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Maniphest T85057

Baking ambient occlusion to vertex colors produces black spots
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Description

System Information
Operating system: macOS / Windows 10
Graphics card: Intel iris / RX 580

Blender Version
Broken: 2.92 beta

Short description of error
When baking AO to vertex colors, it can produce odd black spots where there clearly shouldn't be. From inspecting the mesh, it seems fine (and render preview seems good). Moving the mesh upwards in Z and then baking seems to fix the issue, but it reappears if I move it back down and bake again.

Exact steps for others to reproduce the error
See the attached blend file. Bake AO to vertex colors and view the layer in solid mode.

rally-school-ao.blend1 MBDownload

Related Objects

Event Timeline

Tom Smalley (tomsmalley) created this task.Jan 25 2021, 9:56 PM
Tom Smalley (tomsmalley) added a project: Cycles.Jan 25 2021, 10:04 PM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).Jan 26 2021, 11:55 AM

Can confirm, but unfortunately, this is the same as T75469: AO shader artifacts.
Please have a read there regarding workarounds [that you already discovered partially], but also for the longterm solution (D6250).

Philipp Oeser (lichtwerk) closed this task as a duplicate of T75469: AO shader artifacts.Jan 26 2021, 11:55 AM
Tom Smalley (tomsmalley) mentioned this in D6250: Fix T43835, T54284: Cycles with no ray offsetting.Aug 29 2021, 11:28 AM
Jan Kadeřábek (jendabek) added a subscriber: Jan Kadeřábek (jendabek).Feb 22 2022, 10:07 PM