[Bf-committers] Particle fluids buoyancy... wellcome gases :)

[Lukas Tönne]

Hi Raul!

>  las nigth I have implemented a buoyancy force for particle fluids that
> will allow simulation of gas particles, not just liquids that are the
> widespread solution, and since those parametters could be animated I
> start imagine boiling watter ;)

Wow, this looks great! :D

Have you thought about rendering gases yet? I guess this is a
different challenge, since you cannot approximate gases by a sharp
surface boundary (except for very stylized art perhaps). Point density
texture might be the right answer, but you may have to add additional
turbulence to get small scale detail. Point density textures already
support turbulence, not sure if that would be sufficient (afaik the
current smoke simulator uses a similar technique, using wavelet
turbulence for small noise frequencies or so. Just wildly guessing
from my limited knowledge.)

I suppose you used a turbulence modifier on that empty to make those
particles move "randomly" ? If so, you might be interested in the flow
noise method i use, here's a small test video used with a volume
texture: http://vimeo.com/8929215. This could easily be applied to the
turbulence modifier to avoid the static behaviour (particles
essentially clumping in the same places all the time). Until now it
seemed i was the only one actually interested in this, so i didn't
make a patch yet, but it can be done quickly. I know very little about
actual fluid simulation, so i don't know if this "fake" turbulence
could/would be replaced by inherent fluid features.

Just hope your particle simulation is not too efficient, so that there
might still be a place for my own fire sim ;)
Keep it up!

Lukas