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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.
374 lines
11 KiB
C++
374 lines
11 KiB
C++
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#include "ImportMJCFSetup.h"
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#include "BulletDynamics/ConstraintSolver/btGeneric6DofSpring2Constraint.h"
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//#define TEST_MULTIBODY_SERIALIZATION 1
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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 "../../Utils/b3BulletDefaultFileIO.h"
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#include "../CommonInterfaces/CommonMultiBodyBase.h"
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#include "../ImportURDFDemo/MyMultiBodyCreator.h"
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#include "BulletMJCFImporter.h"
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#include "../ImportURDFDemo/URDF2Bullet.h"
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class ImportMJCFSetup : public CommonMultiBodyBase
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{
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char m_fileName[1024];
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struct ImportMJCFInternalData* m_data;
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bool m_useMultiBody;
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btAlignedObjectArray<std::string*> m_nameMemory;
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btScalar m_grav;
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int m_upAxis;
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public:
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ImportMJCFSetup(struct GUIHelperInterface* helper, int option, const char* fileName);
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virtual ~ImportMJCFSetup();
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virtual void initPhysics();
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virtual void stepSimulation(float deltaTime);
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void setFileName(const char* mjcfFileName);
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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> gMCFJFileNameArray;
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#define MAX_NUM_MOTORS 1024
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struct ImportMJCFInternalData
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{
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ImportMJCFInternalData()
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: m_numMotors(0),
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m_mb(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_motorTargetPositions[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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btMultiBody* m_mb;
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btRigidBody* m_rb;
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};
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ImportMJCFSetup::ImportMJCFSetup(struct GUIHelperInterface* helper, int option, const char* fileName)
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: CommonMultiBodyBase(helper),
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m_grav(-10),
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m_upAxis(2)
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{
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m_data = new ImportMJCFInternalData;
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m_useMultiBody = true;
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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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gMCFJFileNameArray.clear();
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//load additional MJCF file names from file
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FILE* f = fopen("mjcf_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("mjcf_files.txt entry %s", fileName);
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if (result == 1)
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{
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gMCFJFileNameArray.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 (gMCFJFileNameArray.size() == 0)
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{
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gMCFJFileNameArray.push_back("mjcf/humanoid.xml");
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gMCFJFileNameArray.push_back("MPL/MPL.xml");
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gMCFJFileNameArray.push_back("mjcf/inverted_pendulum.xml");
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gMCFJFileNameArray.push_back("mjcf/ant.xml");
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gMCFJFileNameArray.push_back("mjcf/hello_mjcf.xml");
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gMCFJFileNameArray.push_back("mjcf/cylinder.xml");
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gMCFJFileNameArray.push_back("mjcf/cylinder_fromtoX.xml");
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gMCFJFileNameArray.push_back("mjcf/cylinder_fromtoY.xml");
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gMCFJFileNameArray.push_back("mjcf/cylinder_fromtoZ.xml");
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gMCFJFileNameArray.push_back("mjcf/capsule.xml");
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gMCFJFileNameArray.push_back("mjcf/capsule_fromtoX.xml");
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gMCFJFileNameArray.push_back("mjcf/capsule_fromtoY.xml");
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gMCFJFileNameArray.push_back("mjcf/capsule_fromtoZ.xml");
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gMCFJFileNameArray.push_back("mjcf/hopper.xml");
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gMCFJFileNameArray.push_back("mjcf/swimmer.xml");
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gMCFJFileNameArray.push_back("mjcf/reacher.xml");
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}
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int numFileNames = gMCFJFileNameArray.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", gMCFJFileNameArray[count++].c_str());
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}
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}
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ImportMJCFSetup::~ImportMJCFSetup()
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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 ImportMJCFSetup::setFileName(const char* mjcfFileName)
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{
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memcpy(m_fileName, mjcfFileName, strlen(mjcfFileName) + 1);
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}
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struct MyMJCFLogger : public MJCFErrorLogger
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{
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virtual void reportError(const char* error)
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{
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b3Error(error);
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}
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virtual void reportWarning(const char* warning)
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{
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b3Warning(warning);
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}
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virtual void printMessage(const char* msg)
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{
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b3Printf(msg);
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}
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};
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void ImportMJCFSetup::initPhysics()
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{
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m_guiHelper->setUpAxis(m_upAxis);
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createEmptyDynamicsWorld();
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//MuJoCo uses a slightly different collision filter mode, use the FILTER_GROUPAMASKB_OR_GROUPBMASKA2
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//@todo also use the modified collision filter for raycast and other collision related queries
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m_filterCallback->m_filterMode = FILTER_GROUPAMASKB_OR_GROUPBMASKA2;
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//m_dynamicsWorld->getSolverInfo().m_numIterations = 50;
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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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if (m_guiHelper->getParameterInterface())
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{
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SliderParams slider("Gravity", &m_grav);
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slider.m_minVal = -10;
