Cycles transparency shader #62692
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Reference: blender/blender#62692
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System Information
Operating system: Ubuntu 18.04 64bit
Graphics card: AMD RX 580 8GB
Blender Version
Broken: 2.80.49,
cc5bdf0293, 2019-03-16Short description of error
As you can see the same project is opened in both Blender 2.79 (left) and Blender 2.8 (right).
The results are different, the one in 2.8 has some weird dark edges. Here i am using transparency mixed with other shaders.
Here is the blend file
Clouds.blend
Added subscriber: @nacioss
Added subscriber: @StephenSwaney
Is this related to #62691 Default Clamp value ?
Nope, Clamp is set to 0.
If i put a plane with transparent shader in front of the clouds they render without dark edges
Added subscriber: @zeauro
If Roughness of Refraction shader is ignored, set to zero or use a Sharp Distribution, problem does not exist.
It does not look like a bug. It just looks like Cycles gives a result more respectful of roughness after a fix.
Probably, this fix.
7613ffcYour solution to set the roughness to 0 partially solves the issue, in the image i just skipped the Refraction BSDF, but unfortunately there are still some dark bands in the cycles render
90d4b823d7seems to have had an effect on this, but that probably means the issue in some other sampling code.This is what i have to achieve: a glowing effect for the sun rays passing through the clouds.
If there are other ways you know to achieve it, please tell me.
Added subscriber: @brecht
Added subscriber: @Blendify
Changed status from 'Confirmed' to: 'Needs User Info'
Hi can you test with blender 2.83 to see if the issue is still relevant https://builder.blender.org/download/
Changed status from 'Needs User Info' to: 'Resolved'
No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.
Thanks again for the report. If the problem persists please open a new report with the required information.