Program Listing for File centroidal-derivatives.hxx
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//
// Copyright (c) 2018-2019 INRIA
//
#ifndef __pinocchio_algorithm_centroidal_derivatives_hxx__
#define __pinocchio_algorithm_centroidal_derivatives_hxx__
#include "pinocchio/multibody/visitor.hpp"
#include "pinocchio/spatial/act-on-set.hpp"
#include "pinocchio/algorithm/kinematics.hpp"
#include "pinocchio/algorithm/check.hpp"
namespace pinocchio
{
template<typename Scalar, int Options, template<typename,int> class JointCollectionTpl,
typename ConfigVectorType, typename TangentVectorType1, typename TangentVectorType2>
struct CentroidalDynDerivativesForwardStep
: public fusion::JointUnaryVisitorBase<CentroidalDynDerivativesForwardStep<Scalar,Options,JointCollectionTpl,ConfigVectorType,TangentVectorType1,TangentVectorType2> >
{
typedef ModelTpl<Scalar,Options,JointCollectionTpl> Model;
typedef DataTpl<Scalar,Options,JointCollectionTpl> Data;
typedef typename Model::JointIndex JointIndex;
typedef boost::fusion::vector<const Model &,
Data &,
const ConfigVectorType &,
const TangentVectorType1 &,
const TangentVectorType2 &
> ArgsType;
template<typename JointModel>
static void algo(const JointModelBase<JointModel> & jmodel,
JointDataBase<typename JointModel::JointDataDerived> & jdata,
const Model & model,
Data & data,
const Eigen::MatrixBase<ConfigVectorType> & q,
const Eigen::MatrixBase<TangentVectorType1> & v,
const Eigen::MatrixBase<TangentVectorType2> & a)
{
typedef typename Model::JointIndex JointIndex;
typedef typename Data::Motion Motion;
const JointIndex & i = jmodel.id();
const JointIndex & parent = model.parents[i];
Motion & ov = data.ov[i];
Motion & oa = data.oa[i];
jmodel.calc(jdata.derived(),q.derived(),v.derived());
data.liMi[i] = model.jointPlacements[i]*jdata.M();
data.v[i] = jdata.v();
if(parent > 0)
{
data.oMi[i] = data.oMi[parent] * data.liMi[i];
data.v[i] += data.liMi[i].actInv(data.v[parent]);
}
else
data.oMi[i] = data.liMi[i];
data.a[i] = jdata.S() * jmodel.jointVelocitySelector(a) + jdata.c() + (data.v[i] ^ jdata.v());
if(parent > 0)
{
data.a[i] += data.liMi[i].actInv(data.a[parent]);
}
data.oYcrb[i] = data.oMi[i].act(model.inertias[i]);
ov = data.oMi[i].act(data.v[i]);
oa = data.oMi[i].act(data.a[i]);
data.oh[i] = data.oYcrb[i] * ov;
data.of[i] = data.oYcrb[i] * oa + ov.cross(data.oh[i]);
typedef typename SizeDepType<JointModel::NV>::template ColsReturn<typename Data::Matrix6x>::Type ColsBlock;
ColsBlock J_cols = jmodel.jointCols(data.J);
ColsBlock dJ_cols = jmodel.jointCols(data.dJ);
ColsBlock dVdq_cols = jmodel.jointCols(data.dVdq);
ColsBlock dAdq_cols = jmodel.jointCols(data.dAdq);
ColsBlock dAdv_cols = jmodel.jointCols(data.dAdv);
J_cols = data.oMi[i].act(jdata.S());
motionSet::motionAction(ov,J_cols,dJ_cols);
motionSet::motionAction(data.oa[parent],J_cols,dAdq_cols);
dAdv_cols = dJ_cols;
if(parent > 0)
{
motionSet::motionAction(data.ov[parent],J_cols,dVdq_cols);
motionSet::motionAction<ADDTO>(data.ov[parent],dVdq_cols,dAdq_cols);
dAdv_cols.noalias() += dVdq_cols;
}
else
{
dVdq_cols.setZero();
}
// computes variation of inertias
data.doYcrb[i] = data.oYcrb[i].variation(ov);
addForceCrossMatrix(data.oh[i],data.doYcrb[i]);
