Regression: Child hair particles set to "Interpolated" causes jittering when the based vertex changes position #112448
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Reference: blender/blender#112448
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System Information
Operating system:win10
Graphics card:RTX3060ti
Blender Version
Broken: c8c6f62cf3a3,fca8df9415
Broken: 3.5
Worked: 3.4
Caused by
d20f992322Short description of error
Child hair particles set to "Interpolated" causes jittering when the based vertex changes position
This problem seems to have been solved before,in #63534 and #56408
Exact steps for others to reproduce the error
Open the file and render animation
Can confirm, will check when this broke again
Caused by
d20f992322CC @HooglyBoogly
Child hair particles set to "Interpolated" causes jittering when the based vertex changes positionto Regression: Child hair particles set to "Interpolated" causes jittering when the based vertex changes positionHmm, I don't really see the "jittering" in the file. Could you point out where the issue is?
You have to render ctrl F12
I still don't see jittering in the rendered images.
Is that cycles?
That's EEVEE, was it meant to be rendered in Cycles?
yes
Any updates here?
Rendering with Cycles, the file provided shows fairly obvious jittering, EEVEE works as noted.
I looked into this for a few hours today and a bit yesterday. I didn't make much progress. My guess is that somehow the fact that there is a
mesh_finalin cases where there wasn't before breaks some assumption in the particle system, and it generates the children on the final deformed positions rather than the original positions. But looking into that I didn't find evidence yet.