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Keep Alpha of Opaque Objects


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Hello guys!

 

I have come up with a problem where I want to render out some geometry that is totally opaque but want to keep it's alpha information on the alpha channel. I tried pluggin a constant value of 1 on the Surface Alpha value of the output node but the opacity overrides that and throws no alpha info.

 

So in short, what I need is to make the geo invisible on the beauty but keep its info on the alpha channel.

 

Thanks a lot!!!

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