System Intormation
Windows 8.1 | GTX680
Blender Version
Broken: 2.76.4 d970f02
Description
When exporting wavefront OBJ file, if overlapped UVs exist, the .obj file will not work as expected in many other softwares. Actually it seems the UV islands seems to be splitted into individual faces.
How to Repeat
Let's just unwrap a simple plane, then duplicate, and join them as a single mesh. Then export as .OBJ.
Firstly, which applications have issues with Blender's UV's?
I suspect this is caused by Blender sharing UV's between different vertices,
however this is allowed by the OBJ spec, so other applications should really handle this - so it becomes an issue of choosing how much to change our exporter to account for bugs/limits in other software.
This patch changes Blender's exporter not to share UV's between different vertices: P300
Could you see if this resolves the issue?
It works now. like a magic! :D
(oh and applications include Maya, 3ds Max, Unfold3D, etc)
Well… ADesk is not really renown for it love and respect of standards… That said, changes are rather simple, but it means we'll have (much) bigger .obj files when exporting UVs…