Pinocchio instantiates the state-of-the-art Rigid Body Algorithms for poly-articulated systems based on revisited Roy Featherstone's algorithms. Besides, Pinocchio provides the analytical derivatives of the main Rigid-Body Algorithms, such as the Recursive Newton-Euler Algorithm or the Articulated-Body Algorithm.

Pinocchio was first tailored for robotics applications, but it can be used in other contexts (biomechanics, computer graphics, vision, etc.). It is built upon Eigen for linear algebra and FCL for collision detection. Pinocchio comes with a Python interface for fast code prototyping, directly accessible through Conda.

Pinocchio is now at the heart of various robotics software as Crocoddyl, an open-source and efficient Differential Dynamic Programming solver for robotics, the Stack-of-Tasks, an open-source and versatile hierarchical controller framework or the Humanoid Path Planner, open-source software for Motion and Manipulation Planning.

If you want to learn more about Pinocchio internal behaviors and main features, we invite you to read the related paper and the online documentation.

If you want to dive into Pinocchio directly, only one single line is sufficient (assuming you have Conda):

conda install pinocchio -c conda-forge

or via pip (currently only available on Linux):

pip install pin

Table of contents

• Table of contents
• Introducing Pinocchio 3
• Pinocchio main features
• Documentation
• Examples
• Tutorials
• Pinocchio continuous integrations
• Performances
• Ongoing developments
• Installation
  • ROS
• Visualization
• Citing Pinocchio
• Questions and Issues
• Credits
• Open-source projects relying on Pinocchio
• Acknowledgments

Introducing Pinocchio 3

Pinocchio3 is the latest major release of Pinocchio. It comes with multiple new features, such as:

• Sparse constrained dynamics and its analytical derivatives
• Full support of closed-loop mechanisms
• State-of-the-art frictional contact solvers
• Low-complexity constrained articulated body algorithms
• Full support of multiple-precision floating-point (MPFR) in Python and C++
• Full CasADi support in Python and C++
• Increased support of CppAD and CppADCodeGen
• New SDF and MJCF parsers
• and much more.

Pinocchio main features

Pinocchio is fast:

• C++ template library,
• cache friendly,
• automatic code generation support is available via CppADCodeGen.

Pinocchio is versatile, implementing basic and more advanced rigid body dynamics algorithms:

• forward kinematics and its analytical derivatives,
• forward/inverse dynamics and their analytical derivatives,
• centroidal dynamics and its analytical derivatives,
• support multiple precision arithmetic via Boost.Multiprecision or any similar framework,
• computations of kinematic and dynamic regressors for system identification and more,
• and much more with the support of modern and open-source Automatic Differentiation frameworks like CppAD or CasADi.

Pinocchio is flexible:

• header only,
• C++ 98/03/11/14/17/20 compliant.

Pinocchio is extensible. Pinocchio is multi-thread friendly. Pinocchio is reliable and extensively tested (unit-tests, simulations, and real-world robotics applications). Pinocchio is supported and tested on Windows, Mac OS X, Unix, and Linux (see build status here).

Documentation

The online Pinocchio documentation of the last release is available here. A cheat sheet pdf with the main functions and algorithms can be found here.

Examples

In the examples directory, we provide some basic examples of using Pinocchio in Python. Additional examples introducing Pinocchio are also available in the documentation.

Tutorials

Pinocchio comes with a large bunch of tutorials aiming at introducing the basic tools for robot control. Tutorial and training documents are listed here. You can also consider the interactive Jupyter notebook set of tutorials developed by Nicolas Mansard and Yann de Mont-Marin.

Pinocchio continuous integrations

Pinocchio is constantly tested for several platforms and distributions, as reported below:

CI on ROS
CI on Linux via APT
CI on OSX via Conda
CI on Windows via Conda
CI on Linux via Robotpkg

Performances

Pinocchio exploits, at best, the sparsity induced by the kinematic tree of robotics systems. Thanks to modern programming language paradigms, Pinocchio can unroll most of the computations directly at compile time, allowing to achieve impressive performances for a large range of robots, as illustrated by the plot below, obtained on a standard laptop equipped with an Intel Core i7 CPU @ 2.4 GHz.

