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Diffstat (limited to 'thirdparty/bullet/src/BulletDynamics/Featherstone/btMultiBody.cpp')
| -rw-r--r-- | thirdparty/bullet/src/BulletDynamics/Featherstone/btMultiBody.cpp | 2043 |
1 files changed, 0 insertions, 2043 deletions
diff --git a/thirdparty/bullet/src/BulletDynamics/Featherstone/btMultiBody.cpp b/thirdparty/bullet/src/BulletDynamics/Featherstone/btMultiBody.cpp deleted file mode 100644 index 62865e0c78..0000000000 --- a/thirdparty/bullet/src/BulletDynamics/Featherstone/btMultiBody.cpp +++ /dev/null @@ -1,2043 +0,0 @@ -/* - * PURPOSE: - * Class representing an articulated rigid body. Stores the body's - * current state, allows forces and torques to be set, handles - * timestepping and implements Featherstone's algorithm. - * - * COPYRIGHT: - * Copyright (C) Stephen Thompson, <stephen@solarflare.org.uk>, 2011-2013 - * Portions written By Erwin Coumans: connection to LCP solver, various multibody constraints, replacing Eigen math library by Bullet LinearMath and a dedicated 6x6 matrix inverse (solveImatrix) - * Portions written By Jakub Stepien: support for multi-DOF constraints, introduction of spatial algebra and several other improvements - - This software is provided 'as-is', without any express or implied warranty. - In no event will the authors be held liable for any damages arising from the use of this software. - Permission is granted to anyone to use this software for any purpose, - including commercial applications, and to alter it and redistribute it freely, - subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. - 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. - 3. This notice may not be removed or altered from any source distribution. - - */ - - -#include "btMultiBody.h" -#include "btMultiBodyLink.h" -#include "btMultiBodyLinkCollider.h" -#include "btMultiBodyJointFeedback.h" -#include "LinearMath/btTransformUtil.h" -#include "LinearMath/btSerializer.h" -//#include "Bullet3Common/b3Logging.h" -// #define INCLUDE_GYRO_TERM - -///todo: determine if we need these options. If so, make a proper API, otherwise delete those globals -bool gJointFeedbackInWorldSpace = false; -bool gJointFeedbackInJointFrame = false; - -namespace { - const btScalar SLEEP_EPSILON = btScalar(0.05); // this is a squared velocity (m^2 s^-2) - const btScalar SLEEP_TIMEOUT = btScalar(2); // in seconds -} - -namespace { - void SpatialTransform(const btMatrix3x3 &rotation_matrix, // rotates vectors in 'from' frame to vectors in 'to' frame - const btVector3 &displacement, // vector from origin of 'from' frame to origin of 'to' frame, in 'to' coordinates - const btVector3 &top_in, // top part of input vector - const btVector3 &bottom_in, // bottom part of input vector - btVector3 &top_out, // top part of output vector - btVector3 &bottom_out) // bottom part of output vector - { - top_out = rotation_matrix * top_in; - bottom_out = -displacement.cross(top_out) + rotation_matrix * bottom_in; - } - -#if 0 - void InverseSpatialTransform(const btMatrix3x3 &rotation_matrix, - const btVector3 &displacement, - const btVector3 &top_in, - const btVector3 &bottom_in, - btVector3 &top_out, - btVector3 &bottom_out) - { - top_out = rotation_matrix.transpose() * top_in; - bottom_out = rotation_matrix.transpose() * (bottom_in + displacement.cross(top_in)); - } - - btScalar SpatialDotProduct(const btVector3 &a_top, - const btVector3 &a_bottom, - const btVector3 &b_top, - const btVector3 &b_bottom) - { - return a_bottom.dot(b_top) + a_top.dot(b_bottom); - } - - void SpatialCrossProduct(const btVector3 &a_top, - const btVector3 &a_bottom, - const btVector3 &b_top, - const btVector3 &b_bottom, - btVector3 &top_out, - btVector3 &bottom_out) - { - top_out = a_top.cross(b_top); - bottom_out = a_bottom.cross(b_top) + a_top.cross(b_bottom); - } -#endif - -} - - -// -// Implementation of class btMultiBody -// - -btMultiBody::btMultiBody(int n_links, - btScalar mass, - const btVector3 &inertia, - bool fixedBase, - bool canSleep, - bool /*deprecatedUseMultiDof*/) - : - m_baseCollider(0), - m_baseName(0), - m_basePos(0,0,0), - m_baseQuat(0, 0, 0, 1), - m_baseMass(mass), - m_baseInertia(inertia), - - m_fixedBase(fixedBase), - m_awake(true), - m_canSleep(canSleep), - m_sleepTimer(0), - m_userObjectPointer(0), - m_userIndex2(-1), - m_userIndex(-1), - m_linearDamping(0.04f), - m_angularDamping(0.04f), - m_useGyroTerm(true), - m_maxAppliedImpulse(1000.f), - m_maxCoordinateVelocity(100.f), - m_hasSelfCollision(true), - __posUpdated(false), - m_dofCount(0), - m_posVarCnt(0), - m_useRK4(false), - m_useGlobalVelocities(false), - m_internalNeedsJointFeedback(false) -{ - m_cachedInertiaTopLeft.setValue(0,0,0,0,0,0,0,0,0); - m_cachedInertiaTopRight.setValue(0,0,0,0,0,0,0,0,0); - m_cachedInertiaLowerLeft.setValue(0,0,0,0,0,0,0,0,0); - m_cachedInertiaLowerRight.setValue(0,0,0,0,0,0,0,0,0); - m_cachedInertiaValid=false; - - m_links.resize(n_links); - m_matrixBuf.resize(n_links + 1); - - m_baseForce.setValue(0, 0, 0); - m_baseTorque.setValue(0, 0, 0); -} - -btMultiBody::~btMultiBody() -{ -} - -void btMultiBody::setupFixed(int i, - btScalar mass, - const btVector3 &inertia, - int parent, - const btQuaternion &rotParentToThis, - const btVector3 &parentComToThisPivotOffset, - const btVector3 &thisPivotToThisComOffset, bool /*deprecatedDisableParentCollision*/) -{ - - m_links[i].m_mass = mass; - m_links[i].m_inertiaLocal = inertia; - m_links[i].m_parent = parent; - m_links[i].setAxisTop(0, 0., 0., 0.); - m_links[i].setAxisBottom(0, btVector3(0,0,0)); - m_links[i].m_zeroRotParentToThis = rotParentToThis; - m_links[i].m_dVector = thisPivotToThisComOffset; - m_links[i].m_eVector = parentComToThisPivotOffset; - - m_links[i].m_jointType = btMultibodyLink::eFixed; - m_links[i].m_dofCount = 0; - m_links[i].m_posVarCount = 0; - - m_links[i].m_flags |=BT_MULTIBODYLINKFLAGS_DISABLE_PARENT_COLLISION; - - m_links[i].updateCacheMultiDof(); - - updateLinksDofOffsets(); - -} - - -void btMultiBody::setupPrismatic(int i, - btScalar mass, - const btVector3 &inertia, - int parent, - const btQuaternion &rotParentToThis, - const btVector3 &jointAxis, - const btVector3 &parentComToThisPivotOffset, - const btVector3 &thisPivotToThisComOffset, - bool disableParentCollision) -{ - m_dofCount += 1; - m_posVarCnt += 1; - - m_links[i].m_mass = mass; - m_links[i].m_inertiaLocal = inertia; - m_links[i].m_parent = parent; - m_links[i].m_zeroRotParentToThis = rotParentToThis; - m_links[i].setAxisTop(0, 0., 0., 0.); - m_links[i].setAxisBottom(0, jointAxis); - m_links[i].m_eVector = parentComToThisPivotOffset; - m_links[i].m_dVector = thisPivotToThisComOffset; - m_links[i].m_cachedRotParentToThis = rotParentToThis; - - m_links[i].m_jointType = btMultibodyLink::ePrismatic; - m_links[i].m_dofCount = 1; - m_links[i].m_posVarCount = 1; - m_links[i].m_jointPos[0] = 0.f; - m_links[i].m_jointTorque[0] = 0.f; - - if (disableParentCollision) - m_links[i].m_flags |=BT_MULTIBODYLINKFLAGS_DISABLE_PARENT_COLLISION; - // - - m_links[i].updateCacheMultiDof(); - - updateLinksDofOffsets(); -} - -void btMultiBody::setupRevolute(int i, - btScalar mass, - const btVector3 &inertia, - int parent, - const btQuaternion &rotParentToThis, - const btVector3 &jointAxis, - const btVector3 &parentComToThisPivotOffset, - const btVector3 &thisPivotToThisComOffset, - bool disableParentCollision) -{ - m_dofCount += 1; - m_posVarCnt += 1; - - m_links[i].m_mass = mass; - m_links[i].m_inertiaLocal = inertia; - m_links[i].m_parent = parent; - m_links[i].m_zeroRotParentToThis = rotParentToThis; - m_links[i].setAxisTop(0, jointAxis); - m_links[i].setAxisBottom(0, jointAxis.cross(thisPivotToThisComOffset)); - m_links[i].m_dVector = thisPivotToThisComOffset; - m_links[i].m_eVector = parentComToThisPivotOffset; - - m_links[i].m_jointType = btMultibodyLink::eRevolute; - m_links[i].m_dofCount = 1; - m_links[i].m_posVarCount = 1; - m_links[i].m_jointPos[0] = 0.f; - m_links[i].m_jointTorque[0] = 0.f; - - if (disableParentCollision) - m_links[i].m_flags |=BT_MULTIBODYLINKFLAGS_DISABLE_PARENT_COLLISION; - // - m_links[i].updateCacheMultiDof(); - // - updateLinksDofOffsets(); -} - - - -void btMultiBody::setupSpherical(int i, - btScalar mass, - const btVector3 &inertia, - int parent, - const btQuaternion &rotParentToThis, - const btVector3 &parentComToThisPivotOffset, - const btVector3 &thisPivotToThisComOffset, - bool disableParentCollision) -{ - - m_dofCount += 3; - m_posVarCnt += 4; - - m_links[i].m_mass = mass; - m_links[i].m_inertiaLocal = inertia; - m_links[i].m_parent = parent; - m_links[i].m_zeroRotParentToThis = rotParentToThis; - m_links[i].m_dVector = thisPivotToThisComOffset; - m_links[i].m_eVector = parentComToThisPivotOffset; - - m_links[i].m_jointType = btMultibodyLink::eSpherical; - m_links[i].m_dofCount = 3; - m_links[i].m_posVarCount = 4; - m_links[i].setAxisTop(0, 1.f, 0.f, 0.f); - m_links[i].setAxisTop(1, 0.f, 1.f, 0.f); - m_links[i].setAxisTop(2, 0.f, 0.f, 1.f); - m_links[i].setAxisBottom(0, m_links[i].getAxisTop(0).cross(thisPivotToThisComOffset)); - m_links[i].setAxisBottom(1, m_links[i].getAxisTop(1).cross(thisPivotToThisComOffset)); - m_links[i].setAxisBottom(2, m_links[i].getAxisTop(2).cross(thisPivotToThisComOffset)); - m_links[i].m_jointPos[0] = m_links[i].m_jointPos[1] = m_links[i].m_jointPos[2] = 0.f; m_links[i].m_jointPos[3] = 1.f; - m_links[i].m_jointTorque[0] = m_links[i].m_jointTorque[1] = m_links[i].m_jointTorque[2] = 0.f; - - - if (disableParentCollision) - m_links[i].m_flags |=BT_MULTIBODYLINKFLAGS_DISABLE_PARENT_COLLISION; - // - m_links[i].updateCacheMultiDof(); - // - updateLinksDofOffsets(); -} - -void btMultiBody::setupPlanar(int i, - btScalar mass, - const btVector3 &inertia, - int parent, - const btQuaternion &rotParentToThis, - const btVector3 &rotationAxis, - const btVector3 &parentComToThisComOffset, - bool disableParentCollision) -{ - - m_dofCount += 3; - m_posVarCnt += 3; - - m_links[i].m_mass = mass; - m_links[i].m_inertiaLocal = inertia; - m_links[i].m_parent = parent; - m_links[i].m_zeroRotParentToThis = rotParentToThis; - m_links[i].m_dVector.setZero(); - m_links[i].m_eVector = parentComToThisComOffset; - - // - btVector3 vecNonParallelToRotAxis(1, 0, 0); - if(rotationAxis.normalized().dot(vecNonParallelToRotAxis) > 0.999) - vecNonParallelToRotAxis.setValue(0, 1, 0); - // - - m_links[i].m_jointType = btMultibodyLink::ePlanar; - m_links[i].m_dofCount = 3; - m_links[i].m_posVarCount = 3; - btVector3 n=rotationAxis.normalized(); - m_links[i].setAxisTop(0, n[0],n[1],n[2]); - m_links[i].setAxisTop(1,0,0,0); - m_links[i].setAxisTop(2,0,0,0); - m_links[i].setAxisBottom(0,0,0,0); - btVector3 cr = m_links[i].getAxisTop(0).cross(vecNonParallelToRotAxis); - m_links[i].setAxisBottom(1,cr[0],cr[1],cr[2]); - cr = m_links[i].getAxisBottom(1).cross(m_links[i].getAxisTop(0)); - m_links[i].setAxisBottom(2,cr[0],cr[1],cr[2]); - m_links[i].m_jointPos[0] = m_links[i].m_jointPos[1] = m_links[i].m_jointPos[2] = 0.f; - m_links[i].m_jointTorque[0] = m_links[i].m_jointTorque[1] = m_links[i].m_jointTorque[2] = 0.f; - - if (disableParentCollision) - m_links[i].m_flags |=BT_MULTIBODYLINKFLAGS_DISABLE_PARENT_COLLISION; - // - m_links[i].updateCacheMultiDof(); - // - updateLinksDofOffsets(); -} - -void btMultiBody::finalizeMultiDof() -{ - m_deltaV.resize(0); - m_deltaV.resize(6 + m_dofCount); - m_realBuf.resize(6 + m_dofCount + m_dofCount*m_dofCount + 6 + m_dofCount); //m_dofCount for joint-space vels + m_dofCount^2 for "D" matrices + delta-pos vector (6 base "vels" + joint "vels") - m_vectorBuf.resize(2 * m_dofCount); //two 3-vectors (i.e. one six-vector) for each system dof ("h" matrices) - for (int i=0;i<m_vectorBuf.size();i++) - { - m_vectorBuf[i].setValue(0,0,0); - } - updateLinksDofOffsets(); -} - -int btMultiBody::getParent(int i) const -{ - return m_links[i].m_parent; -} - -btScalar btMultiBody::getLinkMass(int i) const -{ - return m_links[i].m_mass; -} - -const btVector3 & btMultiBody::getLinkInertia(int i) const -{ - return m_links[i].m_inertiaLocal; -} - -btScalar btMultiBody::getJointPos(int i) const -{ - return m_links[i].m_jointPos[0]; -} - -btScalar btMultiBody::getJointVel(int i) const -{ - return m_realBuf[6 + m_links[i].m_dofOffset]; -} - -btScalar * btMultiBody::getJointPosMultiDof(int i) -{ - return &m_links[i].m_jointPos[0]; -} - -btScalar * btMultiBody::getJointVelMultiDof(int i) -{ - return &m_realBuf[6 + m_links[i].m_dofOffset]; -} - -const btScalar * btMultiBody::getJointPosMultiDof(int i) const -{ - return &m_links[i].m_jointPos[0]; -} - -const btScalar * btMultiBody::getJointVelMultiDof(int i) const -{ - return &m_realBuf[6 + m_links[i].m_dofOffset]; -} - - -void btMultiBody::setJointPos(int i, btScalar q) -{ - m_links[i].m_jointPos[0] = q; - m_links[i].updateCacheMultiDof(); -} - -void btMultiBody::setJointPosMultiDof(int i, btScalar *q) -{ - for(int pos = 0; pos < m_links[i].m_posVarCount; ++pos) - m_links[i].m_jointPos[pos] = q[pos]; - - m_links[i].updateCacheMultiDof(); -} - -void btMultiBody::setJointVel(int i, btScalar qdot) -{ - m_realBuf[6 + m_links[i].m_dofOffset] = qdot; -} - -void btMultiBody::setJointVelMultiDof(int i, btScalar *qdot) -{ - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - m_realBuf[6 + m_links[i].m_dofOffset + dof] = qdot[dof]; -} - -const btVector3 & btMultiBody::getRVector(int i) const -{ - return m_links[i].m_cachedRVector; -} - -const btQuaternion & btMultiBody::getParentToLocalRot(int i) const -{ - return m_links[i].m_cachedRotParentToThis; -} - -btVector3 btMultiBody::localPosToWorld(int i, const btVector3 &local_pos) const -{ - btAssert(i>=-1); - btAssert(i<m_links.size()); - if ((i<-1) || (i>=m_links.size())) - { - return btVector3(SIMD_INFINITY,SIMD_INFINITY,SIMD_INFINITY); - } - - btVector3 result = local_pos; - while (i != -1) { - // 'result' is in frame i. transform it to frame parent(i) - result += getRVector(i); - result = quatRotate(getParentToLocalRot(i).inverse(),result); - i = getParent(i); - } - - // 'result' is now in the base frame. transform it to world frame - result = quatRotate(getWorldToBaseRot().inverse() ,result); - result += getBasePos(); - - return result; -} - -btVector3 btMultiBody::worldPosToLocal(int i, const btVector3 &world_pos) const -{ - btAssert(i>=-1); - btAssert(i<m_links.size()); - if ((i<-1) || (i>=m_links.size())) - { - return btVector3(SIMD_INFINITY,SIMD_INFINITY,SIMD_INFINITY); - } - - if (i == -1) { - // world to base - return quatRotate(getWorldToBaseRot(),(world_pos - getBasePos())); - } else { - // find position in parent frame, then transform to current frame - return quatRotate(getParentToLocalRot(i),worldPosToLocal(getParent(i), world_pos)) - getRVector(i); - } -} - -btVector3 btMultiBody::localDirToWorld(int i, const btVector3 &local_dir) const -{ - btAssert(i>=-1); - btAssert(i<m_links.size()); - if ((i<-1) || (i>=m_links.size())) - { - return btVector3(SIMD_INFINITY,SIMD_INFINITY,SIMD_INFINITY); - } - - - btVector3 result = local_dir; - while (i != -1) { - result = quatRotate(getParentToLocalRot(i).inverse() , result); - i = getParent(i); - } - result = quatRotate(getWorldToBaseRot().inverse() , result); - return result; -} - -btVector3 btMultiBody::worldDirToLocal(int i, const btVector3 &world_dir) const -{ - btAssert(i>=-1); - btAssert(i<m_links.size()); - if ((i<-1) || (i>=m_links.size())) - { - return btVector3(SIMD_INFINITY,SIMD_INFINITY,SIMD_INFINITY); - } - - if (i == -1) { - return quatRotate(getWorldToBaseRot(), world_dir); - } else { - return quatRotate(getParentToLocalRot(i) ,worldDirToLocal(getParent(i), world_dir)); - } -} - -btMatrix3x3 btMultiBody::localFrameToWorld(int i, const btMatrix3x3 &local_frame) const -{ - btMatrix3x3 result = local_frame; - btVector3 frameInWorld0 = localDirToWorld(i, local_frame.getColumn(0)); - btVector3 frameInWorld1 = localDirToWorld(i, local_frame.getColumn(1)); - btVector3 frameInWorld2 = localDirToWorld(i, local_frame.getColumn(2)); - result.setValue(frameInWorld0[0], frameInWorld1[0], frameInWorld2[0], frameInWorld0[1], frameInWorld1[1], frameInWorld2[1], frameInWorld0[2], frameInWorld1[2], frameInWorld2[2]); - return result; -} - -void btMultiBody::compTreeLinkVelocities(btVector3 *omega, btVector3 *vel) const -{ - int num_links = getNumLinks(); - // Calculates the velocities of each link (and the base) in its local frame - omega[0] = quatRotate(m_baseQuat ,getBaseOmega()); - vel[0] = quatRotate(m_baseQuat ,getBaseVel()); - - for (int i = 0; i < num_links; ++i) - { - const int parent = m_links[i].m_parent; - - // transform parent vel into this frame, store