Managed to fix this specific issue by downloading a trial version of 3DS Max.....
Exported the .OBJ using S3D
Imported the .obj into 3DS Max
Used one of the guides on here for creating ambient occlusion maps (turned out to be a red herring) ...
Used Skwasjer's tutorial for exporting additional uvw meshes ....
and imported back into S3D and when I imported it warned me that the object had vertex normals and the original didn't have them ... I said YEs to the dialogue box and when I tested, the light and dark sides were correct dependent on where the sun was ... so it was missing vertex normal which caused the issue, I think.
I now have another texture issue I'm going to start a new post about...
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