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polterizer

Whitewater houdini 17

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Hey!

Once im testing the new ww, wanted to ask here some points of the new h17 ww :

 

- Seems very slow sim in big flip simulation, 4x more slow than the old ww of 16.5, probally my bad but i leave most default just for test lol... and i dont use the opencl, also disable stiffness "constraint stiffness as 0". any know what is doing slow? sometimes crash the pc more than 200% ram used.. 

- One thing interesting for me is i am seeking where i can disable the spray and bubbles? where i can control the spray? :D.

thanks
cheers
Carlos

 

Edited by polterizer

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 hi Carlos,  I'm not sure what is slowing your scene down so much.  I've found the new whitewater solver to be much faster/better than the old one.  I don't think you can set constraint stiffness to 0 and still get usable results (not sure though).  Unfortunately there isn't a tut on the new whitewater solver,  but this tutorial is related:  (the pop fluid node is inside the ww solver).

 

 

 -G

 

 

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hey, 

yeah, must see a tut, i was testing tweaking stuffs, i dissable the clumping density control and doest fast sim, looks more faster than old one, the problem seems the density control, that makes me 200% ram out, also i increased the voxels for a low density but doesnt make sense. lets see the comming tutorials :D

thanks for the tips!

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On 10/22/2018 at 5:31 PM, polterizer said:

hey, 

yeah, must see a tut, i was testing tweaking stuffs, i dissable the clumping density control and doest fast sim, looks more faster than old one, the problem seems the density control, that makes me 200% ram out, also i increased the voxels for a low density but doesnt make sense. lets see the comming tutorials :D

thanks for the tips!

 

On 10/22/2018 at 4:36 PM, ranxerox said:

 

 hi Carlos,  I'm not sure what is slowing your scene down so much.  I've found the new whitewater solver to be much faster/better than the old one.  I don't think you can set constraint stiffness to 0 and still get usable results (not sure though).  Unfortunately there isn't a tut on the new whitewater solver,  but this tutorial is related:  (the pop fluid node is inside the ww solver).

 -G

 

 

Polterizer seems to stand correct regarding the whitewater solver issues when doing BIG/HEAVY sims. My H17 keeps crashing every time due to extreme RAM values. Did you ever figure this issue out? The only thing I could successfully output was the whitewater source cache. 

Edited by Solo

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Cache the emitter and try partition it into smaller sims. Its advecting thru a velocity field and I dont think anyone will notice if its not perfectly density constrained.

Edited by mawi

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On 12/11/2018 at 4:29 PM, mawi said:

Cache the emitter and try partition it into smaller sims. Its advecting thru a velocity field and I dont think anyone will notice if its not perfectly density constrained.

Ahhh yes. I forgot about that idea despite doing this in the past! Thank you. 

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Here is my simple code for grouping H17 particles into pre H17 whitewater groups.

i@group_foam = 0;
i@group_bubbles = 0;
i@group_spray = 0;
if (@spray>0.0) {
    i@group_spray = 1;
} else {
    if (@foam>@bubble) {
        i@group_foam = 1;
    } else {
        i@group_bubbles = 1;
    }
}

 

whitewater_groups.gif

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On 12/13/2018 at 9:44 PM, Atom said:

Hwhitewater_groups.gif

Nice work! Thank you for this. Because of the issues, I ended using the whitewater solver from H16.5. I'll have to try your method out though. :) 

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nice answers, ive found information about the new ww h17 getting problems with the ram, its the windows , some guys with linux says working fine... i must test it with linux for be sure.

 

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I have the same problem with memory consumption of the ww solver in H17 (windows).

Switching off the density control reduces memory consumption to about 25%.

In my actual sim I can only get to around 7 million particles. But I would need something like 50+ million to get a decent look.

So is this a bug or does the density feature just need this massiv amount of RAM?

Cheers

Rico

 

 

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Was having exact same problem, when it gets real big, it just crashes houdini
I need much more particles as well (using windows 10)

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My problem was solved when using Linux by the way. When windows started getting high in RAM usage it got really bad (crashing). Even on a two 90+ GB ram machines.

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Lemme ask you guys - is there any news on that strange density control behavior ? Brutally unusable under windows. I wonder, is there any plans to make houdini work without locking ram (reserved ram never cleans up) ? 

Edited by Paul Oblomov

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