Hi Thor, if you have welding turned on MoI does not write UVs to the .3ds file at all...

That's because .3ds does not have a proper way for 2 faces to share the same 3d point, but have different UV coordinates. .3ds has a limitation that it can only specify one single UV coordinate for each 3d point.

If you turn off welding, then UVs will be written because points are not combined into a single point along common edges.

OBJ doesn't have this limitation. In its structure, it has a way to have polygons share one single 3d point, but have different UV coordinates for each polygon.

.3ds is limited in other ways too, like it has a limitation of only having a maximum of 65535 points for a single mesh. If your program supports OBJ, I would recommend focusing on using that since it doesn't have these limitations. Only try to use .3ds if you don't have any other option.

- Michael