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BUZZFX
07-27-2007, 05:02 AM
RipTide/OBJ/ZBrush Mesh Problems

I created a clean geometry in C4D, then I exported an OBJ using the Default Riptide settings, then I Imported the OBJ into ZBrush, then selected the "Check UV" command and there is a hole in my mesh.

I then opened the original geometry in C4D and there was no hole, no overlapping UV's and no unaligned faces etc. The mesh is very clean. So what gives? Do your settings for RipTide look similar?

Also I noticed RipTide created 2 files, an OBJ file and a .mtl file. I imported the OBJ file into ZBrush but what's the .mtl file for? and do I need it?
Rabbitroo
07-27-2007, 02:54 PM
.mtl files are "Material" files which contain mostly material settings. If you don't need to transport materials you can *possibly* chuck it. The UV data is almost always 100% in the .obj file.

UV "holes" in the current ZB3 seem to evolve from a couple sources: ngons and overlaps. Check to make sure mesh is only quads and tris and that UVs are same. If possible, inspect your UVs in another program like Modo or UVLayout and recheck for overlaps (Modo shows them in red.)

I've "heard" that there will be some .obj fixes in ZB 3.1 (which is allegedly due in a few days) which might also ultimately pinpoint or resolve the problem.

Try unchecking: "export materials" and "export ngons" in riptide. Inspect your model in another application to see if the hole appears (it may mean you have a stray ngon.)

Last Ditch: Recast/Regenerate UVs and export.

-K
Primitiv
07-28-2007, 07:07 AM
Check if you have inverted normals in your model in C4D. They can make poles to appear hollow once imported into zBrush. Use align normals to solve this problem.
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