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  • Gas filling room

  • Grayson Earle

    May 5, 2009 at 7:59 pm

    I’m a new poster, been visiting here a bit, I love the site besides the annoying layout of the forum!

    I’m working on a student film and couldn’t get permission to use my smoke machine to give the effect that gas is filling a sort of prison cell. I want to do this in post, and I’m wondering how/if I can achieve a realistic effect in After Effects. Any help would be GREATLY APPRECIATED!
    Thank you in advance,

  • Justin Vaillancourt

    May 5, 2009 at 8:24 pm

    Trapcode Particular would be your best route, but if you don’t have it, you can get realistic results with CC Particle World.

    Change the particle type to ‘faded sphere’ change the colors to white, crank up the size and turn down the opacity to around 10-15%. Make sure the opacity map is fade in/fade out and lower the gravity and velocity.

    Play around with the settings enough and you should get something you’re happy with.


  • Grayson Earle

    May 5, 2009 at 11:24 pm


  • Todd Kopriva

    May 6, 2009 at 3:38 am

    I am not a fan of using particle effects to simulate fog/smoke/vapor when you can just composite some real footage of fog/smoke/vapor into you scene. It’s hard to make vapor simulated with a particle effect look realistic. Stock footage of smoke is pretty easy to get.

    Todd Kopriva, Adobe Systems Incorporated
    putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web

  • Simon Twine

    May 6, 2009 at 8:03 am

    The benefit of using particular would be the ability to make the smoke react to wind, the environment, get stuck to the roof etc…

    in all honesty, using BOTH real smoke elements and particle effects would be the best IMHO 😉

  • david bogie

    May 6, 2009 at 6:51 pm

    Particular is expensive.

    I’m with Todd, shoot it. Much more fun to pull out the pyrotechnics. We shot water-filled cloud tanks with white latex paint and aquariums filled with carbon dioxide and various evaporative or oxidizer side effects for many years before simulators came along. It wasn’t too difficult to place the aquarium and camera in roughly the same relationship as a the room into which the effect would be blended.

    Gave us a chance to visit the magician’s supply shop in downtown San Diego to get squibs, accelerants, smoke powders, sparkle powders, powdered brass, powdered aluminum, flash paper—all kinds of cool toys!


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