View Full Version : Ambient Occlusion,Vray

12 December 2006, 06:40 PM
Is there a way to render an Ambient Occlusion pass with Vray and if so, how? thanks for any help

12 December 2006, 06:46 PM


12 December 2006, 06:56 PM
thank you Snipey

12 December 2006, 01:17 AM
I might be wrong, but is this plugin really necessary?

as i know ambient occlusion is white GI, without any light. and all mateials are white...

or am i wrong?

12 December 2006, 08:48 AM
The plugin just makes those things for you, its actually a maxscript. Like a render preset. However if you wish to limit the ao ray lenght then you are gonna need to use vray dirtmap.

Oh and not white GI but white skylight. It doesn't bounce light around.

12 December 2006, 02:05 AM
yea, thanks. this is what i meant. white skylight. but it's working only when GI is checked, isn't it? sorry for dumb question...but i'm not sure anymore. i have read it once, but it's some time ago :p

also nice thing to be able to controle it with the dirtmap. have to try that out :)

12 December 2006, 01:12 PM
yep, the dirtmap.

AO is a little more complicated then GI, materials all white, or skylight ETC. Here is a good read from Chris Thomas:

this uses mental ray, but the theory is the same.

VRay 1.5 has the dirt shader, which will create AO for you.


12 December 2006, 03:26 PM
You can get pretty close results if you use IR for one primary bounce and no secondary bounces. AO does not calculate "bounces".


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12 December 2006, 03:26 PM
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