get rid of mushroom effect in explosion and add details in the opening

[jacob clark]

Hey Jeff,

This is great info for a commonly faced problem in Houdini. Any chance of these solutions, or information making it into the package?

Also, we've had great luck varying Disturbance by the speed of the Simulation. Actually Sam Hancock figured that one out. Really saved us on some prevous shows!

-j

[Guest tar]

Awesome info; If Jeff had a 'tip' jar I bet he would be very rich

[Solitude]

Great infos. I'd really love to see this kind of info put into the docs with some example images showing the differences (as well as sim time differences) between some of the techniques too.

[Diego A Grimaldi]

Damn Jeff, such a good read! Thanks

[Nicholas Yiallouris]

Thanks for the valuable info !

 

One question, how would one "set the density field as both your Threshold Field to control the cut-off threshold for the disturbance"

 

Not sure of the syntax to read a field in.

 

Thanks

[rayman]

I'll just leave this one here. Very easy and controllable way to add details to the simulation, that I wanted to try for such a long time.

 

Cheers!

DOP_particleVorticles_v08.hiplc

Edited October 29, 2015 by rayman

[Farmfield]

Awesome share, Pavel. Much appreciated.

[zhyravetsky]

Strange the vorticles doesnt work when colision is on..

[rayman]

I sent you a message on vimeo, but I'm posting it here too if anyone has the same issue :

 

Hi,

thats because you are bringing another object to simulation, and Gas Field Wrangle is not pointing to specific object data to update velocity but is using "*" instead.
To make it work find "set_vel_from_particles" node and go to Inputs Tab. There is a field called Input2 DOP Data, which points to "*/`chs("../createpoints/datapath")`". Change "*" with the name of your smoke object, for example "smokeobject1/`chs("../createpoints/datapath")`" and it should work as you expect.
Cheers!

 

Edit:

you may also try 

$OBJNAME/`chs("../createpoints/datapath")` 

if you don't want to change the name of the data each time when object name changes.

Edited November 1, 2015 by rayman

[zhyravetsky]

thanks

[kris]

Thanks Pavel! Cool example! 

[Matt_K]

Thanks Jeff!
That's a wealth of information there. Much appreciated.

Matt.

[Midasssilver]

Dang Jeff. You are the man

[HM_2020]

Know this is old, but jesus old school, thanks!

 

[Atom]

Here is an example file from Houdini FX Japan that nearly eliminates the mushrooming effect.

MicroSolver_Sample.hip

Edited December 28, 2021 by Atom

[Drunkenpanda]

Hello dear people,

in this video there is talk of projecting vortexels on the isosurface of simple sim.
The talk had scene files but no scene file in the final image, and it`s increadably hard to work out how to combine them,
Doesn annyone know ?

[paranoidx]

On 3/8/2024 at 12:44 AM, Drunkenpanda said:

Hello dear people,

in this video there is talk of projecting vortexels on the isosurface of simple sim.
The talk had scene files but no scene file in the final image, and it`s increadably hard to work out how to combine them,
Doesn annyone know ?

Is this video what you mean. I have a setup microsolver vorticle for both DOP and Sop Solver on Gumroad (with coffee price). Houdini Pyro Vorticle Micro Solver setup. Setup for both DOP and SOP Solver here https://vupham.gumroad.com/l/bjwvg

https://www.sidefx.com/docs/houdini/shelf/seedvorticles.html 

 

Edited May 6 by paranoidx
add shelf-tool link

[Drunkenpanda]

great thanks for doing that!

It`s missing the crucial step where he ray s them onto the smoke surface though.