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Mantaflow: Same particles for Spray, Foam and Bubble
Closed, ResolvedPublicBUG


System Information
Operating system: Windows 10 Pro
Graphics card: RTX 2070 and GTX 1060

Blender Version
Broken: ( 2.82, 5467f3de3a4a, master, 2019-12-18, as found on the splash screen)

Short description of error
Every time I press bake on the Particels of my Fluid Domain the Particle systems of Spray, Foam and Bubble are/look the same.

Exact steps for others to reproduce the error

  • Bake simulation.
  • Bake particles.
  • Check out the resulting particles.

Event Timeline

Jacques Lucke (JacquesLucke) changed the task status from Needs Triage to Needs Information from User.Dec 29 2019, 2:20 PM

I just did a low resolution bake, so maybe that changed the results. Maybe the simulation does not produce any particles other than FLIP particles? I don't know.

Please provide a screenshot or short video that shows the issue.

@Sebastián Barschkis (sebbas) can you also have a look at this?

Jonas (JDMations) added a comment.EditedJan 6 2020, 3:42 PM

@Jacques Lucke (JacquesLucke) Hey sorry for replying so late, The problem that i am experiencing is that I wanted to do I water simulation with the new Mantaflow simulator, as I saw that it can add particles like foam, when I tried to bake those particles, spray and bubble particles too, I saw that all the particle systems are exactly the same, as I switched them on and off to see if they were different, if you try to switch the "viewport display" option on and off, you will see that all system look the same.

Also weirdly I cannot open my blender file anymore, even with the same blender version I was able to open it before

Same here. Baked a simulation, added all 3 particle types and baked them as well. The 3 generated particle systems on the object contain exactly the same particles.
Simple .blend is provided - rebake necessary of course. (Also, I have the feeling that
a) the initial normal velocity of my inflow object gets ignored and
b) nothing is visible or changing in the viewport after the first baking step "Bake Data" - no Flip particles are created, but those are probably different tasks)

Using 2.82 Alpha buildbot build 2020-01-07 16:11, hash 55daa0d44483

Germano Cavalcante (mano-wii) changed the task status from Needs Information from User to Confirmed.Jan 9 2020, 6:29 PM

The file attached to the report takes a long time to bake.
But I can confirm with the file attached by @Tobias Kummer (tobkum) and also in the file of this other report T72972

Bastien Montagne (mont29) changed the subtype of this task from "Report" to "Bug".Jan 14 2020, 3:13 PM

Spray, Foam and Bubble simulations shouldn't be the same. there's a conference by Sebastián Barschkis on Blender's YouTubes where he shows how it works. Velocity doesn't work for me for liquids inflow either.

There is a Combined Export setting that is supposed to distinguish if particle systems of secondary particles are merged into one cache or not.

By default it is Off and there should be 3 particle systems with 3 different caches.
But it looks like this setting is ignored. And whatever choice is set ; all types of secondary particles are always merged.

@Jonas (JDMations) I just pushed some updates for the secondary particles. Can you try out the latest Blender version and see if it solves the issue?

This comment was removed by Tobias Kummer (tobkum).