use ambocc as a shadow pass?

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Old 12 December 2006   #1
use ambocc as a shadow pass?

the occlusion preset in MR render layers gives the perfect shadows for a scene im doing. the only problem is i need them on a separate pass for live action compositing, so i cant have my shadow receiving object (which is a stand in for a real object) self-shadow... i cant figure out how to disable this in the shader.

if its not possible, whats a good way to get the same look as that shader for the shadows?
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Old 12 December 2006   #2
Why not just render out a quick matte to mask out your stand in object. You can then remove the self-shadowing in comp?

Otherwise, check out ctrl-occlusion it may have an option to remove self-occlusion.

edit: sorry, re-read your question, the first idea wouldn't work....

Last edited by CiaranM : 12 December 2006 at 09:04 PM.
 
Old 12 December 2006   #3
haha thats what i'm doing

but it requires manuall rotoscoping that i'd like to avoid as i still have 15 shots to go
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Old 12 December 2006   #4
I haven't played with it much, but I believe you can do this with ctrl.occlusion. Somehow you specify occlusion groups, that dont occlude themselves, only others. I may be wrong here, but you might want to look into this possibility.

edit: I read up on ctrl.occlusion. I dont think its quite right for your needs.

However after re-reading your posts I thought maybe you could just use the mib_ambient_occlusion, but not as a layer over-ride. Selectively assign it to your receiving objects, then assign a white surface shader to your casting objects. I think this would work.
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Last edited by djx : 12 December 2006 at 11:50 AM.
 
Old 12 December 2006   #5
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