mirror of
https://github.com/bulletphysics/bullet3
synced 2024-12-15 06:00:12 +00:00
467 lines
14 KiB
C++
467 lines
14 KiB
C++
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#include "InvertedPendulumPDControl.h"
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#include "BulletDynamics/Featherstone/btMultiBodyLinkCollider.h"
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#include "BulletDynamics/Featherstone/btMultiBodyJointFeedback.h"
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#include "../CommonInterfaces/CommonMultiBodyBase.h"
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#include "../Utils/b3ResourcePath.h"
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#include "../CommonInterfaces/CommonParameterInterface.h"
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static btScalar radius(0.2);
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static btScalar kp = 100;
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static btScalar kd = 20;
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static btScalar maxForce = 100;
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struct InvertedPendulumPDControl : public CommonMultiBodyBase
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{
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btMultiBody* m_multiBody;
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btAlignedObjectArray<btMultiBodyJointFeedback*> m_jointFeedbacks;
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bool m_once;
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int m_frameCount;
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public:
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InvertedPendulumPDControl(struct GUIHelperInterface* helper);
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virtual ~InvertedPendulumPDControl();
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virtual void initPhysics();
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virtual void stepSimulation(float deltaTime);
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virtual void resetCamera()
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{
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float dist = 5;
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float pitch = 270;
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float yaw = 21;
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float targetPos[3]={-1.34,3.4,-0.44};
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m_guiHelper->resetCamera(dist,pitch,yaw,targetPos[0],targetPos[1],targetPos[2]);
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}
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};
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InvertedPendulumPDControl::InvertedPendulumPDControl(struct GUIHelperInterface* helper)
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:CommonMultiBodyBase(helper),
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m_once(true),
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m_frameCount(0)
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{
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}
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InvertedPendulumPDControl::~InvertedPendulumPDControl()
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{
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}
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///this is a temporary global, until we determine if we need the option or not
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extern bool gJointFeedbackInWorldSpace;
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extern bool gJointFeedbackInJointFrame;
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btMultiBody* createInvertedPendulumMultiBody(btMultiBodyDynamicsWorld* world, GUIHelperInterface* guiHelper, const btTransform& baseWorldTrans)
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{
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btVector4 colors[4] =
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{
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btVector4(1,0,0,1),
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btVector4(0,1,0,1),
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btVector4(0,1,1,1),
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btVector4(1,1,0,1),
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};
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int curColor = 0;
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bool fixedBase = true;
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bool damping = false;
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bool gyro = false;
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int numLinks = 2;
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bool spherical = false; //set it ot false -to use 1DoF hinges instead of 3DoF sphericals
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bool canSleep = false;
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bool selfCollide = false;
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btVector3 linkHalfExtents(0.05, 0.37, 0.1);
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btVector3 baseHalfExtents(0.04, 0.35, 0.08);
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//mbC->forceMultiDof(); //if !spherical, you can comment this line to check the 1DoF algorithm
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//init the base
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btVector3 baseInertiaDiag(0.f, 0.f, 0.f);
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float baseMass = 0.f;
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if(baseMass)
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{
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//btCollisionShape *shape = new btSphereShape(baseHalfExtents[0]);// btBoxShape(btVector3(baseHalfExtents[0], baseHalfExtents[1], baseHalfExtents[2]));
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btCollisionShape *shape = new btBoxShape(btVector3(baseHalfExtents[0], baseHalfExtents[1], baseHalfExtents[2]));
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shape->calculateLocalInertia(baseMass, baseInertiaDiag);
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delete shape;
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}
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btMultiBody *pMultiBody = new btMultiBody(numLinks, 0, baseInertiaDiag, fixedBase, canSleep);
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pMultiBody->setBaseWorldTransform(baseWorldTrans);
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btVector3 vel(0, 0, 0);
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// pMultiBody->setBaseVel(vel);
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//init the links
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btVector3 hingeJointAxis(1, 0, 0);
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//y-axis assumed up
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btVector3 parentComToCurrentCom(0, -linkHalfExtents[1] * 2.f, 0); //par body's COM to cur body's COM offset
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btVector3 currentPivotToCurrentCom(0, -linkHalfExtents[1], 0); //cur body's COM to cur body's PIV offset
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btVector3 parentComToCurrentPivot = parentComToCurrentCom - currentPivotToCurrentCom; //par body's COM to cur body's PIV offset
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//////
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btScalar q0 = 1.f * SIMD_PI/ 180.f;
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btQuaternion quat0(btVector3(1, 0, 0).normalized(), q0);
