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Maniphest T92455

Regression: Blender 3.0.0: Cycles: Hair transmission: GlossInd, TransInd passes
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Description

System Information
Linux Mint 20.2 Cinnamon - kernel 5.11.0-38
3400G

Blender Version
Broken:
From - cycles-x-blender-3.0.0-1dea1d93d39a-linux64.tar.xz
to - blender-3.0.0-alpha+master.8c21667f3ca7-linux.x86_64-release.tar.xz

Worked:
blender-2.93.5-linux-x64.tar.xz

Short description of error
For hair transmission, GlossInd is producing halos, and TransInd seems to be missing some light.

Exact steps for others to reproduce the error

Hair transmission - GlossInd, TransInd passes issue.blend135 KBDownload

  1. open the 'Hair transmission - GlossInd, TransInd passes issue.blend' and press F12
  2. close the render window
  3. in the Compositing window compare the GlossInd and TransInd passes with Blender versions 2.9.3 and 3.0.0

GlossInd - 2.9.3

GlossInd - 3.0.0

TransInd - 2.9.3

TransInd - 3.0.0

Notes:
Only seems to affect hair transmission for those 2 passes, hair reflection works as expected.

While a hair shader is normally a mix of reflection and transmission, or Principled Hair, the above .blend file was specifically created to help highlight the issue found during normal compositing of several passes for a room-set file.

Revisions and Commits

rC Cycles
rC1c3863ee246b Fix T91893, T92455: wrong transmission pass with hair and multiscatter glass
rB Blender
rBb4d9b8b7f8d6 Fix T91893, T92455: wrong transmission pass with hair and multiscatter glass

Related Objects

Event Timeline

David Black (david_black) created this task.Oct 24 2021, 10:33 PM
Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Oct 26 2021, 6:28 AM
Richard Antalik (ISS) added a project: Render & Cycles.
William Leeson (leesonw) triaged this task as High priority.Oct 29 2021, 1:36 PM
William Leeson (leesonw) added a subscriber: William Leeson (leesonw).

Was working before so I upped the priority.

Raimund Klink (Raimund58) added a subscriber: Raimund Klink (Raimund58).Oct 29 2021, 2:30 PM
Dalai Felinto (dfelinto) changed the subtype of this task from "Report" to "Bug".Nov 2 2021, 5:49 PM
Dalai Felinto (dfelinto) edited projects, added BF Blender (3.0); removed BF Blender.
Dalai Felinto (dfelinto) added a subscriber: Dalai Felinto (dfelinto).

@William Leeson (leesonw) in this case I'm also classifying it as a confirmed Bug. I'm assuming this is planned for 3.0 (I tagged it accordingly). Do you know who will tackle it? (and can we assign this to that developer)

David Black (david_black) renamed this task from Possible regression: Blender 3.0.0: Cycles: Hair transmission: GlossInd, TransInd passes to Regression: Blender 3.0.0: Cycles: Hair transmission: GlossInd, TransInd passes.Nov 7 2021, 9:31 PM
David Black (david_black) added a comment.Nov 7 2021, 9:34 PM

Thank you all for your replies,

Since now confirmed, rather than new expected behaviour/workflow, edited the subject line accordingly.

Kind regards.

Brecht Van Lommel (brecht) closed this task as Resolved by committing rBb4d9b8b7f8d6: Fix T91893, T92455: wrong transmission pass with hair and multiscatter glass.Nov 12 2021, 8:04 PM
Brecht Van Lommel (brecht) claimed this task.
Brecht Van Lommel (brecht) added a commit: rBb4d9b8b7f8d6: Fix T91893, T92455: wrong transmission pass with hair and multiscatter glass.
David Black (david_black) added a comment.Nov 25 2021, 6:00 PM

Thank you Brecht, Your commit fixing the issue is greatly appreciated.

Brecht Van Lommel (brecht) added a commit: rC1c3863ee246b: Fix T91893, T92455: wrong transmission pass with hair and multiscatter glass.Jan 27 2022, 11:31 PM