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Maniphest T42443

Baking AO in BI fails with wire material
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Description

System Information
Archlinux
GTX 460

Blender Version
Broken: beaed66, 2.72b

Short description of error
Baking AO gives a lot of z fighting and strange artifacts when a wire material is present.
See http://blender.stackexchange.com/q/18156/599

Exact steps for others to reproduce the error

  1. Open
    AO_wire_material.blend565 KBDownload
    and press bake. Bake has a lot of artifacts.
  2. Delete the wire material and try again. Bakes normally.

Related Objects

Event Timeline

Kitt Zwovic (gandalf3) created this task.Oct 30 2014, 8:39 AM
Kitt Zwovic (gandalf3) raised the priority of this task from to 90.
Kitt Zwovic (gandalf3) updated the task description. (Show Details)
Kitt Zwovic (gandalf3) added projects: BF Blender, Render Pipeline.
Kitt Zwovic (gandalf3) edited a custom field.
Kitt Zwovic (gandalf3) added a subscriber: Kitt Zwovic (gandalf3).
Jasper van Nieuwenhuizen (jasperge) added a subscriber: Jasper van Nieuwenhuizen (jasperge).Oct 30 2014, 4:34 PM

Confirmed this on OS X 10.8.5.
Though I'm wondering if this is really a bug or expected behavior. If you put the normal material on top and the wire material below (I know, this doesn't make any sense) the problem is gone. So it seems like the wire material is 'in the way' of the occlusion rendering so to speak.

Kitt Zwovic (gandalf3) added a comment.Oct 30 2014, 6:30 PM

That's probably what is happening, which would explain why it looks like Z-fighting.
I would have expected the wire material to be ignored completely though, since only AO was being baked (which AFAIK usually ignores materials).

That said, it's a pretty minor bug in that it has an easy workaround..

Jasper van Nieuwenhuizen (jasperge) added a comment.Oct 30 2014, 7:17 PM

"...which AFAIK ususally ignores materials..." reminded me of something. Actually it doesn't ignore materials, so it can take the bump/displacement map into account for example. If you do not want this, there is an option you can tick: Normalized Just tried it and this fixes your problem.

Bastien Montagne (mont29) changed the task status from Unknown Status to Unknown Status.Oct 31 2014, 10:02 AM
Bastien Montagne (mont29) claimed this task.

Eeeeh, then, think we can archive this one, right? Thanks for the report, anyway.