents);
box->initializePolyhedralFeatures();
m_guiHelper->createCollisionShapeGraphicsObject(box);
btTransform start; start.setIdentity();
btVector3 groundOrigin(0,0,0);
groundOrigin[upAxis]=-2.5;
start.setOrigin(groundOrigin);
btRigidBody* body = createRigidBody(0,start,box);
//m_dynamicsWorld->removeRigidBody(body);
// m_dynamicsWorld->addRigidBody(body,2,1);
btVector3 color(0.5,0.5,0.5);
m_guiHelper->createRigidBodyGraphicsObject(body,color);
}
///this extra stepSimulation call makes sure that all the btMultibody transforms are properly propagates.
m_dynamicsWorld->stepSimulation(1. / 240., 0);// 1., 10, 1. / 240.);
}
}
void MultiDofDemo::initPhysics()
{
m_guiHelper->setUpAxis(1);
if(g_firstInit)
{
m_guiHelper->getRenderInterface()->getActiveCamera()->setCameraDistance(btScalar(10.*scaling));
m_guiHelper->getRenderInterface()->getActiveCamera()->setCameraPitch(50);
g_firstInit = false;
}
///collision configuration contains default setup for memory, collision setup
m_collisionConfiguration = new btDefaultCollisionConfiguration();
///use the default collision dispatcher. For parallel processing you can use a diffent dispatcher (see Extras/BulletMultiThreaded)
m_dispatcher = new btCollisionDispatcher(m_collisionConfiguration);
m_broadphase = new btDbvtBroadphase();
//Use the btMultiBodyConstraintSolver for Featherstone btMultiBody support
btMultiBodyConstraintSolver* sol = new btMultiBodyConstraintSolver;
m_solver = sol;
//use btMultiBodyDynamicsWorld for Featherstone btMultiBody support
btMultiBodyDynamicsWorld* world = new btMultiBodyDynamicsWorld(m_dispatcher,m_broadphase,sol,m_collisionConfiguration);
m_dynamicsWorld = world;
// m_dynamicsWorld->setDebugDrawer(&gDebugDraw);
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
m_dynamicsWorld->setGravity(btVector3(0,-10,0));
///create a few basic rigid bodies
btVector3 groundHalfExtents(50,50,50);
btCollisionShape* groundShape = new btBoxShape(groundHalfExtents);
//groundShape->initializePolyhedralFeatures();
// btCollisionShape* groundShape = new btStaticPlaneShape(btVector3(0,1,0),50);
m_collisionShapes.push_back(groundShape);
btTransform groundTransform;
groundTransform.setIdentity();
groundTransform.setOrigin(btVector3(0,-50,00));
/////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////
bool damping = true;
bool gyro = true;
int numLinks = 5;
bool spherical = true; //set it ot false -to use 1DoF hinges instead of 3DoF sphericals
bool multibodyOnly = false;
bool canSleep = true;
bool selfCollide = true;
bool multibodyConstraint = false;
btVector3 linkHalfExtents(0.05, 0.37, 0.1);
btVector3 baseHalfExtents(0.05, 0.37, 0.1);
btMultiBody* mbC = createFeatherstoneMultiBody_testMultiDof(world, numLinks, btVector3(-0.4f, 3.f, 0.f), linkHalfExtents, baseHalfExtents, spherical, g_floatingBase);
//mbC->forceMultiDof(); //if !spherical, you can comment this line to check the 1DoF algorithm
g_floatingBase = ! g_floatingBase;
mbC->setCanSleep(canSleep);
mbC->setHasSelfCollision(selfCollide);
mbC->setUseGyroTerm(gyro);
//
if(!damping)
{
mbC->setLinearDamping(0.f);
mbC->setAngularDamping(0.f);
}else
{ mbC->setLinearDamping(0.1f);
mbC->setAngularDamping(0.9f);
}
//
m_dynamicsWorld->setGravity(btVector3(0, -9.81 ,0));
//m_dynamicsWorld->getSolverInfo().m_numIterations = 100;
//////////////////////////////////////////////
if(numLinks > 0)
{
btScalar q0 = 45.f * SIMD_PI/ 180.f;
