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vector
02-14-2013, 12:19 PM
Looking for a cigarette smoke tutorial I watched time ago: A lot of particles as hypervoxels to get a very nice result. I used google and the... searching tool? of the forum but no luck. Have anybody that tutorial in his markers or favorites?

Vector

stiff paper
02-14-2013, 01:07 PM
I don't have a link to the tutorial.

But there's this thread:
http://forums.newtek.com/showthread.php?35898-Any-new-cigarette-smoke-tutorials
...and there's a free scene (the second one, reupped by Dodgy.)

prometheus
02-17-2013, 06:53 PM
Looking for a cigarette smoke tutorial I watched time ago: A lot of particles as hypervoxels to get a very nice result. I used google and the... searching tool? of the forum but no luck. Have anybody that tutorial in his markers or favorites?

Vector

I havenīt seen such tutorial ever really..arenīt you confusing it with something? just wondering.

you either use larger scale hypervoxels and let the texture effect do the job, and in such case the motion is faked through the procedural effects which are semi real more suitable for engine smoke or steam.
Or you could use a whole lot of particles reaching millions and even render multiple passes, and mix together in post, a cigarette smoke is very comples with itīs typical vortex swirl...
suggestion would to be and create one emitter doing the vortext swirl and mix with other wind velocity forces.

Three years ago I was fiddling with smoke and very very tiny particles...
http://vimeo.com/5822817

some others...
http://vimeo.com/user680656/videos/page:5/sort:date/format:thumbnail

You can today get even better result since you can get over 8 milions of particles to render, but it will cost to let the particles settle and do its thing.
Try and keep particle clusters close to eachother and treat swirl by swirl independent from eachother.
a slight stretch on particles velocity helps smoothing things out + or particle blur, or use image filter vector blur, or post process blur.
Also by adding noise fractals on the particle emitters velocity fields gives that extra undulated noise.

Or skip particles and go for TurbulenceFD:)

vector
02-17-2013, 10:28 PM
Turbulence is not budgeted sadly :(

MAybe I'm confused about that tutorial, it wouldn't be the first time. But I remember that effect and the emitters oscilating and emiting tons of particles. Maybe not exactly a cigarette but the effect was very similar. I'll try to find it again although your tips as always help a lot :)

prometheus
02-17-2013, 10:47 PM
Turbulence is not budgeted sadly :(

MAybe I'm confused about that tutorial, it wouldn't be the first time. But I remember that effect and the emitters oscilating and emiting tons of particles. Maybe not exactly a cigarette but the effect was very similar. I'll try to find it again although your tips as always help a lot :)

Understood, tons of particle? that only gives a hint on the weight ..not the amount:)

hereīs a scenefile you can experiment with, I deactivated ripple procedurals on the velocity vectors, I had that active on another setup that gave some cool twirls, but at the same time to uniform.
two winds...a disc is used to emitt particle, quite a few particles here, you can improve by set a particle age gradient on the size to be bigger at the end, and also dissolve at particle age.

we could use distance between particle gradient on dissolve/density channel here..so the density fades out and avoid blobs...but we are still waiting for that in lightwave.

also appriciated would be subframe calculation.

Check scenefile...lw 11.5 scene. should work in 11 too.
Michael

vector
03-07-2013, 10:08 PM
I have to retake this "problem". That scene is a great help.

By the way, the tutorial I watched was very similar to this video http://www.3dink.com/cig3.mov but the emitters were rotating. Anyway your effect is more elegant.

Vector