Liquid cache of type "Replay" doesn't get invalidated when moving participating objects #76095
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Reference: blender/blender#76095
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System Information
Operating system: Ubuntu 18.04
Graphics card: irrelevant
Blender Version
Both broken:
d712f1f83a
23 Apr 2020826f6dd9ee
23 Apr 2020Short description of error
Moving objects doesn't invalidate a "Replay" cache once the liquid simulation has started.
In short: If I cache the first 3 frames, then I add/remove/move some element, resuming the animation still works using the original flow objects and effectors.
In the other simulation engines that allow "Replay" modes (e.g. rigid body, cloth), either resuming or going back to frame 0 and re-starting the animation would invalidate and recompute the cache, if something has changed in the meanwhile.
However: if I change any Liquid settings on a effector or flow object, then the cache correctly gets invalidated. And from that moment on, moving that object correctly invalidates the cache. So, in some way, the invalidation check is "hooked" to Transforms starting from the first time some Liquid parameter gets changed.
Exact steps for others to reproduce the error
1) The bug
2) investigation
(continued from the steps above)
Added subscriber: @NicolaSap
#82051 was marked as duplicate of this issue
#81450 was marked as duplicate of this issue
#80947 was marked as duplicate of this issue
#79422 was marked as duplicate of this issue
#76911 was marked as duplicate of this issue
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @sebbas
Added subscriber: @ankitm
Added subscriber: @lichtwerk
@sebbas: still a bit on shaky ground in regards to what is supposed to work in manta and what is not, but this sounds like a bug to me...
Added subscribers: @blenderhighschool, @Nikhil.Net, @mano-wii
Thanx Germano.
Waiting for RESET CACHE button... :)
Added subscriber: @LiborBatek
Hi, I would rather post it also in here...the cache playback problem is still present (Blender 2.83.5) so I ve recorded the issue with it here
video demonstration of playback issue
Added subscriber: @Mach
Added subscribers: @MahyarArdakani, @iss
Added subscribers: @RedpaX, @girafic, @StephenSwaney, @jenkm
Closed as duplicate of #84369