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Volume normal pass


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Hello, 

I have to do some clouds, they are lit by lightning above and inside the clouds.

So I would like to relight them in comp with nuke.

I'm rendering on arnold, (arnold volume + volume collector) but it doesn't want to build a normal and position AOV

Same for Zdepth. 

I saw this guy can do it  : 

 

 

But i don't understand how , and is it possible on arnold ??

Can someone explain me how can I do that ?

 

Thank you 

Ps : sorry for my english :(

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I believe that this is not normal pass as you would call it, but several lights with different colors. For example if you have 3 main lights in the scene you just set them as RED, GREEN and BLUE, and that's how you can control lights in post.

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