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/////////////////////////////////////////////////////////////////////////////// |
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// BSD 3-Clause License |
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// |
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// Copyright (C) 2019-2023, LAAS-CNRS, University of Edinburgh, |
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// Heriot-Watt University |
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// Copyright note valid unless otherwise stated in individual files. |
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// All rights reserved. |
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/////////////////////////////////////////////////////////////////////////////// |
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#ifndef CROCODDYL_MULTIBODY_CONTACTS_MULTIPLE_CONTACTS_HPP_ |
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#define CROCODDYL_MULTIBODY_CONTACTS_MULTIPLE_CONTACTS_HPP_ |
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#include <map> |
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#include <set> |
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#include <string> |
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#include <utility> |
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#include "crocoddyl/core/utils/exception.hpp" |
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#include "crocoddyl/multibody/contact-base.hpp" |
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#include "crocoddyl/multibody/fwd.hpp" |
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namespace crocoddyl { |
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template <typename _Scalar> |
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struct ContactItemTpl { |
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EIGEN_MAKE_ALIGNED_OPERATOR_NEW |
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typedef _Scalar Scalar; |
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typedef ContactModelAbstractTpl<Scalar> ContactModelAbstract; |
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ContactItemTpl() {} |
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ContactItemTpl(const std::string& name, |
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boost::shared_ptr<ContactModelAbstract> contact, |
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const bool active = true) |
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: name(name), contact(contact), active(active) {} |
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/** |
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* @brief Print information on the contact item |
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*/ |
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friend std::ostream& operator<<(std::ostream& os, |
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const ContactItemTpl<Scalar>& model) { |
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os << "{" << *model.contact << "}"; |
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return os; |
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} |
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std::string name; |
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boost::shared_ptr<ContactModelAbstract> contact; |
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bool active; |
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}; |
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/** |
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* @brief Define a stack of contact models |
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* |
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* The contact models can be defined with active and inactive status. The idea |
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* behind this design choice is to be able to create a mechanism that allocates |
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* the entire data needed for the computations. Then, there are designed |
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* routines that update the only active contacts. |
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*/ |
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template <typename _Scalar> |
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class ContactModelMultipleTpl { |
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public: |
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EIGEN_MAKE_ALIGNED_OPERATOR_NEW |
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typedef _Scalar Scalar; |
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typedef MathBaseTpl<Scalar> MathBase; |
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typedef StateMultibodyTpl<Scalar> StateMultibody; |
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typedef ContactDataAbstractTpl<Scalar> ContactDataAbstract; |
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typedef ContactDataMultipleTpl<Scalar> ContactDataMultiple; |
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typedef ContactModelAbstractTpl<Scalar> ContactModelAbstract; |
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typedef ContactItemTpl<Scalar> ContactItem; |
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typedef typename MathBase::Vector2s Vector2s; |
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typedef typename MathBase::Vector3s Vector3s; |
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typedef typename MathBase::VectorXs VectorXs; |
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typedef typename MathBase::MatrixXs MatrixXs; |
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typedef std::map<std::string, boost::shared_ptr<ContactItem> > |
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ContactModelContainer; |
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typedef std::map<std::string, boost::shared_ptr<ContactDataAbstract> > |
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ContactDataContainer; |
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typedef typename pinocchio::container::aligned_vector< |
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pinocchio::ForceTpl<Scalar> >::iterator ForceIterator; |
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/** |
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* @brief Initialize the multi-contact model |
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* |
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* @param[in] state Multibody state |
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* @param[in] nu Dimension of control vector |
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*/ |
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ContactModelMultipleTpl(boost::shared_ptr<StateMultibody> state, |
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const std::size_t nu); |
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/** |
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* @brief Initialize the multi-contact model |
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* |
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* @param[in] state Multibody state |
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*/ |
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ContactModelMultipleTpl(boost::shared_ptr<StateMultibody> state); |
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~ContactModelMultipleTpl(); |
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/** |
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* @brief Add contact item |
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* |
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* Note that the memory is allocated for inactive contacts as well. |
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* |
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* @param[in] name Contact name |
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* @param[in] contact Contact model |
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* @param[in] active Contact status (active by default) |
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*/ |
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void addContact(const std::string& name, |
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boost::shared_ptr<ContactModelAbstract> contact, |
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const bool active = true); |
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/** |
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* @brief Remove contact item |
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* |
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* @param[in] name Contact name |
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*/ |
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void removeContact(const std::string& name); |
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/** |
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* @brief Change the contact status |
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* |
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* @param[in] name Contact name |
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* @param[in] active Contact status (True for active) |
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*/ |
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void changeContactStatus(const std::string& name, const bool active); |
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/** |
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* @brief Compute the contact Jacobian and contact acceleration |