if(!spherical)
{
mbC->setJointPosMultiDof(0, &q0);
}
else
{
btQuaternion quat0(btVector3(1, 1, 0).normalized(), q0);
quat0.normalize();
mbC->setJointPosMultiDof(0, quat0);
}
}
///
addColliders_testMultiDof(mbC, world, baseHalfExtents, linkHalfExtents);
/////////////////////////////////////////////////////////////////
btScalar groundHeight = -51.55;
if (!multibodyOnly)
{
btScalar mass(0.);
//rigidbody is dynamic if and only if mass is non zero, otherwise static
bool isDynamic = (mass != 0.f);
btVector3 localInertia(0,0,0);
if (isDynamic)
groundShape->calculateLocalInertia(mass,localInertia);
//using motionstate is recommended, it provides interpolation capabilities, and only synchronizes 'active' objects
groundTransform.setIdentity();
groundTransform.setOrigin(btVector3(0,groundHeight,0));
btDefaultMotionState* myMotionState = new btDefaultMotionState(groundTransform);
btRigidBody::btRigidBodyConstructionInfo rbInfo(mass,myMotionState,groundShape,localInertia);
btRigidBody* body = new btRigidBody(rbInfo);
//add the body to the dynamics world
m_dynamicsWorld->addRigidBody(body,1,1+2);//,1,1+2);
}
/////////////////////////////////////////////////////////////////
if(!multibodyOnly)
{
btVector3 halfExtents(.5,.5,.5);
btBoxShape* colShape = new btBoxShape(halfExtents);
//btCollisionShape* colShape = new btSphereShape(btScalar(1.));
m_collisionShapes.push_back(colShape);
/// Create Dynamic Objects
btTransform startTransform;
startTransform.setIdentity();
btScalar mass(1.f);
//rigidbody is dynamic if and only if mass is non zero, otherwise static
bool isDynamic = (mass != 0.f);
btVector3 localInertia(0,0,0);
if (isDynamic)
colShape->calculateLocalInertia(mass,localInertia);
startTransform.setOrigin(btVector3(
btScalar(0.0),
0.0,
btScalar(0.0)));
//using motionstate is recommended, it provides interpolation capabilities, and only synchronizes 'active' objects
btDefaultMotionState* myMotionState = new btDefaultMotionState(startTransform);
btRigidBody::btRigidBodyConstructionInfo rbInfo(mass,myMotionState,colShape,localInertia);
btRigidBody* body = new btRigidBody(rbInfo);
m_dynamicsWorld->addRigidBody(body);//,1,1+2);
if (multibodyConstraint) {
btVector3 pointInA = -linkHalfExtents;
// btVector3 pointInB = halfExtents;
btMatrix3x3 frameInA;
btMatrix3x3 frameInB;
frameInA.setIdentity();
frameInB.setIdentity();
btVector3 jointAxis(1.0,0.0,0.0);
//btMultiBodySliderConstraint* p2p = new btMultiBodySliderConstraint(mbC,numLinks-1,body,pointInA,pointInB,frameInA,frameInB,jointAxis);
btMultiBodyFixedConstraint* p2p = new btMultiBodyFixedConstraint(mbC,numLinks-1,mbC,numLinks-4,pointInA,pointInA,frameInA,frameInB);
p2p->setMaxAppliedImpulse(2.0);
m_dynamicsWorld->addMultiBodyConstraint(p2p);
}
}
m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
/////////////////////////////////////////////////////////////////
}
void ImportSDFSetup::initPhysics()
{
int upAxis = 2;
m_guiHelper->setUpAxis(upAxis);
this->createEmptyDynamicsWorld();
//m_dynamicsWorld->getSolverInfo().m_numIterations = 100;
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
m_dynamicsWorld->getDebugDrawer()->setDebugMode(
btIDebugDraw::DBG_DrawConstraints + btIDebugDraw::DBG_DrawContactPoints + btIDebugDraw::DBG_DrawAabb); //+btIDebugDraw::DBG_DrawConstraintLimits);
btVector3 gravity(0, 0, 0);
gravity[upAxis] = -9.8;
m_dynamicsWorld->setGravity(gravity);
