ferromagnetic liquid

[Nerox]

Hi guy's

I just found these great clips on YouTube about 'ferromagnetic liquid'

http://nl.youtube.com/watch?v=jY72o-JAp0Q

http://nl.youtube.com/watch?v=Lle0jenzXGo

I'm wondering is something like this ever been done in Houdini? (Maybe it's a stupid question)

Wouldn't it be cool if a effect like this could be done by painting (or a image/sequence) a magnetic field?

Any idea's how to approach sugge a simulation?

[Nerox]

I've done some test and I'm trying to get a sort of a mercury look.

The problems I run in to come to:

- I Would like the liquid to have a higher surface tension (From a horizontal point of view it must be more round, and have a little more thickness in the middle)

- It would be great if the particles would have some sort of magnetic force on a per particle base, if a single particle or a couple travel a long a much bigger group of particles the small group gets attracted by the big group.

The hardest part is i also want them to mount up, untill now the liquid ends up flat.

I've got a file ttached, where the particles mounted up. I like the liquid to split up at the collision, some parts will melt together (And mount up) and others not.

Hope some one can give me a little help on this one,

Mercury_01.hipnc

[peterr]

This seems like a natural for metaballs. So instead of using the particlefluidsurface sop, copy metaballs to your particles.

[peterr]

Hi guy's

I just found these great clips on YouTube about 'ferromagnetic liquid'

http://nl.youtube.com/watch?v=jY72o-JAp0Q

http://nl.youtube.com/watch?v=Lle0jenzXGo

I'm wondering is something like this ever been done in Houdini? (Maybe it's a stupid question)

Wouldn't it be cool if a effect like this could be done by painting (or a image/sequence) a magnetic field?

Any idea's how to approach sugge a simulation?

You should be able to accomplish this with chops and paint a grouping attribute to where you want the audio to influence the surface.

[michael]

you might also look into building a series of curves that mimic magnetic fields...then use those curves to deform the surface or drive particles etc....

http://space.newscientist.com/data/images/...12678-1_600.jpg

http://www.dailygalaxy.com/photos/uncatego...netic_field.jpg

[Nerox]

you might also look into building a series of curves that mimic magnetic fields...then use those curves to deform the surface or drive particles etc....

http://space.newscientist.com/data/images/...12678-1_600.jpg

http://www.dailygalaxy.com/photos/uncatego...netic_field.jpg

Copying Metaballs to the particles could be a part of the solution.

Maybe I can create a expression on a points Sop which raises the pScale of points located near the center of the particle cloud, to fake the illusion of liquid that has a very high surfase tension.

Has any one any suggestion for suge a expression, I do understand expressions which are writen down, but creating new one is still a hard part for me,? Maybe I can use one of the local variables of the particles like pressure.

[Nerox]

Last time I didn't succeed, but I'm catching up with this one.

So far I did manage to to get the particle fluid to collaps or build up like a drop of water would do. (cohasive) Using the 'rest density' and the 'gas constant'. But it seems very unstable in a sence that the particles inside the fluid are moving / jittering all the time and never seem to get to rest. Adding Viscosity doesn't really help since the fluid get's think and slow, since water for instance is very quick this isn't the result I'm looking for.

Is there a way to make particle fluid to rest or settle in a situation like this?

leaveDrip_V04.hipnc

Edited June 12, 2009 by Nerox

[GallenWolf]

Hmm really depends on the effect you are after, I may actually attempt doing it totally in sops, especially for the 2nd link you provided. Ray sop....

GW

[Nerox]

Last time I didn't succeed, but I'm catching up with this one.

So far I did manage to to get the particle fluid to collaps or build up like a drop of water would do. (cohasive) Using the 'rest density' and the 'gas constant'. But it seems very unstable in a sence that the particles inside the fluid are moving / jittering all the time and never seem to get to rest. Adding Viscosity doesn't really help since the fluid get's think and slow, since water for instance is very quick this isn't the result I'm looking for.

Is there a way to make particle fluid to rest or settle in a situation like this?

Using more substeps does the trick but it will cost ya, according to the processing time.

But I figured that the way a water drop reacts also depents on the surface its on, for instance a drop on a wood tabel is different than a drop on a grass halm. I don't know if houdini supports fluid behaviour and surface types (Wood, metal fabrick).

On top of that I also need to figure out how a drop of water sticks to the surface, when it gets to big or the objects shakes heavily it should fall down. Or roll around or downwards a leave.