When loading TetrahedronHyperElasticModel.

GMSH is doing volumetric meshing. The output mesh is composed of:

• liste de points
• liste de edges (qui relie des points) mais uniquement les edges de la surface
• liste de triangles (que les triangles de surface)
• liste de tetras

The tetrahedronhyperelasticmodel is doing the computation for the volumetric mesh.

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