FLIP fluid particles growth?

[oG.nm]

Hi all,

I'm a beginner with Houdini. 

I'm trying to make a test combining the two systems i saw on Vimeo. It's a RBD to FLIP conversion by Johhny Farmfield and i found a example of a PyroFx converting to VDB, representing a frozen smoke. I'm trying to make the FLIP fluid freeze after some time by selecting the points from the fluid in a growth manner, and mesh those points in a still frame, like in this video: 

Is it actually possible to select points in this way, are FLIP fluid particles selectable like ordinary points?

Thank you all in advance for the help!

 

 

[Sean-R]

Should be possible. You would have to add an id attribute to the fluid though, which can be enabled in the flip solver under the Particle Motion --> Behavior tab

[oG.nm]

Thanks for the suggestion.

I guess the id attribute gives me the actual point number of the particles. But still couldn't work around how to select them in a growth like manner.

Could you post like a simple example?

[Sean-R]

Hey!

So, I realised that as it's on a single frame you don't need to set an id attribute and Ben's set up will work with a fluid sim. I've attached an example

frozenFluid.hipnc

[oG.nm]

Hey

Thanks for the reply, i will get into it. But I wanted the water to splash out, and the simulation to run normally, and suddenly to freeze it, from the center and outwards, for example. So I think there should be some ID to the points. This way is just a bunch of points that are standing still

I did manage to make it work but not in this way. I meshed the fluid, then converted it to a VDB Volume, and used a animated box and converted it also to VDB. Using a Solver node and Combining VDBs managed to stack them together and then mesh that out. It works, but its not natural looking, there is no falloff in the combining volumes, so i wanted to try it with a growth methode.

[oG.nm]

Something kinda like this:

https://vimeo.com/93965461

Also, i dont know how to use that ID attribute. Guess it's more complicated than it seemed to me at first

[oG.nm]

I found another cool example, that is pretty much what im looking for  :

On 47s

https://vimeo.com/99100961

 

Edited January 15, 2018 by oG.nm