Volumetric Fog

[Roy Hirshkowitz]

Working on a close relative of sub-surface scattering.  Looks like someone burnt dinner, but it's kind of interesting.

[Marc Chaumier]

Perfect! 254 pliiiiiiiiiiz!!!

[Chas / Aug Posekany]

If this was allowed to run an extended period of time would the sunlight beams through the window resolve better to predominate better or would the fog/smoke effect be adherent with using this engine?

[Roy Hirshkowitz]

Sun streaks?

[Roy Hirshkowitz]

Very low density interior fog.

[Peter Milner]

Can you adjust the size of the particles as well as the density?

[Marc Chaumier]

I agree

[Roy Hirshkowitz]

They aren't discrete particles-- (or a true density for that matter. )  What appears to be particlulate is actually just remaining noise in the path tracer.  This one ran for a half hour-- it will get smoother (slowly).

 

What you're actually specifying with the algorithm I'm playing with is a probability per unit distance that a ray entering the medium will scatter, absorb, or pass through (neither scatter nor absorb.)

[Roy Hirshkowitz]

Backlit scene.  Coming along.

[Roy Hirshkowitz]

Same scene-- thicker fog.

[Roy Hirshkowitz]

Colored fog:

[Ros. Riha]

if it was possible to adjust the properties of the fog in the nXtImage editor, that would be marvellous - is it possible, Roy?

[Roy Hirshkowitz]

Nope.