For other benchmarks, and mainly the capacity of Pinocchio to exploit, at best, your CPU capacities using advanced code generation techniques, we refer to the technical paper. In addition, the introspection may also help you to understand and compare the performances of the modern rigid body dynamics libraries.

Ongoing developments

If you want to follow the current developments, you can directly refer to the devel branch. The master branch only contains the latest release. Any new Pull Request should then be submitted on the devel branch.

Installation

Pinocchio can be easily installed on various Linux (Ubuntu, Fedora, etc.) and Unix distributions (Mac OS X, BSD, etc.). Please refer to the installation procedure.

Conda

You simply need this simple line:

conda install pinocchio -c conda-forge

ROS

Pinocchio is also deployed on ROS. You may follow its deployment status below.

If you're interested in using Pinocchio on systems and/or with packages that integrate with the ROS ecosystem, we recommend the installation of Pinocchio via the binaries distributed via the ROS PPA. Here, you can install Pinocchio using:

sudo apt install ros-$ROS_DISTRO-pinocchio

This installs Pinocchio with HPP-FCL support and with Python bindings. You can then use Pinocchio in your ROS packages by:

• Depending on Pinocchio in your package.xml config (<depend>pinocchio</depend>)
• Including Pinocchio via CMake (find_package(pinocchio REQUIRED)) and linking against Pinocchio (target_link_libraries(my_library pinocchio::pinocchio))

We include support and hooks to discover the package for both ROS 1 and ROS 2. Examples can be found at the following repositories:

• ROS 1 example
• ROS 2 example

Please note that we always advise including the pinocchio/fwd.hpp header as the first include to avoid compilation errors from differing Boost-variant sizes.

ROS 1			ROS 2
Melodic			Foxy
Noetic			Galactic
			Humble
			Rolling

Visualization

Pinocchio provides support for many open-source and free visualizers:

• Gepetto Viewer: a C++ viewer based on OpenSceneGraph with Python bindings and Blender export. See here for a C++ example on mixing Pinocchio and Gepetto Viewer.
• Meshcat: supporting visualization in Python and which can be embedded inside any browser.
• Panda3d: supporting visualization in Python and which can be embedded inside any browser.
• RViz: supporting visualization in Python and which can interact with other ROS packages.

Many external viewers can also be integrated. For more information, see the example here.

Citing Pinocchio

To cite Pinocchio in your academic research, please consider citing the software paper and use the following BibTeX entry:

@inproceedings{carpentier2019pinocchio,
   title={The Pinocchio C++ library -- A fast and flexible implementation of rigid body dynamics algorithms and their analytical derivatives},
   author={Carpentier, Justin and Saurel, Guilhem and Buondonno, Gabriele and Mirabel, Joseph and Lamiraux, Florent and Stasse, Olivier and Mansard, Nicolas},
   booktitle={IEEE International Symposium on System Integrations (SII)},
   year={2019}
}

And the following one for the link to the GitHub codebase:

@misc{pinocchioweb,
   author = {Justin Carpentier and Florian Valenza and Nicolas Mansard and others},
   title = {Pinocchio: fast forward and inverse dynamics for poly-articulated systems},
   howpublished = {https://stack-of-tasks.github.io/pinocchio},
   year = {2015--2021}
}

Citing specific algorithmic contributions

Pinocchio goes beyond implementing the standard rigid-body dynamics algorithms and results from active research on simulation, learning and control. Pinocchio provides state-of-the-art algorithms for handling constraints, differentiating forward and inverse dynamics, etc. If you use these algorithms, please consider citing them in your research articles.