BulletURDFImporter u2b(m_guiHelper, 0, 0, 1, 0);
bool loadOk = u2b.loadSDF(m_fileName);
if (loadOk)
{
//printTree(u2b,u2b.getRootLinkIndex());
//u2b.printTree();
btTransform rootTrans;
rootTrans.setIdentity();
for (int m = 0; m < u2b.getNumModels(); m++)
{
u2b.activateModel(m);
btMultiBody* mb = 0;
//todo: move these internal API called inside the 'ConvertURDF2Bullet' call, hidden from the user
//int rootLinkIndex = u2b.getRootLinkIndex();
//b3Printf("urdf root link index = %d\n",rootLinkIndex);
MyMultiBodyCreator creation(m_guiHelper);
u2b.getRootTransformInWorld(rootTrans);
ConvertURDF2Bullet(u2b, creation, rootTrans, m_dynamicsWorld, m_useMultiBody, u2b.getPathPrefix(), CUF_USE_SDF);
mb = creation.getBulletMultiBody();
if (m_useMultiBody && mb)
{
std::string* name = new std::string(u2b.getLinkName(u2b.getRootLinkIndex()));
m_nameMemory.push_back(name);
#ifdef TEST_MULTIBODY_SERIALIZATION
s->registerNameForPointer(name->c_str(), name->c_str());
#endif //TEST_MULTIBODY_SERIALIZATION
mb->setBaseName(name->c_str());
//create motors for each btMultiBody joint
int numLinks = mb->getNumLinks();
for (int i = 0; i < numLinks; i++)
{
int mbLinkIndex = i;
int urdfLinkIndex = creation.m_mb2urdfLink[mbLinkIndex];
std::string* jointName = new std::string(u2b.getJointName(urdfLinkIndex));
std::string* linkName = new std::string(u2b.getLinkName(urdfLinkIndex).c_str());
#ifdef TEST_MULTIBODY_SERIALIZATION
s->registerNameForPointer(jointName->c_str(), jointName->c_str());
s->registerNameForPointer(linkName->c_str(), linkName->c_str());
#endif //TEST_MULTIBODY_SERIALIZATION
m_nameMemory.push_back(jointName);
m_nameMemory.push_back(linkName);
mb->getLink(i).m_linkName = linkName->c_str();
mb->getLink(i).m_jointName = jointName->c_str();
if (mb->getLink(mbLinkIndex).m_jointType == btMultibodyLink::eRevolute || mb->getLink(mbLinkIndex).m_jointType == btMultibodyLink::ePrismatic)
{
if (m_data->m_numMotors < MAX_NUM_MOTORS)
{
char motorName[1024];
sprintf(motorName, "%s q'", jointName->c_str());
btScalar* motorVel = &m_data->m_motorTargetVelocities[m_data->m_numMotors];
*motorVel = 0.f;
SliderParams slider(motorName, motorVel);
slider.m_minVal = -4;
slider.m_maxVal = 4;
m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
float maxMotorImpulse = 10.1f;
btMultiBodyJointMotor* motor = new btMultiBodyJointMotor(mb, mbLinkIndex, 0, 0, maxMotorImpulse);
//motor->setMaxAppliedImpulse(0);
m_data->m_jointMotors[m_data->m_numMotors] = motor;
m_dynamicsWorld->addMultiBodyConstraint(motor);
m_data->m_numMotors++;
}
}
}
}
}
for (int i = 0; i < m_dynamicsWorld->getNumMultiBodyConstraints(); i++)
{
m_dynamicsWorld->getMultiBodyConstraint(i)->finalizeMultiDof();
}
bool createGround = true;
if (createGround)
{
btVector3 groundHalfExtents(20, 20, 20);
groundHalfExtents[upAxis] = 1.f;
btBoxShape* box = new btBoxShape(groundHalfExtents);
box->initializePolyhedralFeatures();
m_guiHelper->createCollisionShapeGraphicsObject(box);
btTransform start;
start.setIdentity();
btVector3 groundOrigin(0, 0, 0);
groundOrigin[upAxis] = -2.5;
start.setOrigin(groundOrigin);
btRigidBody* body = createRigidBody(0, start, box);
//m_dynamicsWorld->removeRigidBody(body);
// m_dynamicsWorld->addRigidBody(body,2,1);
btVector3 color(0.5, 0.5, 0.5);
m_guiHelper->createRigidBodyGraphicsObject(body, color);
}
///this extra stepSimulation call makes sure that all the btMultibody transforms are properly propagates.
