Help with Material Layers and Alpha Channels

[LeoCortes]

[cross-posting]

Hello Gents,

I have a model with a basic material and four more layers driven by individual alpha channels to reveal those four other materials in different areas of the same object.
Now I am creating separate rendering passes and I need to isolate each of these five materials. The base material was easily isolated through an override but I am not sure on how to proceed in order to isolate the layered materials. Any suggestion appreciated.

Leo

[Hirazi Blue]

What version of SI are you using?
There was a bug fixed in 2011 SP1 that might sound familiar:

UDEV00254446 Material overrides only works with the first layer