}
template<typename ForceDerived, typename M6>
static void addForceCrossMatrix(const ForceDense<ForceDerived> & f,
const Eigen::MatrixBase<M6> & mout)
{
M6 & mout_ = PINOCCHIO_EIGEN_CONST_CAST(M6,mout);
addSkew(-f.linear(),mout_.template block<3,3>(ForceDerived::LINEAR,ForceDerived::ANGULAR));
addSkew(-f.linear(),mout_.template block<3,3>(ForceDerived::ANGULAR,ForceDerived::LINEAR));
addSkew(-f.angular(),mout_.template block<3,3>(ForceDerived::ANGULAR,ForceDerived::ANGULAR));
}
}; // struct CentroidalDynDerivativesForwardStep
template<typename Scalar, int Options, template<typename,int> class JointCollectionTpl>
struct CentroidalDynDerivativesBackwardStep
: public fusion::JointUnaryVisitorBase<CentroidalDynDerivativesBackwardStep<Scalar,Options,JointCollectionTpl> >
{
typedef ModelTpl<Scalar,Options,JointCollectionTpl> Model;
typedef DataTpl<Scalar,Options,JointCollectionTpl> Data;
typedef boost::fusion::vector<const Model &,
Data &
> ArgsType;
template<typename JointModel>
static void algo(const JointModelBase<JointModel> & jmodel,
const Model & model,
Data & data)
{
typedef typename Model::JointIndex JointIndex;
const JointIndex & i = jmodel.id();
const JointIndex & parent = model.parents[i];
typedef typename SizeDepType<JointModel::NV>::template ColsReturn<typename Data::Matrix6x>::Type ColsBlock;
ColsBlock J_cols = jmodel.jointCols(data.J);
ColsBlock dVdq_cols = jmodel.jointCols(data.dVdq);
ColsBlock dAdq_cols = jmodel.jointCols(data.dAdq);
ColsBlock dAdv_cols = jmodel.jointCols(data.dAdv);
ColsBlock dHdq_cols = jmodel.jointCols(data.dHdq);
ColsBlock dFdq_cols = jmodel.jointCols(data.dFdq);
ColsBlock dFdv_cols = jmodel.jointCols(data.dFdv);
ColsBlock dFda_cols = jmodel.jointCols(data.dFda);
// tau
jmodel.jointVelocitySelector(data.tau).noalias() = J_cols.transpose()*data.of[i].toVector();
// dtau/da similar to data.M
motionSet::inertiaAction(data.oYcrb[i],J_cols,dFda_cols);
// dtau/dv
dFdv_cols.noalias() = data.doYcrb[i] * J_cols;
motionSet::inertiaAction<ADDTO>(data.oYcrb[i],dAdv_cols,dFdv_cols);
// dtau/dq
if(parent>0)
{
dFdq_cols.noalias() = data.doYcrb[i] * dVdq_cols;
motionSet::inertiaAction<ADDTO>(data.oYcrb[i],dAdq_cols,dFdq_cols);
}
else
motionSet::inertiaAction(data.oYcrb[i],dAdq_cols,dFdq_cols);
motionSet::act<ADDTO>(J_cols,data.of[i],dFdq_cols);
data.oYcrb[parent] += data.oYcrb[i];
data.doYcrb[parent] += data.doYcrb[i];
data.oh[parent] += data.oh[i];
data.of[parent] += data.of[i];
motionSet::act(J_cols, data.oh[i], dHdq_cols);
motionSet::inertiaAction<ADDTO>(data.oYcrb[i], dVdq_cols, dHdq_cols);
}
template<typename Min, typename Mout>
static void lhsInertiaMult(const typename Data::Inertia & Y,
const Eigen::MatrixBase<Min> & J,
const Eigen::MatrixBase<Mout> & F)
{
Mout & F_ = PINOCCHIO_EIGEN_CONST_CAST(Mout,F);
motionSet::inertiaAction(Y,J.derived().transpose(),F_.transpose());
}
}; // struct CentroidalDynDerivativesBackwardStep
namespace
{
// TODO: should be moved to ForceSet
template<typename Matrix6xLikeIn, typename Vector3Like, typename Matrix6xLikeOut>
inline void translateForceSet(const Eigen::MatrixBase<Matrix6xLikeIn> & Fin,
const Eigen::MatrixBase<Vector3Like> & v3,
const Eigen::MatrixBase<Matrix6xLikeOut> & Fout)