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quat0.normalize();
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/////
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for(int i = 0; i < numLinks; ++i)
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{
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float linkMass = 1.f;
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//if (i==3 || i==2)
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// linkMass= 1000;
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btVector3 linkInertiaDiag(0.f, 0.f, 0.f);
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btCollisionShape* shape = 0;
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if (i==0)
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{
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shape = new btBoxShape(btVector3(linkHalfExtents[0], linkHalfExtents[1], linkHalfExtents[2]));//
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} else
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{
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shape = new btSphereShape(radius);
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}
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shape->calculateLocalInertia(linkMass, linkInertiaDiag);
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delete shape;
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if(!spherical)
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{
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//pMultiBody->setupRevolute(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f), hingeJointAxis, parentComToCurrentPivot, currentPivotToCurrentCom, false);
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if (i==0)
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{
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pMultiBody->setupRevolute(i, linkMass, linkInertiaDiag, i - 1,
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btQuaternion(0.f, 0.f, 0.f, 1.f),
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hingeJointAxis,
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parentComToCurrentPivot,
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currentPivotToCurrentCom, false);
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} else
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{
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btVector3 parentComToCurrentCom(0, -radius * 2.f, 0); //par body's COM to cur body's COM offset
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btVector3 currentPivotToCurrentCom(0, -radius, 0); //cur body's COM to cur body's PIV offset
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btVector3 parentComToCurrentPivot = parentComToCurrentCom - currentPivotToCurrentCom; //par body's COM to cur body's PIV offset
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pMultiBody->setupFixed(i, linkMass, linkInertiaDiag, i - 1,
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btQuaternion(0.f, 0.f, 0.f, 1.f),
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parentComToCurrentPivot,
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currentPivotToCurrentCom);
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}
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//pMultiBody->setupFixed(i,linkMass,linkInertiaDiag,i-1,btQuaternion(0,0,0,1),parentComToCurrentPivot,currentPivotToCurrentCom,false);
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}
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else
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{
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//pMultiBody->setupPlanar(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f)/*quat0*/, btVector3(1, 0, 0), parentComToCurrentPivot*2, false);
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pMultiBody->setupSpherical(i, linkMass, linkInertiaDiag, i - 1, btQuaternion(0.f, 0.f, 0.f, 1.f), parentComToCurrentPivot, currentPivotToCurrentCom, false);
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}
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}
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pMultiBody->finalizeMultiDof();
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///
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world->addMultiBody(pMultiBody);
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btMultiBody* mbC = pMultiBody;
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mbC->setCanSleep(canSleep);
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mbC->setHasSelfCollision(selfCollide);
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mbC->setUseGyroTerm(gyro);
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//
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if(!damping)
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{
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mbC->setLinearDamping(0.f);
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mbC->setAngularDamping(0.f);
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}else
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{ mbC->setLinearDamping(0.1f);
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mbC->setAngularDamping(0.9f);
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}
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//
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//////////////////////////////////////////////
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if(numLinks > 0)
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{
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btScalar q0 = 180.f * SIMD_PI/ 180.f;
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if(!spherical)
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{
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mbC->setJointPosMultiDof(0, &q0);
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}
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else
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{
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btQuaternion quat0(btVector3(1, 1, 0).normalized(), q0);
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quat0.normalize();
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mbC->setJointPosMultiDof(0, quat0);
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}
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}
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///
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btAlignedObjectArray<btQuaternion> world_to_local;
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world_to_local.resize(pMultiBody->getNumLinks() + 1);
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btAlignedObjectArray<btVector3> local_origin;
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local_origin.resize(pMultiBody->getNumLinks() + 1);
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world_to_local[0] = pMultiBody->getWorldToBaseRot();
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local_origin[0] = pMultiBody->getBasePos();
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double friction = 1;
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{
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// float pos[4]={local_origin[0].x(),local_origin[0].y(),local_origin[0].z(),1};
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float quat[4]={-world_to_local[0].x(),-world_to_local[0].y(),-world_to_local[0].z(),world_to_local[0].w()};
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if (1)
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{
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btCollisionShape* shape = new btBoxShape(btVector3(baseHalfExtents[0],baseHalfExtents[1],baseHalfExtents[2]));//new btSphereShape(baseHalfExtents[0]);
