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Water inside of air field

water air fluid flip

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#1 ssh

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Posted 11 January 2013 - 07:31 AM

This is proof of concept for simulating water inside of air field.
The only difference in simulations is the presence of that air field.
Done with standard Houdini flip tools.
Inspired by ILM's Siggrpah talk on "Battleship".

See the huge difference and much more realistic behavior.

Watch it here:


#2 anim

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Posted 11 January 2013 - 07:34 AM

that looks amazing :)
love the behaviour of particles in the air
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#3 lukeiamyourfather

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Posted 11 January 2013 - 11:09 AM

That's very nice! Did the water and air interaction add much time to the overall simulation?

#4 ssh

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Posted 11 January 2013 - 11:42 AM

Thanks, water with air is 2-3 times slower then just water.
Worth it.

#5 Erik_JE

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Posted 11 January 2013 - 01:33 PM

Very nice!
Is there any pdf available on the talk? I tried googling but it seems my google skills are failing me.
This is either a really smart move or by far the stupidest thing that we have ever tried.

#6 chaindriver

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Posted 11 January 2013 - 06:02 PM

This is excellent Sergey! Great comparison.
May I know how is this air field created? Is it some standard node/OTL that can be plugged into my DOP network?

#7 ssh

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Posted 12 January 2013 - 08:43 AM

Very nice!
Is there any pdf available on the talk? I tried googling but it seems my google skills are failing me.


Thank you Erik, don't think pdfs exist. :)
I know it from the guys who attended it on Siggraph.

This is excellent Sergey! Great comparison.
May I know how is this air field created? Is it some standard node/OTL that can be plugged into my DOP network?


Thanks, this is very usual Flip setup with density being overrided.
Some particles(air) have very low density and some particles (water) have high density.
All is simulated in one step.
E.g. no need to simulate air first then apply cache to water or anything like that.
This is very simple setup.

#8 eetu

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Posted 12 January 2013 - 08:50 AM

First let me say: Awesome!

Is there any pdf available on the talk? I tried googling but it seems my google skills are failing me.


Probably it was more thoroughly described in the Siggraph talk, but they also talk about it in this episode of FXpodcast
A shitty theory is better than no theory at all

#9 ikarus

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Posted 12 January 2013 - 10:59 AM

Thank you Erik, don't think pdfs exist. :)
I know it from the guys who attended it on Siggraph.



Thanks, this is very usual Flip setup with density being overrided.
Some particles(air) have very low density and some particles (water) have high density.
All is simulated in one step.
E.g. no need to simulate air first then apply cache to water or anything like that.
This is very simple setup.


are you simulating the air field via a complete smoke solver or a stripped down version?
One step beyond the tools.
PopkaFX

#10 ssh

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Posted 12 January 2013 - 11:02 AM

are you simulating the air field via a complete smoke solver or a stripped down version?


There is no smoke solver involved.
Water and air are simulated with one flip solver.

#11 ikarus

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Posted 12 January 2013 - 11:06 AM

There is no smoke solver involved.
Water and air are simulated with one flip solver.


ahh okay I just got what you meant heh.

I'm suprised that density variaton would cause such a huge difference in time.
One step beyond the tools.
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#12 ssh

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Posted 12 January 2013 - 11:47 AM

Time difference is probably caused by the fact that you have to simulate much more particles.
Because all the rest of container is filled with air.

There might be way to optimize this and have air only where it's needed.
I am checking it now.
This is just a proof of concept to see how much can we get from this approach.





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