Virtual Sets are imaginary places where action takes place in the process of making a movie. The traditional way
of making a virtual set was to add a backdrop (called a matte painting) where the images of the set were
physically painted on. In modern filmmaking, the backdrop is added electronically from either a picture or a video
if the set requires motion. A chroma key backdrop (green or blue screen) is what is actually placed behind the live
action so that the electronics can key on the color in order to do the image replacement. Modern Virtual Sets are
designed with 3D modeling programs, are lit with virtual lights and recorded with virtual cameras. The live action,
on the other hand, must be lit with real lights and recorded with a real camera.
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