Boiling Water

Discussions about the use of Realflow 5
dustmite
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Boiling Water

Postby dustmite » Fri Apr 05, 2013 10:11 am

I'm sure this has come up before! I'm trying to make a bubbling/boiling liquid simulation and have found this tutorial.

http://vimeo.com/11046292

However being new to realflow I'm slowing starting to breakdown what this scene involves.


I've got a few questions I was hoping someone could help with..

1 – How do you make the emitter emit intermittently. The demo shows bursts of bubbles rather than the default contain stream.

2 – Can you make the emitters spin without keyframing them?

3 – In the demo tutorial, the emitters seem to be below the object so by the time they turn into bubbles they are just entering the glass beaker. How do I get the particles produced by the emitter to go through the object? In my test they hit the bottom of the beaker and bounce off!

Any advise would be great.

–Steve


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ChristianZ
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Re: Boiling Water

Postby ChristianZ » Fri Apr 05, 2013 12:13 pm

Ah, the good old pixel pro example of boiling water. The final movie is superb, but this kind-of tutorial has also sparked a lot of questions on forums since then ;)
We discussed this previously:
viewtopic.php?f=31&t=7357&hilit=bubbles&start=0
RF10 standard, System specs: OSX 10.11, MacPro 4.1 2xXeon, GTX980Ti, 64 GB RAM

dustmite
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Re: Boiling Water

Postby dustmite » Fri Apr 05, 2013 1:08 pm

I though this wouldn't be a new question. Cheers for the link ;)

dustmite
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Re: Boiling Water

Postby dustmite » Fri Apr 05, 2013 1:14 pm

Just read through this post and I think it answers some questions, but anyone help with how do you make the emitter emit intermittently. The demo shows bursts of bubbles rather than the default contain stream.

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ChristianZ
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Re: Boiling Water

Postby ChristianZ » Fri Apr 05, 2013 1:30 pm

RF10 standard, System specs: OSX 10.11, MacPro 4.1 2xXeon, GTX980Ti, 64 GB RAM

dustmite
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Re: Boiling Water

Postby dustmite » Fri Apr 05, 2013 9:37 pm

I'm not sure I fully understand this. but I'll look into expressions more I think.

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ChristianZ
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Re: Boiling Water

Postby ChristianZ » Fri Apr 05, 2013 10:11 pm

Some additional points:
The bubbles from below can enter the glass beaker, because the fluid interactions of the beaker are set to "inside", therefore the beaker holds everything inside, but particles from outside can enter the vessel and become trapped inside. You can kill the bubbles at the water surface with a daemon depending on the age or if they touch a bounded k-daemon region.
The mesh contains both water and bubble emitters, but with the bubbles emitter set to "subtraction". In this way the bubbles are actually never forming a mesh themselves but there are bubble-shaped cavities which travel through the water upwards.
RF10 standard, System specs: OSX 10.11, MacPro 4.1 2xXeon, GTX980Ti, 64 GB RAM

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ChristianZ
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Re: Boiling Water

Postby ChristianZ » Wed Apr 10, 2013 7:58 am

A little exercise in this topic:
http://youtu.be/ACmuHYkYD0o
Slow-motion bubbles inside liquid...not very realistic, but at least the bubbles are working :)
RF10 standard, System specs: OSX 10.11, MacPro 4.1 2xXeon, GTX980Ti, 64 GB RAM

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Otuama
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Re: Boiling Water

Postby Otuama » Wed Apr 10, 2013 9:39 pm

I did a bit of testing bubbles a while ago. Initially I made this sim:

http://vimeo.com/39132565 (making of: http://vimeo.com/47083248 )

However, I actually made another setup that worked better I think and gave me this result.

http://www.youtube.com/watch?v=lRe6315t6b0

I'm having a problem with my licence at the moment so can't load the Rf scene but the below object is all you really need to get the result.

Image

I'll upload a better demonstration tomorrow (or day after) but with this object you get random bubbles. You can also control the size of the bubbles too.
Otuama - Vimeo
'Strength does not come from physical capacity. It comes from an indomitable will.' - Gandhi
'Realism is in the eye of the beholder' - Me ;)

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ChristianZ
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Re: Boiling Water

Postby ChristianZ » Thu Apr 11, 2013 10:04 am

Cool stuff, looking forward to learning more about your method.
RF10 standard, System specs: OSX 10.11, MacPro 4.1 2xXeon, GTX980Ti, 64 GB RAM


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