making smoke

Good particle smoke requires that a significant number of particles be overlapping at any given point. Increase the radius of your points, and decrease their alpha.

Thanks for that advice, I think it looks better now:

any other sudgestions?
Thanks.

Yeah: it's way too thick. Remember: smoke disperses horizontally as well as vertically. Decrease the alpha some more, and add horizontal dispersion.

Also... smoke grows bigger as it rises up in the air. (What he above said)

Start small - grow big :D

Hows this:

Thanks.

Your diffusion looks great!

Do you think that your fuel source would be a black body emitting visible radiation?

Why not put a hemispherical boundary around that and tint the smoke particles within it accordingly, inverse sqrt fall-off is the general method.

However, you could also do a volumetric trace from each particle to the hemisphere's centre, counting the number of collisions with other particles along the way.

Tracing from the centre of the hemisphere toward the particle would work equally as efficient, I believe.

A bounding sphere for the particle object could also be used to determine incidental opacity by measuring the length of the line between where the ray enters and exits the sphere. Light absorption per-particle then becomes a matter of how long in time the light had to travel through the particle. Light is not infinitely fast. :)

Quote:

Original post by daniel_i_l Hows this: Thanks.

Looking good. There's still some hard edges around the smoke particles, though. Make sure the alpha of the texture itself fades to transparent, rather than having a hard border.