• Le Lidec, Q., Montaut, L. & Carpentier, J. (2024, July). From Compliant to Rigid Contact Simulation: a Unified and Efficient Approach. In RSS 2024-Robotics: Science and Systems.
• Montaut, L., Le Lidec, Q., Petrik, V., Sivic, J., & Carpentier, J. (2024). GJK++: Leveraging Acceleration Methods for Faster Collision Detection. IEEE Transactions on Robotics.
• Sathya, A., & Carpentier, J. (2024). Constrained Articulated Body Dynamics Algorithms. Under review.
• Montaut, L., Le Lidec, Q., Bambade, A., Petrik, V., Sivic, J., & Carpentier, J. (2023, May). Differentiable collision detection: a randomized smoothing approach. In 2023 IEEE International Conference on Robotics and Automation (ICRA).
• Le Lidec, Q., Jallet, W., Montaut, L., Laptev, I., Schmid, C., & Carpentier, J. (2023). Contact models in robotics: a comparative analysis. Under review.
• Montaut, L., Le Lidec, Q., Petrik, V., Sivic, J., & Carpentier, J. (2022, June). Collision Detection Accelerated: An Optimization Perspective. In Robotics: Science and Systems (RSS 2O22).
• Carpentier, J., Budhiraja, R., & Mansard, N. (2021, July). Proximal and sparse resolution of constrained dynamic equations. In Robotics: Science and Systems (RSS 2021).
• Carpentier, J., & Mansard, N. (2018, June). Analytical derivatives of rigid body dynamics algorithms. In Robotics: Science and systems (RSS 2018).

Questions and Issues

Do you have a question or an issue? You may either directly open a new question or a new issue or, directly contact us via the mailing list pinocchio@inria.fr.

Credits

The following people have been involved in the development of Pinocchio and are warmly thanked for their contributions:

• Justin Carpentier (Inria): main developer and manager of the project
• Nicolas Mansard (LAAS-CNRS): initial project instructor
• Guilhem Saurel (LAAS-CNRS): continuous integration and deployment
• Joseph Mirabel (Eureka Robotics): Lie groups and hpp-fcl implementation
• Antonio El Khoury (Wandercraft): bug fixes
• Gabriele Buondono (LAAS-CNRS): features extension, bug fixes, and Python bindings
• Florian Valenza (Astek): core developments and hpp-fcl support
• Wolfgang Merkt (University of Oxford): ROS integration and support
• Rohan Budhiraja (LAAS-CNRS): features extension
• Loïc Estève (Inria): Conda integration and support
• Igor Kalevatykh (Inria): Panda3d viewer support
• Matthieu Vigne (Wandercraft): MeshCat viewer support
• Robin Strudel (Inria): features extension
• François Keith (CEA): Windows support
• Sarah El Kazdadi (Inria): multi-precision arithmetic support
• Nicolas Torres Alberto (Inria): features extension
• Etienne Arlaud (Inria): RViz viewer support
• Wilson Jallet (LAAS-CNRS/Inria): extension of Python bindings
• Fabian Schramm (Inria): core developper
• Shubham Singh (UT Austin): second-order inverse dynamics derivatives
• Stéphane Caron (Inria): core developper
• Joris Vaillant (Inria): core developer and manager of the project
• Sebastian Castro (The AI Institute): MeshCat viewer feature extension
• Lev Kozlov: Kinetic and potential energy regressors
• Megane Millan (Inria): Features extension and core developer
• Simeon Nedelchev: Pseudo inertia and Log-cholesky parametrization

If you have participated in the development of Pinocchio, please add your name and contribution to this list.

Open-source projects relying on Pinocchio

• Crocoddyl: A software to realize model predictive control for complex robotics platforms.
• TSID: A software that implements a Task Space Inverse Dynamics QP.
• HPP: A SDK that implements motion planners for humanoids and other robots.
• Jiminy: A simulator based on Pinocchio.
• ocs2: A toolbox for Optimal Control for Switched Systems (OCS2)
• TriFingerSimulation: TriFinger Robot Simulation (a Robot to perform RL on manipulation).
• Casadi_Kin_Dyn: IIT Package for generation of symbolic (SX) expressions of robot kinematics and dynamics.
• PyRoboPlan: An educational Python library for manipulator motion planning using the Pinocchio Python bindings.
• ProxSuite-NLP: A primal-dual augmented Lagrangian solver for nonlinear programming on manifolds.
• Aligator: A versatile and efficient framework for constrained trajectory optimization.
• Simple: The Simple Simulator: Simulation Made Simple.
• LoIK: Low-Complexity Inverse Kinematics.

Acknowledgments

The development of Pinocchio is actively supported by the Gepetto team @LAAS-CNRS and the Willow team @INRIA.