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Maniphest T91855

[Bug] Clipping instance geometry with alpha creates black artefacts
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Description

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

Blender Version
3.0.0 alpha

Render Engine
Cycles

Short description of error
I create sphere with hair particle, and add plane instance object with alpha. As long as instance objects are not touching each other, they work correctly. As soon as I increase the size of the object, they give black overlap. Even if I turn off shadows from object and light source.


Exact steps for others to reproduce the error
See blend file:

example.zip1 MBDownload

Event Timeline

James Baxter (Pegacy) created this task.Sep 30 2021, 7:12 PM
James Baxter (Pegacy) added a project: BF Blender (3.0).Sep 30 2021, 8:09 PM
Brecht Van Lommel (brecht) closed this task as Archived.Sep 30 2021, 8:18 PM
Brecht Van Lommel (brecht) added a subscriber: Brecht Van Lommel (brecht).

The maximum number of transparent bounces needs to be increased for this, though beware that performance impact can be significant:
https://docs.blender.org/manual/en/dev/render/cycles/render_settings/light_paths.html#max-bounces