{
EIGEN_STATIC_ASSERT_MATRIX_SPECIFIC_SIZE(Matrix6xLikeIn,6,Eigen::Dynamic)
EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(Vector3Like,3)
EIGEN_STATIC_ASSERT_MATRIX_SPECIFIC_SIZE(Matrix6xLikeOut,6,Eigen::Dynamic)
PINOCCHIO_CHECK_ARGUMENT_SIZE(Fin.cols(), Fout.cols(), "Fin and Fout do not have the same number of columns");
for(Eigen::DenseIndex k = 0; k < Fin.cols(); ++k)
{
typedef ForceRef<typename Matrix6xLikeIn::ColXpr> ForceTypeIn;
typedef ForceRef<typename Matrix6xLikeOut::ColXpr> ForceTypeOut;
ForceTypeOut fout(PINOCCHIO_EIGEN_CONST_CAST(Matrix6xLikeOut,Fout).col(k));
const ForceTypeIn fin(PINOCCHIO_EIGEN_CONST_CAST(Matrix6xLikeIn,Fin).col(k));
fout.linear() = fin.linear();
fout.angular().noalias() = fin.angular() - v3.cross(fin.linear());
}
}
} // internal namespace
template<typename Scalar, int Options, template<typename,int> class JointCollectionTpl,
typename ConfigVectorType, typename TangentVectorType1, typename TangentVectorType2,
typename Matrix6xLike0, typename Matrix6xLike1, typename Matrix6xLike2, typename Matrix6xLike3>
inline void
computeCentroidalDynamicsDerivatives(const ModelTpl<Scalar,Options,JointCollectionTpl> & model,
DataTpl<Scalar,Options,JointCollectionTpl> & data,
const Eigen::MatrixBase<ConfigVectorType> & q,
const Eigen::MatrixBase<TangentVectorType1> & v,
const Eigen::MatrixBase<TangentVectorType2> & a,
const Eigen::MatrixBase<Matrix6xLike0> & dh_dq,
const Eigen::MatrixBase<Matrix6xLike1> & dhdot_dq,
const Eigen::MatrixBase<Matrix6xLike2> & dhdot_dv,
const Eigen::MatrixBase<Matrix6xLike3> & dhdot_da)
{
PINOCCHIO_CHECK_ARGUMENT_SIZE(q.size(), model.nq, "The joint configuration vector is not of right size");
PINOCCHIO_CHECK_ARGUMENT_SIZE(v.size(), model.nv, "The joint velocity vector is not of right size");
PINOCCHIO_CHECK_ARGUMENT_SIZE(a.size(), model.nv, "The joint acceleration vector is not of right size");
PINOCCHIO_CHECK_ARGUMENT_SIZE(dh_dq.cols(), model.nv);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dh_dq.rows(), 6);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_dq.cols(), model.nv);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_dq.rows(), 6);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_dv.cols(), model.nv);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_dv.rows(), 6);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_da.cols(), model.nv);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_da.rows(), 6);
assert(model.check(data) && "data is not consistent with model.");
typedef ModelTpl<Scalar,Options,JointCollectionTpl> Model;
typedef DataTpl<Scalar,Options,JointCollectionTpl> Data;
typedef typename Model::JointIndex JointIndex;
typedef CentroidalDynDerivativesForwardStep<Scalar,Options,JointCollectionTpl,ConfigVectorType,TangentVectorType1,TangentVectorType2> Pass1;
for(JointIndex i=1; i<(JointIndex) model.njoints; ++i)
{
Pass1::run(model.joints[i],data.joints[i],
typename Pass1::ArgsType(model,data,q.derived(),v.derived(),a.derived()));
}
data.oYcrb[0].setZero();
data.oh[0].setZero();
data.of[0].setZero();
typedef CentroidalDynDerivativesBackwardStep<Scalar,Options,JointCollectionTpl> Pass2;
for(JointIndex i=(JointIndex)(model.njoints-1); i>0; --i)
