There is a ton of potential with the Material Merge (UV) option for game dev. It can potentially save a lot of draw calls on a character. The problem is that there is no way to change what might need to be higher resolution.
A good example is with hair. If I want to combine a beard, mustache, and hair all into one then my hair becomes insanely low resolution. Usually because the scalp texture takes up a huge part of the UV space and every other hair UV gets its own space. This is very inefficient.
What I would like to suggest is expanding this tool to allow for a few things:
- Choose priority per material selected to let some objects be lower res while others may be higher. - Add an option to stack similar UVs. This would be very useful for things like hair and fingernails.