m_dynamicsWorld->stepSimulation(1. / 240., 0); // 1., 10, 1. / 240.);
}
}
void MultiBodySoftContact::initPhysics()
{
int upAxis = 2;
m_guiHelper->setUpAxis(upAxis);
btVector4 colors[4] =
{
btVector4(1,0,0,1),
btVector4(0,1,0,1),
btVector4(0,1,1,1),
btVector4(1,1,0,1),
};
int curColor = 0;
this->createEmptyDynamicsWorld();
m_dynamicsWorld->setGravity(btVector3(0,0,-10));
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
m_dynamicsWorld->getDebugDrawer()->setDebugMode(
//btIDebugDraw::DBG_DrawConstraints
+btIDebugDraw::DBG_DrawWireframe
+btIDebugDraw::DBG_DrawContactPoints
+btIDebugDraw::DBG_DrawAabb
);//+btIDebugDraw::DBG_DrawConstraintLimits);
//create a static ground object
if (1)
{
btVector3 groundHalfExtents(50,50,50);
btBoxShape* box = new btBoxShape(groundHalfExtents);
box->initializePolyhedralFeatures();
m_guiHelper->createCollisionShapeGraphicsObject(box);
btTransform start; start.setIdentity();
btVector3 groundOrigin(0,0,-50.5);
start.setOrigin(groundOrigin);
// start.setRotation(groundOrn);
btRigidBody* body = createRigidBody(0,start,box);
//setContactStiffnessAndDamping will enable compliant rigid body contact
body->setContactStiffnessAndDamping(300,10);
btVector4 color = colors[curColor];
curColor++;
curColor&=3;
m_guiHelper->createRigidBodyGraphicsObject(body,color);
}
{
btCollisionShape* childShape = new btSphereShape(btScalar(0.5));
m_guiHelper->createCollisionShapeGraphicsObject(childShape);
btScalar mass = 1;
btVector3 baseInertiaDiag;
bool isFixed = (mass == 0);
childShape->calculateLocalInertia(mass,baseInertiaDiag);
btMultiBody *pMultiBody = new btMultiBody(0, 1, baseInertiaDiag, false, false);
btTransform startTrans;
startTrans.setIdentity();
startTrans.setOrigin(btVector3(0,0,3));
pMultiBody->setBaseWorldTransform(startTrans);
btMultiBodyLinkCollider* col= new btMultiBodyLinkCollider(pMultiBody, -1);
col->setCollisionShape(childShape);
pMultiBody->setBaseCollider(col);
bool isDynamic = (mass > 0 && !isFixed);
int collisionFilterGroup = isDynamic? int(btBroadphaseProxy::DefaultFilter) : int(btBroadphaseProxy::StaticFilter);
int collisionFilterMask = isDynamic? int(btBroadphaseProxy::AllFilter) : int(btBroadphaseProxy::AllFilter ^ btBroadphaseProxy::StaticFilter);
m_dynamicsWorld->addCollisionObject(col,collisionFilterGroup,collisionFilterMask);//, 2,1+2);
pMultiBody->finalizeMultiDof();
m_dynamicsWorld->addMultiBody(pMultiBody);
btAlignedObjectArray<btQuaternion> scratch_q;
btAlignedObjectArray<btVector3> scratch_m;
pMultiBody->forwardKinematics(scratch_q,scratch_m);
btAlignedObjectArray<btQuaternion> world_to_local;
btAlignedObjectArray<btVector3> local_origin;
pMultiBody->updateCollisionObjectWorldTransforms(world_to_local,local_origin);
}
m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
}
void TestJointTorqueSetup::initPhysics()
{
int upAxis = 2;
m_guiHelper->setUpAxis(upAxis);
btVector4 colors[4] =
{
btVector4(1,0,0,1),
btVector4(0,1,0,1),
btVector4(0,1,1,1),
btVector4(1,1,0,1),
};
int curColor = 0;
this->createEmptyDynamicsWorld();
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
m_dynamicsWorld->getDebugDrawer()->setDebugMode(
//btIDebugDraw::DBG_DrawConstraints
+btIDebugDraw::DBG_DrawWireframe
+btIDebugDraw::DBG_DrawContactPoints
+btIDebugDraw::DBG_DrawAabb
);//+btIDebugDraw::DBG_DrawConstraintLimits);
