expose-kinematics-derivatives.cpp

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//
// Copyright (c) 2018-2021 CNRS INRIA
//
 
#include "pinocchio/bindings/python/algorithm/algorithms.hpp"
#include "pinocchio/algorithm/kinematics-derivatives.hpp"
#include "pinocchio/algorithm/center-of-mass-derivatives.hpp"
 
#include <boost/python/tuple.hpp>
 
namespace pinocchio
{
  namespace python
  {
    namespace bp = boost::python;
 
    bp::tuple getJointVelocityDerivatives_proxy(
      const context::Model & model,
      context::Data & data,
      const JointIndex jointId,
      ReferenceFrame rf)
    {
      typedef context::Data::Matrix6x Matrix6x;
 
      Matrix6x partial_dq(Matrix6x::Zero(6, model.nv));
      Matrix6x partial_dv(Matrix6x::Zero(6, model.nv));
 
      getJointVelocityDerivatives(model, data, jointId, rf, partial_dq, partial_dv);
 
      return bp::make_tuple(partial_dq, partial_dv);
    }
 
    bp::tuple getPointVelocityDerivatives_proxy(
      const context::Model & model,
      context::Data & data,
      const JointIndex joint_id,
      const context::SE3 & placement,
      ReferenceFrame rf)
    {
      typedef context::Data::Matrix3x Matrix3x;
 
      Matrix3x v_partial_dq(Matrix3x::Zero(3, model.nv));
      Matrix3x v_partial_dv(Matrix3x::Zero(3, model.nv));
 
      getPointVelocityDerivatives(model, data, joint_id, placement, rf, v_partial_dq, v_partial_dv);
 
      return bp::make_tuple(v_partial_dq, v_partial_dv);
    }
 
    bp::tuple getJointAccelerationDerivatives_proxy(
      const context::Model & model,
      context::Data & data,
      const JointIndex jointId,
      ReferenceFrame rf)
    {
      typedef context::Data::Matrix6x Matrix6x;
 
      Matrix6x v_partial_dq(Matrix6x::Zero(6, model.nv));
      Matrix6x a_partial_dq(Matrix6x::Zero(6, model.nv));
      Matrix6x a_partial_dv(Matrix6x::Zero(6, model.nv));
      Matrix6x a_partial_da(Matrix6x::Zero(6, model.nv));
 
      getJointAccelerationDerivatives(
        model, data, jointId, rf, v_partial_dq, a_partial_dq, a_partial_dv, a_partial_da);
 
      return bp::make_tuple(v_partial_dq, a_partial_dq, a_partial_dv, a_partial_da);
    }
 
    bp::tuple getPointClassicAccelerationDerivatives_proxy(
      const context::Model & model,
      context::Data & data,
      const JointIndex joint_id,
      const context::SE3 & placement,
      ReferenceFrame rf)
    {
      typedef context::Data::Matrix3x Matrix3x;
 
      Matrix3x v_partial_dq(Matrix3x::Zero(3, model.nv));
      Matrix3x a_partial_dq(Matrix3x::Zero(3, model.nv));
      Matrix3x a_partial_dv(Matrix3x::Zero(3, model.nv));
      Matrix3x a_partial_da(Matrix3x::Zero(3, model.nv));
 
      getPointClassicAccelerationDerivatives(
        model, data, joint_id, placement, rf, v_partial_dq, a_partial_dq, a_partial_dv,
        a_partial_da);
 
      return bp::make_tuple(v_partial_dq, a_partial_dq, a_partial_dv, a_partial_da);
    }
 
    context::Data::Matrix3x
    getCoMVelocityDerivatives_proxy(const context::Model & model, context::Data & data)
    {
      typedef context::Data::Matrix3x Matrix3x;
      Matrix3x partial_dq(Matrix3x::Zero(3, model.nv));
      getCenterOfMassVelocityDerivatives(model, data, partial_dq);
      return partial_dq;
    }
 
    void exposeKinematicsDerivatives()
    {
      typedef context::Scalar Scalar;
      typedef context::VectorXs VectorXs;
      enum
      {
        Options = context::Options
      };
 
      bp::def(
        "computeForwardKinematicsDerivatives",
        &computeForwardKinematicsDerivatives<
          Scalar, Options, JointCollectionDefaultTpl, VectorXs, VectorXs, VectorXs>,
        bp::args("model", "data", "q", "v", "a"),
        "Computes all the terms required to compute the derivatives of the placement, "
        "spatial velocity and acceleration\n"
        "for any joint of the model.\n"
        "The results are stored in data.\n\n"
        "Parameters:\n"
        "\tmodel: model of the kinematic tree\n"
        "\tdata: data related to the model\n"
        "\tq: the joint configuration vector (size model.nq)\n"
        "\tv: the joint velocity vector (size model.nv)\n"
        "\ta: the joint acceleration vector (size model.nv)\n");
 
