Houdini mixing smoke colors with different densities
Added 2019-11-02 19:27:52 +0000 UTCUpdate 25-11-2020:
Since this is only a two dimensional sim I forgot to checked that option in the Smoke Object, so when you change the sim resolution you wont have to manually tweak the grid size depth to be one voxel, it will do it for you.
Also pay attention to the sourcing nodes "inside the dop network" when you change the resolution, it's animated to stop putting (density ,temperature ,Cd) after around 50f, so you might want to play with it a bit as well.
Original:
Doing colored smoke used to be a bit of a hassle in Houdini but as of version 17 it became easier and here I'm showing it with a density cheat so each color will have a different density, it's nice to see how colors mix.
This is done only on single voxel depth so it's relatively fast to sim, and it also can be used for paint color mixing effect, just push up the resolution and play around with the emitters (pos, shape, densities) and you will be amazed by the outcome.
