alpha matte problem

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alpha matte problem

Postby foliohattu » Tue Jul 16, 2024 12:00 pm

foliohattu Tue Jul 16, 2024 12:00 pm
Hi im doing a project and they send me a pine model.
Some of the pine needles render as this blurry alpha border.
is there a way to fix it in octane settings?
chocking the matte out will eat out small branches and detail too
attached a picture of the problem
Attachments
pine_problem.png
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Re: alpha matte problem

Postby skientia » Tue Jul 16, 2024 12:07 pm

skientia Tue Jul 16, 2024 12:07 pm
1. Is Keep Environment enabled?
2. If not (ideally), proper "alpha" (associated via EXR not PNG, or at least TIFF) will yield expected results.
3. Worth double-checking if, in the kernel settings, Alpha Shadow is enabled (default).
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Re: alpha matte problem

Postby foliohattu » Tue Jul 16, 2024 8:54 pm

foliohattu Tue Jul 16, 2024 8:54 pm
skientia wrote:1. Is Keep Environment enabled?
2. If not (ideally), proper "alpha" (associated via EXR not PNG, or at least TIFF) will yield expected results.
3. Worth double-checking if, in the kernel settings, Alpha Shadow is enabled (default).


Hey Thanks million.
It was the keep enviroment. why does it do that to alpha if its left on?

I'll attatch a picture if some one is searching for this problem. Tree on the left is keep enviroment off and right one is on.
Attachments
alphaprob.jpg
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Re: alpha matte problem

Postby skientia » Wed Jul 17, 2024 4:16 pm

skientia Wed Jul 17, 2024 4:16 pm
The link in the previous message contains answer to your question, it is a forum thread of a nearly identical case.
Is there any reason to check this option in the first place?
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