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bullet3/examples/SharedMemory/PhysicsServer.cpp
= e05825f639 improvements to the shared memory physics API: 
support picking in C API etc.
2015-09-24 22:42:22 -07:00

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#include "PhysicsServer.h"
#include "PosixSharedMemory.h"
#include "Win32SharedMemory.h"
#include "../Importers/ImportURDFDemo/BulletUrdfImporter.h"
#include "../Importers/ImportURDFDemo/MyMultiBodyCreator.h"
#include "../Importers/ImportURDFDemo/URDF2Bullet.h"
#include "BulletDynamics/Featherstone/btMultiBodyDynamicsWorld.h"
#include "BulletDynamics/Featherstone/btMultiBodyConstraintSolver.h"
#include "BulletDynamics/Featherstone/btMultiBodyPoint2Point.h"
#include "BulletDynamics/Featherstone/btMultiBodyLinkCollider.h"
#include "BulletDynamics/Featherstone/btMultiBodyJointFeedback.h"
#include "../CommonInterfaces/CommonRenderInterface.h"
#include "btBulletDynamicsCommon.h"
#include "LinearMath/btTransform.h"
#include "../Extras/Serialize/BulletWorldImporter/btBulletWorldImporter.h"
#include "BulletDynamics/Featherstone/btMultiBodyJointMotor.h"
#include "LinearMath/btSerializer.h"
#include "Bullet3Common/b3Logging.h"
#include "../CommonInterfaces/CommonGUIHelperInterface.h"
#include "SharedMemoryBlock.h"
struct UrdfLinkNameMapUtil
{
btMultiBody* m_mb;
btDefaultSerializer* m_memSerializer;
UrdfLinkNameMapUtil():m_mb(0),m_memSerializer(0)
{
}
};
struct SharedMemoryDebugDrawer : public btIDebugDraw
{
int m_debugMode;
btAlignedObjectArray<SharedMemLines> m_lines2;
SharedMemoryDebugDrawer ()
:m_debugMode(0)
{
}
virtual void drawContactPoint(const btVector3& PointOnB,const btVector3& normalOnB,btScalar distance,int lifeTime,const btVector3& color)
{
}
virtual void reportErrorWarning(const char* warningString)
{
}
virtual void draw3dText(const btVector3& location,const char* textString)
{
}
virtual void setDebugMode(int debugMode)
{
m_debugMode = debugMode;
}
virtual int getDebugMode() const
{
return m_debugMode;
}
virtual void drawLine(const btVector3& from,const btVector3& to,const btVector3& color)
{
SharedMemLines line;
line.m_from = from;
line.m_to = to;
line.m_color = color;
m_lines2.push_back(line);
}
};
struct PhysicsServerInternalData
{
SharedMemoryInterface* m_sharedMemory;
SharedMemoryBlock* m_testBlock1;
bool m_isConnected;
btScalar m_physicsDeltaTime;
btAlignedObjectArray<btMultiBodyJointFeedback*> m_multiBodyJointFeedbacks;
btAlignedObjectArray<btBulletWorldImporter*> m_worldImporters;
btAlignedObjectArray<UrdfLinkNameMapUtil*> m_urdfLinkNameMapper;
btHashMap<btHashInt, btMultiBodyJointMotor*> m_multiBodyJointMotorMap;
btAlignedObjectArray<std::string*> m_strings;
btAlignedObjectArray<btCollisionShape*> m_collisionShapes;
btBroadphaseInterface* m_broadphase;
btCollisionDispatcher* m_dispatcher;
btMultiBodyConstraintSolver* m_solver;
btDefaultCollisionConfiguration* m_collisionConfiguration;
btMultiBodyDynamicsWorld* m_dynamicsWorld;
SharedMemoryDebugDrawer* m_debugDrawer;
btTransform m_rootLocalInertialFrame;
struct GUIHelperInterface* m_guiHelper;
int m_sharedMemoryKey;
bool m_verboseOutput;
//data for picking objects
class btRigidBody* m_pickedBody;
class btTypedConstraint* m_pickedConstraint;
class btMultiBodyPoint2Point* m_pickingMultiBodyPoint2Point;
btVector3 m_oldPickingPos;
btVector3 m_hitPos;
btScalar m_oldPickingDist;
bool m_prevCanSleep;
PhysicsServerInternalData()
:m_sharedMemory(0),
m_testBlock1(0),
m_isConnected(false),
m_physicsDeltaTime(1./240.),
m_dynamicsWorld(0),
m_debugDrawer(0),
m_guiHelper(0),
m_sharedMemoryKey(SHARED_MEMORY_KEY),
m_verboseOutput(false),
m_pickedBody(0),
m_pickedConstraint(0),
m_pickingMultiBodyPoint2Point(0)
{
m_rootLocalInertialFrame.setIdentity();
}
SharedMemoryStatus& createServerStatus(int statusType, int sequenceNumber, int timeStamp)
{
SharedMemoryStatus& serverCmd =m_testBlock1->m_serverCommands[0];
serverCmd .m_type = statusType;
serverCmd.m_sequenceNumber = sequenceNumber;
serverCmd.m_timeStamp = timeStamp;
return serverCmd;
}
void submitServerStatus(SharedMemoryStatus& status)
{
m_testBlock1->m_numServerCommands++;
}
};
PhysicsServerSharedMemory::PhysicsServerSharedMemory()
{
m_data = new PhysicsServerInternalData();
#ifdef _WIN32
m_data->m_sharedMemory = new Win32SharedMemoryServer();
#else
m_data->m_sharedMemory = new PosixSharedMemory();
#endif
createEmptyDynamicsWorld();
}
PhysicsServerSharedMemory::~PhysicsServerSharedMemory()
{
deleteDynamicsWorld();
delete m_data;
}
void PhysicsServerSharedMemory::setSharedMemoryKey(int key)
{
m_data->m_sharedMemoryKey = key;
}
void PhysicsServerSharedMemory::createEmptyDynamicsWorld()
{
///collision configuration contains default setup for memory, collision setup
m_data->m_collisionConfiguration = new btDefaultCollisionConfiguration();
//m_collisionConfiguration->setConvexConvexMultipointIterations();
///use the default collision dispatcher. For parallel processing you can use a diffent dispatcher (see Extras/BulletMultiThreaded)
m_data->m_dispatcher = new btCollisionDispatcher(m_data->m_collisionConfiguration);
m_data->m_broadphase = new btDbvtBroadphase();
