Directing volume noise along curve or normals

[Wideeagle]

Hi everyone;

 

I'm hitching my head trying to answer a basic question in houdini. I'm trying to do a vortex cloudbed like this one :

 

 

I tried different approach, and this is what I came with :

 

 

So it seems really bad.

 

This is the approach : 

 

I generate flat cloud shapes (6 different ones) , export them as .ass and then scatter them with an instance node.

Inside my instance I have a pop simulation with a vortex force applied (so each "cloud island" is moving as if it is in a vortex)

The issue I have is that I dont know how can I get a "round" shape (like a realistic vortex) since my noise is linear.

 

The current thing looks like this:

 

 

And I want my noise to follow a curve like that: 

 

 

Do you have any idea how could I do that ? 

 

Here is a screen from my volume vop to do the noise on my volume : 

 

 

Do you think the .ass scattering is a bad approach and I should do something else like just one big VDB with a "vortex noise" ? 

(The thing is that using only one vdb seems to be less controllable and really memory heavy)

 

 

Thanks a lot for your time reading this !

Edited February 9, 2021 by Wideeagle

[Librarian]

-Vimeo- by Petr Ermolaev  ..OR just search Volume deformer..
 

Master_Volume_Deform_v22.hip

[Wideeagle]

On 09/02/2021 at 8:19 PM, Librarian said:

-Vimeo- by Petr Ermolaev  ..OR just search Volume deformer..
 

Master_Volume_Deform_v22.hip

Thanks a lot it has been really useful !