I made some assets for CryEngine a while back, and was able to manipulate normal maps and environment maps to create a decently-realistic curtain wall material (buildings closest to camera):
I'd like to be able to replicate this in Skylines, but so far I've been forced to use the default environment map and default building shader, which ignores the underlying normal map and gives me a flat, planar reflection:
which isn't nearly as good.
Is there a way to do a custom material? Furthermore, is there a way to use multiple materials on one building? It'd be much more useful to have a tilable curtain wall texture and then a separate sheet for the details rather than... well I don't even know how I'd do it differently.

I'd like to be able to replicate this in Skylines, but so far I've been forced to use the default environment map and default building shader, which ignores the underlying normal map and gives me a flat, planar reflection:

which isn't nearly as good.
Is there a way to do a custom material? Furthermore, is there a way to use multiple materials on one building? It'd be much more useful to have a tilable curtain wall texture and then a separate sheet for the details rather than... well I don't even know how I'd do it differently.