Dave Stewart

Dave Stewart

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VFX Artist
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obj-image Quick Tips
Small-scale Viscous Sim Meshing

Recent Forum Posts

Flip Fluid Volume Loss, Particles Dying Feb. 8, 2020, 3:51 p.m.

In my experience you won't always ‘see’ the particles leaking out. If you're using reseeding the solver will kill them if they end up inside the collision object, and the particles can also become compressed spatially without using particle separation.
Not much more I can suggest without taking a look at the .hip file, will crack it open if you post it here.
Cheers,
–Dave

FLIP Surface Tension in Houdini 18 - changed behavior Feb. 6, 2020, 8:22 p.m.

Thanks for the detailed reply Tamte, I generally bump substeps up higher than in the example file but I'm also getting a much stronger ST effect than before, and need to re-balance those values in H18 apparently. That plus substepping will be the trick, just need to re-think the starting values I've been using…
–d

FLIP Surface Tension in Houdini 18 - changed behavior Feb. 6, 2020, 7:25 p.m.

Hmm interesting, thanks Aslak.
I remember reading the June 5th note, but I'm seeing the exact opposite in the sample scene posted above, where grid size change (via reduced psep) does change the effect drastically.
The takeaway from all this is that all sims created in earlier Houdini versions will need to be rebalanced, and the ST coefficient will need to be reduced when increasing sim resolution.
The timescale note is consistent with previous behavior, and shouldn't affect this particular case as Timescale is set to default of 1 anyway.
Cheers,
–Dave