Hi Pilou, for SimLab Composer I'd recommend using OBJ format and also switch the option to "Export : Quads & Triangles" instead of n-gons.
I think they only read the display mesh data out of a 3DM file rather than processing the actual NURBS surfaces in them, so their 3DM import only works on Rhino saved 3DM files and also only then if you have shaded the file inside of Rhino first so that it will generate it's display mesh data that then gets additionally stored in the 3DM file.
- Michael
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