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MeshLib
MeshLib is a cross-platform software development kit (SDK) for three-dimensional (3D) data processing, primarily implemented in C++. It provides tools for handling polygonal meshes, point clouds, and voxel-based data. The library includes functionality for geometry processing, computational analysis, and conversion between different 3D data formats. Bindings are available for Python (fully exposed starting from version 3.0.0.) and C# (not fully exposed), with a C API fully exposed since v3.0.7.