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INSANE is a proprietary INteractive Streaming ANimation Engine developed at LucasArts, primarily by programmer/game designer Vincent Lee. It greatly compresses moving images so that high quality full-screen videos can be displayed even in hi-res graphics modes on the PC.
It was first used in Star Wars: Rebel Assault II - The Hidden Empire and then in Full Throttle and The Dig. It was also used in the 1998 games Star Wars: Droid Works and Mysteries of the Sith. The use for Full Throttle caused some problems since INSANE was intended to be photorealistic, contrasting to the general cartoony feeling. The rendered environment had to be scaled down to match to the rest of the game world.