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Old 06-20-2013, 05:26 PM   #1
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Bryan Martinez
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Reflection Alpha passes

Greetings CG Society,

I have a quick question, at the moment I am working on a project with VRay and Nuke attempting to figure out how to change colors and redo lighting in post. Those steps are easy and I have successfully gotten all the appropriate passes working, however I can't seem to render out an alpha for reflections. As an example I have rendered a red reflective sphere with some GI lighting, getting some nice bounce light on the floor and all the fine detail needed. In nuke I used the alpha and some other passes to change the sphere to a nice blue color, kinda basic previs type work. Unfortunately the reflection on the ground stayed red. I have followed a couple different tutorials and scoured every check box in VRay to see if i could find a solution. No such luck. The best tutorial I found was for an older version of Max ( but its exactly what we need to do. I hope that someone here on CG has a solution for me :/.

Maya 2013
VRay 2.0 for Maya
Nuke v7.08
Old 06-27-2013, 11:32 PM   #2
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Deke Kincaid
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You don't really need an alpha for a reflection. All you have to do is plus it onto the other passes.
Old 06-28-2013, 06:15 AM   #3
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Bryan Martinez
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Adding the reflections isn't an issue, it's gaining the unique control to change the color of everything together.
Old 06-28-2013, 06:15 AM   #4
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