Retrieving evaluated mesh when realizing geometry nodes instances can fail #89905
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Reference: blender/blender#89905
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System Information
Operating system: Linux-5.11.0-7614-generic-x86_64-with-glibc2.32 64 Bits
Graphics card: Quadro RTX 6000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.73.01
Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-07-16 07:47, hash:
038345fa56
Worked: Caused by {bfa3dc91b75407b063f2ac991b176d98c050f92d}
Short description of error
When realizing many instances from a collection info node, often many instances will fail to appear. It happens more often when there are more instances, and it depends on threading.
vertex_groups_evaluation_bug.mp4
vertex_group_evaluation_failure.blend
Exact steps for others to reproduce the error
Open sample file, enable viewport visibility of
Plane
object. Repeat.Simpler example:
Toggle visibility for the "Points" object. Repeat until only some instances appear.
#89905 Reproduce.blend
Added subscriber: @SimonThommes
Changed status from 'Needs Triage' to: 'Confirmed'
I've done a bit of investigation here. The problem seems to be a bit bigger than just the vertex groups, and I can also replicate it by realizing the instances before distribution.
Sometimes the mesh generated from joining the instances is smaller than other times:
It doesn't happen in a build without TBB (no threading).
This is quite odd, I'm not sure how the vertex refactor would cause this! I'll continue investigating later today.
Further investigation reveals that
BKE_modifier_get_evaluated_mesh_from_evaluated_object
sometimes returns NULL when gathering instances meshes to be realized.I think I will bisect this just to make sure it's actually caused by the vertex group refactor.
Bisecting finished, and it points to
bfa3dc91b7
Honestly that makes a lot more sense based on the behavior I was observing when meshes are collected for instancing.
Vertex group evaluation failing on realized instances in geometry nodesto Retrieving evaluated mesh when realizing geometry nodes instances can failAdded subscriber: @HooglyBoogly
Added subscriber: @mano-wii
Maybe @mano-wii has an idea of the cause here?
Changed status from 'Confirmed' to: 'Resolved'
Solved by
ceb612a79c