Render unpremultiplied render passes with Alpha ?

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Render unpremultiplied render passes with Alpha ?

Postby fantome » Thu Mar 29, 2018 3:57 pm

fantome Thu Mar 29, 2018 3:57 pm
Hi guys,

I would have two question about render passes :
1) Is it possible to render the beauty render passes ( like emission / diffusion / reflection / refraction ) without being premultiplied by the alpha of the object , in order to get the raw pixel in the edge of the alpha to avoid black line in comp ?
2) Is it possible to ouput directly an alpha channel of the render elements in each render passes or do i have to rebuild it on comp ?

My goal is to be able to recompose an image in comp with refractive / reflective object by using only render passes.

It does work with render layer but it is longer to render i would like to know if i can get the same thing only with render passes.

Thanks for your lights
Cheers
E
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Re: Render unpremultiplied render passes with Alpha ?

Postby juanjgon » Wed Apr 04, 2018 11:02 pm

juanjgon Wed Apr 04, 2018 11:02 pm
Hi,

Have you tried the "Pre-multiplied alpha" option available in the render target "Imager" node/tab? This option should affect all the passes, as far as I know.

Thanks,
-Juanjo
Computer Graphics Software Developer
Octane plugin development and support: LightWave and Houdini
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Re: Render unpremultiplied render passes with Alpha ?

Postby fantome » Sat Apr 07, 2018 8:53 am

fantome Sat Apr 07, 2018 8:53 am
Thanks for your help Juanjo !

I have already play with this one but i will double check this option and tell you if it solve what i am searching for.

Cheers
E
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