m_data->m_solver = new btMultiBodyConstraintSolver;
m_data->m_dynamicsWorld = new btMultiBodyDynamicsWorld(m_data->m_dispatcher, m_data->m_broadphase, m_data->m_solver, m_data->m_collisionConfiguration);
m_data->m_debugDrawer = new SharedMemoryDebugDrawer();
m_data->m_dynamicsWorld->setDebugDrawer(m_data->m_debugDrawer);
m_data->m_dynamicsWorld->setGravity(btVector3(0, 0, 0));
}
void PhysicsServerSharedMemory::deleteDynamicsWorld()
{
for (int i=0;i<m_data->m_multiBodyJointFeedbacks.size();i++)
{
delete m_data->m_multiBodyJointFeedbacks[i];
}
m_data->m_multiBodyJointFeedbacks.clear();
for (int i=0;i<m_data->m_worldImporters.size();i++)
{
delete m_data->m_worldImporters[i];
}
m_data->m_worldImporters.clear();
for (int i=0;i<m_data->m_urdfLinkNameMapper.size();i++)
{
delete m_data->m_urdfLinkNameMapper[i];
}
m_data->m_urdfLinkNameMapper.clear();
m_data->m_multiBodyJointMotorMap.clear();
for (int i=0;i<m_data->m_strings.size();i++)
{
delete m_data->m_strings[i];
}
m_data->m_strings.clear();
if (m_data->m_dynamicsWorld)
{
int i;
for (i = m_data->m_dynamicsWorld->getNumConstraints() - 1; i >= 0; i--)
{
m_data->m_dynamicsWorld->removeConstraint(m_data->m_dynamicsWorld->getConstraint(i));
}
for (i = m_data->m_dynamicsWorld->getNumCollisionObjects() - 1; i >= 0; i--)
{
btCollisionObject* obj = m_data->m_dynamicsWorld->getCollisionObjectArray()[i];
btRigidBody* body = btRigidBody::upcast(obj);
if (body && body->getMotionState())
{
delete body->getMotionState();
}
m_data->m_dynamicsWorld->removeCollisionObject(obj);
delete obj;
}
}
//delete collision shapes
for (int j = 0; j<m_data->m_collisionShapes.size(); j++)
{
btCollisionShape* shape = m_data->m_collisionShapes[j];
delete shape;
}
m_data->m_collisionShapes.clear();
delete m_data->m_dynamicsWorld;
m_data->m_dynamicsWorld=0;
delete m_data->m_debugDrawer;
m_data->m_debugDrawer=0;
delete m_data->m_solver;
m_data->m_solver=0;
delete m_data->m_broadphase;
m_data->m_broadphase=0;
delete m_data->m_dispatcher;
m_data->m_dispatcher=0;
delete m_data->m_collisionConfiguration;
m_data->m_collisionConfiguration=0;
}
bool PhysicsServerSharedMemory::connectSharedMemory( struct GUIHelperInterface* guiHelper)
{
m_data->m_guiHelper = guiHelper;
bool allowCreation = true;
bool allowConnectToExistingSharedMemory = false;
if (m_data->m_isConnected)
{
b3Warning("connectSharedMemory, while already connected");
return m_data->m_isConnected;
}
m_data->m_testBlock1 = (SharedMemoryBlock*)m_data->m_sharedMemory->allocateSharedMemory(m_data->m_sharedMemoryKey, SHARED_MEMORY_SIZE,allowCreation);
if (m_data->m_testBlock1)
{
int magicId =m_data->m_testBlock1->m_magicId;
if (m_data->m_verboseOutput)
{
b3Printf("magicId = %d\n", magicId);
}
if (m_data->m_testBlock1->m_magicId !=SHARED_MEMORY_MAGIC_NUMBER)
{
InitSharedMemoryBlock(m_data->m_testBlock1);
if (m_data->m_verboseOutput)
{
b3Printf("Created and initialized shared memory block\n");
}
m_data->m_isConnected = true;
} else
{
b3Error("Server cannot connect to existing shared memory, disconnecting shared memory.\n");
m_data->m_sharedMemory->releaseSharedMemory(m_data->m_sharedMemoryKey, SHARED_MEMORY_SIZE);
m_data->m_testBlock1 = 0;
m_data->m_isConnected = false;
}
} else
{
b3Error("Cannot connect to shared memory");
m_data->m_isConnected = false;
}
return m_data->m_isConnected;
}
void PhysicsServerSharedMemory::disconnectSharedMemory(bool deInitializeSharedMemory)
{
if (m_data->m_verboseOutput)
{
b3Printf("releaseSharedMemory1\n");
}
if (m_data->m_testBlock1)
{
if (m_data->m_verboseOutput)
{
b3Printf("m_testBlock1\n");
}
if (deInitializeSharedMemory)
{
m_data->m_testBlock1->m_magicId = 0;
if (m_data->m_verboseOutput)
{
b3Printf("De-initialized shared memory, magic id = %d\n",m_data->m_testBlock1->m_magicId);
}
}
btAssert(m_data->m_sharedMemory);
m_data->m_sharedMemory->releaseSharedMemory(m_data->m_sharedMemoryKey, SHARED_MEMORY_SIZE);
}
if (m_data->m_sharedMemory)
{
if (m_data->m_verboseOutput)
{
b3Printf("m_sharedMemory\n");
}
delete m_data->m_sharedMemory;
m_data->m_sharedMemory = 0;
m_data->m_testBlock1 = 0;
}
}
void PhysicsServerSharedMemory::releaseSharedMemory()
{
if (m_data->m_verboseOutput)
{
b3Printf("releaseSharedMemory1\n");
}
if (m_data->m_testBlock1)
{
if (m_data->m_verboseOutput)
{
b3Printf("m_testBlock1\n");
}
m_data->m_testBlock1->m_magicId = 0;
if (m_data->m_verboseOutput)
{
b3Printf("magic id = %d\n",m_data->m_testBlock1->m_magicId);
}
btAssert(m_data->m_sharedMemory);
m_data->m_sharedMemory->releaseSharedMemory( m_data->m_sharedMemoryKey
, SHARED_MEMORY_SIZE);
}
if (m_data->m_sharedMemory)
{
if (m_data->m_verboseOutput)
{
b3Printf("m_sharedMemory\n");
}
delete m_data->m_sharedMemory;
m_data->m_sharedMemory = 0;
m_data->m_testBlock1 = 0;
}
}
bool PhysicsServerSharedMemory::supportsJointMotor(btMultiBody* mb, int mbLinkIndex)
{
bool canHaveMotor = (mb->getLink(mbLinkIndex).m_jointType==btMultibodyLink::eRevolute
||mb->getLink(mbLinkIndex).m_jointType==btMultibodyLink::ePrismatic);
return canHaveMotor;
}
//for testing, create joint motors for revolute and prismatic joints
void PhysicsServerSharedMemory::createJointMotors(btMultiBody* mb)
