splitting volume?

[Ian10210123]

This problem has been bothering me for a long time.

I want to recreate Simon's tide. I've been check out all the comments and discussion which talks about this.

I've organized the following tips：

1. It drives by COPS pattern. Maybe he used the gradient as velocity field.

2. It uses 2d pyro solver

3. turn volume to heightfield and render as displacement map.

 

What I tried and can't figure out：

1. volume can split, but it don't stop. They will curl and make circle. It should still go forward and split.

2. It's not Rayleigh Taylor Instability which is triggered by density. 

 

[Librarian]

@Ian10210123 I posted that 3 years ago He use SphericalClebschMap you have files on Youtube Berlin MAth + advance MATH for Houdini to make those math Fileds   , also used velocity field (FLOW DATA) , volume_musical_isomorphism1 , magneticLaplacian, AKA Clebsch_solver, therefor he gets nice transition , you can also make this with regular velocity field on 2d volume with 4 different curves   , Just listen to Him on the end of that Video presentation when someone ask him HOW???  ..
 

v@s = point(0,"s",vertexpoint(0,@vtxnum));
v@uv;
#include "math.h"
float theta = acos(@s.y);
float phi = atan2(@s.z,@s.x);
@uv.x = phi/(2*PI);
@uv.y = theta/PI;

Just One PIC,( imagine this with sequence Frames) just simple ex.
Just search Clebsch_solver BERLIN MATH Houdini  files exist Have FUN.

Edited Tuesday at 08:03 AM by Librarian

[Ian10210123]

16 minutes ago, Librarian said:

@Ian10210123 I posted that 3 years ago He use SphericalClebschMap you have files on Youtube Berlin MAth + advance MATH for Houdini to make those math Fileds   , also used velocity field (FLOW DATA) , volume_musical_isomorphism1 , magneticLaplacian, AKA Clebsch_solver, therefor he gets nice transition , you can also make this with regular velocity field on 2d volume with 4 different curves   , Just listen to Him on the end of that Video presentation when someone ask him HOW???  ..
 

v@s = point(0,"s",vertexpoint(0,@vtxnum));
v@uv;
#include "math.h"
float theta = acos(@s.y);
float phi = atan2(@s.z,@s.x);
@uv.x = phi/(2*PI);
@uv.y = theta/PI;

Just One PIC,( imagine this with sequence Frames) just simple ex.
Just search Clebsch_solver BERLIN MATH Houdini  files exist Have FUN.

Thank a lot @Librarian ! There's a lot of math inside  

I'll try to figure it out

[Ian10210123]

@Librarian
Sorry for bothering again. I can't find the video or any useful link.
But I found this. Your comment before mentions Clebsch, but the website failed to show anything. 

 

[Librarian]

@Ian10210123

https://dl.acm.org/doi/10.1145/3072959.3073591

[Ian10210123]

@Librarian

I tried some combination. I tried to use curves and noise ramp as vel field. Also I increased the resolution of hbar and voxel size.

Maybe I missed out something.

I'm not sure it's the way how Simon made the result.

[Librarian]

OK @Ian10210123 can we Try together here on Forum to make that effect ??? Can you post File that you experimenting with ???

[Ian10210123]

@Librarian  Thank you so much

Please find the attachment below

example_2Drotation_try.hip

[Librarian]

I was thinking of all of us here on the Forum , not only @Aizatulin @konstantin magnus @fencer @Atom or @hannes603  .......or me
Plus you don't have pyro working on that Scene I don't se simulation on 2d . Where its your file where you try !! Before you Ask here on Forum?? Just wondering...But that's Utopia for me @Ian10210123

Edited 15 hours ago by Librarian

[Ian10210123]

Weird

I put the simulation in Clebsch_Map_Visualization

You also have to install both otls in the webite

https://dl.acm.org/doi/10.1145/3072959.3073591

[Librarian]

Yes otls and SCIPY Numpy Python. Then you must save that 2d animation like sequence and  merge that sequence into shader .
Here you have nice  EX files for vel fields @Ian10210123
 

[Ian10210123]

Sorry for not providing my previous file before. It's kind of messy and stuck in very beginning. I tried to build a new one.

I tried to use noise as vel field to push volume in 2d, but I can't really figure out the sub-motion like "tide.

I guess probably everyone can do the similar setup.

tide.4.hip

Edited 10 hours ago by Ian10210123

[fencer]

Maybe this should help.