joint-planar.cpp

Go to the documentation of this file.

//
// Copyright (c) 2015-2020 CNRS INRIA
// Copyright (c) 2015 Wandercraft, 86 rue de Paris 91400 Orsay, France.
//
 
#include "pinocchio/math/fwd.hpp"
#include "pinocchio/multibody/joint/joints.hpp"
#include "pinocchio/algorithm/rnea.hpp"
#include "pinocchio/algorithm/aba.hpp"
#include "pinocchio/algorithm/crba.hpp"
#include "pinocchio/algorithm/jacobian.hpp"
#include "pinocchio/algorithm/compute-all-terms.hpp"
 
#include <boost/test/unit_test.hpp>
#include <iostream>
 
using namespace pinocchio;
 
template<typename D>
void addJointAndBody(
  Model & model,
  const JointModelBase<D> & jmodel,
  const Model::JointIndex parent_id,
  const SE3 & joint_placement,
  const std::string & joint_name,
  const Inertia & Y)
{
  Model::JointIndex idx;
 
  idx = model.addJoint(parent_id, jmodel, joint_placement, joint_name);
  model.appendBodyToJoint(idx, Y);
}
 
BOOST_AUTO_TEST_SUITE(JointPlanar)
 
BOOST_AUTO_TEST_CASE(spatial)
{
  SE3 M(SE3::Random());
  Motion v(Motion::Random());
 
  MotionPlanar mp(1., 2., 3.);
  Motion mp_dense(mp);
 
  BOOST_CHECK(M.act(mp).isApprox(M.act(mp_dense)));
  BOOST_CHECK(M.actInv(mp).isApprox(M.actInv(mp_dense)));
 
  BOOST_CHECK(v.cross(mp).isApprox(v.cross(mp_dense)));
}
 
BOOST_AUTO_TEST_CASE(vsFreeFlyer)
{
  using namespace pinocchio;
  typedef SE3::Vector3 Vector3;
  typedef Eigen::Matrix<double, 6, 1> Vector6;
  typedef Eigen::Matrix<double, 4, 1> VectorPl;
  typedef Eigen::Matrix<double, 7, 1> VectorFF;
  typedef SE3::Matrix3 Matrix3;
 
  Model modelPlanar, modelFreeflyer;
 
  Inertia inertia(1., Vector3(0.5, 0., 0.0), Matrix3::Identity());
  SE3 pos(1);
  pos.translation() = SE3::LinearType(1., 0., 0.);
 
  addJointAndBody(modelPlanar, JointModelPlanar(), 0, SE3::Identity(), "planar", inertia);
  addJointAndBody(modelFreeflyer, JointModelFreeFlyer(), 0, SE3::Identity(), "free-flyer", inertia);
 
  Data dataPlanar(modelPlanar);
  Data dataFreeFlyer(modelFreeflyer);
 
  VectorPl q;
  q << 1, 1, 0, 1; // Angle is PI /2;
  VectorFF qff;
  qff << 1, 1, 0, 0, 0, sqrt(2) / 2, sqrt(2) / 2;
  Eigen::VectorXd v = Eigen::VectorXd::Ones(modelPlanar.nv);
  Vector6 vff;
  vff << 1, 1, 0, 0, 0, 1;
  Eigen::VectorXd tauPlanar = Eigen::VectorXd::Ones(modelPlanar.nv);
  Eigen::VectorXd tauff = Eigen::VectorXd::Ones(modelFreeflyer.nv);
  Eigen::VectorXd aPlanar = Eigen::VectorXd::Ones(modelPlanar.nv);
  Eigen::VectorXd aff(vff);
 
  forwardKinematics(modelPlanar, dataPlanar, q, v);
  forwardKinematics(modelFreeflyer, dataFreeFlyer, qff, vff);
 
  computeAllTerms(modelPlanar, dataPlanar, q, v);
  computeAllTerms(modelFreeflyer, dataFreeFlyer, qff, vff);
 
  BOOST_CHECK(dataFreeFlyer.oMi[1].isApprox(dataPlanar.oMi[1]));
  BOOST_CHECK(dataFreeFlyer.liMi[1].isApprox(dataPlanar.liMi[1]));
  BOOST_CHECK(dataFreeFlyer.Ycrb[1].matrix().isApprox(dataPlanar.Ycrb[1].matrix()));
  BOOST_CHECK(dataFreeFlyer.f[1].toVector().isApprox(dataPlanar.f[1].toVector()));
 
  Eigen::VectorXd nle_expected_ff(3);
  nle_expected_ff << dataFreeFlyer.nle[0], dataFreeFlyer.nle[1], dataFreeFlyer.nle[5];
  BOOST_CHECK(nle_expected_ff.isApprox(dataPlanar.nle));
  BOOST_CHECK(dataFreeFlyer.com[0].isApprox(dataPlanar.com[0]));
 
  // InverseDynamics == rnea
  tauPlanar = rnea(modelPlanar, dataPlanar, q, v, aPlanar);
  tauff = rnea(modelFreeflyer, dataFreeFlyer, qff, vff, aff);
 
  Vector3 tau_expected;
  tau_expected << tauff(0), tauff(1), tauff(5);
  BOOST_CHECK(tauPlanar.isApprox(tau_expected));
 
  // ForwardDynamics == aba
  Eigen::VectorXd aAbaPlanar = aba(modelPlanar, dataPlanar, q, v, tauPlanar, Convention::WORLD);
  Eigen::VectorXd aAbaFreeFlyer =
    aba(modelFreeflyer, dataFreeFlyer, qff, vff, tauff, Convention::WORLD);
  Vector3 a_expected;
  a_expected << aAbaFreeFlyer[0], aAbaFreeFlyer[1], aAbaFreeFlyer[5];
  BOOST_CHECK(aAbaPlanar.isApprox(a_expected));
 
  // crba
  crba(modelPlanar, dataPlanar, q, Convention::WORLD);
  crba(modelFreeflyer, dataFreeFlyer, qff, Convention::WORLD);
 
  Eigen::Matrix<double, 3, 3> M_expected;
  M_expected.block<2, 2>(0, 0) = dataFreeFlyer.M.block<2, 2>(0, 0);
  M_expected.block<1, 2>(2, 0) = dataFreeFlyer.M.block<1, 2>(5, 0);
  M_expected.block<2, 1>(0, 2) = dataFreeFlyer.M.col(5).head<2>();
  M_expected.block<1, 1>(2, 2) = dataFreeFlyer.M.col(5).tail<1>();
 
  BOOST_CHECK(dataPlanar.M.isApprox(M_expected));
 
  // Jacobian
  Eigen::Matrix<double, 6, Eigen::Dynamic> jacobian_planar;
  jacobian_planar.resize(6, 3);
  jacobian_planar.setZero();
  Eigen::Matrix<double, 6, Eigen::Dynamic> jacobian_ff;
  jacobian_ff.resize(6, 6);
  jacobian_ff.setZero();
  computeJointJacobians(modelPlanar, dataPlanar, q);
  computeJointJacobians(modelFreeflyer, dataFreeFlyer, qff);
  getJointJacobian(modelPlanar, dataPlanar, 1, LOCAL, jacobian_planar);
  getJointJacobian(modelFreeflyer, dataFreeFlyer, 1, LOCAL, jacobian_ff);
 
  Eigen::Matrix<double, 6, 3> jacobian_expected;
  jacobian_expected << jacobian_ff.col(0), jacobian_ff.col(1), jacobian_ff.col(5);
 
  BOOST_CHECK(jacobian_planar.isApprox(jacobian_expected));
}
 
BOOST_AUTO_TEST_SUITE_END()