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slider.m_maxVal = 10;
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m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
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}
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int flags = 0;
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b3BulletDefaultFileIO fileIO;
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BulletMJCFImporter importer(m_guiHelper, 0, &fileIO, flags);
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MyMJCFLogger logger;
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bool result = importer.loadMJCF(m_fileName, &logger);
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if (result)
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{
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btTransform rootTrans;
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rootTrans.setIdentity();
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for (int m = 0; m < importer.getNumModels(); m++)
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{
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importer.activateModel(m);
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// normally used with PhysicsServerCommandProcessor that allocates unique ids to multibodies,
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// emulate this behavior here:
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importer.setBodyUniqueId(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 = importer.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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rootTrans.setIdentity();
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importer.getRootTransformInWorld(rootTrans);
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ConvertURDF2Bullet(importer, creation, rootTrans, m_dynamicsWorld, m_useMultiBody, importer.getPathPrefix(), CUF_USE_MJCF);
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mb = creation.getBulletMultiBody();
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if (mb)
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{
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std::string* name =
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new std::string(importer.getLinkName(
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importer.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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mb->getBaseCollider()->setCollisionFlags(mb->getBaseCollider()->getCollisionFlags() | btCollisionObject::CF_HAS_FRICTION_ANCHOR);
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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(importer.getJointName(urdfLinkIndex));
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std::string* linkName = new std::string(importer.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->getLinkCollider(i)->setCollisionFlags(mb->getBaseCollider()->getCollisionFlags() | btCollisionObject::CF_HAS_FRICTION_ANCHOR);
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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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m_data->m_mb = mb;
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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* motorPos = &m_data->m_motorTargetPositions[m_data->m_numMotors];
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*motorPos = 0.f;
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SliderParams slider(motorName, motorPos);
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slider.m_minVal = -4;
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slider.m_maxVal = 4;
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slider.m_clampToIntegers = false;
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slider.m_clampToNotches = false;
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m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
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float maxMotorImpulse = 5.f;
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btMultiBodyJointMotor* motor = new btMultiBodyJointMotor(mb, mbLinkIndex, 0, 0, maxMotorImpulse);
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motor->setErp(0.1);
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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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else
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{
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// not multibody
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if (1)
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{
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//create motors for each generic joint
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int num6Dof = creation.getNum6DofConstraints();
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for (int i = 0; i < num6Dof; i++)
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{
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btGeneric6DofSpring2Constraint* c = creation.get6DofConstraint(i);
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if (c->getUserConstraintPtr())
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{
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GenericConstraintUserInfo* jointInfo = (GenericConstraintUserInfo*)c->getUserConstraintPtr();
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if ((jointInfo->m_urdfJointType == URDFRevoluteJoint) ||
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(jointInfo->m_urdfJointType == URDFPrismaticJoint) ||
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(jointInfo->m_urdfJointType == URDFContinuousJoint))
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{
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int urdfLinkIndex = jointInfo->m_urdfIndex;
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std::string jointName = importer.getJointName(urdfLinkIndex);
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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_motorTargetPositions[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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m_data->m_generic6DofJointMotors[m_data->m_numMotors] = c;
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bool motorOn = true;
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c->enableMotor(jointInfo->m_jointAxisIndex, motorOn);
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c->setMaxMotorForce(jointInfo->m_jointAxisIndex, 10000);
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c->setTargetVelocity(jointInfo->m_jointAxisIndex, 0);
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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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}
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m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
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}
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}
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void ImportMJCFSetup::stepSimulation(float deltaTime)
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{
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if (m_dynamicsWorld)
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{
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btVector3 gravity(0, 0, -10);
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gravity[m_upAxis] = m_grav;
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m_dynamicsWorld->setGravity(gravity);
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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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btScalar pos = m_data->m_motorTargetPositions[i];
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int link = m_data->m_jointMotors[i]->getLinkA();
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btScalar lowerLimit = m_data->m_mb->getLink(link).m_jointLowerLimit;
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btScalar upperLimit = m_data->m_mb->getLink(link).m_jointUpperLimit;
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if (lowerLimit < upperLimit)
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{
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btClamp(pos, lowerLimit, upperLimit);
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}
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m_data->m_jointMotors[i]->setPositionTarget(pos);
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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_motorTargetPositions[i]);
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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* ImportMJCFCreateFunc(struct CommonExampleOptions& options)
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{
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return new ImportMJCFSetup(options.m_guiHelper, options.m_option, options.m_fileName);
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}
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