Solid black render of object with negative scale and smooth shading #41079
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Reference: blender/blender#41079
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System Information
Windows and Linux, any CPU and GPU
Blender Version
Broken: 2.71
29e8c46
(15.6.2014) and all next compilation including 2.7150d3014
(2014.07.14)Worked:
6f1a648
(3.6.2014)Short description of error
If object is accidentally scaled by negative value in object mode, an object is shaded smooth, its renders as solid black on F12 render (cycles). But looks good in viewport render preview.
Exact steps for others to reproduce the error
in attached file
negative_scale_bug.blend
Changed status to: 'Open'
Added subscriber: @TomaszJurczyk
#41151 was marked as duplicate of this issue
Added subscriber: @BartekMoniewski
Added subscriber: @AnnaCelarek
Added subscriber: @BorekBures
I have same problem in my project, but I don't success reproduce it. Black material occurs on moving object with scale -1 deformed by armature with motion blur turned on. This bug appear on object made in old versions of Blender. If I trying reproduce it in new blender from scratch, all working fine. Work around is append object to new Blend file.
Added subscriber: @mont29
Confirmed with both the file and from scratch.
Looks like Cycles scales negatively its face normals (giving outside vnors, but inside fnors)? Odd though that flat shading works OK… :/
After all it is not a big problem, I can live without negative scaled objects. I've stumble on it by mistake.
But it could cost some time of debugging perfectly working shader. All credits to ania for help with reproducing bug.
Added subscriber: @brecht
The problem seems to be with:
I suspect it's a bug in the way scaling is applied to smooth normals (or maybe it's not getting applied at all).
Will have a look.
Added subscriber: @pepe-school-land
◀ Merged tasks: #41151.
This issue was referenced by
9fcaac5009
Changed status from 'Open' to: 'Resolved'
Closed by commit
9fcaac5009
.