fresnel and roughness pass

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Old 09 September 2013   #1
fresnel and roughness pass

Just had a question about what operations to use when comping fresnel and roughness passes.

I was using a fresnel and roughness pass for a car I'm comping but not sure which op to use.

tried multiply, screen,over, overlay, and plus.

I'm doing this comp in nuke after rendering the car out of maxwell.
 
Old 10 October 2013   #2
This may give you some clues regarding fresnel as I've just been looking at something similar. You could....

in vray render an extratex with your reflection map plugged so just end up with a pass of your reflection map.

in your comp you can: reflection filter/extratex = Fresnel (I may have muddled which one divides but the other but you should see Fresnel).

So you can adjust that here. Or if you're literally trying to comp a Fresnel pass - maybe multiply by your raw reflection pass which gives your reflection pass.

Not sure about roughness though.
 
Old 10 October 2013   #3
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