UV Mapping

Hi leo4sims, my opinion is that if something has a truly un-bakeable UV map that you're probably better off scrapping that UV map and re-doing it yourself...it will be easier in the long run. If something just has a bit of overlap it might be quicker to fix that rather than doing a whole new UV map.

One thing to keep in mind about many Blender mapping tutorials is that they are not aimed at showing you how to create a UV map suitable for baking or detailed texturing so the methods they use will not result in a map that displays well in the game. A lot of people use Blender to render scenes rather than to make game items and tutorials showing how to map for rendering have different priorities.

If you click the a key in edit mode to select all the vertices and unwrap it you will get a new Blender unwrap. If you've marked the seams before doing this the unwrap will be according to how you've chosen to create the map.

For getting baked images any tutorial that shows how to unwrap the item so that each face that needs to be baked differently is mapped differently will work. The object mapping tutorials here are all like that because objects really need a bake map to look right in the game unless the creator is a texture artist able to hand draw all the shadowing that is needed to make the item look 3 dimensional on a flat screen. I'm sure there are others online that aren't specific to Sims 4. That said, when I was learning how to do all this myself I never ran into them in spite of looking. Most of the ones out there show how to unwrap for a fairly undetailed texture with no bake.