gas solver

[alpotnis]

hi ppl.. what am trying in houdini gas solver is ....i want a object (eg: sphere maybe) disperse into smoke (wisplike) ...rising slowly upwards and forming into another object ( eg: a box maybe). any suggestions??

-alok

[aracid]

Hey

I'm sure there a million ways to doing this but I would think a big factor is how closely do u want this to match the exact target object,

ie

do two simulations (which result in two density fields, rest fields, vel fields)

one with the sphere rising, and one with the box falling and blend from one to the other (which u could play back in reverse), (blend using the volume SOP)

treated exactly like u would blending animation,

I dont think this looks too good cause its very linear and its exactly what you'll get if u blend two objects together, a cheap ass morph

Take a look at the file attached, this blends from a sphere to a torus.

I rushed this file out using the cache sop, so it might take a while to load.

blend.hip

hope this helps

[alpotnis]

Hey

I'm sure there a million ways to doing this but I would think a big factor is how closely do u want this to match the exact target object,

ie

do two simulations (which result in two density fields, rest fields, vel fields)

one with the sphere rising, and one with the box falling and blend from one to the other (which u could play back in reverse), (blend using the volume SOP)

treated exactly like u would blending animation,

I dont think this looks too good cause its very linear and its exactly what you'll get if u blend two objects together, a cheap ass morph

Take a look at the file attached, this blends from a sphere to a torus.

I rushed this file out using the cache sop, so it might take a while to load.

blend.hip

hope this helps

thanks aracid ... it seems to work in the file u have given ...pls note i am novice at houdini and might jus ask silly questions time n now .... it does look like a smart morph and works as i get the desired result. However will it work without any problem if i apply some turbulence (wind force OR seed vorticles) to both these simulations??

Also thanks for the hip file ...makes it o much easier to understand. appreciate ur time.

-alok

[aracid]

Hey alok

no problem

the downfall of that example file is the limitation of how much noise can exist in the simulation.

you could try advect density into the shape you want but its a little tricky.

if the noise is similiar, then it should work, but its still linear, which is ugly

u mentioned just getting into houdini, so start by taking a look at the field force DOP example files.

it gives you some idea about how u can use forces to direct your density.