LEMONS: An open-source platform to generate non-circuLar, anthropometry-based pEdestrian shapes and simulate their Mechanical interactiONS in two dimensions, by Oscar Dufour, Maxime Stapelle, Alexandre Nicolas

SciPost Physics Codebases Home Authoring Refereeing Submit a manuscript About LEMONS: An open-source platform to generate non-circuLar, anthropometry-based pEdestrian shapes and simulate their Mechanical interactiONS in two dimensions Oscar Dufour, Maxime Stapelle, Alexandre Nicolas SciPost Phys. Codebases 67 (2026) · published 25 March 2026 doi: 10.21468/SciPostPhysCodeb.67 pdf live repo (external) BiBTeX RIS Submissions/Reports This Publication is part of a bundle When citing, cite all relevant items (e.g. for a Codebase, cite both the article and the release you used). DOI Type Published on 10.21468/SciPostPhysCodeb.67 Article 2026-03-25 10.21468/SciPostPhysCodeb.67-r1.0 Codebase release 2026-03-25 Abstract To model dense crowds, the usual recourse to oversimplified (circular) pedestrian shapes and contact forces shows limitations. To help modellers overcome these limitations, we propose an open-source numerical tool. It consists of a Python library that generates 2D and 3D pedestrian crowds based on anthropometric data, and a C++ library that computes mechanical contacts with other agents and with obstacles, and evolves the crowd's configuration. Additionally, we provide an online platform with a user-friendly graphical interface for the Python library, and scripts to call the C++ library from Python. The tool enables users to implement their own decisional layer, i.e., to control the agents' choices of desired velocities. × TY - JOURPB - SciPost FoundationDO - 10.21468/SciPostPhysCodeb.67TI - LEMONS: An open-source platform to generate non-circuLar, anthropometry-based pEdestrian shapes and simulate their Mechanical interactiONS in two dimensionsPY - 2026/03/25UR - https://scipost.org/SciPostPhysCodeb.67JF - SciPost Physics CodebasesJA - SciPost Phys. CodebasesSP - 67A1 - Dufour, OscarAU - Stapelle, MaximeAU - Nicolas, AlexandreAB - To model dense crowds, the usual recourse to oversimplified (circular) pedestrian shapes and contact forces shows limitations. To help modellers overcome these limitations, we propose an open-source numerical tool. It consists of a Python library that generates 2D and 3D pedestrian crowds based on anthropometric data, and a C++ library that computes mechanical contacts with other agents and with obstacles, and evolves the crowd's configuration. Additionally, we provide an online platform with a user-friendly graphical interface for the Python library, and scripts to call the C++ library from Python. The tool enables users to implement their own decisional layer, i.e., to control the agents' choices of desired velocities.ER - × @Article{10.21468/SciPostPhysCodeb.67, title={{LEMONS: An open-source platform to generate non-circuLar, anthropometry-based pEdestrian shapes and simulate their Mechanical interactiONS in two dimensions}}, author={Oscar Dufour and Maxime Stapelle and Alexandre Nicolas}, journal={SciPost Phys. Codebases}, pages={67}, year={2026}, publisher={SciPost}, doi={10.21468/SciPostPhysCodeb.67}, url={https://scipost.org/10.21468/SciPostPhysCodeb.67},}@Article{10.21468/SciPostPhysCodeb.67-r1.0, title={{Codebase release 1.0 for LEMONS}}, author={Oscar Dufour and Maxime Stapelle and Alexandre Nicolas}, journal={SciPost Phys. Codebases}, pages={67-r1.0}, year={2026}, publisher={SciPost}, doi={10.21468/SciPostPhysCodeb.67-r1.0}, url={https://scipost.org/10.21468/SciPostPhysCodeb.67-r1.0},} Supplementary Information External links to supplemental resources; opens in a new tab. Data repository Authors / Affiliations: mappings to Contributors and Organizations See all Organizations. 1 2 Oscar Dufour, 1 2 Maxime Stapelle, 1 2 Alexandre Nicolas 1 Claude Bernard University Lyon 1 [UCBL] 2 Institut Lumière Matière / Institut Lumière Matière [ILM] Funders for the research work leading to this publication Agence Nationale de la Recherche [ANR] Centre National de la Recherche Scientifique / French National Centre for Scientific Research [CNRS] Deutsche Forschungsgemeinschaft / German Research FoundationDeutsche Forschungsgemeinschaft [DFG]