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guiHelper->createCollisionShapeGraphicsObject(shape);
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btMultiBodyLinkCollider* col= new btMultiBodyLinkCollider(pMultiBody, -1);
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col->setCollisionShape(shape);
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btTransform tr;
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tr.setIdentity();
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//if we don't set the initial pose of the btCollisionObject, the simulator will do this
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//when syncing the btMultiBody link transforms to the btMultiBodyLinkCollider
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tr.setOrigin(local_origin[0]);
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btQuaternion orn(btVector3(0,0,1),0.25*3.1415926538);
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tr.setRotation(orn);
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col->setWorldTransform(tr);
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bool isDynamic = (baseMass > 0 && !fixedBase);
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short collisionFilterGroup = isDynamic? short(btBroadphaseProxy::DefaultFilter) : short(btBroadphaseProxy::StaticFilter);
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short collisionFilterMask = isDynamic? short(btBroadphaseProxy::AllFilter) : short(btBroadphaseProxy::AllFilter ^ btBroadphaseProxy::StaticFilter);
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world->addCollisionObject(col,collisionFilterGroup,collisionFilterMask);//, 2,1+2);
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btVector3 color(0.0,0.0,0.5);
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guiHelper->createCollisionObjectGraphicsObject(col,color);
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// col->setFriction(friction);
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pMultiBody->setBaseCollider(col);
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}
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}
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for (int i=0; i < pMultiBody->getNumLinks(); ++i)
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{
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const int parent = pMultiBody->getParent(i);
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world_to_local[i+1] = pMultiBody->getParentToLocalRot(i) * world_to_local[parent+1];
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local_origin[i+1] = local_origin[parent+1] + (quatRotate(world_to_local[i+1].inverse() , pMultiBody->getRVector(i)));
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}
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for (int i=0; i < pMultiBody->getNumLinks(); ++i)
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{
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btVector3 posr = local_origin[i+1];
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// float pos[4]={posr.x(),posr.y(),posr.z(),1};
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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()};
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btCollisionShape* shape =0;
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if (i==0)
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{
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shape = new btBoxShape(btVector3(linkHalfExtents[0],linkHalfExtents[1],linkHalfExtents[2]));//btSphereShape(linkHalfExtents[0]);
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} else
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{
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shape = new btSphereShape(radius);
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}
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guiHelper->createCollisionShapeGraphicsObject(shape);
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btMultiBodyLinkCollider* col = new btMultiBodyLinkCollider(pMultiBody, i);
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col->setCollisionShape(shape);
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btTransform tr;
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tr.setIdentity();
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tr.setOrigin(posr);
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tr.setRotation(btQuaternion(quat[0],quat[1],quat[2],quat[3]));
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col->setWorldTransform(tr);
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// col->setFriction(friction);
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bool isDynamic = 1;//(linkMass > 0);
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short collisionFilterGroup = isDynamic? short(btBroadphaseProxy::DefaultFilter) : short(btBroadphaseProxy::StaticFilter);
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short collisionFilterMask = isDynamic? short(btBroadphaseProxy::AllFilter) : short(btBroadphaseProxy::AllFilter ^ btBroadphaseProxy::StaticFilter);
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//if (i==0||i>numLinks-2)
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{
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world->addCollisionObject(col,collisionFilterGroup,collisionFilterMask);//,2,1+2);
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btVector4 color = colors[curColor];
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curColor++;
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curColor&=3;
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guiHelper->createCollisionObjectGraphicsObject(col,color);
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pMultiBody->getLink(i).m_collider=col;
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}
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}
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return pMultiBody;
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}
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void InvertedPendulumPDControl::initPhysics()
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{
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{
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SliderParams slider("Kp",&kp);
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slider.m_minVal=-200;
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slider.m_maxVal=200;
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m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
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}
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{
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SliderParams slider("Kd",&kd);
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slider.m_minVal=-50;
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slider.m_maxVal=50;
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m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
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}
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{
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SliderParams slider("max force",&maxForce);
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slider.m_minVal=0;
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slider.m_maxVal=100;
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m_guiHelper->getParameterInterface()->registerSliderFloatParameter(slider);
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}
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int upAxis = 1;
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gJointFeedbackInWorldSpace = true;
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gJointFeedbackInJointFrame = true;
