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View Full Version : Model for Greenscreening??



Johnny
02-15-2004, 02:56 PM
Last week a friend send me a link to an ad somebody placed to have a model of a room made...they needed a wireframe for future greenscreening.

to me, it sounds like they're going to shoot the actual actors and acting, then composite those actors inside of a CG Room..

How's this done? if the "real" camera moves this way and that, how do you tell Lightwave's camera to follow that motion? To zoom, or pull back, etc.

Is this accomplished by truly expensive software and a special camera with X Y and Z sensors?

J

prospector
02-15-2004, 07:17 PM
It can be done on the real cheep

A 50 ft. tapemeasure, a 12 in ruler, a notepad.
All you need is a few measurements

1 camera height from floor
2 distance from camera to wall
3 distance of an object in background from floor up


make a scale drawing of studio

then just a matter of some math to get the angles of the background, and it will give you the placement of the camera.

Not hard math, just angles.
With those three measurments you can triangulate.
The better the measurements in beginning, the better camera results.