libmsh

This is a basic C library to manage gmsh meshes. It can load .msh files and extract physical surfaces.

msh2pgf

The msh2pgf tool allows conversion from the msh format to data files that can be rendered with pgf. It first extract the list of physical surfaces from the msh file, and then export the coordinates of the vertices of these surfaces to a .vrt file. The triangles of the physical surfaces are exported in a .idx file with the appropriate vertex numbering.

The .vrt and .idx files can be used in pgf like this:

\begin{axis}
	\addplot3[patch, patch table with point meta={my_mesh.msh.idx}] 
		file {my_mesh.msh.vrt};
\end{axis}

See data/render.tex for an example.