Simulation zone pauses randomly during render (with "Lock Interface" turned ON) #112001
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Reference: blender/blender#112001
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This bug has an easy workaround, mostly posting this so anyone running into the same issue knows the solution.
Broken: version: 3.6.2, branch: blender-v3.6-release, commit date: 2023-08-16 16:43, hash:
e53e55951e7a
Worked: N/A, 3.6 is the first version with simulation nodes.
In Eevee, Cycles, and Workbench, rendering an object with a simple simulation zone applied in geometry nodes results in some rendered frames being duplicates of each other, effectively making the simulation pause at random in the final render.
The workaround is to bake the simulation zone result before rendering (see screenshot.)
Check out the attached .blend file for reproduction.
I'm not able to reproduce the issue. Will close this for now. Please reopen if the issue still exists. In that case, please also try to provide an example that doesn't render 5000 frames.
This issue still exists on the current release of 4.0:
As well as the current beta of 4.1:
See the attached images for examples of identical rendered frames.
I apologize for the long file, it was originally used in a bug report for a rarer issue. I have shortened the render time to 500 frames. I have also attached examples of what frames 250 and 500 should look like. If the simulation is pausing somewhere during the render, these will not match with what is actually rendered.
Since the issue is intermittent, you may have to run the render a couple of times to see it come up. In case this is relevant, I will also note that I am not rendering from the command line, instead using the "render animation" option in the interface.
I found the provided files are not reproducing the issue. but I noticed that once you enable "Lock Interface", it will very likely trigger the stop around 20+ frames.
![image](/blender/blender/attachments/7804384f-9f01-4898-a496-181983d5c76e)
Hi, unable to confirm in current main
09666e149871769b5b77ac8c2a404e3a4ea35f30
Can we know steps used here for replicating the issue to ensure we're on same page? What I did is:
Hi, Baking the simulation is a workaround to solve the problem, where the problem is shown if you do not bake.
In short, Render simulation without a bake + "Lock Interface" will pause the render simulation very quickly. If You do not Lock Interface, it will render to the end without problem.
Thanks. Still not able to replicate though (without baked simulation)
Have you activate "Lock Interface" as suggested above? I can still reproduce it in the latest main.
4.2.0 Alpha, branch: main, commit date: 2024-03-14 00:20, hash:
09666e149871
yes
hmm, that's weird. It's so easy to replicate on my end.
Here's a recreated file, everything is already set. People should just render animation brainlessly to check if the problem exist.
People should find that in the viewport the cube is rotating. but in the render cube is not driven by the simulation.
So to reproduce just "Render Animation"? The cube isn't moving at all
I can confirm with Blender 4.2 from today on Windows 11
Yes, that's exactly the problem discussed here. If you play the animation in the viewport, you can see the cube is rotating due to simulation nodes. So you can confirm the issue as us.
"Lock Interface" prevents the simulation node from working.
hmmm, for comparison I tested how other blender simulation behaves.
It seems cloth simulation can work without a bake in Lock Interface,
but Rigid body and softbody will stop as well.
Perhaps this is a known issue, but I am still not sure.
Hmm, still not able to confirm (even in
Replica.blend
) :/#99700
Funny, I don't even remember writing that report :)
I can only say that I am on windows, nothing more.
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 531.61
I'll ask in triaging channel for help.
I'm on windows as well:
Maybe it is reproducible for you in background mode :)
blender -b Replica_Ray.blend -a
The animation doesn't move as it should.
Unrelated to this bug: Shouldn't Blender print a message where it saved the .mkv file??
Nope, can't confirm in background mode either :/
I can confirm
Simulation zone pauses randomly during renderto Simulation zone pauses randomly during render (with "Lock Interface" turned ON)