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m_guiHelper->setUpAxis(upAxis);
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this->createEmptyDynamicsWorld();
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m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
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m_dynamicsWorld->getDebugDrawer()->setDebugMode(
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//btIDebugDraw::DBG_DrawConstraints
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+btIDebugDraw::DBG_DrawWireframe
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+btIDebugDraw::DBG_DrawContactPoints
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+btIDebugDraw::DBG_DrawAabb
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);//+btIDebugDraw::DBG_DrawConstraintLimits);
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m_dynamicsWorld->setGravity(btVector3(0,-10,0));
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btTransform baseWorldTrans;
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baseWorldTrans.setIdentity();
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baseWorldTrans.setOrigin(btVector3(1,2,3));
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m_multiBody = createInvertedPendulumMultiBody(m_dynamicsWorld, m_guiHelper, baseWorldTrans);
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//for (int i=pMultiBody->getNumLinks()-1;i>=0;i--)//
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for (int i=0;i<m_multiBody->getNumLinks();i++)
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{
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btMultiBodyJointFeedback* fb = new btMultiBodyJointFeedback();
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m_multiBody->getLink(i).m_jointFeedback = fb;
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m_jointFeedbacks.push_back(fb);
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//break;
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}
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}
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char fileName[1024];
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static btAlignedObjectArray<btScalar> qDesiredArray;
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void InvertedPendulumPDControl::stepSimulation(float deltaTime)
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{
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static btScalar offset = -0.1*SIMD_PI;
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m_frameCount++;
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if ((m_frameCount&0xff)==0 )
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{
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offset = -offset;
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}
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btScalar target= SIMD_PI+offset;
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qDesiredArray.resize(0);
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qDesiredArray.resize(m_multiBody->getNumLinks(),target);
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for (int joint = 0; joint<m_multiBody->getNumLinks();joint++)
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{
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int dof1 = 0;
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btScalar qActual = m_multiBody->getJointPosMultiDof(joint)[dof1];
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btScalar qdActual = m_multiBody->getJointVelMultiDof(joint)[dof1];
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btScalar positionError = (qDesiredArray[joint]-qActual);
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double desiredVelocity = 0;
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btScalar velocityError = (desiredVelocity-qdActual);
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btScalar force = kp * positionError + kd*velocityError;
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btClamp(force,-maxForce,maxForce);
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m_multiBody->addJointTorque(joint, force);
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}
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if (m_frameCount==100)
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{
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const char* gPngFileName = "pendulum";
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if (gPngFileName)
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{
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//printf("gPngFileName=%s\n",gPngFileName);
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sprintf(fileName,"%s%d.png",gPngFileName,m_frameCount);
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b3Printf("Made screenshot %s",fileName);
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this->m_guiHelper->getAppInterface()->dumpNextFrameToPng(fileName);
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}
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}
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m_dynamicsWorld->stepSimulation(1./60.,0);//240,0);
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static int count = 0;
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if ((count& 0x0f)==0)
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{
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#if 0
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for (int i=0;i<m_jointFeedbacks.size();i++)
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{
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b3Printf("F_reaction[%i] linear:%f,%f,%f, angular:%f,%f,%f",
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i,
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m_jointFeedbacks[i]->m_reactionForces.m_topVec[0],
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m_jointFeedbacks[i]->m_reactionForces.m_topVec[1],
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m_jointFeedbacks[i]->m_reactionForces.m_topVec[2],
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m_jointFeedbacks[i]->m_reactionForces.m_bottomVec[0],
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m_jointFeedbacks[i]->m_reactionForces.m_bottomVec[1],
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m_jointFeedbacks[i]->m_reactionForces.m_bottomVec[2]
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);
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}
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#endif
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}
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count++;
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/*
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b3Printf("base angvel = %f,%f,%f",m_multiBody->getBaseOmega()[0],
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m_multiBody->getBaseOmega()[1],
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m_multiBody->getBaseOmega()[2]
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);
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*/
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btScalar jointVel =m_multiBody->getJointVel(0);
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// b3Printf("child angvel = %f",jointVel);
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}
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class CommonExampleInterface* InvertedPendulumPDControlCreateFunc(struct CommonExampleOptions& options)
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{
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return new InvertedPendulumPDControl(options.m_guiHelper);
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}
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