{
int numLinks = mb->getNumLinks();
for (int i=0;i<numLinks;i++)
{
int mbLinkIndex = i;
if (supportsJointMotor(mb,mbLinkIndex))
{
float maxMotorImpulse = 0.f;
int dof = 0;
btScalar desiredVelocity = 0.f;
btMultiBodyJointMotor* motor = new btMultiBodyJointMotor(mb,mbLinkIndex,dof,desiredVelocity,maxMotorImpulse);
//motor->setMaxAppliedImpulse(0);
m_data->m_multiBodyJointMotorMap.insert(mbLinkIndex,motor);
m_data->m_dynamicsWorld->addMultiBodyConstraint(motor);
}
}
}
bool PhysicsServerSharedMemory::loadUrdf(const char* fileName, const btVector3& pos, const btQuaternion& orn,
bool useMultiBody, bool useFixedBase)
{
btAssert(m_data->m_dynamicsWorld);
if (!m_data->m_dynamicsWorld)
{
b3Error("loadUrdf: No valid m_dynamicsWorld");
return false;
}
BulletURDFImporter u2b(m_data->m_guiHelper);
bool loadOk = u2b.loadURDF(fileName, useFixedBase);
if (loadOk)
{
{
btScalar mass = 0;
m_data->m_rootLocalInertialFrame.setIdentity();
btVector3 localInertiaDiagonal(0,0,0);
int urdfLinkIndex = u2b.getRootLinkIndex();
u2b.getMassAndInertia(urdfLinkIndex, mass,localInertiaDiagonal,m_data->m_rootLocalInertialFrame);
}
if (m_data->m_verboseOutput)
{
b3Printf("loaded %s OK!", fileName);
}
btTransform tr;
tr.setIdentity();
tr.setOrigin(pos);
tr.setRotation(orn);
//int rootLinkIndex = u2b.getRootLinkIndex();
// printf("urdf root link index = %d\n",rootLinkIndex);
MyMultiBodyCreator creation(m_data->m_guiHelper);
ConvertURDF2Bullet(u2b,creation, tr,m_data->m_dynamicsWorld,useMultiBody,u2b.getPathPrefix());
btMultiBody* mb = creation.getBulletMultiBody();
if (useMultiBody)
{
if (mb)
{
createJointMotors(mb);
//serialize the btMultiBody and send the data to the client. This is one way to get the link/joint names across the (shared memory) wire
UrdfLinkNameMapUtil* util = new UrdfLinkNameMapUtil;
m_data->m_urdfLinkNameMapper.push_back(util);
util->m_mb = mb;
util->m_memSerializer = new btDefaultSerializer(SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE,(unsigned char*)m_data->m_testBlock1->m_bulletStreamDataServerToClient);
//disable serialization of the collision objects (they are too big, and the client likely doesn't need them);
util->m_memSerializer->m_skipPointers.insert(mb->getBaseCollider(),0);
for (int i=0;i<mb->getNumLinks();i++)
{
//disable serialization of the collision objects
util->m_memSerializer->m_skipPointers.insert(mb->getLink(i).m_collider,0);
int urdfLinkIndex = creation.m_mb2urdfLink[i];
std::string* linkName = new std::string(u2b.getLinkName(urdfLinkIndex).c_str());
m_data->m_strings.push_back(linkName);
util->m_memSerializer->registerNameForPointer(linkName->c_str(),linkName->c_str());
mb->getLink(i).m_linkName = linkName->c_str();
std::string* jointName = new std::string(u2b.getJointName(urdfLinkIndex).c_str());
m_data->m_strings.push_back(jointName);
util->m_memSerializer->registerNameForPointer(jointName->c_str(),jointName->c_str());
mb->getLink(i).m_jointName = jointName->c_str();
}
std::string* baseName = new std::string(u2b.getLinkName(u2b.getRootLinkIndex()));
m_data->m_strings.push_back(baseName);
util->m_memSerializer->registerNameForPointer(baseName->c_str(),baseName->c_str());
mb->setBaseName(baseName->c_str());
util->m_memSerializer->insertHeader();
int len = mb->calculateSerializeBufferSize();
btChunk* chunk = util->m_memSerializer->allocate(len,1);
const char* structType = mb->serialize(chunk->m_oldPtr, util->m_memSerializer);
util->m_memSerializer->finalizeChunk(chunk,structType,BT_MULTIBODY_CODE,mb);
return true;
} else
{
b3Warning("No multibody loaded from URDF. Could add btRigidBody+btTypedConstraint solution later.");
return false;
}
} else
{
btAssert(0);
return true;
}
}
return false;
}
void PhysicsServerSharedMemory::processClientCommands()
{
if (m_data->m_isConnected && m_data->m_testBlock1)
{
///we ignore overflow of integer for now
if (m_data->m_testBlock1->m_numClientCommands> m_data->m_testBlock1->m_numProcessedClientCommands)
{
//until we implement a proper ring buffer, we assume always maximum of 1 outstanding commands
btAssert(m_data->m_testBlock1->m_numClientCommands==m_data->m_testBlock1->m_numProcessedClientCommands+1);
const SharedMemoryCommand& clientCmd =m_data->m_testBlock1->m_clientCommands[0];
m_data->m_testBlock1->m_numProcessedClientCommands++;
//no timestamp yet
int timeStamp = 0;
//consume the command
switch (clientCmd.m_type)
{
case CMD_SEND_BULLET_DATA_STREAM:
{
if (m_data->m_verboseOutput)
{
b3Printf("Processed CMD_SEND_BULLET_DATA_STREAM length %d",clientCmd.m_dataStreamArguments.m_streamChunkLength);
}
btBulletWorldImporter* worldImporter = new btBulletWorldImporter(m_data->m_dynamicsWorld);
m_data->m_worldImporters.push_back(worldImporter);
bool completedOk = worldImporter->loadFileFromMemory(m_data->m_testBlock1->m_bulletStreamDataClientToServer,clientCmd.m_dataStreamArguments.m_streamChunkLength);
if (completedOk)
{
SharedMemoryStatus& status = m_data->createServerStatus(CMD_BULLET_DATA_STREAM_RECEIVED_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->m_guiHelper->autogenerateGraphicsObjects(this->m_data->m_dynamicsWorld);