//create a static ground object
if (0)
{
btVector3 groundHalfExtents(20,20,20);
groundHalfExtents[upAxis]=1.f;
btBoxShape* box = new btBoxShape(groundHalfExtents);
box->initializePolyhedralFeatures();
m_guiHelper->createCollisionShapeGraphicsObject(box);
btTransform start; start.setIdentity();
btVector3 groundOrigin(0,0,0);
groundOrigin[upAxis]=-1.5;
start.setOrigin(groundOrigin);
btRigidBody* body = createRigidBody(0,start,box);
btVector4 color = colors[curColor];
curColor++;
curColor&=3;
m_guiHelper->createRigidBodyGraphicsObject(body,color);
}
{
bool floating = false;
bool damping = true;
bool gyro = true;
int numLinks = 5;
bool spherical = false; //set it ot false -to use 1DoF hinges instead of 3DoF sphericals
bool canSleep = false;
bool selfCollide = false;
btVector3 linkHalfExtents(0.05, 0.37, 0.1);
btVector3 baseHalfExtents(0.05, 0.37, 0.1);
btVector3 basePosition = btVector3(-0.4f, 3.f, 0.f);
//mbC->forceMultiDof(); //if !spherical, you can comment this line to check the 1DoF algorithm
//init the base
btVector3 baseInertiaDiag(0.f, 0.f, 0.f);
float baseMass = 1.f;
if(baseMass)
{
btCollisionShape *pTempBox = new btBoxShape(btVector3(baseHalfExtents[0], baseHalfExtents[1], baseHalfExtents[2]));
pTempBox->calculateLocalInertia(baseMass, baseInertiaDiag);
delete pTempBox;
}
bool isMultiDof = false;
btMultiBody *pMultiBody = new btMultiBody(numLinks, baseMass, baseInertiaDiag, !floating, canSleep, isMultiDof);
m_multiBody = pMultiBody;
btQuaternion baseOriQuat(0.f, 0.f, 0.f, 1.f);
pMultiBody->setBasePos(basePosition);
pMultiBody->setWorldToBaseRot(baseOriQuat);
btVector3 vel(0, 0, 0);
// pMultiBody->setBaseVel(vel);
//init the links
btVector3 hingeJointAxis(1, 0, 0);
float linkMass = 1.f;
btVector3 linkInertiaDiag(0.f, 0.f, 0.f);
btCollisionShape *pTempBox = new btBoxShape(btVector3(linkHalfExtents[0], linkHalfExtents[1], linkHalfExtents[2]));
pTempBox->calculateLocalInertia(linkMass, linkInertiaDiag);
delete pTempBox;
//y-axis assumed up
btVector3 parentComToCurrentCom(0, -linkHalfExtents[1] * 2.f, 0); //par body's COM to cur body's COM offset
btVector3 currentPivotToCurrentCom(0, -linkHalfExtents[1], 0); //cur body's COM to cur body's PIV offset
btVector3 parentComToCurrentPivot = parentComToCurrentCom - currentPivotToCurrentCom; //par body's COM to cur body's PIV offset
//////
btScalar q0 = 0.f * SIMD_PI/ 180.f;
btQuaternion quat0(btVector3(0, 1, 0).normalized(), q0);
quat0.normalize();
/////
for(int i = 0; i < numLinks; ++i)
{
if(!spherical)
pMultiBody->setupRevolute(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f), hingeJointAxis, parentComToCurrentPivot, currentPivotToCurrentCom, false);
else
//pMultiBody->setupPlanar(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f)/*quat0*/, btVector3(1, 0, 0), parentComToCurrentPivot*2, false);
pMultiBody->setupSpherical(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f), parentComToCurrentPivot, currentPivotToCurrentCom, false);
}
//pMultiBody->finalizeMultiDof();
btMultiBodyDynamicsWorld* world = m_dynamicsWorld;
///
world->addMultiBody(pMultiBody);
btMultiBody* mbC = pMultiBody;
mbC->setCanSleep(canSleep);
mbC->setHasSelfCollision(selfCollide);
mbC->setUseGyroTerm(gyro);
//
if(!damping)
{
mbC->setLinearDamping(0.f);
mbC->setAngularDamping(0.f);
}else
