VrayDirt - Exclude vs Result Affect?

[Alex_M]

Can someone explain me the difference between the options Exclude and Result Affect in the VrayDirt texture?

Here's what the help pages say about it:

Exclude – Allows you to disable the calculation of the VRayDirt map for specific objects. Excluded object will not be shaded by the VRayDirt map.
Result Affect – Specifies a list of objects which will affect the calculation of the VRayDirt map. Excluded objects will be considered "invisible" for the calculations of the VRayDirt map.

I'm a bit confused as to what's the difference. It sounds pretty much the same to me. I also noticed that Exclude didn't work for me if I wanted to exclude objects from the effect. Only excluding them with Result Affect worked.

Thanks in advance!

[Laserschwert]

Everything in the Exclude list won't receive Dirt (and render as if the VRayDirt map wasn't assigned to it, but still generate it on non-excluded objects), while everything in the Result Affect list won't generate Dirt (although still receiving it, when not in the Exclude list as well).

[Alex_M]

Thanks, I think this makes it clear now!