Override Material for Specific channels only?

[joelly3d]

Is it possible to override just diffuse and spec of a whole scene (with exceptions required) with tons of items and materials but keep their remaining source channels for bump and opac?
That would be nifty.

[hermit.crab]

I guess the "Override mtl" options for preserving Bump and Opacity should do the trick. And also, I presume it would work through the VRayScene overrides as well, though you would have to export to .vrscene prior.

[joelly3d]

I never saw that before must be newer, thats exactly the thing i needed!