m_data->submitServerStatus(status);
} else
{
SharedMemoryStatus& status = m_data->createServerStatus(CMD_BULLET_DATA_STREAM_RECEIVED_FAILED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(status);
}
break;
}
case CMD_REQUEST_DEBUG_LINES:
{
int curFlags =m_data->m_debugDrawer->getDebugMode();
int debugMode = clientCmd.m_requestDebugLinesArguments.m_debugMode;//clientCmd.btIDebugDraw::DBG_DrawWireframe|btIDebugDraw::DBG_DrawAabb;
int startingLineIndex = clientCmd.m_requestDebugLinesArguments.m_startingLineIndex;
if (startingLineIndex<0)
{
b3Warning("startingLineIndex should be non-negative");
startingLineIndex = 0;
}
if (clientCmd.m_requestDebugLinesArguments.m_startingLineIndex==0)
{
m_data->m_debugDrawer->m_lines2.resize(0);
//|btIDebugDraw::DBG_DrawAabb|
// btIDebugDraw::DBG_DrawConstraints |btIDebugDraw::DBG_DrawConstraintLimits ;
m_data->m_debugDrawer->setDebugMode(debugMode);
m_data->m_dynamicsWorld->debugDrawWorld();
m_data->m_debugDrawer->setDebugMode(curFlags);
}
//9 floats per line: 3 floats for 'from', 3 floats for 'to' and 3 floats for 'color'
int maxNumLines = SHARED_MEMORY_MAX_STREAM_CHUNK_SIZE/(sizeof(float)*9)-1;
if (startingLineIndex >m_data->m_debugDrawer->m_lines2.size())
{
b3Warning("m_startingLineIndex exceeds total number of debug lines");
startingLineIndex =m_data->m_debugDrawer->m_lines2.size();
}
int numLines = btMin(maxNumLines,m_data->m_debugDrawer->m_lines2.size()-startingLineIndex);
if (numLines)
{
float* linesFrom = (float*)&m_data->m_testBlock1->m_bulletStreamDataServerToClient[0];
float* linesTo = (float*)(&m_data->m_testBlock1->m_bulletStreamDataServerToClient[0]+numLines*3*sizeof(float));
float* linesColor = (float*)(&m_data->m_testBlock1->m_bulletStreamDataServerToClient[0]+2*numLines*3*sizeof(float));
for (int i=0;i<numLines;i++)
{
linesFrom[i*3] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_from.x();
linesTo[i*3] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_to.x();
linesColor[i*3] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_color.x();
linesFrom[i*3+1] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_from.y();
linesTo[i*3+1] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_to.y();
linesColor[i*3+1] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_color.y();
linesFrom[i*3+2] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_from.z();
linesTo[i*3+2] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_to.z();
linesColor[i*3+2] = m_data->m_debugDrawer->m_lines2[i+startingLineIndex].m_color.z();
}
}
SharedMemoryStatus& status = m_data->createServerStatus(CMD_DEBUG_LINES_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
status.m_sendDebugLinesArgs.m_numDebugLines = numLines;
status.m_sendDebugLinesArgs.m_startingLineIndex = startingLineIndex;
status.m_sendDebugLinesArgs.m_numRemainingDebugLines = m_data->m_debugDrawer->m_lines2.size()-(startingLineIndex+numLines);
m_data->submitServerStatus(status);
break;
}
case CMD_LOAD_URDF:
{
//at the moment, we only load 1 urdf / robot
if (m_data->m_urdfLinkNameMapper.size())
{
SharedMemoryStatus& status = m_data->createServerStatus(CMD_URDF_LOADING_FAILED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(status);
break;
}
const UrdfArgs& urdfArgs = clientCmd.m_urdfArguments;
if (m_data->m_verboseOutput)
{
b3Printf("Processed CMD_LOAD_URDF:%s", urdfArgs.m_urdfFileName);
}
btAssert((clientCmd.m_updateFlags&URDF_ARGS_FILE_NAME) !=0);
btAssert(urdfArgs.m_urdfFileName);
btVector3 initialPos(0,0,0);
btQuaternion initialOrn(0,0,0,1);
if (clientCmd.m_updateFlags & URDF_ARGS_INITIAL_POSITION)
{
initialPos[0] = urdfArgs.m_initialPosition[0];
initialPos[1] = urdfArgs.m_initialPosition[1];
initialPos[2] = urdfArgs.m_initialPosition[2];
}
if (clientCmd.m_updateFlags & URDF_ARGS_INITIAL_ORIENTATION)
{
initialOrn[0] = urdfArgs.m_initialOrientation[0];
initialOrn[1] = urdfArgs.m_initialOrientation[1];
initialOrn[2] = urdfArgs.m_initialOrientation[2];
initialOrn[3] = urdfArgs.m_initialOrientation[3];
}
bool useMultiBody=(clientCmd.m_updateFlags & URDF_ARGS_USE_MULTIBODY) ? urdfArgs.m_useMultiBody : true;
bool useFixedBase = (clientCmd.m_updateFlags & URDF_ARGS_USE_FIXED_BASE) ? urdfArgs.m_useFixedBase: false;
//load the actual URDF and send a report: completed or failed
bool completedOk = loadUrdf(urdfArgs.m_urdfFileName,
initialPos,initialOrn,
useMultiBody, useFixedBase);
SharedMemoryStatus& serverCmd =m_data->m_testBlock1->m_serverCommands[0];
if (completedOk)
{
if (m_data->m_urdfLinkNameMapper.size())
{
serverCmd.m_dataStreamArguments.m_streamChunkLength = m_data->m_urdfLinkNameMapper.at(m_data->m_urdfLinkNameMapper.size()-1)->m_memSerializer->getCurrentBufferSize();
}
m_data->m_guiHelper->autogenerateGraphicsObjects(this->m_data->m_dynamicsWorld);
SharedMemoryStatus& status = m_data->createServerStatus(CMD_URDF_LOADING_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(status);
} else
{
SharedMemoryStatus& status = m_data->createServerStatus(CMD_URDF_LOADING_FAILED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(status);
}
break;
}
case CMD_CREATE_SENSOR:
{
if (m_data->m_verboseOutput)
{