      bp::def(
        "getJointVelocityDerivatives", getJointVelocityDerivatives_proxy,
        bp::args("model", "data", "joint_id", "reference_frame"),
        "Computes the partial derivatives of the spatial velocity of a given joint with respect "
        "to\n"
        "the joint configuration and velocity and returns them as a tuple.\n"
        "The partial derivatives can be either expressed in the LOCAL frame of the joint, in the "
        "LOCAL_WORLD_ALIGNED frame or in the WORLD coordinate frame depending on the value of "
        "reference_frame.\n"
        "You must first call computeForwardKinematicsDerivatives before calling this function.\n\n"
        "Parameters:\n"
        "\tmodel: model of the kinematic tree\n"
        "\tdata: data related to the model\n"
        "\tjoint_id: index of the joint\n"
        "\treference_frame: reference frame in which the resulting derivatives are expressed\n");
 
      bp::def(
        "getPointVelocityDerivatives", getPointVelocityDerivatives_proxy,
        bp::args("model", "data", "joint_id", "placement", "reference_frame"),
        "Computes the partial derivatives of the velocity of a point given by its placement "
        "information w.r.t. the joint frame and returns them as a tuple.\n"
        "The partial derivatives can be either expressed in the LOCAL frame of the joint, in the "
        "LOCAL_WORLD_ALIGNED frame or in the WORLD coordinate frame depending on the value of "
        "reference_frame.\n"
        "You must first call computeForwardKinematicsDerivatives before calling this function.\n\n"
        "Parameters:\n"
        "\tmodel: model of the kinematic tree\n"
        "\tdata: data related to the model\n"
        "\tjoint_id: index of the joint\n"
        "\tplacement: relative placement of the point w.r.t. the joint frame\n"
        "\treference_frame: reference frame in which the resulting derivatives are expressed\n");
 
      bp::def(
        "getPointClassicAccelerationDerivatives", getPointClassicAccelerationDerivatives_proxy,
        bp::args("model", "data", "joint_id", "placement", "reference_frame"),
        "Computes the partial derivatives of the classic acceleration of a point given by its "
        "placement information w.r.t. the joint frame and returns them as a tuple.\n"
        "The partial derivatives can be either expressed in the LOCAL frame of the joint, in the "
        "LOCAL_WORLD_ALIGNED frame or in the WORLD coordinate frame depending on the value of "
        "reference_frame.\n"
        "You must first call computeForwardKinematicsDerivatives before calling this function.\n\n"
        "Parameters:\n"
        "\tmodel: model of the kinematic tree\n"
        "\tdata: data related to the model\n"
        "\tjoint_id: index of the joint\n"
        "\tplacement: relative placement of the point w.r.t. the joint frame\n"
        "\treference_frame: reference frame in which the resulting derivatives are expressed\n");
 
      bp::def(
        "getJointAccelerationDerivatives", getJointAccelerationDerivatives_proxy,
        bp::args("model", "data", "joint_id", "reference_frame"),
        "Computes the partial derivatives of the spatial acceleration of a given joint with "
        "respect to\n"
        "the joint configuration, velocity and acceleration and returns them as a tuple.\n"
        "The partial derivatives can be either expressed in the LOCAL frame of the joint, in the "
        "LOCAL_WORLD_ALIGNED frame or in the WORLD coordinate frame depending on the value of "
        "reference_frame.\n"
        "You must first call computeForwardKinematicsDerivatives before calling this function.\n\n"
        "Parameters:\n"
        "\tmodel: model of the kinematic tree\n"
        "\tdata: data related to the model\n"
        "\tjoint_id: index of the joint\n"
        "\treference_frame: reference frame in which the resulting derivatives are expressed\n");
 
      bp::def(
        "getCenterOfMassVelocityDerivatives", getCoMVelocityDerivatives_proxy,
        bp::args("model", "data"),
        "Computes the partial derivaties of the center of mass velocity with respect to\n"
        "the joint configuration.\n"
        "You must first call computeAllTerms(model,data,q,v) or centerOfMass(model,data,q,v) "
        "before calling this function.\n\n"
        "Parameters:\n"
        "\tmodel: model of the kinematic tree\n"
        "\tdata: data related to the model\n");
    }
 
  } // namespace python
} // namespace pinocchio