particles Particle sim advice

[plazadelmar]

At 00:30 sec there is this beautiful particle effect in this video. Any suggestion how this was made?

 

[Librarian]

@plazadelmar

Find Yuya Torii on qiita houdini Advent, for growth solver's. For velocity FUN.
On twitter you have  user "Whitedog" for pyro solver . But you can find here on Forum also .
Than on Forum you have how to advect particles with volumes .
trick maybe with colors its to use on volume wrangle if you have Cd, temperature and Density fields ,than you can use attribute from volume to transfer color to particles .

if(@P.y > 0.1){
    f@density = 0;
}

f@temperature = fit(f@temperature,0,chf("src_max"),0,chf("target_max"));
v@Cd = chramp("Cd",f@temperature);

Use also switch(in Sop) to change diff colors  and enable solver(in Dop) with expression something like  $F<8 || ($F>45 && $F<53) || ($F>90 && $F<98) || ($F>135 && $F<143) || ($F>180 && $F<188) || ($F>225 && $F<233) to change different movement of velocity that you have ..
in your case with those growth ivy solver's tangentu .That you shift.

v@tangentu *= -0.3;
//v@tangentu *= 0.3;

and when you use volume from attribute(to transfer vel) make in Y direction  3 or 4 copy's of that velocity .


Have Fun.

 

[Librarian]

@plazadelmar Check Volume Optical Flow Tutorials.