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Linked objects jumping around during render
Closed, ResolvedPublic


System Information
Operating system: Ubuntu 19.10 and macOS Catalina
Graphics card: RTX 2080 ti

Blender Version
Broken: 2.81 onwards
Worked: 2.80

Short description of error
Armatured collections linked into an animation file are jumping around at render time (see the attached video).

Exact steps for others to reproduce the error

  • Open 'linking-bug-animation.blend'
  • Render animation

The bug is random, sometimes the linked objects will jump on a frame, sometimes they won't. We've been working around this bug by re-rendering frames. The bug occurs with both Cycles and Eevee.

The blend files are stripped down versions of project files currently being worked on. I've left the assets that were having issues in the project, replacing the models with simple meshes. Assets that weren't jumping around at render time have been removed. All linking is relative and using the proxy armature workflow, not the new override method.

The only difference I can see between the jumping and the non-jumping assets is the number of collections being linked in from a single blend file. The 'molecules.blend and 'plane.blend' contain several different collections being linked in and were the only things jumping around at render time. Saying that though, I've removed all but one of the plane collection links in 'linking-bug-animation.blend' and the plane still jumps.

Event Timeline

ronsn added a subscriber: ronsn.Dec 31 2019, 8:39 PM

I can confirm this issue on Linux (Ubuntu 18.04) too and it behaves different depending on if you render at 50% resolution, or as image sequence, ...
This issue was caused by this Git commit: 6183688c3560100dc1dcce3354cb622a135bc275 (rB6183688c356)

System Information
Operating system: Linux-5.0.0-37-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21

Blender Version
Broken: version: 2.81 (sub 15), branch: master, commit date: 2019-10-18 14:06, hash: rB6183688c3560
Worked: version: 2.81 (sub 15), branch: master, commit date: 2019-10-18 11:29, hash: rB725b59d9b44a

ronsn changed the task status from Needs Triage to Confirmed.Jan 1 2020, 5:31 AM