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* |
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* @param[in] data Multi-contact data |
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* @param[in] x State point \f$\mathbf{x}\in\mathbb{R}^{ndx}\f$ |
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*/ |
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void calc(const boost::shared_ptr<ContactDataMultiple>& data, |
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const Eigen::Ref<const VectorXs>& x); |
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/** |
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* @brief Compute the derivatives of the contact holonomic constraint |
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* |
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* @param[in] data Multi-contact data |
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* @param[in] x State point \f$\mathbf{x}\in\mathbb{R}^{ndx}\f$ |
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*/ |
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void calcDiff(const boost::shared_ptr<ContactDataMultiple>& data, |
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const Eigen::Ref<const VectorXs>& x); |
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/** |
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* @brief Update the constrained system acceleration |
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* |
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* @param[in] data Multi-contact data |
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* @param[in] dv Constrained system acceleration |
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* \f$\dot{\mathbf{v}}\in\mathbb{R}^{nv}\f$ |
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*/ |
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void updateAcceleration(const boost::shared_ptr<ContactDataMultiple>& data, |
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const VectorXs& dv) const; |
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/** |
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* @brief Update the spatial force defined in frame coordinate |
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* |
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* @param[in] data Multi-contact data |
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* @param[in] force Spatial force defined in frame coordinate |
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* \f${}^o\underline{\boldsymbol{\lambda}}_c\in\mathbb{R}^{nc}\f$ |
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*/ |
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void updateForce(const boost::shared_ptr<ContactDataMultiple>& data, |
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const VectorXs& force); |
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/** |
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* @brief Update the Jacobian of the constrained system acceleration |
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* |
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* @param[in] data Multi-contact data |
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* @param[in] ddv_dx Jacobian of the system acceleration in generalized |
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* coordinates |
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* \f$\frac{\partial\dot{\mathbf{v}}}{\partial\mathbf{x}}\in\mathbb{R}^{nv\times |
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* ndx}\f$ |
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*/ |
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void updateAccelerationDiff( |
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const boost::shared_ptr<ContactDataMultiple>& data, |
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const MatrixXs& ddv_dx) const; |
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/** |
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* @brief Update the Jacobian of the spatial force defined in frame coordinate |
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* |
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* @param[in] data Multi-contact data |
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* @param[in] df_dx Jacobian of the spatial impulse defined in frame |
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* coordinate |
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* \f$\frac{\partial{}^o\underline{\boldsymbol{\lambda}}_c}{\partial\mathbf{x}}\in\mathbb{R}^{nc\times{ndx}}\f$ |
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* @param[in] df_du Jacobian of the spatial impulse defined in frame |
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* coordinate |
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* \f$\frac{\partial{}^o\underline{\boldsymbol{\lambda}}_c}{\partial\mathbf{u}}\in\mathbb{R}^{nc\times{nu}}\f$ |
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*/ |
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void updateForceDiff(const boost::shared_ptr<ContactDataMultiple>& data, |
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const MatrixXs& df_dx, const MatrixXs& df_du) const; |
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/** |
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* @brief Update the RNEA derivatives dtau_dq by adding the skew term |
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* (necessary for contacts expressed in LOCAL_WORLD_ALIGNED / WORLD) |
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* |
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* To learn more about the computation of the contact derivatives in different |
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* frames see https://hal.science/hal-03758989/document. |
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* |
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* @param[in] data Multi-contact data |
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* @param[in] pinocchio Pinocchio data |
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*/ |
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void updateRneaDiff(const boost::shared_ptr<ContactDataMultiple>& data, |
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pinocchio::DataTpl<Scalar>& pinocchio) const; |
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/** |
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* @brief Create the multi-contact data |
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* |
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* @param[in] data Pinocchio data |
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* @return the multi-contact data. |
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*/ |
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boost::shared_ptr<ContactDataMultiple> createData( |
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pinocchio::DataTpl<Scalar>* const data); |
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/** |
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* @brief Return the multibody state |
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*/ |
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const boost::shared_ptr<StateMultibody>& get_state() const; |
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/** |
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* @brief Return the contact models |
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*/ |
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const ContactModelContainer& get_contacts() const; |
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/** |
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* @brief Return the dimension of active contacts |
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*/ |
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std::size_t get_nc() const; |
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/** |
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* @brief Return the dimension of all contacts |
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*/ |
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std::size_t get_nc_total() const; |
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/** |
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* @brief Return the dimension of control vector |
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*/ |
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std::size_t get_nu() const; |
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/** |
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* @brief Return the names of the set of active contacts |
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*/ |
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const std::set<std::string>& get_active_set() const; |
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/** |
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* @brief Return the names of the set of inactive contacts |
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*/ |
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const std::set<std::string>& get_inactive_set() const; |
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/** |
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* @brief Return the status of a given contact name |
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*/ |
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bool getContactStatus(const std::string& name) const; |
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/** |