b3Printf("Processed CMD_CREATE_SENSOR");
}
if (m_data->m_dynamicsWorld->getNumMultibodies()>0)
{
btMultiBody* mb = m_data->m_dynamicsWorld->getMultiBody(0);
btAssert(mb);
for (int i=0;i<clientCmd.m_createSensorArguments.m_numJointSensorChanges;i++)
{
int jointIndex = clientCmd.m_createSensorArguments.m_jointIndex[i];
if (clientCmd.m_createSensorArguments.m_enableJointForceSensor[i])
{
if (mb->getLink(jointIndex).m_jointFeedback)
{
b3Warning("CMD_CREATE_SENSOR: sensor for joint [%d] already enabled", jointIndex);
} else
{
btMultiBodyJointFeedback* fb = new btMultiBodyJointFeedback();
fb->m_reactionForces.setZero();
mb->getLink(jointIndex).m_jointFeedback = fb;
m_data->m_multiBodyJointFeedbacks.push_back(fb);
};
} else
{
if (mb->getLink(jointIndex).m_jointFeedback)
{
m_data->m_multiBodyJointFeedbacks.remove(mb->getLink(jointIndex).m_jointFeedback);
delete mb->getLink(jointIndex).m_jointFeedback;
mb->getLink(jointIndex).m_jointFeedback=0;
} else
{
b3Warning("CMD_CREATE_SENSOR: cannot perform sensor removal request, no sensor on joint [%d]", jointIndex);
};
}
}
} else
{
b3Warning("No btMultiBody in the world. btRigidBody/btTypedConstraint sensor not hooked up yet");
}
#if 0
//todo(erwincoumans) here is some sample code to hook up a force/torque sensor for btTypedConstraint/btRigidBody
/*
for (int i=0;i<m_data->m_dynamicsWorld->getNumConstraints();i++)
{
btTypedConstraint* c = m_data->m_dynamicsWorld->getConstraint(i);
btJointFeedback* fb = new btJointFeedback();
m_data->m_jointFeedbacks.push_back(fb);
c->setJointFeedback(fb);
}
*/
#endif
SharedMemoryStatus& serverCmd =m_data->createServerStatus(CMD_CLIENT_COMMAND_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(serverCmd);
break;
}
case CMD_SEND_DESIRED_STATE:
{
if (m_data->m_verboseOutput)
{
b3Printf("Processed CMD_SEND_DESIRED_STATE");
}
if (m_data->m_dynamicsWorld->getNumMultibodies()>0)
{
btMultiBody* mb = m_data->m_dynamicsWorld->getMultiBody(0);
btAssert(mb);
switch (clientCmd.m_sendDesiredStateCommandArgument.m_controlMode)
{
case CONTROL_MODE_TORQUE:
{
if (m_data->m_verboseOutput)
{
b3Printf("Using CONTROL_MODE_TORQUE");
}
mb->clearForcesAndTorques();
int torqueIndex = 0;
btVector3 f(clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[0],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[1],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[2]);
btVector3 t(clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[3],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[4],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[5]);
torqueIndex+=6;
mb->addBaseForce(f);
mb->addBaseTorque(t);
for (int link=0;link<mb->getNumLinks();link++)
{
for (int dof=0;dof<mb->getLink(link).m_dofCount;dof++)
{
double torque = clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[torqueIndex];
mb->addJointTorqueMultiDof(link,dof,torque);
torqueIndex++;
}
}
break;
}
case CONTROL_MODE_VELOCITY:
{
if (m_data->m_verboseOutput)
{
b3Printf("Using CONTROL_MODE_VELOCITY");
}
int numMotors = 0;
//find the joint motors and apply the desired velocity and maximum force/torque
if (m_data->m_dynamicsWorld->getNumMultibodies()>0)
{
btMultiBody* mb = m_data->m_dynamicsWorld->getMultiBody(0);
int dofIndex = 6;//skip the 3 linear + 3 angular degree of freedom entries of the base
for (int link=0;link<mb->getNumLinks();link++)
{
if (supportsJointMotor(mb,link))
{
btMultiBodyJointMotor** motorPtr = m_data->m_multiBodyJointMotorMap[link];
if (motorPtr)
{
btMultiBodyJointMotor* motor = *motorPtr;
btScalar desiredVelocity = clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQdot[dofIndex];
motor->setVelocityTarget(desiredVelocity);
btScalar maxImp = clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[dofIndex]*m_data->m_physicsDeltaTime;
motor->setMaxAppliedImpulse(maxImp);
numMotors++;
}
}
dofIndex += mb->getLink(link).m_dofCount;
}
}
break;
}
case CONTROL_MODE_POSITION_VELOCITY_PD:
{
if (m_data->m_verboseOutput)
{
b3Printf("Using CONTROL_MODE_POSITION_VELOCITY_PD");
}
//compute the force base on PD control
mb->clearForcesAndTorques();
int numMotors = 0;
//find the joint motors and apply the desired velocity and maximum force/torque
if (m_data->m_dynamicsWorld->getNumMultibodies()>0)
{
btMultiBody* mb = m_data->m_dynamicsWorld->getMultiBody(0);
int velIndex = 6;//skip the 3 linear + 3 angular degree of freedom velocity entries of the base
int posIndex = 7;//skip 3 positional and 4 orientation (quaternion) positional degrees of freedom of the base
for (int link=0;link<mb->getNumLinks();link++)
{
if (supportsJointMotor(mb,link))
{
btMultiBodyJointMotor** motorPtr = m_data->m_multiBodyJointMotorMap[link];
if (motorPtr)
{
btMultiBodyJointMotor* motor = *motorPtr;
btScalar desiredVelocity = clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQdot[velIndex];
btScalar desiredPosition = clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQ[posIndex];
btScalar kp = clientCmd.m_sendDesiredStateCommandArgument.m_Kp[velIndex];
btScalar kd = clientCmd.m_sendDesiredStateCommandArgument.m_Kd[velIndex];
int dof1 = 0;
btScalar currentPosition = mb->getJointPosMultiDof(link)[dof1];