in omega[i+1], vel[i+1] - SpatialTransform(btMatrix3x3(m_links[i].m_cachedRotParentToThis), m_links[i].m_cachedRVector, - omega[parent+1], vel[parent+1], - omega[i+1], vel[i+1]); - - // now add qidot * shat_i - //only supported for revolute/prismatic joints, todo: spherical and planar joints - switch(m_links[i].m_jointType) - { - case btMultibodyLink::ePrismatic: - case btMultibodyLink::eRevolute: - { - btVector3 axisTop = m_links[i].getAxisTop(0); - btVector3 axisBottom = m_links[i].getAxisBottom(0); - btScalar jointVel = getJointVel(i); - omega[i+1] += jointVel * axisTop; - vel[i+1] += jointVel * axisBottom; - break; - } - default: - { - } - } - } -} - -btScalar btMultiBody::getKineticEnergy() const -{ - int num_links = getNumLinks(); - // TODO: would be better not to allocate memory here - btAlignedObjectArray<btVector3> omega;omega.resize(num_links+1); - btAlignedObjectArray<btVector3> vel;vel.resize(num_links+1); - compTreeLinkVelocities(&omega[0], &vel[0]); - - // we will do the factor of 0.5 at the end - btScalar result = m_baseMass * vel[0].dot(vel[0]); - result += omega[0].dot(m_baseInertia * omega[0]); - - for (int i = 0; i < num_links; ++i) { - result += m_links[i].m_mass * vel[i+1].dot(vel[i+1]); - result += omega[i+1].dot(m_links[i].m_inertiaLocal * omega[i+1]); - } - - return 0.5f * result; -} - -btVector3 btMultiBody::getAngularMomentum() const -{ - int num_links = getNumLinks(); - // TODO: would be better not to allocate memory here - btAlignedObjectArray<btVector3> omega;omega.resize(num_links+1); - btAlignedObjectArray<btVector3> vel;vel.resize(num_links+1); - btAlignedObjectArray<btQuaternion> rot_from_world;rot_from_world.resize(num_links+1); - compTreeLinkVelocities(&omega[0], &vel[0]); - - rot_from_world[0] = m_baseQuat; - btVector3 result = quatRotate(rot_from_world[0].inverse() , (m_baseInertia * omega[0])); - - for (int i = 0; i < num_links; ++i) { - rot_from_world[i+1] = m_links[i].m_cachedRotParentToThis * rot_from_world[m_links[i].m_parent+1]; - result += (quatRotate(rot_from_world[i+1].inverse() , (m_links[i].m_inertiaLocal * omega[i+1]))); - } - - return result; -} - -void btMultiBody::clearConstraintForces() -{ - m_baseConstraintForce.setValue(0, 0, 0); - m_baseConstraintTorque.setValue(0, 0, 0); - - - for (int i = 0; i < getNumLinks(); ++i) { - m_links[i].m_appliedConstraintForce.setValue(0, 0, 0); - m_links[i].m_appliedConstraintTorque.setValue(0, 0, 0); - } -} -void btMultiBody::clearForcesAndTorques() -{ - m_baseForce.setValue(0, 0, 0); - m_baseTorque.setValue(0, 0, 0); - - - for (int i = 0; i < getNumLinks(); ++i) { - m_links[i].m_appliedForce.setValue(0, 0, 0); - m_links[i].m_appliedTorque.setValue(0, 0, 0); - m_links[i].m_jointTorque[0] = m_links[i].m_jointTorque[1] = m_links[i].m_jointTorque[2] = m_links[i].m_jointTorque[3] = m_links[i].m_jointTorque[4] = m_links[i].m_jointTorque[5] = 0.f; - } -} - -void btMultiBody::clearVelocities() -{ - for (int i = 0; i < 6 + getNumDofs(); ++i) - { - m_realBuf[i] = 0.f; - } -} -void btMultiBody::addLinkForce(int i, const btVector3 &f) -{ - m_links[i].m_appliedForce += f; -} - -void btMultiBody::addLinkTorque(int i, const btVector3 &t) -{ - m_links[i].m_appliedTorque += t; -} - -void btMultiBody::addLinkConstraintForce(int i, const btVector3 &f) -{ - m_links[i].m_appliedConstraintForce += f; -} - -void btMultiBody::addLinkConstraintTorque(int i, const btVector3 &t) -{ - m_links[i].m_appliedConstraintTorque += t; -} - - - -void btMultiBody::addJointTorque(int i, btScalar Q) -{ - m_links[i].m_jointTorque[0] += Q; -} - -void btMultiBody::addJointTorqueMultiDof(int i, int dof, btScalar Q) -{ - m_links[i].m_jointTorque[dof] += Q; -} - -void btMultiBody::addJointTorqueMultiDof(int i, const btScalar *Q) -{ - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - m_links[i].m_jointTorque[dof] = Q[dof]; -} - -const btVector3 & btMultiBody::getLinkForce(int i) const -{ - return m_links[i].m_appliedForce; -} - -const btVector3 & btMultiBody::getLinkTorque(int i) const -{ - return m_links[i].m_appliedTorque; -} - -btScalar btMultiBody::getJointTorque(int i) const -{ - return m_links[i].m_jointTorque[0]; -} - -btScalar * btMultiBody::getJointTorqueMultiDof(int i) -{ - return &m_links[i].m_jointTorque[0]; -} - -inline btMatrix3x3 outerProduct(const btVector3& v0, const btVector3& v1) //renamed it from vecMulVecTranspose (http://en.wikipedia.org/wiki/Outer_product); maybe it should be moved to btVector3 like dot and cross? -{ - btVector3 row0 = btVector3( - v0.x() * v1.x(), - v0.x() * v1.y(), - v0.x() * v1.z()); - btVector3 row1 = btVector3( - v0.y() * v1.x(), - v0.y() * v1.y(), - v0.y() * v1.z()); - btVector3 row2 = btVector3( - v0.z() * v1.x(), - v0.z() * v1.y(), - v0.z() * v1.z()); - - btMatrix3x3 m(row0[0],row0[1],row0[2], - row1[0],row1[1],row1[2], - row2[0],row2[1],row2[2]); - return m; -} - -#define vecMulVecTranspose(v0, v1Transposed) outerProduct(v0, v1Transposed) -// - -void btMultiBody::computeAccelerationsArticulatedBodyAlgorithmMultiDof(btScalar dt, - btAlignedObjectArray<btScalar> &scratch_r, - btAlignedObjectArray<btVector3> &scratch_v, - btAlignedObjectArray<btMatrix3x3> &scratch_m, - bool isConstraintPass) -{ - // Implement Featherstone's algorithm to calculate joint accelerations (q_double_dot) - // and the base linear & angular accelerations. - - // We apply damping forces in this routine as well as any external forces specified by the - // caller (via addBaseForce etc). - - // output should point to an array of 6 + num_links reals. - // Format is: 3 angular accelerations (in world frame), 3 linear accelerations (in world frame), - // num_links joint acceleration values. - - // We added support for multi degree of freedom (multi dof) joints. - // In addition we also can compute the joint reaction forces. This is performed in a second pass, - // so that we can include the effect of the constraint solver forces (computed in the PGS LCP solver) - - m_internalNeedsJointFeedback = false; - - int num_links = getNumLinks(); - - const btScalar DAMPING_K1_LINEAR = m_linearDamping; - const btScalar DAMPING_K2_LINEAR = m_linearDamping; - - const btScalar DAMPING_K1_ANGULAR = m_angularDamping; - const btScalar DAMPING_K2_ANGULAR= m_angularDamping; - - btVector3 base_vel = getBaseVel(); - btVector3 base_omega = getBaseOmega(); - - // Temporary matrices/vectors -- use scratch space from caller - // so that we don't have to keep reallocating every frame - - scratch_r.resize(2*m_dofCount + 6); //multidof? ("Y"s use it and it is used to store qdd) => 2 x m_dofCount - scratch_v.resize(8*num_links + 6); - scratch_m.resize(4*num_links + 4); - - //btScalar * r_ptr = &scratch_r[0]; - btScalar * output = &scratch_r[m_dofCount]; // "output" holds the q_double_dot results - btVector3 * v_ptr = &scratch_v[0]; - - // vhat_i (top = angular, bottom = linear part) - btSpatialMotionVector *spatVel = (btSpatialMotionVector *)v_ptr; - v_ptr += num_links * 2 + 2; - // - // zhat_i^A - btSpatialForceVector * zeroAccSpatFrc = (btSpatialForceVector *)v_ptr; - v_ptr += num_links * 2 + 2; - // - // chat_i (note NOT defined for the base) - btSpatialMotionVector * spatCoriolisAcc = (btSpatialMotionVector *)v_ptr; - v_ptr += num_links * 2; - // - // Ihat_i^A. - btSymmetricSpatialDyad * spatInertia = (btSymmetricSpatialDyad *)&scratch_m[num_links + 1]; - - // Cached 3x3 rotation matrices from parent frame to this frame. - btMatrix3x3 * rot_from_parent = &m_matrixBuf[0]; - btMatrix3x3 * rot_from_world = &scratch_m[0]; - - // hhat_i, ahat_i - // hhat is NOT stored for the base (but ahat is) - btSpatialForceVector * h = (btSpatialForceVector *)(m_dofCount > 0 ? &m_vectorBuf[0] : 0); - btSpatialMotionVector * spatAcc = (btSpatialMotionVector *)v_ptr; - v_ptr += num_links * 2 + 2; - // - // Y_i, invD_i - btScalar * invD = m_dofCount > 0 ? &m_realBuf[6 + m_dofCount] : 0; - btScalar * Y = &scratch_r[0]; - // - //aux variables - btSpatialMotionVector spatJointVel; //spatial velocity due to the joint motion (i.e. without predecessors' influence) - btScalar D[36]; //"D" matrix; it's dofxdof for each body so asingle 6x6 D matrix will do - btScalar invD_times_Y[6]; //D^{-1} * Y [dofxdof x dofx1 = dofx1] <=> D^{-1} * u; better moved to buffers since it is recalced in calcAccelerationDeltasMultiDof; num_dof of