Ian, Yep, sure will work for bump and displacement :-) Basically it drives a blender, so you just blend your dirt bump against your clean surface bump. Layering dirt AND rust will make the shader more complex with a bunch more nodes so it will be more difficult to manipulate in the material room and will render slower, but it's certainly doable. In the longer term I'd like to put together some more complex shaders like that. I'm really just playing with my new toy at the moment.

View Ajax's Gallery - View Ajax's Freestuff - View Ajax's Store - Send Ajax a message