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https://github.com/bulletphysics/bullet3
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A fileIO plugin can override custom file IO operations. As a small test, load files from a zipfile in memory. Default fileIO implementation is in examples/Utils/b3BulletDefaultFileIO.h Affects URDF, SDF, MJCF, Wavefront OBJ, STL, DAE, images.
302 lines
8.4 KiB
C++
302 lines
8.4 KiB
C++
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#include "ImportSDFSetup.h"
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#include "BulletDynamics/ConstraintSolver/btGeneric6DofSpring2Constraint.h"
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#include "BulletDynamics/Featherstone/btMultiBodyLinkCollider.h"
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#include "Bullet3Common/b3FileUtils.h"
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#include "BulletDynamics/Featherstone/btMultiBodyJointMotor.h"
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#include "BulletDynamics/Featherstone/btMultiBodyDynamicsWorld.h"
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#include "../CommonInterfaces/CommonParameterInterface.h"
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#include "../../Utils/b3ResourcePath.h"
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#include "../ImportURDFDemo/BulletUrdfImporter.h"
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#include "../ImportURDFDemo/URDF2Bullet.h"
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//#include "urdf_samples.h"
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#include "../CommonInterfaces/CommonMultiBodyBase.h"
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#include "../ImportURDFDemo/MyMultiBodyCreator.h"
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class ImportSDFSetup : public CommonMultiBodyBase
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{
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char m_fileName[1024];
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struct ImportSDFInternalData* m_data;
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bool m_useMultiBody;
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//todo(erwincoumans) we need a name memory for each model
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btAlignedObjectArray<std::string*> m_nameMemory;
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public:
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ImportSDFSetup(struct GUIHelperInterface* helper, int option, const char* fileName);
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virtual ~ImportSDFSetup();
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virtual void initPhysics();
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virtual void stepSimulation(float deltaTime);
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void setFileName(const char* urdfFileName);
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virtual void resetCamera()
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{
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float dist = 3.5;
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float pitch = -28;
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float yaw = -136;
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float targetPos[3] = {0.47, 0, -0.64};
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m_guiHelper->resetCamera(dist, yaw, pitch, targetPos[0], targetPos[1], targetPos[2]);
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}
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};
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static btAlignedObjectArray<std::string> gFileNameArray;
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#define MAX_NUM_MOTORS 1024
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struct ImportSDFInternalData
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{
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ImportSDFInternalData()
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: m_numMotors(0)
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{
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for (int i = 0; i < MAX_NUM_MOTORS; i++)
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{
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m_jointMotors[i] = 0;
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m_generic6DofJointMotors[i] = 0;
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}
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}
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btScalar m_motorTargetVelocities[MAX_NUM_MOTORS];
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btMultiBodyJointMotor* m_jointMotors[MAX_NUM_MOTORS];
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btGeneric6DofSpring2Constraint* m_generic6DofJointMotors[MAX_NUM_MOTORS];
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int m_numMotors;
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};
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ImportSDFSetup::ImportSDFSetup(struct GUIHelperInterface* helper, int option, const char* fileName)
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: CommonMultiBodyBase(helper)
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{
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m_data = new ImportSDFInternalData;
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(void)option;
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// if (option==1)
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// {
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m_useMultiBody = true;
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//
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// } else
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// {
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// m_useMultiBody = false;
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// }
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static int count = 0;
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if (fileName)
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{
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setFileName(fileName);
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}
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else
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{
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gFileNameArray.clear();
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//load additional urdf file names from file
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FILE* f = fopen("sdf_files.txt", "r");
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if (f)
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{
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int result;
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//warning: we don't avoid string buffer overflow in this basic example in fscanf
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char fileName[1024];
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do
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{
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result = fscanf(f, "%s", fileName);
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b3Printf("sdf_files.txt entry %s", fileName);
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if (result == 1)
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{
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gFileNameArray.push_back(fileName);
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}
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} while (result == 1);
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fclose(f);
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}
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if (gFileNameArray.size() == 0)
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{
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gFileNameArray.push_back("two_cubes.sdf");
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}
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int numFileNames = gFileNameArray.size();
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if (count >= numFileNames)
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{
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count = 0;
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}
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sprintf(m_fileName, "%s", gFileNameArray[count++].c_str());
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}
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}
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ImportSDFSetup::~ImportSDFSetup()
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{
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for (int i = 0; i < m_nameMemory.size(); i++)
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{
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delete m_nameMemory[i];
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}
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m_nameMemory.clear();
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delete m_data;
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}
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void ImportSDFSetup::setFileName(const char* urdfFileName)
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{
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memcpy(m_fileName, urdfFileName, strlen(urdfFileName) + 1);
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}
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void ImportSDFSetup::initPhysics()
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{
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int upAxis = 2;
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m_guiHelper->setUpAxis(upAxis);
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this->createEmptyDynamicsWorld();
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//m_dynamicsWorld->getSolverInfo().m_numIterations = 100;
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m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
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m_dynamicsWorld->getDebugDrawer()->setDebugMode(
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btIDebugDraw::DBG_DrawConstraints + btIDebugDraw::DBG_DrawContactPoints + btIDebugDraw::DBG_DrawAabb); //+btIDebugDraw::DBG_DrawConstraintLimits);
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btVector3 gravity(0, 0, 0);
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gravity[upAxis] = -9.8;
