That is what i'd do, but he wants to paint straight onto a texture. You could try and build, on the fly, a mesh that wraps itself round the terrain. Rather complex though and time consuming if your firing alot.
I DO notice though, that even games you pay top dollar for, have decals that stick out of the scenery, so if it's good enough for them ;o)
I DO notice though, that even games you pay top dollar for, have decals that stick out of the scenery, so if it's good enough for them ;o)