The overlay for bone ik limits has visual artifacts #77803
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Reference: blender/blender#77803
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System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14
Blender Version
Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash:
211b6c29f7Worked: 2.82.7
Short description of error
The sphere that is drawn in the 3D viewport after you select a bone with ik limits has visual artifacts. As far as I can tell, this always happens and requires no special reproduction steps besides creating an armature bone with ik limits enabled under the 'Bone Properties' panel.
Out of curiosity, I took a look at the code. The cause appears to be, that the shader, which is used to the draw the lines of the ik limit overlay, is also used for drawing the sphere. The shader (armature_wire_frag.glsl) does antialiasing for lines, which causes artifacts when it is used for not-lines.
Exact steps for others to reproduce the error
Create an armature with at least 2 bones. Then select a bone and enable ik limits on the x and z axis.
ik_overlay_bug.blend
Added subscriber: @ramon_grill
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @mano-wii
Added subscriber: @Jeroen-Bakker
Seems like it draws into the lineTex buffer with alpha 0.
It does draw the solids to the linesTex and colorTex. and afterwards the outline is drawn on top. When drawing the solids it should not effect the lineTex.
This issue was referenced by
17ddb4c4eaThis issue was referenced by
e54058b121Changed status from 'Confirmed' to: 'Resolved'
I retested this on the latest daily build and the sphere is now invisible. It does obscure other overlays, so something is being rendered.
version: 2.90.0 Alpha, branch: master, commit date: 2020-06-19 13:42, hash:
59b523c3c9, type: Releasebuild date: 2020-06-19, 12:31:39
Added subscriber: @fclem
Changed status from 'Resolved' to: 'Confirmed'
@Jeroen-Bakker you need to make sure the shader still writes to the lineTex buffer. Otherwise it's Undefined behavior. I overlooked that in the patch.
This issue was referenced by
e553408beeThis issue was referenced by
0aa7c11788Changed status from 'Confirmed' to: 'Resolved'