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m_dynamicsWorld->setGravity(gravity);
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BulletURDFImporter u2b(m_guiHelper, 0, 0, 1, 0);
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bool loadOk = u2b.loadSDF(m_fileName);
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if (loadOk)
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{
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//printTree(u2b,u2b.getRootLinkIndex());
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//u2b.printTree();
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btTransform rootTrans;
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rootTrans.setIdentity();
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for (int m = 0; m < u2b.getNumModels(); m++)
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{
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u2b.activateModel(m);
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btMultiBody* mb = 0;
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//todo: move these internal API called inside the 'ConvertURDF2Bullet' call, hidden from the user
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//int rootLinkIndex = u2b.getRootLinkIndex();
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//b3Printf("urdf root link index = %d\n",rootLinkIndex);
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MyMultiBodyCreator creation(m_guiHelper);
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u2b.getRootTransformInWorld(rootTrans);
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ConvertURDF2Bullet(u2b, creation, rootTrans, m_dynamicsWorld, m_useMultiBody, u2b.getPathPrefix(), CUF_USE_SDF);
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mb = creation.getBulletMultiBody();
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if (m_useMultiBody && mb)
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{
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std::string* name = new std::string(u2b.getLinkName(u2b.getRootLinkIndex()));
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m_nameMemory.push_back(name);
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#ifdef TEST_MULTIBODY_SERIALIZATION
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s->registerNameForPointer(name->c_str(), name->c_str());
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#endif //TEST_MULTIBODY_SERIALIZATION
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mb->setBaseName(name->c_str());
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//create motors for each btMultiBody joint
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int numLinks = mb->getNumLinks();
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for (int i = 0; i < numLinks; i++)
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{
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int mbLinkIndex = i;
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int urdfLinkIndex = creation.m_mb2urdfLink[mbLinkIndex];
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std::string* jointName = new std::string(u2b.getJointName(urdfLinkIndex));
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std::string* linkName = new std::string(u2b.getLinkName(urdfLinkIndex).c_str());
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#ifdef TEST_MULTIBODY_SERIALIZATION
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s->registerNameForPointer(jointName->c_str(), jointName->c_str());
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s->registerNameForPointer(linkName->c_str(), linkName->c_str());
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#endif //TEST_MULTIBODY_SERIALIZATION
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m_nameMemory.push_back(jointName);
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m_nameMemory.push_back(linkName);
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mb->getLink(i).m_linkName = linkName->c_str();
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mb->getLink(i).m_jointName = jointName->c_str();
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if (mb->getLink(mbLinkIndex).m_jointType == btMultibodyLink::eRevolute || mb->getLink(mbLinkIndex).m_jointType == btMultibodyLink::ePrismatic)
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{
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if (m_data->m_numMotors < MAX_NUM_MOTORS)
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{
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char motorName[1024];
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sprintf(motorName, "%s q'", jointName->c_str());
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btScalar* motorVel = &m_data->m_motorTargetVelocities[m_data->m_numMotors];
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*motorVel = 0.f;
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SliderParams slider(motorName, motorVel);
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slider.m_minVal = -4;
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slider.m_maxVal = 4;
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m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
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float maxMotorImpulse = 10.1f;
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btMultiBodyJointMotor* motor = new btMultiBodyJointMotor(mb, mbLinkIndex, 0, 0, maxMotorImpulse);
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//motor->setMaxAppliedImpulse(0);
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m_data->m_jointMotors[m_data->m_numMotors] = motor;
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m_dynamicsWorld->addMultiBodyConstraint(motor);
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m_data->m_numMotors++;
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}
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}
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}
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}
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}
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for (int i = 0; i < m_dynamicsWorld->getNumMultiBodyConstraints(); i++)
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{
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m_dynamicsWorld->getMultiBodyConstraint(i)->finalizeMultiDof();
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}
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bool createGround = true;
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if (createGround)
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{
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btVector3 groundHalfExtents(20, 20, 20);
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groundHalfExtents[upAxis] = 1.f;
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btBoxShape* box = new btBoxShape(groundHalfExtents);
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box->initializePolyhedralFeatures();
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m_guiHelper->createCollisionShapeGraphicsObject(box);
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btTransform start;
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start.setIdentity();
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btVector3 groundOrigin(0, 0, 0);
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groundOrigin[upAxis] = -2.5;
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start.setOrigin(groundOrigin);
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btRigidBody* body = createRigidBody(0, start, box);
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//m_dynamicsWorld->removeRigidBody(body);
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// m_dynamicsWorld->addRigidBody(body,2,1);
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btVector3 color(0.5, 0.5, 0.5);
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m_guiHelper->createRigidBodyGraphicsObject(body, color);
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}
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///this extra stepSimulation call makes sure that all the btMultibody transforms are properly propagates.
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m_dynamicsWorld->stepSimulation(1. / 240., 0); // 1., 10, 1. / 240.);
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}
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}
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void ImportSDFSetup::stepSimulation(float deltaTime)
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{
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if (m_dynamicsWorld)
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{
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for (int i = 0; i < m_data->m_numMotors; i++)
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{
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if (m_data->m_jointMotors[i])
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{
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m_data->m_jointMotors[i]->setVelocityTarget(m_data->m_motorTargetVelocities[i]);
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}
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if (m_data->m_generic6DofJointMotors[i])
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{
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GenericConstraintUserInfo* jointInfo = (GenericConstraintUserInfo*)m_data->m_generic6DofJointMotors[i]->getUserConstraintPtr();
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m_data->m_generic6DofJointMotors[i]->setTargetVelocity(jointInfo->m_jointAxisIndex, m_data->m_motorTargetVelocities[i]);
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//jointInfo->
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}
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}
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//the maximal coordinates/iterative MLCP solver requires a smallish timestep to converge
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m_dynamicsWorld->stepSimulation(deltaTime, 10, 1. / 240.);
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}
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}
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class CommonExampleInterface* ImportSDFCreateFunc(struct CommonExampleOptions& options)
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{
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return new ImportSDFSetup(options.m_guiHelper, options.m_option, options.m_fileName);
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}
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