I have a multitexture shader (fairly unoptimized) that I might be able to release with a small explaination, its pretty easy. basically skin1 represents the map, so anywhere you paint blue is going to be rock (or whatever you set that skin for) red- dirt (again can really be anything and green- usually grass.

I have to find it first tho, i know its floating around my hdd somewere.


EDIT; Also almost forgot, the skin1 alpha channel represents the shadow map.