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alpha channel
Posted: Wed Apr 21, 2010 10:40 am
by SaT
Is there a way to use an alpha channel where the final render output does not contain a black background? I would like to keep the physical sky in addition to getting a seperate alpha channel.
Re: alpha channel
Posted: Sun Apr 25, 2010 7:19 pm
by SaT
No one?
Re: alpha channel
Posted: Sun Apr 25, 2010 9:01 pm
by Bubbaloo
I'm sure Tom might have an answer for you.
Re: alpha channel
Posted: Sun Apr 25, 2010 10:02 pm
by tom
The shortest way is doing the render and alpha channel first and additionally rendering the physical sky alone.
Re: alpha channel
Posted: Mon Apr 26, 2010 9:26 am
by SaT
Ok. Thanks Tom.
Re: alpha channel
Posted: Tue Apr 27, 2010 3:56 pm
by fuso
How about using the new function of embedding the alpha channel into the output image?
I haven't tried it yet so I can't say what the result is. Would be good to know though...
Just realizing how lazy that sounds but I'm in the middle of a deadline so I can't 'play around'
right now.
Re: alpha channel
Posted: Tue Apr 27, 2010 4:12 pm
by fuso
Ok I just did a quick test with the alpha channel embedded into a tif render output and nothing changed,
it's still a black background, no physical sky to be seen. Looks like you have to go with Tom's strategy.
Re: alpha channel
Posted: Thu Apr 29, 2010 10:18 am
by SaT
fuso wrote:Looks like you have to go with Tom's strategy.
You are right. Unfortunately this is an extra step.
Re: alpha channel
Posted: Thu Apr 29, 2010 5:09 pm
by fuso
Very unfortunately indeed, I'd say. One of many things I'm not happy with. Maybe this should go onto the wish list if it's not
already on there. It would be great to be able to render an image with visible skydome/HDRI and embedded alpha mask in one
step as all other render engines can...