Question about UV Mapping

[chippwalters]

Hey all,

I have some questions about UV mapping. The video below sums up many of them.

What I'm really after is a way to import multiple objects as one OBJ, then separate them into separate OBJs each with their own UV Map. Is this easy to do? TIA.

 

 

[chippwalters]

I have another quick question:

 

[Carlosan]

Try exporting as .fbx file format.

[Carlosan]

After any uvseams changes you need to use unwarp tool.

[chippwalters]

Unwrap does the job! Thanks. I don't understand "export as .fbx." Do you mean export from SketchUp as fbx or export from 3D Coat as fbx?

Also, for OBJ, do the surface materials list do anything? IOW, why don't they appear from the dropdown menu for selecting a UV set?

 

[Carlosan]

Export from SketchUp as fbx, yes.

Are not listed as Paint Object ?

 

[chippwalters]

Yes, the different meshes are listed as paint objects. See this pict:

1. Paint Objects tab where they are listed

2. List of the 3 surface materials which came in with the OBJ import.

3. The dropdown list with the UV set showing only 1. Should there be 3 here (Green, Blue, Red)?

[Carlosan]

Keep this option switched off. Hope this help.

 

[chippwalters]

Thanks. It didn't work, but I think I'm just confusing the Surface Materials List with the UV set list. I don't suppose they should be the same.

What does that checkbox "Treat materials as separate textures" do? I would've thought it would create a separate UV map, but perhaps it's used for painting? Also, I still don't understand what the Surface Materials List actually does and why you would use it. Perhaps you've done a tutorial which explains it's use?

[chippwalters]

Just curious, is there any way to force a "shuffle" of the colors assigned to the 3D model in the UV room? Sometimes two colors are close to each other and I don't know if they are part of the same island group-- or sometimes the color is green and the lines are green and it's hard to make it out.

[Carlosan]

Surface Materials in 3D-Coat are the equivalent of polygonal material assignments from other programs, such as Modo or Maya. If upon import 3D-Coat detects any of these Surface Materials, they will be respected and kept, and can also be used to perform various functions in the Paint Room.

[chippwalters]

OK, thanks. Got it. Somehow the OBJ file exported from SketchUp doesn't get recognized properly. Here's a file you can test with.

geometry.obj

[Carlosan]

Cant export fbx ?

[Carlosan]

I just separate 3 meshes in external app.

Everyone have their own material

Export all as 1 obj

Import

Hope this help.

 

geometry.obj

[chippwalters]

Thanks Carlson, It appears while that works fine in Maya, it doesn't work with SketchUp. Something about their OBJ file format.

[Carlosan]

Try exporting as fbx file format

[chippwalters]

Got it. Thanks. :-)