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Surface anaLysis And Modeling


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Surface anaLysis And Modeling (Slam)

All Contributors

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Slam is an open source python package dedicated to the representation of neuroanatomical surfaces stemming from MRI data in the form of triangular meshes and to their processing and analysis. Slam is an extension of Trimesh, an open source python package dedicated to triangular meshes processing.

Main Features

Look at the doc for a complete overview of available features!

  • io: read/write gifti (and nifti) file format

  • generate_parametric_surfaces: generation of parametric surfaces with random sampling

  • geodesics: geodesic distance computation using tvb-gdist and networkx

  • differential_geometry: several implementations of graph Laplacian (conformal, authalic, FEM...), texture Gradient

  • mapping: several types of mapping between the mesh and a sphere, a disc...

  • distortion: distortion measures between two meshes, for quantitative analysis of mapping properties

  • remeshing: projection of vertex-level information between two meshes based on their spherical representation

  • topology: mesh surgery (boundary indentification, large hole closing)

  • vertex_voronoi: compute the voronoi of each vertex of a mesh, usefull for numerous applications

  • texture: a class to manage properly vertex-level information.

  • plot: extension of pyglet and visbrain viewers to visualize slam objects

For contributors

Code of conduct

The very first thing to do before contributing is to read our Code of conduct.

Have a look at the github project!

We are using a github project to organize the code development and maintenance:

If you are interested in contributing, please first have a look at it and contact us by creating a new issue.

Contributors Installation


  1. Create an account on Github if you do not already have one
  2. Sign in GitHub and fork the slam GitHub repository
  3. We highly recommend to rely on a (conda) virtual environment as provided by miniconda. See miniconda installation instructions if you do not already have one. Then create a virtual environment by typing the following lines in a terminal:
  conda create -q -n slam python=3.8
  conda activate slam

This creates an empty conda virtual environment with Python 3.8 and basic packages (e.g. pip, setuptools) and make it the default python environment.


  1. Clone your personal slam fork in your current local directory
    git clone<username>/slam
  2. Perform a full slam installation in editable mode
     pip install -e .['dev']
  3. Set upstream repository to keep your clone up-to-date
     git remote add upstream

You are now ready to modify slam code and submit a pull request


These dependencies, whether mandatory or optional, are managed automatically and transparently for the user during the installation phase and are listed here for the sake of completeness.


In order to work fine, slam requires:

  • a Python 3.8 installation

  • setuptools

  • pip

  • numpy

  • scipy

  • cython

  • trimesh

  • nibabel

Distance computation (Optional)

tvb-gdist is recommended for geodesic distance/shortest paths computations

Hall of fame

All contributions are of course much welcome! In addition to the global thank you to all contributors to this project, a special big thanks to:

. and for their precious help for setting up continuous integration tools.

. for his help regarding visualization and Visbrain (

. for his implementation of a very nice curvature estimation technique.

. for implementing the curvature decomposition and many unitests

. to be continued...

Contributors ✨

Thanks goes to these wonderful people (emoji key):


🚧 📆 🤔 💻


💻 📖 💡 🤔 ⚠️

Tianqi SONG

💻 💡 🤔

Etienne Combrisson

💻 🔧

This project follows the all-contributors specification. Contributions of any kind welcome!


Surface anaLysis And Modeling



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