Hi all
This is one of my first attempts to make a kind of cigarette smoke.
It is a 800x600 with AA 0.3 render, with radiosity and 4 (I'll explain)
light sources (the 'sun' is an area_light). It took 4 hours on my XP
2000+ to render.
The smoke itself is a cone filled with a media whose density is a
function of my own. I had lots of pbs with the function, because if I
want a shape that matches most a real cigarette smoke's one, the
function must be very complex, and the render time reachs the sky. And
because of the color too. It seems that if I want blue reflects in the
scattering media, I need to set up his color to something like <1, 1,
0.5>. I understand it for absorption, but what about defuse light in
scattering media ? Am I forgetting someting ? Finally I choose a
scattering media with a very little extinction, and some emission and
absorption.
Not much to say about the ashtray and the cigarette (and no words about
the ugly environment :pp). The cigarette is just two cylinders with
color_maps. The red glowing part (sorry for my bad english) is two mixed
isosurfaces, one filled with a grey pigment, and the other with a red
emitting media. There are three red fading lights around the glowing
part, to make a red glow on the ashtray and on the smoke. This surely
needs to be improved, because of what happens on render time :(

Any comments, suggestions, questions ? Does anyone know how to make
realistic cigarette smoke ?

-- 
Jul### [at] cnedraorg
http://www.cnedra.org

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