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* @brief Return the type of contact computation |
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* |
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* True for all contacts, otherwise false for active contacts |
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*/ |
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bool getComputeAllContacts() const; |
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/** |
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* @brief Set the tyoe of contact computation: all or active contacts |
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* |
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* @param status Type of contact computation (true for all contacts and false |
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* for active contacts) |
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*/ |
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void setComputeAllContacts(const bool status); |
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/** |
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* @brief Print information on the contact models |
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*/ |
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template <class Scalar> |
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friend std::ostream& operator<<(std::ostream& os, |
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const ContactModelMultipleTpl<Scalar>& model); |
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private: |
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boost::shared_ptr<StateMultibody> state_; |
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ContactModelContainer contacts_; |
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std::size_t nc_; |
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std::size_t nc_total_; |
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std::size_t nu_; |
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std::set<std::string> active_set_; |
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std::set<std::string> inactive_set_; |
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bool compute_all_contacts_; |
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}; |
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/** |
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* @brief Define the multi-contact data |
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* |
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* \sa ContactModelMultipleTpl |
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*/ |
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template <typename _Scalar> |
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struct ContactDataMultipleTpl { |
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EIGEN_MAKE_ALIGNED_OPERATOR_NEW |
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typedef _Scalar Scalar; |
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typedef MathBaseTpl<Scalar> MathBase; |
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typedef ContactModelMultipleTpl<Scalar> ContactModelMultiple; |
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typedef ContactItemTpl<Scalar> ContactItem; |
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typedef typename MathBase::VectorXs VectorXs; |
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typedef typename MathBase::MatrixXs MatrixXs; |
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/** |
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* @brief Initialized a multi-contact data |
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* |
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* @param[in] model Multi-contact model |
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* @param[in] data Pinocchio data |
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*/ |
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template <template <typename Scalar> class Model> |
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ContactDataMultipleTpl(Model<Scalar>* const model, |
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pinocchio::DataTpl<Scalar>* const data) |
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: Jc(model->get_nc_total(), model->get_state()->get_nv()), |
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a0(model->get_nc_total()), |
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da0_dx(model->get_nc_total(), model->get_state()->get_ndx()), |
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dv(model->get_state()->get_nv()), |
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ddv_dx(model->get_state()->get_nv(), model->get_state()->get_ndx()), |
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fext(model->get_state()->get_pinocchio()->njoints, |
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✓✗✓✗ ✓✗✓✗ ✓✗✓✗ ✓✗ |
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pinocchio::ForceTpl<Scalar>::Zero()) { |
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✓✗ |
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Jc.setZero(); |
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✓✗ |
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a0.setZero(); |
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✓✗ |
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da0_dx.setZero(); |
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✓✗ |
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dv.setZero(); |
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✓✗ |
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ddv_dx.setZero(); |
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for (typename ContactModelMultiple::ContactModelContainer::const_iterator |
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it = model->get_contacts().begin(); |
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✓✓ |
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it != model->get_contacts().end(); ++it) { |
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const boost::shared_ptr<ContactItem>& item = it->second; |
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✓✗ |
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contacts.insert( |
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✓✗✓✗
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std::make_pair(item->name, item->contact->createData(data))); |
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} |
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} |
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MatrixXs Jc; //!< Contact Jacobian in frame coordinate |
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//!< \f$\mathbf{J}_c\in\mathbb{R}^{nc_{total}\times{nv}}\f$ |
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//!< (memory defined for active and inactive contacts) |
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VectorXs a0; //!< Desired spatial contact acceleration in frame coordinate |
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//!< \f$\underline{\mathbf{a}}_0\in\mathbb{R}^{nc_{total}}\f$ |
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//!< (memory defined for active and inactive contacts) |
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MatrixXs |
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da0_dx; //!< Jacobian of the desired spatial contact acceleration in |
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//!< frame coordinate |
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//!< \f$\frac{\partial\underline{\mathbf{a}}_0}{\partial\mathbf{x}}\in\mathbb{R}^{nc_{total}\times{ndx}}\f$ |
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//!< (memory defined for active and inactive contacts) |
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VectorXs dv; //!< Constrained system acceleration in generalized coordinates |
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//!< \f$\dot{\mathbf{v}}\in\mathbb{R}^{nv}\f$ |
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MatrixXs |
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ddv_dx; //!< Jacobian of the system acceleration in generalized |
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//!< coordinates |
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//!< \f$\frac{\partial\dot{\mathbf{v}}}{\partial\mathbf{x}}\in\mathbb{R}^{nv\times |
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//!< ndx}\f$ |
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typename ContactModelMultiple::ContactDataContainer |
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contacts; //!< Stack of contact data |
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pinocchio::container::aligned_vector<pinocchio::ForceTpl<Scalar> > |
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fext; //!< External spatial forces in body coordinates |
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}; |
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} // namespace crocoddyl |
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/* --- Details -------------------------------------------------------------- */ |
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/* --- Details -------------------------------------------------------------- */ |
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/* --- Details -------------------------------------------------------------- */ |
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#include "crocoddyl/multibody/contacts/multiple-contacts.hxx" |
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#endif // CROCODDYL_MULTIBODY_CONTACTS_MULTIPLE_CONTACTS_HPP_ |