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Thread Tools | Display Modes |
  ambient occlusion in Nuke |
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(#1)
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Certified User
Posts: 36
Join Date: Aug 2007
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ambient occlusion in Nuke -
March 10th, 2009, 08:05 AM
hello
sorry this might be a little strange but I don't know how to get the best result in Nuke with ambient occlusion pass.. you know in Photoshop I just multiply it .. but in Nuke, Multiplying darkens the whole image.. and I don't know how to composite the AO pass back on the footage properly.. I 'm not pro with Nuke so I need help! thank you in advance.. |
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(#2)
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Lighting & Compositing TD
Posts: 189
Join Date: Sep 2008
Location: Gävle, Sweden
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March 10th, 2009, 08:32 AM
try plus or over. edit: (I recall this statement, brain didn't have enough oxygen while answering the first time)
 multiply Lighting & Compositing TD Personal Portfolio: www.elitevfx.com Tutorial Website by Me and Hugo Guerra: www.vfxvault.com Last edited by elitevfx; March 10th, 2009 at 12:35 PM. Reason: syntax error |
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(#3)
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Professional Bum
Posts: 342
Join Date: Oct 2007
Location: Denver, Boston, Heading to LA
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March 10th, 2009, 12:06 PM
In general, an ambient occlusion pass is multiplied in. Yes, multiply darkens the image. That's the point. You multiply the ambient occlusion by ambient illumination, then add ambient to diffuse. You can grade the ambient occlusion pass to lift the blacks or whatever to make it have a lighter effect.
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(#4)
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Certified User
Posts: 36
Join Date: Mar 2007
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March 10th, 2009, 01:39 PM
definitely multiply it -
it could be darkening it because it is also multiplying the alpha channel as well? check it is only operating on the RGB channels? just a thought... |
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(#5)
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comp
Posts: 306
Join Date: Apr 2008
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March 10th, 2009, 02:20 PM
also, if it the AO isn't on white, it will darken too much of the image, so if that's the case, try merging it over a white constant and then multiply it.
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(#6)
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Certified User
Posts: 17
Join Date: Mar 2006
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March 11th, 2009, 03:04 AM
Quote:
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