{ mbC->setLinearDamping(0.1f);
mbC->setAngularDamping(0.9f);
}
//
btVector3 gravity(0,0,0);
//gravity[upAxis] = -9.81;
m_dynamicsWorld->setGravity(gravity);
//////////////////////////////////////////////
if(numLinks > 0)
{
btScalar q0 = 45.f * SIMD_PI/ 180.f;
if(!spherical)
if(mbC->isMultiDof())
mbC->setJointPosMultiDof(0, &q0);
else
mbC->setJointPos(0, q0);
else
{
btQuaternion quat0(btVector3(1, 1, 0).normalized(), q0);
quat0.normalize();
mbC->setJointPosMultiDof(0, quat0);
}
}
///
btAlignedObjectArray<btQuaternion> world_to_local;
world_to_local.resize(pMultiBody->getNumLinks() + 1);
btAlignedObjectArray<btVector3> local_origin;
local_origin.resize(pMultiBody->getNumLinks() + 1);
world_to_local[0] = pMultiBody->getWorldToBaseRot();
local_origin[0] = pMultiBody->getBasePos();
double friction = 1;
{
// float pos[4]={local_origin[0].x(),local_origin[0].y(),local_origin[0].z(),1};
float quat[4]={-world_to_local[0].x(),-world_to_local[0].y(),-world_to_local[0].z(),world_to_local[0].w()};
if (1)
{
btCollisionShape* box = new btBoxShape(baseHalfExtents);
m_guiHelper->createCollisionShapeGraphicsObject(box);
btMultiBodyLinkCollider* col= new btMultiBodyLinkCollider(pMultiBody, -1);
col->setCollisionShape(box);
btTransform tr;
tr.setIdentity();
//if we don't set the initial pose of the btCollisionObject, the simulator will do this
//when syncing the btMultiBody link transforms to the btMultiBodyLinkCollider
tr.setOrigin(local_origin[0]);
tr.setRotation(btQuaternion(quat[0],quat[1],quat[2],quat[3]));
col->setWorldTransform(tr);
world->addCollisionObject(col, 2,1+2);
btVector3 color(0.0,0.0,0.5);
m_guiHelper->createCollisionObjectGraphicsObject(col,color);
col->setFriction(friction);
pMultiBody->setBaseCollider(col);
}
}
for (int i=0; i < pMultiBody->getNumLinks(); ++i)
{
const int parent = pMultiBody->getParent(i);
world_to_local[i+1] = pMultiBody->getParentToLocalRot(i) * world_to_local[parent+1];
local_origin[i+1] = local_origin[parent+1] + (quatRotate(world_to_local[i+1].inverse() , pMultiBody->getRVector(i)));
}
for (int i=0; i < pMultiBody->getNumLinks(); ++i)
{
btVector3 posr = local_origin[i+1];
// float pos[4]={posr.x(),posr.y(),posr.z(),1};
float quat[4]={-world_to_local[i+1].x(),-world_to_local[i+1].y(),-world_to_local[i+1].z(),world_to_local[i+1].w()};
btCollisionShape* box = new btBoxShape(linkHalfExtents);
m_guiHelper->createCollisionShapeGraphicsObject(box);
btMultiBodyLinkCollider* col = new btMultiBodyLinkCollider(pMultiBody, i);
col->setCollisionShape(box);
btTransform tr;
tr.setIdentity();
tr.setOrigin(posr);
tr.setRotation(btQuaternion(quat[0],quat[1],quat[2],quat[3]));
col->setWorldTransform(tr);
col->setFriction(friction);
world->addCollisionObject(col,2,1+2);
btVector4 color = colors[curColor];
curColor++;
curColor&=3;
m_guiHelper->createCollisionObjectGraphicsObject(col,color);
pMultiBody->getLink(i).m_collider=col;
}
}
}
void TestHingeTorque::initPhysics()
{
int upAxis = 1;
m_guiHelper->setUpAxis(upAxis);
createEmptyDynamicsWorld();
m_dynamicsWorld->getSolverInfo().m_splitImpulse = false;
m_dynamicsWorld->setGravity(btVector3(0,0,-10));
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
int mode = btIDebugDraw::DBG_DrawWireframe
+btIDebugDraw::DBG_DrawConstraints
+btIDebugDraw::DBG_DrawConstraintLimits;
