Child hair particles set to "Interpolated" causes jittering when groom on alembic cache #63534
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Reference: blender/blender#63534
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Blender 2.8x
Win10
Hi,
THE PROBLEM is that if you turn on "CHILD PARTICLES" and SET them TO "INTERPOLATED" MODE it causes JITTERING of them
acros surface of the geo from which roots.
When selecting "Simple" mode everything works fine - No jitter at all, perfectly sticked to the geo.
You can test it simply by switching from mode to mode to see this problem. Its already setuped for rendering using eevee but same problem using
Cycles renderer.
Note that I ve briefly tried to change export settings for Alembic during export of anim but nothing helped...still causes this problem.
Also note that when outputting alembic cache for animated object using transforms not armatures, it works ok. But when exporting alembic from armature animated
object this causes this problem.
please see this Zip archive with readme info and example scene....
Hair_Test.zip
Thank you,
Libor
Added subscriber: @LiborBatek
#67038 was marked as duplicate of this issue
here is some rendered animation with close up of the hair particles jittering on my animated model (alembic cache)
pls when viewing change quality below video to highest resolution (1080p) or just download and playback at your desktop
Thx again.
L.
Added subscribers: @dr.sybren, @lichtwerk
Confirmed on first sight
(Looks like 2.79 has a similiar issue even)
@dr.sybren: mind having a look?
@LiborBatek please put the description of the issue in this task, instead of hiding it in a ZIP file. Hiding it like this makes it invisible to the search engine, and makes it harder for developers to access as well.
@dr.sybren ok, sorry not doing it before....should be done right now
Added subscriber: @SerjMaiorov
Have the same problem, here is a side by side basic test
InterpolationTest_001.mp4
I ve tested to render animation with mblur and hair on alembic cache and there is some problems too....not sure if it corelates to the above mentioned problems or its kind of new problem.
EXAMPLE_MOV (Apple ProRes)
still frame from animation with mblur...seems like hair particles doesnt refer to preceding frame position of the hair particles (not sure If I shouldnt use bake cache for particles??)
they spread from world origin
Added subscriber: @evantryan
#56408 might be related...
Added subscriber: @CarlosPuebla
Added subscriber: @brecht
@dr.sybren: any chance to have a look at this? [still wont consider this High prio -- but I know at least two other studios suffering from this as well, and having to go .mdd/.pc2 instead...]
(how did this work for Spring btw.?)
CC @brecht
@LiborBatek please provide us with a valid example file. The ABC file from the attached zip seems to be corrupt:
It would be helpful if they could provide:
AFAIK we didn't put hair on top of Alembic cashes.
@dr.sybren: I have updated #56408 with a file that has both abc and pc2 caches (pc2 renders fine, abc not) including the output sequences.
I assume these reports are really about the same issue (and could be merged?)
Closed as duplicate of #56408