View Full Version : how do I integrate 3D w/live action

03 March 2005, 06:37 PM
what is the process of integrating the two mediums of 3D and Live action. I am looking to create a natural disaster film with tornados. What is the compositing process?

03 March 2005, 10:38 PM
that really depends on a shot per shot basis. If the shot doesn't have a moving camera then the process is much easier. If the camera is moving, then someone must track the footage with software to re-create the movement of real camera so that your 3d package will have a virtual one that matches up to your live footage. Then you just tweak the render to match the color's of the footage. This is done with a compositing programs like After effects, Apple's Shake, Discreet combustion.. ect

The workflow usually goes something like this

previsual/storyboard > shoot footage > (track if necessary) > create the 3d content (in your case tornado's) > render > color correct

hope this helps :)

04 April 2005, 04:22 PM
Usually, 3d integration in real plates is limited to shadow casting on the real scene, something that involves the process already explained in the former post, but your case might prove still harder as a tornado won´t only cast shadows around, usually will try hard to blow away everything it gets in its path. You might need to build extra 3d buildings to be blown away by using some kind of partycle and physics interaction between 3d objects, and then integrate those in the real plate. You are also going to need heavy use of matte painting to "destroy" the real buildings in the plate, unless you choose to make all buildings 3d.

Unless your tornado sightings will only happen in the countryside and far away from camera, which will make things a bit simpler.

For matte painting techniques check:


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04 April 2005, 04:22 PM
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