{
Pass2::run(model.joints[i],typename Pass2::ArgsType(model,data));
}
// expressed all the quantities around the center of mass
typedef typename Data::Inertia Inertia;
const Inertia & Ytot = data.oYcrb[0];
const typename Inertia::Vector3 & com = Ytot.lever();
// Mass of the system
data.mass[0] = Ytot.mass();
// Center of mass of the system
data.com[0] = Ytot.lever();
// Compute the centroidal quantities
data.hg = data.oh[0];
data.hg.angular() += data.hg.linear().cross(com);
data.dhg = data.of[0];
data.dhg.angular() += data.dhg.linear().cross(com);
// Compute centroidal inertia
data.Ig.mass() = Ytot.mass();
data.Ig.lever().setZero();
data.Ig.inertia() = Ytot.inertia();
// Compute the partial derivatives
translateForceSet(data.dHdq,com,dh_dq.const_cast_derived());
Matrix6xLike0 & dh_dq_ = dh_dq.const_cast_derived();
for(Eigen::DenseIndex k = 0; k < model.nv; ++k)
dh_dq_.col(k).template segment<3>(Force::ANGULAR) += data.hg.linear().cross(data.dFda.col(k).template segment<3>(Force::LINEAR))/Ytot.mass();
translateForceSet(data.dFdq,com,dhdot_dq.const_cast_derived());
Matrix6xLike1 & dhdot_dq_ = dhdot_dq.const_cast_derived();
for(Eigen::DenseIndex k = 0; k < model.nv; ++k)
dhdot_dq_.col(k).template segment<3>(Force::ANGULAR) += data.dhg.linear().cross(data.dFda.col(k).template segment<3>(Force::LINEAR))/Ytot.mass();
translateForceSet(data.dFdv,com,PINOCCHIO_EIGEN_CONST_CAST(Matrix6xLike2,dhdot_dv));
translateForceSet(data.dFda,com,PINOCCHIO_EIGEN_CONST_CAST(Matrix6xLike3,dhdot_da));
}
template<typename Scalar, int Options, template<typename,int> class JointCollectionTpl>
struct GetCentroidalDynDerivativesBackwardStep
: public fusion::JointUnaryVisitorBase<GetCentroidalDynDerivativesBackwardStep<Scalar,Options,JointCollectionTpl> >
{
typedef ModelTpl<Scalar,Options,JointCollectionTpl> Model;
typedef DataTpl<Scalar,Options,JointCollectionTpl> Data;
typedef boost::fusion::vector<const Model &,
Data &
> ArgsType;
template<typename JointModel>
static void algo(const JointModelBase<JointModel> & jmodel,
const Model & model,
Data & data)
{
typedef typename Model::JointIndex JointIndex;
typedef typename Data::Vector3 Vector3;
typedef typename SizeDepType<JointModel::NV>::template ColsReturn<typename Data::Matrix6x>::Type ColsBlock;
const JointIndex & i = jmodel.id();
const JointIndex & parent = model.parents[i];
typename Data::Motion & vtmp = data.v[0];
typename Data::Matrix6x & Ftmp = data.Fcrb[0];
ColsBlock J_cols = jmodel.jointCols(data.J);
ColsBlock dVdq_cols = jmodel.jointCols(data.dVdq);
ColsBlock dHdq_cols = jmodel.jointCols(data.dHdq);
ColsBlock Ftmp_cols = jmodel.jointCols(Ftmp);
const Vector3 mg = data.oYcrb[i].mass() * model.gravity.linear();
for(Eigen::DenseIndex k = 0; k < jmodel.nv(); ++k)
{
MotionRef<typename ColsBlock::ColXpr> mref(J_cols.col(k));
vtmp.linear() = mref.linear() + mref.angular().cross(data.oYcrb[i].lever());
ForceRef<typename ColsBlock::ColXpr> fout(Ftmp_cols.col(k));
fout.angular() += vtmp.linear().cross(mg);
}
data.oh[parent] += data.oh[i];
if(parent == 0)
{
data.of[0] += data.of[i];
data.oYcrb[0] += data.oYcrb[i];
}
motionSet::act(J_cols, data.oh[i], dHdq_cols);
motionSet::inertiaAction<ADDTO>(data.oYcrb[i], dVdq_cols, dHdq_cols);
