Hi Maxim, also another reason why MoI does not try to store render mesh data in a 3DM file is that there are various limitations on it, like no n-gons, no ability to weld vertices but have distinct UV and normals for 2 faces that share a common vertex, and no way to have multiple materials on different faces within a single solid.

Using OBJ format does not have any of these limitations, that's another reason why it's better to send mesh data to a renderer by using OBJ format rather than attempting to store render mesh data inside a 3DM file.

- Michael