btScalar currentVelocity = mb->getJointVelMultiDof(link)[dof1];
btScalar positionStabiliationTerm = (desiredPosition-currentPosition)/m_data->m_physicsDeltaTime;
btScalar velocityError = (desiredVelocity - currentVelocity);
desiredVelocity = kp * positionStabiliationTerm +
kd * velocityError;
motor->setVelocityTarget(desiredVelocity);
btScalar maxImp = clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateForceTorque[velIndex]*m_data->m_physicsDeltaTime;
motor->setMaxAppliedImpulse(1000);//maxImp);
numMotors++;
}
}
velIndex += mb->getLink(link).m_dofCount;
posIndex += mb->getLink(link).m_posVarCount;
}
}
break;
}
default:
{
b3Warning("m_controlMode not implemented yet");
break;
}
}
}
SharedMemoryStatus& status = m_data->createServerStatus(CMD_DESIRED_STATE_RECEIVED_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(status);
break;
}
case CMD_REQUEST_ACTUAL_STATE:
{
if (m_data->m_verboseOutput)
{
b3Printf("Sending the actual state (Q,U)");
}
if (m_data->m_dynamicsWorld->getNumMultibodies()>0)
{
btMultiBody* mb = m_data->m_dynamicsWorld->getMultiBody(0);
SharedMemoryStatus& serverCmd = m_data->createServerStatus(CMD_ACTUAL_STATE_UPDATE_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
serverCmd.m_sendActualStateArgs.m_bodyUniqueId = 0;
int totalDegreeOfFreedomQ = 0;
int totalDegreeOfFreedomU = 0;
//always add the base, even for static (non-moving objects)
//so that we can easily move the 'fixed' base when needed
//do we don't use this conditional "if (!mb->hasFixedBase())"
{
btTransform tr;
tr.setOrigin(mb->getBasePos());
tr.setRotation(mb->getWorldToBaseRot().inverse());
serverCmd.m_sendActualStateArgs.m_rootLocalInertialFrame[0] =
m_data->m_rootLocalInertialFrame.getOrigin()[0];
serverCmd.m_sendActualStateArgs.m_rootLocalInertialFrame[1] =
m_data->m_rootLocalInertialFrame.getOrigin()[1];
serverCmd.m_sendActualStateArgs.m_rootLocalInertialFrame[2] =
m_data->m_rootLocalInertialFrame.getOrigin()[2];
serverCmd.m_sendActualStateArgs.m_rootLocalInertialFrame[3] =
m_data->m_rootLocalInertialFrame.getRotation()[0];
serverCmd.m_sendActualStateArgs.m_rootLocalInertialFrame[4] =
m_data->m_rootLocalInertialFrame.getRotation()[1];
serverCmd.m_sendActualStateArgs.m_rootLocalInertialFrame[5] =
m_data->m_rootLocalInertialFrame.getRotation()[2];
serverCmd.m_sendActualStateArgs.m_rootLocalInertialFrame[6] =
m_data->m_rootLocalInertialFrame.getRotation()[3];
//base position in world space, carthesian
serverCmd.m_sendActualStateArgs.m_actualStateQ[0] = tr.getOrigin()[0];
serverCmd.m_sendActualStateArgs.m_actualStateQ[1] = tr.getOrigin()[1];
serverCmd.m_sendActualStateArgs.m_actualStateQ[2] = tr.getOrigin()[2];
//base orientation, quaternion x,y,z,w, in world space, carthesian
serverCmd.m_sendActualStateArgs.m_actualStateQ[3] = tr.getRotation()[0];
serverCmd.m_sendActualStateArgs.m_actualStateQ[4] = tr.getRotation()[1];
serverCmd.m_sendActualStateArgs.m_actualStateQ[5] = tr.getRotation()[2];
serverCmd.m_sendActualStateArgs.m_actualStateQ[6] = tr.getRotation()[3];
totalDegreeOfFreedomQ +=7;//pos + quaternion
//base linear velocity (in world space, carthesian)
serverCmd.m_sendActualStateArgs.m_actualStateQdot[0] = mb->getBaseVel()[0];
serverCmd.m_sendActualStateArgs.m_actualStateQdot[1] = mb->getBaseVel()[1];
serverCmd.m_sendActualStateArgs.m_actualStateQdot[2] = mb->getBaseVel()[2];
//base angular velocity (in world space, carthesian)
serverCmd.m_sendActualStateArgs.m_actualStateQdot[3] = mb->getBaseOmega()[0];
serverCmd.m_sendActualStateArgs.m_actualStateQdot[4] = mb->getBaseOmega()[1];
serverCmd.m_sendActualStateArgs.m_actualStateQdot[5] = mb->getBaseOmega()[2];
totalDegreeOfFreedomU += 6;//3 linear and 3 angular DOF
}
for (int l=0;l<mb->getNumLinks();l++)
{
for (int d=0;d<mb->getLink(l).m_posVarCount;d++)
{
serverCmd.m_sendActualStateArgs.m_actualStateQ[totalDegreeOfFreedomQ++] = mb->getJointPosMultiDof(l)[d];
}
for (int d=0;d<mb->getLink(l).m_dofCount;d++)
{
serverCmd.m_sendActualStateArgs.m_actualStateQdot[totalDegreeOfFreedomU++] = mb->getJointVelMultiDof(l)[d];
}
if (0 == mb->getLink(l).m_jointFeedback)
{
for (int d=0;d<6;d++)
{
serverCmd.m_sendActualStateArgs.m_jointReactionForces[l*6+d]=0;
}
} else
{
btVector3 sensedForce = mb->getLink(l).m_jointFeedback->m_reactionForces.getLinear();
btVector3 sensedTorque = mb->getLink(l).m_jointFeedback->m_reactionForces.getAngular();
serverCmd.m_sendActualStateArgs.m_jointReactionForces[l*6+0] = sensedForce[0];
serverCmd.m_sendActualStateArgs.m_jointReactionForces[l*6+1] = sensedForce[1];
serverCmd.m_sendActualStateArgs.m_jointReactionForces[l*6+2] = sensedForce[2];
serverCmd.m_sendActualStateArgs.m_jointReactionForces[l*6+3] = sensedTorque[0];
serverCmd.m_sendActualStateArgs.m_jointReactionForces[l*6+4] = sensedTorque[1];
serverCmd.m_sendActualStateArgs.m_jointReactionForces[l*6+5] = sensedTorque[2];
}
}
serverCmd.m_sendActualStateArgs.m_numDegreeOfFreedomQ = totalDegreeOfFreedomQ;
serverCmd.m_sendActualStateArgs.m_numDegreeOfFreedomU = totalDegreeOfFreedomU;
m_data->submitServerStatus(serverCmd);
} else
{
b3Warning("Request state but no multibody available");
