At the moment I am contemplating adding character customisation to my game, however I am unsure what approaches are available when it comes to using textures/decals to add facial features (like facial hair, hairstyle, scars/blemishes etc).
The character in question is stylised with a cel shader like effect.
So what are some approaches to take? Should I be using shaders to blend textures together by having the normal diffuse texture and then a mask texture to add facial hair or are there better more efficient results to achieve what I want?
Would another possibility be to use a shader and then bake the resultant blended texture to a new diffuse texture and use that?
To clarify, the customisation will be through textures only and not through adding/changing meshes