btScalar would cover all bodies - btSpatialMotionVector result; //holds results of the SolveImatrix op; it is a spatial motion vector (accel) - btScalar Y_minus_hT_a[6]; //Y - h^{T} * a; it's dofx1 for each body so a single 6x1 temp is enough - btSpatialForceVector spatForceVecTemps[6]; //6 temporary spatial force vectors - btSpatialTransformationMatrix fromParent; //spatial transform from parent to child - btSymmetricSpatialDyad dyadTemp; //inertia matrix temp - btSpatialTransformationMatrix fromWorld; - fromWorld.m_trnVec.setZero(); - ///////////////// - - // ptr to the joint accel part of the output - btScalar * joint_accel = output + 6; - - // Start of the algorithm proper. - - // First 'upward' loop. - // Combines CompTreeLinkVelocities and InitTreeLinks from Mirtich. - - rot_from_parent[0] = btMatrix3x3(m_baseQuat); //m_baseQuat assumed to be alias!? - - //create the vector of spatial velocity of the base by transforming global-coor linear and angular velocities into base-local coordinates - spatVel[0].setVector(rot_from_parent[0] * base_omega, rot_from_parent[0] * base_vel); - - if (m_fixedBase) - { - zeroAccSpatFrc[0].setZero(); - } - else - { - btVector3 baseForce = isConstraintPass? m_baseConstraintForce : m_baseForce; - btVector3 baseTorque = isConstraintPass? m_baseConstraintTorque : m_baseTorque; - //external forces - zeroAccSpatFrc[0].setVector(-(rot_from_parent[0] * baseTorque), -(rot_from_parent[0] * baseForce)); - - //adding damping terms (only) - btScalar linDampMult = 1., angDampMult = 1.; - zeroAccSpatFrc[0].addVector(angDampMult * m_baseInertia * spatVel[0].getAngular() * (DAMPING_K1_ANGULAR + DAMPING_K2_ANGULAR * spatVel[0].getAngular().safeNorm()), - linDampMult * m_baseMass * spatVel[0].getLinear() * (DAMPING_K1_LINEAR + DAMPING_K2_LINEAR * spatVel[0].getLinear().safeNorm())); - - // - //p += vhat x Ihat vhat - done in a simpler way - if (m_useGyroTerm) - zeroAccSpatFrc[0].addAngular(spatVel[0].getAngular().cross(m_baseInertia * spatVel[0].getAngular())); - // - zeroAccSpatFrc[0].addLinear(m_baseMass * spatVel[0].getAngular().cross(spatVel[0].getLinear())); - } - - - //init the spatial AB inertia (it has the simple form thanks to choosing local body frames origins at their COMs) - spatInertia[0].setMatrix( btMatrix3x3(0,0,0,0,0,0,0,0,0), - // - btMatrix3x3(m_baseMass, 0, 0, - 0, m_baseMass, 0, - 0, 0, m_baseMass), - // - btMatrix3x3(m_baseInertia[0], 0, 0, - 0, m_baseInertia[1], 0, - 0, 0, m_baseInertia[2]) - ); - - rot_from_world[0] = rot_from_parent[0]; - - // - for (int i = 0; i < num_links; ++i) { - const int parent = m_links[i].m_parent; - rot_from_parent[i+1] = btMatrix3x3(m_links[i].m_cachedRotParentToThis); - rot_from_world[i+1] = rot_from_parent[i+1] * rot_from_world[parent+1]; - - fromParent.m_rotMat = rot_from_parent[i+1]; fromParent.m_trnVec = m_links[i].m_cachedRVector; - fromWorld.m_rotMat = rot_from_world[i+1]; - fromParent.transform(spatVel[parent+1], spatVel[i+1]); - - // now set vhat_i to its true value by doing - // vhat_i += qidot * shat_i - if(!m_useGlobalVelocities) - { - spatJointVel.setZero(); - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - spatJointVel += m_links[i].m_axes[dof] * getJointVelMultiDof(i)[dof]; - - // remember vhat_i is really vhat_p(i) (but in current frame) at this point => we need to add velocity across the inboard joint - spatVel[i+1] += spatJointVel; - - // - // vhat_i is vhat_p(i) transformed to local coors + the velocity across the i-th inboard joint - //spatVel[i+1] = fromParent * spatVel[parent+1] + spatJointVel; - - } - else - { - fromWorld.transformRotationOnly(m_links[i].m_absFrameTotVelocity, spatVel[i+1]); - fromWorld.transformRotationOnly(m_links[i].m_absFrameLocVelocity, spatJointVel); - } - - // we can now calculate chat_i - spatVel[i+1].cross(spatJointVel, spatCoriolisAcc[i]); - - // calculate zhat_i^A - // - //external forces - btVector3 linkAppliedForce = isConstraintPass? m_links[i].m_appliedConstraintForce : m_links[i].m_appliedForce; - btVector3 linkAppliedTorque =isConstraintPass ? m_links[i].m_appliedConstraintTorque : m_links[i].m_appliedTorque; - - zeroAccSpatFrc[i+1].setVector(-(rot_from_world[i+1] * linkAppliedTorque), -(rot_from_world[i+1] * linkAppliedForce )); - -#if 0 - { - - b3Printf("stepVelocitiesMultiDof zeroAccSpatFrc[%d] linear:%f,%f,%f, angular:%f,%f,%f", - i+1, - zeroAccSpatFrc[i+1].m_topVec[0], - zeroAccSpatFrc[i+1].m_topVec[1], - zeroAccSpatFrc[i+1].m_topVec[2], - - zeroAccSpatFrc[i+1].m_bottomVec[0], - zeroAccSpatFrc[i+1].m_bottomVec[1], - zeroAccSpatFrc[i+1].m_bottomVec[2]); - } -#endif - // - //adding damping terms (only) - btScalar linDampMult = 1., angDampMult = 1.; - zeroAccSpatFrc[i+1].addVector(angDampMult * m_links[i].m_inertiaLocal * spatVel[i+1].getAngular() * (DAMPING_K1_ANGULAR + DAMPING_K2_ANGULAR * spatVel[i+1].getAngular().safeNorm()), - linDampMult * m_links[i].m_mass * spatVel[i+1].getLinear() * (DAMPING_K1_LINEAR + DAMPING_K2_LINEAR * spatVel[i+1].getLinear().safeNorm())); - - // calculate Ihat_i^A - //init the spatial AB inertia (it has the simple form thanks to choosing local body frames origins at their COMs) - spatInertia[i+1].setMatrix( btMatrix3x3(0,0,0,0,0,0,0,0,0), - // - btMatrix3x3(m_links[i].m_mass, 0, 0, - 0, m_links[i].m_mass, 0, - 0, 0, m_links[i].m_mass), - // - btMatrix3x3(m_links[i].m_inertiaLocal[0], 0, 0, - 0, m_links[i].m_inertiaLocal[1], 0, - 0, 0, m_links[i].m_inertiaLocal[2]) - ); - // - //p += vhat x Ihat vhat - done in a simpler way - if(m_useGyroTerm) - zeroAccSpatFrc[i+1].addAngular(spatVel[i+1].getAngular().cross(m_links[i].m_inertiaLocal * spatVel[i+1].getAngular())); - // - zeroAccSpatFrc[i+1].addLinear(m_links[i].m_mass * spatVel[i+1].getAngular().cross(spatVel[i+1].getLinear())); - //btVector3 temp = m_links[i].m_mass * spatVel[i+1].getAngular().cross(spatVel[i+1].getLinear()); - ////clamp parent's omega - //btScalar parOmegaMod = temp.length(); - //btScalar parOmegaModMax = 1000; - //if(parOmegaMod > parOmegaModMax) - // temp *= parOmegaModMax / parOmegaMod; - //zeroAccSpatFrc[i+1].addLinear(temp); - //printf("|zeroAccSpatFrc[%d]| = %.4f\n", i+1, temp.length()); - //temp = spatCoriolisAcc[i].getLinear(); - //printf("|spatCoriolisAcc[%d]| = %.4f\n", i+1, temp.length()); - - - - //printf("w[%d] = [%.4f %.4f %.4f]\n", i, vel_top_angular[i+1].x(), vel_top_angular[i+1].y(), vel_top_angular[i+1].z()); - //printf("v[%d] = [%.4f %.4f %.4f]\n", i, vel_bottom_linear[i+1].x(), vel_bottom_linear[i+1].y(), vel_bottom_linear[i+1].z()); - //printf("c[%d] = [%.4f %.4f %.4f]\n", i, coriolis_bottom_linear[i].x(), coriolis_bottom_linear[i].y(), coriolis_bottom_linear[i].z()); - } - - // 'Downward' loop. - // (part of TreeForwardDynamics in Mirtich.) - for (int i = num_links - 1; i >= 0; --i) - { - const int parent = m_links[i].m_parent; - fromParent.m_rotMat = rot_from_parent[i+1]; fromParent.m_trnVec = m_links[i].m_cachedRVector; - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - btSpatialForceVector &hDof = h[m_links[i].m_dofOffset + dof]; - // - hDof = spatInertia[i+1] * m_links[i].m_axes[dof]; - // - Y[m_links[i].m_dofOffset + dof] = m_links[i].m_jointTorque[dof] - - m_links[i].m_axes[dof].dot(zeroAccSpatFrc[i+1]) - - spatCoriolisAcc[i].dot(hDof) - ; - } - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - btScalar *D_row = &D[dof * m_links[i].m_dofCount]; - for(int dof2 = 0; dof2 < m_links[i].m_dofCount; ++dof2) - { - btSpatialForceVector &hDof2 = h[m_links[i].m_dofOffset + dof2]; - D_row[dof2] = m_links[i].m_axes[dof].dot(hDof2); - } - } - - btScalar *invDi = &invD[m_links[i].m_dofOffset*m_links[i].m_dofOffset]; - switch(m_links[i].m_jointType) - { - case btMultibodyLink::ePrismatic: - case btMultibodyLink::eRevolute: - { - invDi[0] = 1.0f / D[0]; - break; - } - case btMultibodyLink::eSpherical: - case btMultibodyLink::ePlanar: - { - btMatrix3x3 D3x3; D3x3.setValue(D[0], D[1], D[2], D[3], D[4], D[5], D[6], D[7], D[8]); - btMatrix3x3 invD3x3; invD3x3 = D3x3.inverse(); - - //unroll the loop? - for(int row = 0; row < 3; ++row) - { - for(int col = 0; col < 3; ++col) - { - invDi[row * 3 + col] = invD3x3[row][col]; - } - } - - break; - } - default: - { - - } - } - - //determine h*D^{-1} - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - spatForceVecTemps[dof].setZero(); - - for(int