}
}; // struct GetCentroidalDynDerivativesBackwardStep
template<typename Scalar, int Options, template<typename,int> class JointCollectionTpl,
typename Matrix6xLike0, typename Matrix6xLike1, typename Matrix6xLike2, typename Matrix6xLike3>
inline void
getCentroidalDynamicsDerivatives(const ModelTpl<Scalar,Options,JointCollectionTpl> & model,
DataTpl<Scalar,Options,JointCollectionTpl> & data,
const Eigen::MatrixBase<Matrix6xLike0> & dh_dq,
const Eigen::MatrixBase<Matrix6xLike1> & dhdot_dq,
const Eigen::MatrixBase<Matrix6xLike2> & dhdot_dv,
const Eigen::MatrixBase<Matrix6xLike3> & dhdot_da)
{
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_dq.cols(), model.nv);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_dq.rows(), 6);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_dv.cols(), model.nv);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_dv.rows(), 6);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_da.cols(), model.nv);
PINOCCHIO_CHECK_ARGUMENT_SIZE(dhdot_da.rows(), 6);
assert(model.check(data) && "data is not consistent with model.");
typedef ModelTpl<Scalar,Options,JointCollectionTpl> Model;
typedef DataTpl<Scalar,Options,JointCollectionTpl> Data;
typedef typename Model::JointIndex JointIndex;
// compute first data.oh[0] and data.of[0]
data.oh[0].setZero(); data.of[0].setZero(); data.oYcrb[0].setZero();
typename Data::Matrix6x & Ftmp = data.Fcrb[0];
Ftmp = data.dFdq;
typedef GetCentroidalDynDerivativesBackwardStep<Scalar,Options,JointCollectionTpl> Pass2;
for(JointIndex i=(JointIndex)(model.njoints-1); i>0; --i)
{
Pass2::run(model.joints[i],typename Pass2::ArgsType(model,data));
}
typedef typename Data::Inertia Inertia;
const Inertia & Ytot = data.oYcrb[0];
const typename Inertia::Vector3 & com = Ytot.lever();
// Center of mass of the system
data.com[0] = com;
data.mass[0] = Ytot.mass();
// Remove the gravity contribution
data.of[0] += Ytot * model.gravity;
// Compute the centroidal quantities
data.hg = data.oh[0];
data.hg.angular() += data.hg.linear().cross(com);
data.dhg = data.of[0];
data.dhg.angular() += data.dhg.linear().cross(com);
// Compute centroidal inertia
data.Ig.mass() = Ytot.mass();
data.Ig.lever().setZero();
data.Ig.inertia() = Ytot.inertia();
// Retrieve the partial derivatives from RNEA derivatives
translateForceSet(data.dHdq,com,dh_dq.const_cast_derived());
Matrix6xLike0 & dh_dq_ = dh_dq.const_cast_derived();
for(Eigen::DenseIndex k = 0; k < model.nv; ++k)
dh_dq_.col(k).template segment<3>(Force::ANGULAR) += data.hg.linear().cross(data.dFda.col(k).template segment<3>(Force::LINEAR))/Ytot.mass();
translateForceSet(Ftmp,com,dhdot_dq.const_cast_derived());
Matrix6xLike1 & dhdot_dq_ = dhdot_dq.const_cast_derived();
for(Eigen::DenseIndex k = 0; k < model.nv; ++k)
dhdot_dq_.col(k).template segment<3>(Force::ANGULAR) += data.dhg.linear().cross(data.dFda.col(k).template segment<3>(Force::LINEAR))/Ytot.mass();
translateForceSet(data.dFdv,com,PINOCCHIO_EIGEN_CONST_CAST(Matrix6xLike2,dhdot_dv));
translateForceSet(data.dFda,com,PINOCCHIO_EIGEN_CONST_CAST(Matrix6xLike3,dhdot_da));
}
} // namespace pinocchio
#endif // ifndef __pinocchio_algorithm_centroidal_derivatives_hxx__