tri_surface_io, a Fortran90 code which reads or writes the graphics information stored in a pair of files that represent a TRI_SURFACE object, that is, a surface in 3D formed by a connected collection of triangles.
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tri_surface_io is available in a C++ version and a Fortran90 version and a MATLAB version and an Octave version.
ply_to_tri_surface, a MATLAB code which extracts data from a PLY file and writes it to a TRI_SURFACE file.
tet_mesh_boundary, a Fortran90 code which returns the nodes and faces of the boundary of a tetrahedral mesh, which themselves form a 3D triangular mesh or "TRI_SURFACE".