SharedMemoryStatus& serverCmd = m_data->createServerStatus(CMD_ACTUAL_STATE_UPDATE_FAILED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(serverCmd);
}
break;
}
case CMD_STEP_FORWARD_SIMULATION:
{
if (m_data->m_verboseOutput)
{
b3Printf("Step simulation request");
}
m_data->m_dynamicsWorld->stepSimulation(m_data->m_physicsDeltaTime,0);
SharedMemoryStatus& serverCmd =m_data->createServerStatus(CMD_STEP_FORWARD_SIMULATION_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(serverCmd);
break;
}
case CMD_SEND_PHYSICS_SIMULATION_PARAMETERS:
{
if (clientCmd.m_updateFlags&SIM_PARAM_UPDATE_DELTA_TIME)
{
m_data->m_physicsDeltaTime = clientCmd.m_physSimParamArgs.m_deltaTime;
}
if (clientCmd.m_updateFlags&SIM_PARAM_UPDATE_GRAVITY)
{
btVector3 grav(clientCmd.m_physSimParamArgs.m_gravityAcceleration[0],
clientCmd.m_physSimParamArgs.m_gravityAcceleration[1],
clientCmd.m_physSimParamArgs.m_gravityAcceleration[2]);
this->m_data->m_dynamicsWorld->setGravity(grav);
if (m_data->m_verboseOutput)
{
b3Printf("Updated Gravity: %f,%f,%f",grav[0],grav[1],grav[2]);
}
}
SharedMemoryStatus& serverCmd =m_data->createServerStatus(CMD_CLIENT_COMMAND_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(serverCmd);
break;
};
case CMD_INIT_POSE:
{
if (m_data->m_verboseOutput)
{
b3Printf("Server Init Pose not implemented yet");
}
int body_unique_id = clientCmd.m_sendDesiredStateCommandArgument.m_bodyUniqueId;
if (m_data->m_dynamicsWorld->getNumMultibodies()>body_unique_id)
{
btMultiBody* mb = m_data->m_dynamicsWorld->getMultiBody(body_unique_id);
mb->setBasePos(btVector3(
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQ[0],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQ[1],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQ[2]));
mb->setWorldToBaseRot(btQuaternion(
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQ[3],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQ[4],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQ[5],
clientCmd.m_sendDesiredStateCommandArgument.m_desiredStateQ[6]));
}
SharedMemoryStatus& serverCmd =m_data->createServerStatus(CMD_CLIENT_COMMAND_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(serverCmd);
break;
}
case CMD_RESET_SIMULATION:
{
//clean up all data
if (m_data && m_data->m_guiHelper && m_data->m_guiHelper->getRenderInterface())
{
m_data->m_guiHelper->getRenderInterface()->removeAllInstances();
}
deleteDynamicsWorld();
createEmptyDynamicsWorld();
SharedMemoryStatus& serverCmd =m_data->createServerStatus(CMD_RESET_SIMULATION_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(serverCmd);
break;
}
case CMD_CREATE_BOX_COLLISION_SHAPE:
{
btVector3 halfExtents(1,1,1);
if (clientCmd.m_updateFlags & BOX_SHAPE_HAS_HALF_EXTENTS)
{
halfExtents = btVector3(
clientCmd.m_createBoxShapeArguments.m_halfExtentsX,
clientCmd.m_createBoxShapeArguments.m_halfExtentsY,
clientCmd.m_createBoxShapeArguments.m_halfExtentsZ);
}
btTransform startTrans;
startTrans.setIdentity();
if (clientCmd.m_updateFlags & BOX_SHAPE_HAS_INITIAL_POSITION)
{
startTrans.setOrigin(btVector3(
clientCmd.m_createBoxShapeArguments.m_initialPosition[0],
clientCmd.m_createBoxShapeArguments.m_initialPosition[1],
clientCmd.m_createBoxShapeArguments.m_initialPosition[2]));
}
if (clientCmd.m_updateFlags & BOX_SHAPE_HAS_INITIAL_ORIENTATION)
{
startTrans.setRotation(btQuaternion(
clientCmd.m_createBoxShapeArguments.m_initialOrientation[0],
clientCmd.m_createBoxShapeArguments.m_initialOrientation[1],
clientCmd.m_createBoxShapeArguments.m_initialOrientation[2],
clientCmd.m_createBoxShapeArguments.m_initialOrientation[3]));
}
btBulletWorldImporter* worldImporter = new btBulletWorldImporter(m_data->m_dynamicsWorld);
m_data->m_worldImporters.push_back(worldImporter);
btCollisionShape* shape = worldImporter->createBoxShape(halfExtents);
btScalar mass = 0.f;
bool isDynamic = (mass>0);
worldImporter->createRigidBody(isDynamic,mass,startTrans,shape,0);
m_data->m_guiHelper->autogenerateGraphicsObjects(this->m_data->m_dynamicsWorld);
SharedMemoryStatus& serverCmd =m_data->createServerStatus(CMD_CLIENT_COMMAND_COMPLETED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(serverCmd);
break;
}
case CMD_PICK_BODY:
{
pickBody(btVector3(clientCmd.m_pickBodyArguments.m_rayFromWorld[0],
clientCmd.m_pickBodyArguments.m_rayFromWorld[1],
clientCmd.m_pickBodyArguments.m_rayFromWorld[2]),
btVector3(clientCmd.m_pickBodyArguments.m_rayToWorld[0],
clientCmd.m_pickBodyArguments.m_rayToWorld[1],
clientCmd.m_pickBodyArguments.m_rayToWorld[2]));
SharedMemoryStatus &serverCmd =
m_data->createServerStatus(CMD_CLIENT_COMMAND_COMPLETED,
clientCmd.m_sequenceNumber, timeStamp);
m_data->submitServerStatus(serverCmd);
break;
}
case CMD_MOVE_PICKED_BODY:
{
movePickedBody(btVector3(clientCmd.m_pickBodyArguments.m_rayFromWorld[0],
clientCmd.m_pickBodyArguments.m_rayFromWorld[1],
clientCmd.m_pickBodyArguments.m_rayFromWorld[2]),
btVector3(clientCmd.m_pickBodyArguments.m_rayToWorld[0],
clientCmd.m_pickBodyArguments.m_rayToWorld[1],
clientCmd.m_pickBodyArguments.m_rayToWorld[2]));
SharedMemoryStatus &serverCmd =
m_data->createServerStatus(CMD_CLIENT_COMMAND_COMPLETED,