dof2 = 0; dof2 < m_links[i].m_dofCount; ++dof2) - { - btSpatialForceVector &hDof2 = h[m_links[i].m_dofOffset + dof2]; - // - spatForceVecTemps[dof] += hDof2 * invDi[dof2 * m_links[i].m_dofCount + dof]; - } - } - - dyadTemp = spatInertia[i+1]; - - //determine (h*D^{-1}) * h^{T} - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - btSpatialForceVector &hDof = h[m_links[i].m_dofOffset + dof]; - // - dyadTemp -= symmetricSpatialOuterProduct(hDof, spatForceVecTemps[dof]); - } - - fromParent.transformInverse(dyadTemp, spatInertia[parent+1], btSpatialTransformationMatrix::Add); - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - invD_times_Y[dof] = 0.f; - - for(int dof2 = 0; dof2 < m_links[i].m_dofCount; ++dof2) - { - invD_times_Y[dof] += invDi[dof * m_links[i].m_dofCount + dof2] * Y[m_links[i].m_dofOffset + dof2]; - } - } - - spatForceVecTemps[0] = zeroAccSpatFrc[i+1] + spatInertia[i+1] * spatCoriolisAcc[i]; - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - btSpatialForceVector &hDof = h[m_links[i].m_dofOffset + dof]; - // - spatForceVecTemps[0] += hDof * invD_times_Y[dof]; - } - - fromParent.transformInverse(spatForceVecTemps[0], spatForceVecTemps[1]); - - zeroAccSpatFrc[parent+1] += spatForceVecTemps[1]; - } - - - // Second 'upward' loop - // (part of TreeForwardDynamics in Mirtich) - - if (m_fixedBase) - { - spatAcc[0].setZero(); - } - else - { - if (num_links > 0) - { - m_cachedInertiaValid = true; - m_cachedInertiaTopLeft = spatInertia[0].m_topLeftMat; - m_cachedInertiaTopRight = spatInertia[0].m_topRightMat; - m_cachedInertiaLowerLeft = spatInertia[0].m_bottomLeftMat; - m_cachedInertiaLowerRight= spatInertia[0].m_topLeftMat.transpose(); - - } - - solveImatrix(zeroAccSpatFrc[0], result); - spatAcc[0] = -result; - } - - - // now do the loop over the m_links - for (int i = 0; i < num_links; ++i) - { - // qdd = D^{-1} * (Y - h^{T}*apar) = (S^{T}*I*S)^{-1} * (tau - S^{T}*I*cor - S^{T}*zeroAccFrc - S^{T}*I*apar) - // a = apar + cor + Sqdd - //or - // qdd = D^{-1} * (Y - h^{T}*(apar+cor)) - // a = apar + Sqdd - - const int parent = m_links[i].m_parent; - fromParent.m_rotMat = rot_from_parent[i+1]; fromParent.m_trnVec = m_links[i].m_cachedRVector; - - fromParent.transform(spatAcc[parent+1], spatAcc[i+1]); - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - btSpatialForceVector &hDof = h[m_links[i].m_dofOffset + dof]; - // - Y_minus_hT_a[dof] = Y[m_links[i].m_dofOffset + dof] - spatAcc[i+1].dot(hDof); - } - - btScalar *invDi = &invD[m_links[i].m_dofOffset*m_links[i].m_dofOffset]; - //D^{-1} * (Y - h^{T}*apar) - mulMatrix(invDi, Y_minus_hT_a, m_links[i].m_dofCount, m_links[i].m_dofCount, m_links[i].m_dofCount, 1, &joint_accel[m_links[i].m_dofOffset]); - - spatAcc[i+1] += spatCoriolisAcc[i]; - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - spatAcc[i+1] += m_links[i].m_axes[dof] * joint_accel[m_links[i].m_dofOffset + dof]; - - if (m_links[i].m_jointFeedback) - { - m_internalNeedsJointFeedback = true; - - btVector3 angularBotVec = (spatInertia[i+1]*spatAcc[i+1]+zeroAccSpatFrc[i+1]).m_bottomVec; - btVector3 linearTopVec = (spatInertia[i+1]*spatAcc[i+1]+zeroAccSpatFrc[i+1]).m_topVec; - - if (gJointFeedbackInJointFrame) - { - //shift the reaction forces to the joint frame - //linear (force) component is the same - //shift the angular (torque, moment) component using the relative position, m_links[i].m_dVector - angularBotVec = angularBotVec - linearTopVec.cross(m_links[i].m_dVector); - } - - - if (gJointFeedbackInWorldSpace) - { - if (isConstraintPass) - { - m_links[i].m_jointFeedback->m_reactionForces.m_bottomVec += m_links[i].m_cachedWorldTransform.getBasis()*angularBotVec; - m_links[i].m_jointFeedback->m_reactionForces.m_topVec += m_links[i].m_cachedWorldTransform.getBasis()*linearTopVec; - } else - { - m_links[i].m_jointFeedback->m_reactionForces.m_bottomVec = m_links[i].m_cachedWorldTransform.getBasis()*angularBotVec; - m_links[i].m_jointFeedback->m_reactionForces.m_topVec = m_links[i].m_cachedWorldTransform.getBasis()*linearTopVec; - } - } else - { - if (isConstraintPass) - { - m_links[i].m_jointFeedback->m_reactionForces.m_bottomVec += angularBotVec; - m_links[i].m_jointFeedback->m_reactionForces.m_topVec += linearTopVec; - - } - else - { - m_links[i].m_jointFeedback->m_reactionForces.m_bottomVec = angularBotVec; - m_links[i].m_jointFeedback->m_reactionForces.m_topVec = linearTopVec; - } - } - } - - } - - // transform base accelerations back to the world frame. - btVector3 omegadot_out = rot_from_parent[0].transpose() * spatAcc[0].getAngular(); - output[0] = omegadot_out[0]; - output[1] = omegadot_out[1]; - output[2] = omegadot_out[2]; - - btVector3 vdot_out = rot_from_parent[0].transpose() * (spatAcc[0].getLinear() + spatVel[0].getAngular().cross(spatVel[0].getLinear())); - output[3] = vdot_out[0]; - output[4] = vdot_out[1]; - output[5] = vdot_out[2]; - - ///////////////// - //printf("q = ["); - //printf("%.6f, %.6f, %.6f, %.6f, %.6f, %.6f, %.6f ", m_baseQuat.x(), m_baseQuat.y(), m_baseQuat.z(), m_baseQuat.w(), m_basePos.x(), m_basePos.y(), m_basePos.z()); - //for(int link = 0; link < getNumLinks(); ++link) - // for(int dof = 0; dof < m_links[link].m_dofCount; ++dof) - // printf("%.6f ", m_links[link].m_jointPos[dof]); - //printf("]\n"); - //// - //printf("qd = ["); - //for(int dof = 0; dof < getNumDofs() + 6; ++dof) - // printf("%.6f ", m_realBuf[dof]); - //printf("]\n"); - //printf("qdd = ["); - //for(int dof = 0; dof < getNumDofs() + 6; ++dof) - // printf("%.6f ", output[dof]); - //printf("]\n"); - ///////////////// - - // Final step: add the accelerations (times dt) to the velocities. - - if (!isConstraintPass) - { - if(dt > 0.) - applyDeltaVeeMultiDof(output, dt); - - } - ///// - //btScalar angularThres = 1; - //btScalar maxAngVel = 0.; - //bool scaleDown = 1.; - //for(int link = 0; link < m_links.size(); ++link) - //{ - // if(spatVel[link+1].getAngular().length() > maxAngVel) - // { - // maxAngVel = spatVel[link+1].getAngular().length(); - // scaleDown = angularThres / spatVel[link+1].getAngular().length(); - // break; - // } - //} - - //if(scaleDown != 1.) - //{ - // for(int link = 0; link < m_links.size(); ++link) - // { - // if(m_links[link].m_jointType == btMultibodyLink::eRevolute || m_links[link].m_jointType == btMultibodyLink::eSpherical) - // { - // for(int dof = 0; dof < m_links[link].m_dofCount; ++dof) - // getJointVelMultiDof(link)[dof] *= scaleDown; - // } - // } - //} - ///// - - ///////////////////// - if(m_useGlobalVelocities) - { - for (int i = 0; i < num_links; ++i) - { - const int parent = m_links[i].m_parent; - //rot_from_parent[i+1] = btMatrix3x3(m_links[i].m_cachedRotParentToThis); /// <- done - //rot_from_world[i+1] = rot_from_parent[i+1] * rot_from_world[parent+1]; /// <- done - - fromParent.m_rotMat = rot_from_parent[i+1]; fromParent.m_trnVec = m_links[i].m_cachedRVector; - fromWorld.m_rotMat = rot_from_world[i+1]; - - // vhat_i = i_xhat_p(i) * vhat_p(i) - fromParent.transform(spatVel[parent+1], spatVel[i+1]); - //nice alternative below (using operator *) but it generates temps - ///////////////////////////////////////////////////////////// - - // now set vhat_i to its true value by doing - // vhat_i += qidot * shat_i - spatJointVel.setZero(); - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - spatJointVel += m_links[i].m_axes[dof] * getJointVelMultiDof(i)[dof]; - - // remember vhat_i is really vhat_p(i) (but in current frame) at this point => we need to add velocity across the inboard joint - spatVel[i+1] += spatJointVel; - - - fromWorld.transformInverseRotationOnly(spatVel[i+1], m_links[i].m_absFrameTotVelocity); - fromWorld.transformInverseRotationOnly(spatJointVel, m_links[i].m_absFrameLocVelocity); - } - } - -} - - - -void btMultiBody::solveImatrix(const btVector3& rhs_top, const btVector3& rhs_bot, btScalar result[6]) const -{ - int num_links = getNumLinks(); - ///solve I * x = rhs, so the result = invI * rhs - if (num_links == 0) - { - // in the case of 0 m_links (i.e. a plain rigid body, not a multibody) rhs * invI is easier - result[0] = rhs_bot[0] / m_baseInertia[0]; - result[1] = rhs_bot[1] / m_baseInertia[1]; - result[2] = rhs_bot[2] / m_baseInertia[2]; - result[3] = rhs_top[0] / m_baseMass; - result[4] = rhs_top[1] / m_baseMass; - result[5] = rhs_top[2] / m_baseMass; - } else - { - if (!m_cachedInertiaValid) - { - for (int i=0;i<6;i++) - { - result[i] = 0.f; - } - return; - } - /// Special routine for calculating the inverse of a spatial inertia matrix - ///the 6x6 matrix is stored as 4 blocks of 3x3 matrices - btMatrix3x3 Binv = m_cachedInertiaTopRight.inverse()*-1.f; - btMatrix3x3 tmp = m_cachedInertiaLowerRight * Binv; - btMatrix3x3 invIupper_right = (tmp * m_cachedInertiaTopLeft + m_cachedInertiaLowerLeft).inverse(); - tmp = invIupper_right * m_cachedInertiaLowerRight; - btMatrix3x3 invI_upper_left = (tmp * Binv); - btMatrix3x3 invI_lower_right = (invI_upper_left).transpose(); - tmp = m_cachedInertiaTopLeft * invI_upper_left; - tmp[0][0]-= 1.0; - tmp[1][1]-= 1.0; - tmp[2][2]-= 1.0; - btMatrix3x3 invI_lower_left = (Binv * tmp); - - //multiply result = invI * rhs - { - btVector3 vtop = invI_upper_left*rhs_top; - btVector3 tmp; - tmp = invIupper_right * rhs_bot; - vtop += tmp; - btVector3 vbot = invI_lower_left*rhs_top; - tmp = invI_lower_right * rhs_bot; - vbot += tmp; - result[0] = vtop[0]; - result[1] = vtop[1]; - result[2] = vtop[2]; - result[3] = vbot[0]; - result[4] = vbot[1]; - result[5] = vbot[2]; - } - - } -} -void btMultiBody::solveImatrix(const btSpatialForceVector &rhs, btSpatialMotionVector &result) const -{ - int num_links = getNumLinks(); - ///solve I * x = rhs, so the result = invI * rhs - if (num_links == 0) - { - // in the case of 0 m_links (i.e. a plain rigid body, not a multibody) rhs * invI is easier - result.setAngular(rhs.getAngular() / m_baseInertia); - result.setLinear(rhs.getLinear() / m_baseMass); - } else - { - /// Special routine for calculating the inverse of a spatial inertia matrix - ///the 6x6 matrix is stored as 4 blocks of 3x3 matrices - if (!m_cachedInertiaValid) - { - result.setLinear(btVector3(0,0,0)); - result.setAngular(btVector3(0,0,0)); - result.setVector(btVector3(0,0,0),btVector3(0,0,0)); - return; - } - btMatrix3x3 Binv = m_cachedInertiaTopRight.inverse()*-1.f; - btMatrix3x3 tmp = m_cachedInertiaLowerRight * Binv; - btMatrix3x3 invIupper_right = (tmp * m_cachedInertiaTopLeft + m_cachedInertiaLowerLeft).inverse(); - tmp = invIupper_right * m_cachedInertiaLowerRight; - btMatrix3x3 invI_upper_left = (tmp * Binv); - btMatrix3x3 invI_lower_right = (invI_upper_left).transpose(); - tmp = m_cachedInertiaTopLeft * invI_upper_left; - tmp[0][0]-= 1.0; - tmp[1][1]-= 1.0; - tmp[2][2]-= 1.0; - btMatrix3x3 invI_lower_left = (Binv * tmp); - - //multiply result = invI * rhs - { - btVector3 vtop = invI_upper_left*rhs.getLinear(); - btVector3 tmp; - tmp = invIupper_right * rhs.getAngular(); - vtop += tmp; - btVector3 vbot = invI_lower_left*rhs.getLinear(); - tmp = invI_lower_right * rhs.getAngular(); - vbot += tmp; - result.setVector(vtop, vbot); - } - - } -} - -void btMultiBody::mulMatrix(btScalar *pA, btScalar *pB, int rowsA, int colsA, int rowsB, int colsB, btScalar *pC) const -{ - for (int row = 0; row < rowsA; row++) - { - for (int col = 0; col < colsB; col++) - { - pC[row * colsB + col] = 0.f; - for (int inner = 0; inner < rowsB; inner++) - { - pC[row * colsB + col] += pA[row * colsA + inner] * pB[col + inner * colsB]; - } - } - } -} - -void btMultiBody::calcAccelerationDeltasMultiDof(const btScalar *force, btScalar *output, - btAlignedObjectArray<btScalar> &scratch_r, btAlignedObjectArray<btVector3> &scratch_v) const -{ - // Temporary matrices/vectors -- use scratch space from caller - // so that we don't have to keep reallocating every frame - - - int num_links = getNumLinks(); - scratch_r.resize(m_dofCount); - scratch_v.resize(4*num_links + 4); - - btScalar * r_ptr = m_dofCount ? &scratch_r[0] : 0; - btVector3 * v_ptr = &scratch_v[0]; - - // zhat_i^A (scratch space) - btSpatialForceVector * zeroAccSpatFrc = (btSpatialForceVector *)v_ptr; - v_ptr += num_links * 2 + 2; - - // rot_from_parent (cached from calcAccelerations) - const btMatrix3x3 * rot_from_parent = &m_matrixBuf[0]; - - // hhat (cached), accel (scratch) - // hhat is NOT stored for the base (but ahat is) - const btSpatialForceVector * h = (btSpatialForceVector *)(m_dofCount > 0 ? &m_vectorBuf[0] : 0); - btSpatialMotionVector * spatAcc = (btSpatialMotionVector *)v_ptr; - v_ptr += num_links * 2 + 2; - - // Y_i (scratch), invD_i (cached) - const btScalar * invD = m_dofCount > 0 ? &m_realBuf[6 + m_dofCount] : 0; - btScalar * Y = r_ptr; - //////////////// - //aux variables - btScalar invD_times_Y[6]; //D^{-1} * Y [dofxdof x dofx1 = dofx1] <=> D^{-1} * u; better moved to buffers since it is recalced in calcAccelerationDeltasMultiDof; num_dof of btScalar would cover all bodies - btSpatialMotionVector result; //holds results of the SolveImatrix op; it is a spatial motion vector (accel) - btScalar Y_minus_hT_a[6]; //Y - h^{T} * a; it's dofx1 for each body so a single 6x1 temp is enough - btSpatialForceVector spatForceVecTemps[6]; //6 temporary spatial force vectors - btSpatialTransformationMatrix fromParent; - ///////////////// - - // First 'upward' loop. - // Combines CompTreeLinkVelocities and InitTreeLinks from Mirtich. - - // Fill in zero_acc - // -- set to force/torque on the base, zero otherwise - if (m_fixedBase) - { - zeroAccSpatFrc[0].setZero(); - } else - { - //test forces - fromParent.m_rotMat = rot_from_parent[0]; - fromParent.transformRotationOnly(btSpatialForceVector(-force[0],-force[1],-force[2], -force[3],-force[4],-force[5]), zeroAccSpatFrc[0]); - } - for (int i = 0; i < num_links; ++i) - { - zeroAccSpatFrc[i+1].setZero(); - } - - // 'Downward' loop. - // (part of TreeForwardDynamics in Mirtich.) - for (int i = num_links - 1; i >= 0; --i) - { - const int parent = m_links[i].m_parent; - fromParent.m_rotMat = rot_from_parent[i+1]; fromParent.m_trnVec = m_links[i].m_cachedRVector; - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - Y[m_links[i].m_dofOffset + dof] = force[6 + m_links[i].m_dofOffset + dof] - - m_links[i].m_axes[dof].dot(zeroAccSpatFrc[i+1]) - ; - } - - btVector3 in_top, in_bottom, out_top, out_bottom; - const btScalar *invDi = &invD[m_links[i].m_dofOffset*m_links[i].m_dofOffset]; - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - invD_times_Y[dof] = 0.f; - - for(int dof2 = 0; dof2 < m_links[i].m_dofCount; ++dof2) - { - invD_times_Y[dof] += invDi[dof * m_links[i].m_dofCount + dof2] * Y[m_links[i].m_dofOffset + dof2]; - } - } - - // Zp += pXi * (Zi + hi*Yi/Di) - spatForceVecTemps[0] = zeroAccSpatFrc[i+1]; - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - const btSpatialForceVector &hDof = h[m_links[i].m_dofOffset + dof]; - // - spatForceVecTemps[0] += hDof * invD_times_Y[dof]; - } - - - fromParent.transformInverse(spatForceVecTemps[0], spatForceVecTemps[1]); - - zeroAccSpatFrc[parent+1] += spatForceVecTemps[1]; - } - - // ptr to the joint accel part of the output - btScalar * joint_accel = output + 6; - - - // Second 'upward' loop - // (part of TreeForwardDynamics in Mirtich) - - if (m_fixedBase) - { - spatAcc[0].setZero(); - } - else - { - solveImatrix(zeroAccSpatFrc[0], result); - spatAcc[0] = -result; - - } - - // now do the loop over the m_links - for (int i = 0; i < num_links; ++i) - { - const int parent = m_links[i].m_parent; - fromParent.m_rotMat = rot_from_parent[i+1]; fromParent.m_trnVec = m_links[i].m_cachedRVector; - - fromParent.transform(spatAcc[parent+1], spatAcc[i+1]); - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - { - const btSpatialForceVector &hDof = h[m_links[i].m_dofOffset + dof]; - // - Y_minus_hT_a[dof] = Y[m_links[i].m_dofOffset + dof] - spatAcc[i+1].dot(hDof); - } - - const btScalar *invDi = &invD[m_links[i].m_dofOffset*m_links[i].m_dofOffset]; - mulMatrix(const_cast<btScalar*>(invDi), Y_minus_hT_a, m_links[i].m_dofCount, m_links[i].m_dofCount, m_links[i].m_dofCount, 1, &joint_accel[m_links[i].m_dofOffset]); - - for(int dof = 0; dof < m_links[i].m_dofCount; ++dof) - spatAcc[i+1] += m_links[i].m_axes[dof] * joint_accel[m_links[i].m_dofOffset + dof]; - } - - // transform base accelerations back to the world frame. - btVector3 omegadot_out; - omegadot_out = rot_from_parent[0].transpose() * spatAcc[0].getAngular(); - output[0] = omegadot_out[0]; - output[1] = omegadot_out[1]; - output[2] = omegadot_out[2]; - - btVector3 vdot_out; - vdot_out = rot_from_parent[0].transpose() * spatAcc[0].getLinear(); - output[3] = vdot_out[0]; - output[4] = vdot_out[1]; - output[5] = vdot_out[2]; - - ///////////////// - //printf("delta = ["); - //for(int dof = 0; dof < getNumDofs() + 6; ++dof) - // printf("%.2f ", output[dof]); - //printf("]\n"); - ///////////////// -} - - - - -void btMultiBody::stepPositionsMultiDof(btScalar dt, btScalar *pq, btScalar *pqd) -{ - int num_links = getNumLinks(); - // step position by adding dt * velocity - //btVector3 v = getBaseVel(); - //m_basePos += dt * v; - // - btScalar *pBasePos = (pq ? &pq[4] : m_basePos); - btScalar *pBaseVel = (pqd ? &pqd[3] : &m_realBuf[3]); //note: the !pqd case assumes m_realBuf holds with base velocity at 3,4,5 (should be wrapped for safety) - // - pBasePos[0] += dt * pBaseVel[0]; - pBasePos[1] += dt * pBaseVel[1]; - pBasePos[2] += dt * pBaseVel[2]; - - /////////////////////////////// - //local functor for quaternion integration (to avoid error prone redundancy) - struct - { - //"exponential map" based on btTransformUtil::integrateTransform(..) - void operator() (const btVector3 &omega, btQuaternion &quat, bool baseBody, btScalar dt) - { - //baseBody => quat is alias and omega is global coor - //!baseBody => quat is alibi and omega is local coor - - btVector3 axis; - btVector3 angvel; - - if(!baseBody) - angvel = quatRotate(quat, omega); //if quat is not m_baseQuat, it is alibi => ok - else - angvel = omega; - - btScalar fAngle = angvel.length(); - //limit the angular motion - if (fAngle * dt > ANGULAR_MOTION_THRESHOLD) - { - fAngle = btScalar(0.5)*SIMD_HALF_PI / dt; - } - - if ( fAngle < btScalar(0.001) ) - { - // use Taylor's expansions of sync function - axis = angvel*( btScalar(0.5)*dt-(dt*dt*dt)*(btScalar(0.020833333333))*fAngle*fAngle ); - } - else - { - // sync(fAngle) = sin(c*fAngle)/t - axis = angvel*( btSin(btScalar(0.5)*fAngle*dt)/fAngle ); - } - - if(!baseBody) - quat = btQuaternion(axis.x(),axis.y(),axis.z(),btCos( fAngle*dt*btScalar(0.5) )) * quat; - else - quat = quat * btQuaternion(-axis.x(),-axis.y(),-axis.z(),btCos( fAngle*dt*btScalar(0.5) )); - //equivalent to: quat = (btQuaternion(axis.x(),axis.y(),axis.z(),btCos( fAngle*dt*btScalar(0.5) )) * quat.inverse()).inverse(); - - quat.normalize(); - } - } pQuatUpdateFun; - /////////////////////////////// - - //pQuatUpdateFun(getBaseOmega(), m_baseQuat, true, dt); - // - btScalar *pBaseQuat = pq ? pq : m_baseQuat; - btScalar *pBaseOmega = pqd ? pqd : &m_realBuf[0]; //note: the !pqd case assumes m_realBuf starts with base omega (should be wrapped for safety) - // - btQuaternion baseQuat; baseQuat.setValue(pBaseQuat[0], pBaseQuat[1], pBaseQuat[2], pBaseQuat[3]); - btVector3 baseOmega; baseOmega.setValue(pBaseOmega[0], pBaseOmega[1], pBaseOmega[2]); - pQuatUpdateFun(baseOmega, baseQuat, true, dt); - pBaseQuat[0] = baseQuat.x(); - pBaseQuat[1] = baseQuat.y(); - pBaseQuat[2] = baseQuat.z(); - pBaseQuat[3] = baseQuat.w(); - - - //printf("pBaseOmega = %.4f %.4f %.4f\n", pBaseOmega->x(), pBaseOmega->y(), pBaseOmega->z()); - //printf("pBaseVel = %.4f %.4f %.4f\n", pBaseVel->x(), pBaseVel->y(), pBaseVel->z()); - //printf("baseQuat = %.4f %.4f %.4f %.4f\n", pBaseQuat->x(), pBaseQuat->y(), pBaseQuat->z(), pBaseQuat->w()); - - if(pq) - pq += 7; - if(pqd) - pqd += 6; - - // Finally we can update m_jointPos for each of the m_links - for (int i = 0; i < num_links; ++i) - { - btScalar *pJointPos = (pq ? pq : &m_links[i].m_jointPos[0]); - btScalar *pJointVel = (pqd ? pqd : getJointVelMultiDof(i)); - - switch(m_links[i].m_jointType) - { - case btMultibodyLink::ePrismatic: - case btMultibodyLink::eRevolute: - { - btScalar jointVel = pJointVel[0]; - pJointPos[0] += dt * jointVel; - break; - } - case btMultibodyLink::eSpherical: - { - btVector3 jointVel; jointVel.setValue(pJointVel[0], pJointVel[1], pJointVel[2]); - btQuaternion jointOri; jointOri.setValue(pJointPos[0], pJointPos[1], pJointPos[2], pJointPos[3]); - pQuatUpdateFun(jointVel, jointOri, false, dt); - pJointPos[0] = jointOri.x(); pJointPos[1] = jointOri.y(); pJointPos[2] = jointOri.z(); pJointPos[3] = jointOri.w(); - break; - } - case btMultibodyLink::ePlanar: - { - pJointPos[0] += dt * getJointVelMultiDof(i)[0]; - - btVector3 q0_coors_qd1qd2 = getJointVelMultiDof(i)[1] * m_links[i].getAxisBottom(1) + getJointVelMultiDof(i)[2] * m_links[i].getAxisBottom(2); - btVector3 no_q0_coors_qd1qd2 = quatRotate(btQuaternion(m_links[i].getAxisTop(0), pJointPos[0]), q0_coors_qd1qd2); - pJointPos[1] += m_links[i].getAxisBottom(1).dot(no_q0_coors_qd1qd2) * dt; - pJointPos[2] += m_links[i].getAxisBottom(2).dot(no_q0_coors_qd1qd2) * dt; - - break; - } - default: - { - } - - } - - m_links[i].updateCacheMultiDof(pq); - - if(pq) - pq += m_links[i].m_posVarCount; - if(pqd) - pqd += m_links[i].m_dofCount; - } -} - -void btMultiBody::fillConstraintJacobianMultiDof(int link, - const btVector3 &contact_point, - const btVector3 &normal_ang, - const btVector3 &normal_lin, - btScalar *jac, - btAlignedObjectArray<btScalar> &scratch_r, - btAlignedObjectArray<btVector3> &scratch_v, - btAlignedObjectArray<btMatrix3x3> &scratch_m) const -{ - // temporary space - int num_links = getNumLinks(); - int m_dofCount = getNumDofs(); - scratch_v.resize(3*num_links + 3); //(num_links + base) offsets + (num_links + base) normals_lin + (num_links + base) normals_ang - scratch_m.resize(num_links + 1); - - btVector3 * v_ptr = &scratch_v[0]; - btVector3 * p_minus_com_local = v_ptr; v_ptr += num_links + 1; - btVector3 * n_local_lin = v_ptr; v_ptr += num_links + 1; - btVector3 * n_local_ang = v_ptr; v_ptr += num_links + 1; - btAssert(v_ptr - &scratch_v[0] == scratch_v.size()); - - scratch_r.resize(m_dofCount); - btScalar * results = m_dofCount > 0 ? &scratch_r[0] : 0; - - btMatrix3x3 * rot_from_world = &scratch_m[0]; - - const btVector3 p_minus_com_world = contact_point - m_basePos; - const btVector3 &normal_lin_world = normal_lin; //convenience - const btVector3 &normal_ang_world = normal_ang; - - rot_from_world[0] = btMatrix3x3(m_baseQuat); - - // omega coeffients first. - btVector3 omega_coeffs_world; - omega_coeffs_world = p_minus_com_world.cross(normal_lin_world); - jac[0] = omega_coeffs_world[0] + normal_ang_world[0]; - jac[1] = omega_coeffs_world[1] + normal_ang_world[1]; - jac[2] = omega_coeffs_world[2] + normal_ang_world[2]; - // then v coefficients - jac[3] = normal_lin_world[0]; - jac[4] = normal_lin_world[1]; - jac[5] = normal_lin_world[2]; - - //create link-local versions of p_minus_com and normal - p_minus_com_local[0] = rot_from_world[0] * p_minus_com_world; - n_local_lin[0] = rot_from_world[0] * normal_lin_world; - n_local_ang[0] = rot_from_world[0] * normal_ang_world; - - // Set remaining jac values to zero for now. - for (int i = 6; i < 6 + m_dofCount; ++i) - { - jac[i] = 0; - } - - // Qdot coefficients, if necessary. - if (num_links > 0 && link > -1) { - - // TODO: speed this up -- don't calculate for m_links we don't need. - // (Also, we are making 3 separate calls to this function, for the normal & the 2 friction directions, - // which is resulting in repeated work being done...) - - // calculate required normals & positions in the local frames. - for (int i = 0; i < num_links; ++i) { - - // transform to local frame - const int parent = m_links[i].m_parent; - const btMatrix3x3 mtx(m_links[i].m_cachedRotParentToThis); - rot_from_world[i+1] = mtx * rot_from_world[parent+1]; - - n_local_lin[i+1] = mtx * n_local_lin[parent+1]; - n_local_ang[i+1] = mtx * n_local_ang[parent+1]; - p_minus_com_local[i+1] = mtx * p_minus_com_local[parent+1] - m_links[i].m_cachedRVector; - - // calculate the jacobian entry - switch(m_links[i].m_jointType) - { - case btMultibodyLink::eRevolute: - { - results[m_links[i].m_dofOffset] = n_local_lin[i+1].dot(m_links[i].getAxisTop(0).cross(p_minus_com_local[i+1]) + m_links[i].getAxisBottom(0)); - results[m_links[i].m_dofOffset] += n_local_ang[i+1].dot(m_links[i].getAxisTop(0)); - break; - } - case btMultibodyLink::ePrismatic: - { - results[m_links[i].m_dofOffset] = n_local_lin[i+1].dot(m_links[i].getAxisBottom(0)); - break; - } - case btMultibodyLink::eSpherical: - { - results[m_links[i].m_dofOffset + 0] = n_local_lin[i+1].dot(m_links[i].getAxisTop(0).cross(p_minus_com_local[i+1]) + m_links[i].getAxisBottom(0)); - results[m_links[i].m_dofOffset + 1] = n_local_lin[i+1].dot(m_links[i].getAxisTop(1).cross(p_minus_com_local[i+1]) + m_links[i].getAxisBottom(1)); - results[m_links[i].m_dofOffset + 2] = n_local_lin[i+1].dot(m_links[i].getAxisTop(2).cross(p_minus_com_local[i+1]) + m_links[i].getAxisBottom(2)); - - results[m_links[i].m_dofOffset + 0] += n_local_ang[i+1].dot(m_links[i].getAxisTop(0)); - results[m_links[i].m_dofOffset + 1] += n_local_ang[i+1].dot(m_links[i].getAxisTop(1)); - results[m_links[i].m_dofOffset + 2] += n_local_ang[i+1].dot(m_links[i].getAxisTop(2)); - - break; - } - case btMultibodyLink::ePlanar: - { - results[m_links[i].m_dofOffset + 0] = n_local_lin[i+1].dot(m_links[i].getAxisTop(0).cross(p_minus_com_local[i+1]));// + m_links[i].getAxisBottom(0)); - results[m_links[i].m_dofOffset + 1] = n_local_lin[i+1].dot(m_links[i].getAxisBottom(1)); - results[m_links[i].m_dofOffset + 2] = n_local_lin[i+1].dot(m_links[i].getAxisBottom(2)); - - break; - } - default: - { - } - } - - } - - // Now copy through to output. - //printf("jac[%d] = ", link); - while (link != -1) - { - for(int dof = 0; dof < m_links[link].m_dofCount; ++dof) - { - jac[6 + m_links[link].m_dofOffset + dof] = results[m_links[link].m_dofOffset + dof]; - //printf("%.2f\t", jac[6 + m_links[link].m_dofOffset + dof]); - } - - link = m_links[link].m_parent; - } - //printf("]\n"); - } -} - - -void btMultiBody::wakeUp() -{ - m_awake = true; -} - -void btMultiBody::goToSleep() -{ - m_awake = false; -} - -void btMultiBody::checkMotionAndSleepIfRequired(btScalar timestep) -{ - extern bool gDisableDeactivation; - if (!m_canSleep || gDisableDeactivation) - { - m_awake = true; - m_sleepTimer = 0; - return; - } - - // motion is computed as omega^2 + v^2 + (sum of squares of joint velocities) - btScalar motion = 0; - { - for (int i = 0; i < 6 + m_dofCount; ++i) - motion += m_realBuf[i] * m_realBuf[i]; - } - - - if (motion < SLEEP_EPSILON) { - m_sleepTimer += timestep; - if (m_sleepTimer > SLEEP_TIMEOUT) { - goToSleep(); - } - } else { - m_sleepTimer = 0; - if (!m_awake) - wakeUp(); - } -} - - -void btMultiBody::forwardKinematics(btAlignedObjectArray<btQuaternion>& world_to_local,btAlignedObjectArray<btVector3>& local_origin) -{ - - int num_links = getNumLinks(); - - // Cached 3x3 rotation matrices from parent frame to this frame. - btMatrix3x3* rot_from_parent =(btMatrix3x3 *) &m_matrixBuf[0]; - - rot_from_parent[0] = btMatrix3x3(m_baseQuat); //m_baseQuat assumed to be alias!? - - for (int i = 0; i < num_links; ++i) - { - rot_from_parent[i+1] = btMatrix3x3(m_links[i].m_cachedRotParentToThis); - } - - int nLinks = getNumLinks(); - ///base + num m_links - world_to_local.resize(nLinks+1); - local_origin.resize(nLinks+1); - - world_to_local[0] = getWorldToBaseRot(); - local_origin[0] = getBasePos(); - - for (int k=0;k<getNumLinks();k++) - { - const int parent = getParent(k); - world_to_local[k+1] = getParentToLocalRot(k) * world_to_local[parent+1]; - local_origin[k+1] = local_origin[parent+1] + (quatRotate(world_to_local[k+1].inverse() , getRVector(k))); - } - - for (int link=0;link<getNumLinks();link++) - { - int index = link+1; - - btVector3 posr = local_origin[index]; - btScalar quat[4]={-world_to_local[index].x(),-world_to_local[index].y(),-world_to_local[index].z(),world_to_local[index].w()}; - btTransform tr; - tr.setIdentity(); - tr.setOrigin(posr); - tr.setRotation(btQuaternion(quat[0],quat[1],quat[2],quat[3])); - getLink(link).m_cachedWorldTransform = tr; - - } - -} - -void btMultiBody::updateCollisionObjectWorldTransforms(btAlignedObjectArray<btQuaternion>& world_to_local,btAlignedObjectArray<btVector3>& local_origin) -{ - world_to_local.resize(getNumLinks()+1); - local_origin.resize(getNumLinks()+1); - - world_to_local[0] = getWorldToBaseRot(); - local_origin[0] = getBasePos(); - - if (getBaseCollider()) - { - btVector3 posr = local_origin[0]; - // float pos[4]={posr.x(),posr.y(),posr.z(),1}; - btScalar quat[4]={-world_to_local[0].x(),-world_to_local[0].y(),-world_to_local[0].z(),world_to_local[0].w()}; - btTransform tr; - tr.setIdentity(); - tr.setOrigin(posr); - tr.setRotation(btQuaternion(quat[0],quat[1],quat[2],quat[3])); - - getBaseCollider()->setWorldTransform(tr); - - } - - for (int k=0;k<getNumLinks();k++) - { - const int parent = getParent(k); - world_to_local[k+1] = getParentToLocalRot(k) * world_to_local[parent+1]; - local_origin[k+1] = local_origin[parent+1] + (quatRotate(world_to_local[k+1].inverse() , getRVector(k))); - } - - - for (int m=0;m<getNumLinks();m++) - { - btMultiBodyLinkCollider* col = getLink(m).m_collider; - if (col) - { - int link = col->m_link; - btAssert(link == m); - - int index = link+1; - - btVector3 posr = local_origin[index]; - // float pos[4]={posr.x(),posr.y(),posr.z(),1}; - btScalar quat[4]={-world_to_local[index].x(),-world_to_local[index].y(),-world_to_local[index].z(),world_to_local[index].w()}; - btTransform tr; - tr.setIdentity(); - tr.setOrigin(posr); - tr.setRotation(btQuaternion(quat[0],quat[1],quat[2],quat[3])); - - col->setWorldTransform(tr); - } - } -} - -int btMultiBody::calculateSerializeBufferSize() const -{ - int sz = sizeof(btMultiBodyData); - return sz; -} - - ///fills the dataBuffer and returns the struct name (and 0 on failure) -const char* btMultiBody::serialize(void* dataBuffer, class btSerializer* serializer) const -{ - btMultiBodyData* mbd = (btMultiBodyData*) dataBuffer; - getBaseWorldTransform().serialize(mbd->m_baseWorldTransform); - mbd->m_baseMass = this->getBaseMass(); - getBaseInertia().serialize(mbd->m_baseInertia); - { - char* name = (char*) serializer->findNameForPointer(m_baseName); - mbd->m_baseName = (char*)serializer->getUniquePointer(name); - if (mbd->m_baseName) - { - serializer->serializeName(name); - } - } - mbd->m_numLinks = this->getNumLinks(); - if (mbd->m_numLinks) - { - int sz = sizeof(btMultiBodyLinkData); - int numElem = mbd->m_numLinks; - btChunk* chunk = serializer->allocate(sz,numElem); - btMultiBodyLinkData* memPtr = (btMultiBodyLinkData*)chunk->m_oldPtr; - for (int i=0;i<numElem;i++,memPtr++) - { - - memPtr->m_jointType = getLink(i).m_jointType; - memPtr->m_dofCount = getLink(i).m_dofCount; - memPtr->m_posVarCount = getLink(i).m_posVarCount; - - getLink(i).m_inertiaLocal.serialize(memPtr->m_linkInertia); - memPtr->m_linkMass = getLink(i).m_mass; - memPtr->m_parentIndex = getLink(i).m_parent; - memPtr->m_jointDamping = getLink(i).m_jointDamping; - memPtr->m_jointFriction = getLink(i).m_jointFriction; - memPtr->m_jointLowerLimit = getLink(i).m_jointLowerLimit; - memPtr->m_jointUpperLimit = getLink(i).m_jointUpperLimit; - memPtr->m_jointMaxForce = getLink(i).m_jointMaxForce; - memPtr->m_jointMaxVelocity = getLink(i).m_jointMaxVelocity; - - getLink(i).m_eVector.serialize(memPtr->m_parentComToThisComOffset); - getLink(i).m_dVector.serialize(memPtr->m_thisPivotToThisComOffset); - getLink(i).m_zeroRotParentToThis.serialize(memPtr->m_zeroRotParentToThis); - btAssert(memPtr->m_dofCount<=3); - for (int dof = 0;dof<getLink(i).m_dofCount;dof++) - { - getLink(i).getAxisBottom(dof).serialize(memPtr->m_jointAxisBottom[dof]); - getLink(i).getAxisTop(dof).serialize(memPtr->m_jointAxisTop[dof]); - - memPtr->m_jointTorque[dof] = getLink(i).m_jointTorque[dof]; - memPtr->m_jointVel[dof] = getJointVelMultiDof(i)[dof]; - - } - int numPosVar = getLink(i).m_posVarCount; - for (int posvar = 0; posvar < numPosVar;posvar++) - { - memPtr->m_jointPos[posvar] = getLink(i).m_jointPos[posvar]; - } - - - { - char* name = (char*) serializer->findNameForPointer(m_links[i].m_linkName); - memPtr->m_linkName = (char*)serializer->getUniquePointer(name); - if (memPtr->m_linkName) - { - serializer->serializeName(name); - } - } - { - char* name = (char*) serializer->findNameForPointer(m_links[i].m_jointName); - memPtr->m_jointName = (char*)serializer->getUniquePointer(name); - if (memPtr->m_jointName) - { - serializer->serializeName(name); - } - } - memPtr->m_linkCollider = (btCollisionObjectData*)serializer->getUniquePointer(getLink(i).m_collider); - - } - serializer->finalizeChunk(chunk,btMultiBodyLinkDataName,BT_ARRAY_CODE,(void*) &m_links[0]); - } - mbd->m_links = mbd->m_numLinks? (btMultiBodyLinkData*) serializer->getUniquePointer((void*)&m_links[0]):0; - - // Fill padding with zeros to appease msan. -#ifdef BT_USE_DOUBLE_PRECISION - memset(mbd->m_padding, 0, sizeof(mbd->m_padding)); -#endif - - return btMultiBodyDataName; -} |