headus 3D tools

SMcQ · Posts: 9 Joined: 30 Mar 2006

Has anyone figured out a way to assign materials in UVLayout for OBJ export? The only way I can do it is in my modeling app first (Carrara5) by detaching polygons and making them separate polymeshes, which really increases file size. I want to keep a single polymesh with multiple materials, and have each material fill the UV space.

Is there a way to designate shells as materials, and have each material occupy the UV square?

Thanks.

SMcQ

headus · Posted: Thu Apr 26, 2007 9:44 pm Post subject:

Can you explain a bit more what you mean by "have each material fill the UV space"?

To answer to your question though, there's currently no way to assign materials in UVLayout. It is on the list though! Someone has also asked for UVLayout to recognize incoming material groups and pre-segment the mesh based on that.

Phil

moochie · Posts: 105 Joined: 13 Jul 2006

I presume SMcQ means an auto-pack function, where each material zone is automatically allocated its own UV tile.

headus · Posted: Fri Apr 27, 2007 7:05 pm Post subject:

Oh, of course, that makes sense! I'll keep it in mind when I work on the packing tool.

Lewi · Posts: 61 Joined: 14 Jul 2006

I have always wondered about materials and obj files. Silo produces a .mtl file for materials on obj export. This doesn't appear to hold any texture co ord info. Is there some sort of grouping in the obj format for faces for areas of geom and their respective UV's ? Then the .mtl is just a guide to to the group.

headus · Posted: Sun Apr 29, 2007 5:26 pm Post subject:

Yes, basically the OBJ indicates which faces belong to which shading/material groups, and the MTL actually defines what the groups look like (eg what color each one is).

Phil