clientCmd.m_sequenceNumber, timeStamp);
m_data->submitServerStatus(serverCmd);
break;
}
case CMD_REMOVE_PICKING_CONSTRAINT_BODY:
{
removePickingConstraint();
SharedMemoryStatus &serverCmd =
m_data->createServerStatus(CMD_CLIENT_COMMAND_COMPLETED,
clientCmd.m_sequenceNumber, timeStamp);
m_data->submitServerStatus(serverCmd);
break;
}
default:
{
b3Error("Unknown command encountered");
SharedMemoryStatus& serverCmd =m_data->createServerStatus(CMD_UNKNOWN_COMMAND_FLUSHED,clientCmd.m_sequenceNumber,timeStamp);
m_data->submitServerStatus(serverCmd);
}
};
}
}
}
void PhysicsServerSharedMemory::renderScene()
{
if (m_data->m_guiHelper)
{
m_data->m_guiHelper->syncPhysicsToGraphics(m_data->m_dynamicsWorld);
m_data->m_guiHelper->render(m_data->m_dynamicsWorld);
}
}
void PhysicsServerSharedMemory::physicsDebugDraw(int debugDrawFlags)
{
#if 0
if (m_data->m_dynamicsWorld)
{
if (m_data->m_dynamicsWorld->getDebugDrawer())
{
//m_data->m_debugDrawer->m_lines.clear();
//m_data->m_dynamicsWorld->getDebugDrawer()->setDebugMode(debugDrawFlags);
}
m_data->m_dynamicsWorld->debugDrawWorld();
}
#endif
}
bool PhysicsServerSharedMemory::pickBody(const btVector3& rayFromWorld, const btVector3& rayToWorld)
{
if (m_data->m_dynamicsWorld==0)
return false;
btCollisionWorld::ClosestRayResultCallback rayCallback(rayFromWorld, rayToWorld);
m_data->m_dynamicsWorld->rayTest(rayFromWorld, rayToWorld, rayCallback);
if (rayCallback.hasHit())
{
btVector3 pickPos = rayCallback.m_hitPointWorld;
btRigidBody* body = (btRigidBody*)btRigidBody::upcast(rayCallback.m_collisionObject);
if (body)
{
//other exclusions?
if (!(body->isStaticObject() || body->isKinematicObject()))
{
m_data->m_pickedBody = body;
m_data->m_pickedBody->setActivationState(DISABLE_DEACTIVATION);
//printf("pickPos=%f,%f,%f\n",pickPos.getX(),pickPos.getY(),pickPos.getZ());
btVector3 localPivot = body->getCenterOfMassTransform().inverse() * pickPos;
btPoint2PointConstraint* p2p = new btPoint2PointConstraint(*body, localPivot);
m_data->m_dynamicsWorld->addConstraint(p2p, true);
m_data->m_pickedConstraint = p2p;
btScalar mousePickClamping = 30.f;
p2p->m_setting.m_impulseClamp = mousePickClamping;
//very weak constraint for picking
p2p->m_setting.m_tau = 0.001f;
}
} else
{
btMultiBodyLinkCollider* multiCol = (btMultiBodyLinkCollider*)btMultiBodyLinkCollider::upcast(rayCallback.m_collisionObject);
if (multiCol && multiCol->m_multiBody)
{
m_data->m_prevCanSleep = multiCol->m_multiBody->getCanSleep();
multiCol->m_multiBody->setCanSleep(false);
btVector3 pivotInA = multiCol->m_multiBody->worldPosToLocal(multiCol->m_link, pickPos);
btMultiBodyPoint2Point* p2p = new btMultiBodyPoint2Point(multiCol->m_multiBody,multiCol->m_link,0,pivotInA,pickPos);
//if you add too much energy to the system, causing high angular velocities, simulation 'explodes'
//see also http://www.bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=4&t=949
//so we try to avoid it by clamping the maximum impulse (force) that the mouse pick can apply
//it is not satisfying, hopefully we find a better solution (higher order integrator, using joint friction using a zero-velocity target motor with limited force etc?)
btScalar scaling=1;
p2p->setMaxAppliedImpulse(2*scaling);
btMultiBodyDynamicsWorld* world = (btMultiBodyDynamicsWorld*) m_data->m_dynamicsWorld;
world->addMultiBodyConstraint(p2p);
m_data->m_pickingMultiBodyPoint2Point =p2p;
}
}
// pickObject(pickPos, rayCallback.m_collisionObject);
m_data->m_oldPickingPos = rayToWorld;
m_data->m_hitPos = pickPos;
m_data->m_oldPickingDist = (pickPos - rayFromWorld).length();
// printf("hit !\n");
//add p2p
}
return false;
}
bool PhysicsServerSharedMemory::movePickedBody(const btVector3& rayFromWorld, const btVector3& rayToWorld)
{
if (m_data->m_pickedBody && m_data->m_pickedConstraint)
{
btPoint2PointConstraint* pickCon = static_cast<btPoint2PointConstraint*>(m_data->m_pickedConstraint);
if (pickCon)
{
//keep it at the same picking distance
btVector3 dir = rayToWorld-rayFromWorld;
dir.normalize();
dir *= m_data->m_oldPickingDist;
btVector3 newPivotB = rayFromWorld + dir;
pickCon->setPivotB(newPivotB);
}
}
if (m_data->m_pickingMultiBodyPoint2Point)
{
//keep it at the same picking distance
btVector3 dir = rayToWorld-rayFromWorld;
dir.normalize();
dir *= m_data->m_oldPickingDist;
btVector3 newPivotB = rayFromWorld + dir;
m_data->m_pickingMultiBodyPoint2Point->setPivotInB(newPivotB);
}
return false;
}
void PhysicsServerSharedMemory::removePickingConstraint()
{
if (m_data->m_pickedConstraint)
{
m_data->m_dynamicsWorld->removeConstraint(m_data->m_pickedConstraint);
delete m_data->m_pickedConstraint;
m_data->m_pickedConstraint = 0;
m_data->m_pickedBody = 0;
}
if (m_data->m_pickingMultiBodyPoint2Point)
{
m_data->m_pickingMultiBodyPoint2Point->getMultiBodyA()->setCanSleep(m_data->m_prevCanSleep);
btMultiBodyDynamicsWorld* world = (btMultiBodyDynamicsWorld*) m_data->m_dynamicsWorld;
world->removeMultiBodyConstraint(m_data->m_pickingMultiBodyPoint2Point);
delete m_data->m_pickingMultiBodyPoint2Point;
m_data->m_pickingMultiBodyPoint2Point = 0;
}
}
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