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Maniphest T91854

[Bug] Emission strength ignored alpha in Cycles
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Description

System Information
Operating system: MacOs Catalina
Graphics card: Intel Iris Graphics 6100

Blender Version
3.0.0 alpha

Short description of error
Emission strength option ignored alpha channel, and creates an opaque color on top of alpha channel.

Exact steps for others to reproduce the error
1 - Add plane mesh
2 - Add material with alpha channel (in Principled BSDF for example)
3 - Set Emission strength to 30.0 and Emission color is white.
4 - Render this with Cycles

Event Timeline

James Baxter (Pegacy) created this task.Sep 30 2021, 6:38 PM
James Baxter (Pegacy) added a comment.Sep 30 2021, 6:56 PM

2.1 And I use "invert" node for alpha texture

James Baxter (Pegacy) added a project: BF Blender (3.0).Sep 30 2021, 8:07 PM
Brecht Van Lommel (brecht) changed the task status from Needs Triage to Needs Information from User.Sep 30 2021, 8:18 PM
Brecht Van Lommel (brecht) added a subscriber: Brecht Van Lommel (brecht).

Bug reports require an example .blend file to reproduce the problem.

Brecht Van Lommel (brecht) added a comment.Sep 30 2021, 8:22 PM

The example image looks like it has image compression artifacts, which can be revealed if you boost the emission strength this much. It may be that some areas of the image have alpha that is almost but not exactly zero, which you'd only really notice with high emission strength.

Bastien Montagne (mont29) edited projects, added BF Blender, Render & Cycles; removed BF Blender (3.0).Oct 7 2021, 10:30 AM
Raimund Klink (Raimund58) closed this task as Archived.Nov 4 2021, 11:55 AM
Raimund Klink (Raimund58) added a subscriber: Raimund Klink (Raimund58).

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.