If you are using AO from Mental Ray: You can set a G-Buffer ID to the excluding object in its Object Properties, and then in the Mental Ray AO settings, in the Incl/Excl Object ID slot (just below Falloff) put that same number as a negative.
hey I'm wondering if there is a way to exclude a specific object from the ambient occlusion in the viewport? The main reason I ask is for my character's hair. I'd like to have AO enabled for the character as a whole, but for the hair, which uses opacity, it doesn't really work out. It pretty much reveals the outline of the…
You can't save it as a new scene (so if a disaster happens you won't lose whatever your working on) and then delete what you don't want in the AO? So in this case delete the hair. Or erase the part of the AO you don't want in PS?