[python]Exporting 3dm with materials and documents specs

Hi,

I'm searching for a way to export (in python) a GH object straightly in a 3DM file with a material.

For now I'm able to export any geometry with the (rh.FileIO.File3dm).Objects.(Add each things) way, but I don't figure how to export other things (materials) linked to the objects (or if it's automatically exported with the object), nor how to export or specify tolerance or any document specifications yet.

I saw I could use rhino.doc library for somes specs but I don't know how to link it with the file3dm export.

Thanks for tips,

Shimegi