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3D coordinate space

The Euclidian/Cartesian environment that defines three dimensions by X-, Y-, and Z-axes, and their corresponding coordinate values.

See also X-axis, Y-axis, and Z-axis.

3D matte

A color signal that is used to fill areas of keys and borders. Unlike a regular matte, a 3D matte has depth and is respected by all other 3D objects in the scene, letting you block out parts of a scene and replace it with video footage.