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Making an explosion, smoke stay put while camera moves

Posted: Fri, 14th May 2010, 9:40pm

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director1331

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How do I have an explosion put in one place while I have the camera roaming freely. It seems the only way I can make it stay is if the camera is on a tripod.
Posted: Fri, 14th May 2010, 9:53pm

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Garrison

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Unless you have software program that can do tracking AND have something trackable in the shot, it will be difficult to have and effect "stay in place" as the camera moves. Locked shots or practical effects are the way to go if you don't have tracking capabilities.

Knowing your limitations in production an post production helps you to adjust how you shoot a scene. You could rotoscope the effect, but it's time consuming and almost never looks that great. Of course, that does depend on how much the camera moves.
Posted: Fri, 14th May 2010, 9:57pm

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director1331

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I have Sony Vegas and Effectslab Pro. Could I do it from one of those two?
Posted: Fri, 14th May 2010, 10:03pm

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Sollthar

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Not even remotely, no.
Posted: Sat, 15th May 2010, 12:14am

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spydurhank

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You can try this.

http://vimeo.com/6352007
Posted: Sat, 15th May 2010, 2:37am

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alienux

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About the only option you have, other than re-shooting the footage without movement, is to animate the origin point frame by frame. Depending on how much your shot moves, this could be more time consuming than its worth.

I actually had to do this on a movie I made where one particular scene with fire was filmed without a tri-pod. It took awhile, but the camera movement wasn't terribly bad, so it turned out really well, but if the camera movement is more than a little shaky and/or the scene is very long, it may not be worth doing it this way and you may just be better off re-shooting the footage.
Posted: Thu, 20th May 2010, 8:49pm

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Mow Mow

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I'm not sure how helpful this is but i just shoot the footage from different angles on a tripod, then edit the film and put the effects you want, (in this case the smoke) and render that out, then create a preset to load every few seconds that moves the footage around like someone is holding the camera. I record it in HD then i can do zooms in it and all that and after all the movement and zooms i export it in regular DVD, or 720 by 480 or whatever you prefer.

I did this when i had to film for my own fun music video, heres the link, (all but one shot done on a tripod).

http://www.youtube.com/watch?v=cFQTh52IsvM

A good example of this technique is the Battlestar Galactica preset supplied in the initial preset download of the composit/effectslab program.

Hope this helps, you see i am not good at explaining things:)
Posted: Fri, 21st May 2010, 6:17am

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JUIDAR

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Sigh if only VisionLab could do motion tracking...