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4/8/2010
The world transformation changes coordinates from model space, where vertices are defined relative to a model's local origin, to world space, where vertices are defined relative to an origin common to all the objects in a scene. In essence, the world transformation places a model into the world; hence its name. The following illustration shows the relationship between the world coordinate system and a model's local coordinate system.
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The world transformation can include any combination of translations, rotations, scalings, and shears.