Denoising passes get inappropriate values with a volume in front. #51567

New Issue

tobbew · 2017-05-20T09:04:34+02:00

tobbew commented

2017-05-20 09:04:34 +02:00

If you have a volume in front of objects Denoising Depth and Normal passes gets the volumes surface not the surface behind. Interestingly enough it seems it treats it differently if you set a (completely - never tried something in between) transparent surface shader than "none" as surface. None is treated as a surface while transparent is not and gives the normal of the object behind (and a better denoising result).

If possible I think "None" should work as totally transparent. If this would not be possible I'd suggest adding a transparent surface shader as default to the "quick smoke" and writing this clearly as a known issue with a simple workaround. [If this is already clearly documentet my apoligies for not having noticed.]

I have a simple test scene which proves it, but I don't see where to add it. I tested this with buildbot build blender-2.78.0-git.6cd1d34-windows64 of today.

If you have a volume in front of objects Denoising Depth and Normal passes gets the volumes surface not the surface behind. Interestingly enough it seems it treats it differently if you set a (completely - never tried something in between) transparent surface shader than "none" as surface. None is treated as a surface while transparent is not and gives the normal of the object behind (and a better denoising result). If possible I think "None" should work as totally transparent. If this would not be possible I'd suggest adding a transparent surface shader as default to the "quick smoke" and writing this clearly as a known issue with a simple workaround. [If this is already clearly documentet my apoligies for not having noticed.] I have a simple test scene which proves it, but I don't see where to add it. I tested this with buildbot build blender-2.78.0-git.6cd1d34-windows64 of today.

tobbew commented

2017-05-20 09:04:34 +02:00

Changed status to: 'Open'

tobbew commented

2017-05-20 09:04:34 +02:00

Added subscriber: @tobbew

tobbew commented

2017-05-20 09:10:08 +02:00

tw_cycles_denoising_bug.blend This file shows the issue. (It does not matter if volumes are empty. They have the same material. Left has "None" surface, right has a transparent one.

[tw_cycles_denoising_bug.blend](https://archive.blender.org/developer/F604614/tw_cycles_denoising_bug.blend) This file shows the issue. (It does not matter if volumes are empty. They have the same material. Left has "None" surface, right has a transparent one.

Lukas Stockner was assigned by Sergey Sharybin

2017-05-20 14:18:40 +02:00

Lukas Stockner commented

2017-05-21 05:48:21 +02:00

Changed status from 'Open' to: 'Resolved'

Lukas Stockner closed this issue

2017-05-21 05:48:21 +02:00

Lukas Stockner commented

2017-05-21 05:48:21 +02:00

Fixed with 3bf69b26ef, thanks for the report.

Fixed with 3bf69b26ef, thanks for the report.

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Denoising passes get inappropriate values with a volume in front. #51567