Export mesh in .msh fileformat

[Walshaikhli]

First, thank you for maintaining Trimesh, I have used it for a day so far and it's an amazing tool! I wish i knew it existed a year ago!

I was wondering if I can export .msh files directly from Trimesh, this is the GMSH program format, and it's used in the state of the art EM solvers such as SCUFF-EM. I can use GMSH to convert to .msh but I'm hoping to use Trimesh for it.

Here is what I'm doing:
trimesh.io.export.export_mesh(mesh,'outputFile', file_type="msh")

Here is the error I get:

ValueError Traceback (most recent call last)
in ()
----> 1 trimesh.io.export.export_mesh(mesh,'outputFile', file_type="msh")

~\Anaconda3\lib\site-packages\trimesh\io\export.py in export_mesh(mesh, file_obj, file_type, **kwargs)
39
40 if not (file_type in _mesh_exporters):
---> 41 raise ValueError('%s exporter not available!', file_type)
42
43 log.debug('Exporting %d faces as %s', len(mesh.faces), file_type.upper())

ValueError: ('%s exporter not available!', 'msh')

[mikedh]

Hey, glad you're liking it!

Currently msh doesn't have any importers/exporters in trimesh. On the upside, the format is very well specified and looks pretty easy to implement. If I get a chance I'll take a look at doing it, but if you're feeling energetic and want to PR here's the punch list for supporting it:

• add a <200kB test model of ASCII MSH in /models/
• add a <200kB test model of Binary MSH in /models
• add Binary/ASCII importer and Binary exporter to /trimesh/io/msh.py (either ply.py or stl.py might be good templates) that uses np.fromstring / np.frombuffer for key calls to avoid being mega slow. It might have to reject input meshes with elements other than triangles or quads.
• Add unit tests to test_export.py, and also possibly check the validity of our exports using a subprocess call to gmsh

[mikedh]

Added to enhancements list. Thanks for the report!

[selvakarna]

Hi mikedh ,
I have Error while Create STL from X Y Z co-ordinates using Trimesh.

Can you share sample code for STL Creation , from X Y Z coordinates, [Faces and vertices from Trimesh]?