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Alpha when exporting from AE

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russell birkettAlpha when exporting from AE
by on Apr 10, 2015 at 4:57:54 pm

Hi all
I'm sure this has to be an easy fix.
I have a 3d object (ray traced renderer) with 80% transparency that looks just as I want it, ie transparent. When I remove the background colour (or footage) behind it, it appears to lose its transparency. On the trial renders I've done so far, it renders with a transparent background (which is good), but the alpha information held within the object itself is ignored and it just outputs as an opaque object.
Any help greatly appreciated
Russ


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russell birkettRe: Alpha when exporting from AE
by on Apr 10, 2015 at 5:32:38 pm

I think it has something to do with the transparency settings in the material options. This gives me the look i require but doesn't export it appears.


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Dave LaRondeRe: Alpha when exporting from AE
by on Apr 10, 2015 at 9:20:00 pm

It probably has more to do with not rendering to a codec that supports alpha channels. Are you using one?

Output Module:
Quicktime Movie
PNG, Animation or ProRes 4444 codecs
Millions of Colors +
RGB + Alpha
Straight

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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russell birkettRe: Alpha when exporting from AE
by on Apr 11, 2015 at 7:36:17 am

Hi Dave
Thanks for your reply. Yep, that's exactly how I'm outputting.
'Opacity' changes are working fine, it's just the 'Transparency' under material options is only effective when it has a shape layer or footage (ie something other than transparency) behind it. As the ray-traced renderer doesn't support 'underlying transparency' I wondered if this could be the reason?
Best regards
Russ


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Dave LaRondeRe: Alpha when exporting from AE
by on Apr 11, 2015 at 9:11:30 pm

Correct. Anything else would have to be done in the next application to use the animation.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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russell birkettRe: Alpha when exporting from AE
by on Apr 11, 2015 at 9:27:54 pm

OK, Thanks Dave


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