Cloth doesn't work correctly on one object #98417
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Reference: blender/blender#98417
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System Information
Operating system: Linux
Graphics card: GTX 980
Blender Version
Broken: blender-3.3.0-alpha+master.d095fcd6b417-linux.x86_64-release
Short description of error
A cloth doesn't work on the left plane but works on several objects at the right side. Orphan Data is empty. I've already done with Recursize Cleanup. Nothing happens. What's wrong with this object? Broken .blend file attached below.
"Solution":
If you just move the first plane to some other place - it starts to work.
Exact steps for others to reproduce the error
I don't know how I do this. Looks I added some Wind force and then I removed it. Maybe some problem with the cache system.
flag_test_wind.blend
blender_cloth_bug-2022-05-27_01.17.14.mp4
Added subscriber: @GMXArtist
Added subscriber: @iss
Changed status from 'Needs Triage' to: 'Needs User Info'
Please upload .blend file
Changed status from 'Needs User Info' to: 'Needs Triage'
I forgot to upload it, sorry. Uploaded.
Do you see some wrong behaviour in this file?
Looks like a cache problem, but I can't remove it.
Changed status from 'Needs Triage' to: 'Confirmed'
@GMXArtist I don't see anything incorrect in your file. Seems like a bug really.
What's wrong with this file? Is it a bug? Cloth doesn't work on one plane but works on another planes [Blender 3.3.0a]to Cloth doesn't work correctly on one objectAdded subscriber: @LukasTonne
It's a little odd, but i suspect the initial cloth is simply "too perfect" 😁
All the edges are supporting each other in perfect equilibrium, hanging from the "flag pole" on the left, balancing in a 2D plane like a suspension bridge. The tiniest bit of displacement, rotation, wind, etc. will push the system off that knife edge and make it behave like actual cloth. I guess the other two flags have just enough offset from the origin that tiny floating point errors do the job. So maybe just add a tiny amount of randomness or a wind force to get the thing started.
Just re-checked this issue and it is correct that adding some imperfection to cloth mesh does resolve the issue, so will close. Thanks for suggestion.