m_dynamicsWorld->getDebugDrawer()->setDebugMode(mode);
{ // create a door using hinge constraint attached to the world
int numLinks = 2;
bool spherical = false; //set it ot false -to use 1DoF hinges instead of 3DoF sphericals
bool canSleep = false;
bool selfCollide = false;
btVector3 linkHalfExtents(0.05, 0.37, 0.1);
btVector3 baseHalfExtents(0.05, 0.37, 0.1);
btBoxShape* baseBox = new btBoxShape(baseHalfExtents);
btVector3 basePosition = btVector3(-0.4f, 3.f, 0.f);
btTransform baseWorldTrans;
baseWorldTrans.setIdentity();
baseWorldTrans.setOrigin(basePosition);
//mbC->forceMultiDof(); //if !spherical, you can comment this line to check the 1DoF algorithm
//init the base
btVector3 baseInertiaDiag(0.f, 0.f, 0.f);
float baseMass = 0.f;
float linkMass = 1.f;
btRigidBody* base = createRigidBody(baseMass,baseWorldTrans,baseBox);
m_dynamicsWorld->removeRigidBody(base);
base->setDamping(0,0);
m_dynamicsWorld->addRigidBody(base,collisionFilterGroup,collisionFilterMask);
btBoxShape* linkBox1 = new btBoxShape(linkHalfExtents);
btSphereShape* linkSphere = new btSphereShape(radius);
btRigidBody* prevBody = base;
for (int i=0;i<numLinks;i++)
{
btTransform linkTrans;
linkTrans = baseWorldTrans;
linkTrans.setOrigin(basePosition-btVector3(0,linkHalfExtents[1]*2.f*(i+1),0));
btCollisionShape* colOb = 0;
if (i==0)
{
colOb = linkBox1;
} else
{
colOb = linkSphere;
}
btRigidBody* linkBody = createRigidBody(linkMass,linkTrans,colOb);
m_dynamicsWorld->removeRigidBody(linkBody);
m_dynamicsWorld->addRigidBody(linkBody,collisionFilterGroup,collisionFilterMask);
linkBody->setDamping(0,0);
btTypedConstraint* con = 0;
if (i==0)
{
//create a hinge constraint
btVector3 pivotInA(0,-linkHalfExtents[1],0);
btVector3 pivotInB(0,linkHalfExtents[1],0);
btVector3 axisInA(1,0,0);
btVector3 axisInB(1,0,0);
bool useReferenceA = true;
btHingeConstraint* hinge = new btHingeConstraint(*prevBody,*linkBody,
pivotInA,pivotInB,
axisInA,axisInB,useReferenceA);
con = hinge;
} else
{
btTransform pivotInA(btQuaternion::getIdentity(),btVector3(0, -radius, 0)); //par body's COM to cur body's COM offset
btTransform pivotInB(btQuaternion::getIdentity(),btVector3(0, radius, 0)); //cur body's COM to cur body's PIV offset
btGeneric6DofSpring2Constraint* fixed = new btGeneric6DofSpring2Constraint(*prevBody, *linkBody,
pivotInA,pivotInB);
fixed->setLinearLowerLimit(btVector3(0,0,0));
fixed->setLinearUpperLimit(btVector3(0,0,0));
fixed->setAngularLowerLimit(btVector3(0,0,0));
fixed->setAngularUpperLimit(btVector3(0,0,0));
con = fixed;
}
btAssert(con);
if (con)
{
btJointFeedback* fb = new btJointFeedback();
m_jointFeedback.push_back(fb);
con->setJointFeedback(fb);
m_dynamicsWorld->addConstraint(con,true);
}
prevBody = linkBody;
}
}
if (1)
{
btVector3 groundHalfExtents(1,1,0.2);
groundHalfExtents[upAxis]=1.f;
btBoxShape* box = new btBoxShape(groundHalfExtents);
box->initializePolyhedralFeatures();
btTransform start; start.setIdentity();
btVector3 groundOrigin(-0.4f, 3.f, 0.f);
btVector3 basePosition = btVector3(-0.4f, 3.f, 0.f);
btQuaternion groundOrn(btVector3(0,1,0),0.25*SIMD_PI);
groundOrigin[upAxis] -=.5;
groundOrigin[2]-=0.6;
start.setOrigin(groundOrigin);
// start.setRotation(groundOrn);
btRigidBody* body = createRigidBody(0,start,box);
body->setFriction(0);
}
m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
}