Mirroed Collection Intances have flipped normals/face orientation. #64284
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Reference: blender/blender#64284
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System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.39
Blender Version
Broken: version: 2.80 (sub 60), branch: blender2.7, commit date: 2019-05-07 19:17, hash:
3dc9da3a74Worked: version: 2.80 (sub 60), branch: blender2.7, commit date: 2019-05-03 21:09, hash:
ee0d8426abShort description of error
Mirroed collections instances have flipped normals in 3D viewport.
Screenshot of viewport with face orientation turned on.
Blue cube is the original mesh in a collection. Red cube is the collection instance mirroed in the X axis.
Exact steps for others to reproduce the error
Added subscriber: @Ragatol
Added subscriber: @ZedDB
Bisected down to:
ddb71e8c20Added subscriber: @fclem
According to @fclem correct fix is to use apply the flag OB_NEG_SCALE on dupli if the parent has the flag. and remove it if both are true would be nice to have that done in the depsgraph tho
Added subscriber: @Sergey
@Jeroen-Bakker so should we poke @Sergey about this?
@ZedDB yes, I also want a good opinion about it. currently OB_NEG_SCALE (and its draw manager counterpart DRW_CALL_NEGSCALE) only influences the BACK face checking, what is too limmitted. I can see @fclem analysis to be correct. But before we put any change in depsgraph I want to have some guidance on where and how.
My guess would be deg_objects_dupli_iterator_next
We noticed that normals are off due to recent changes. Here I will elaborate what my findings are. More issues I have seen might be related to this.
Scene I used for testing
#64284.blend
4 days ago
21f8e75ddbeverything seems correctCurrent master
6b082278d1shows normals inverted and mirroredSomewhere in between I see flipped normals (but not mirrored)
The inverted normals are introduced by
ddb71e8c20The mirrored normals are introduced by
733811330cIt might be that the mirrored normals was a fix so we need to check this against EEVEE normals in this case.
Broken eevee normals are introduced by
f2f62b184cThis issue was referenced by
c0b8d071a7Changed status from 'Open' to: 'Resolved'
Added subscriber: @filibis
Changed status from 'Resolved' to: 'Open'
I think this issue hasn't been fixed properly or popped again. I'm getting artifacts when I select a mirror object to use as mirror.
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-19 18:29, hash:
d30f72dfd8chair_mirror_bug.blend
Changed status from 'Open' to: 'Resolved'
Hello, @filibis
Sorry for this, but could you please open a new report, it is not related to this issue. Your issue is related to autosmooth. When you disable autosmoothing it renders fine.
I will change this issue to resolve as this is related to collections mirroring, what is working as expected.
Sorry @Jeroen-Bakker , I thought the issue is related. I created a new report for this: #66183