Lux Alpha mask

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Sharlybg
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Lux Alpha mask

Post by Sharlybg » Mon Feb 10, 2020 6:10 pm

I 'm rendering some stuff that require heavy compositing and extensive use of Alpha mask.
I need my background to be rendered as transparent but i've a very usefull flat plane reflector in the background.
So when the alpha is computed my flat wide background
surface is included making the alpha mask not transparent at all.

So i need a method to exclude the surface from alpha calculation.
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Dade
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Re: Lux Alpha mask

Post by Dade » Mon Feb 10, 2020 7:35 pm

You could use object ID mask AOV to get the mask of the flat plane reflector background and than post-process the alpha mask however you want :idea: Assuming you are not doing an animation :?:
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Sharlybg
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Re: Lux Alpha mask

Post by Sharlybg » Mon Feb 10, 2020 8:13 pm

Dade wrote:
Mon Feb 10, 2020 7:35 pm
You could use object ID mask AOV to get the mask of the flat plane reflector background and than post-process the alpha mask however you want :idea: Assuming you are not doing an animation :?:
Sadly this is what we are going for (animation). But i've found a simple trick by using ""Visible to camera""" flag in a separate render layer and it work ;)
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