Projection Perspective
The Perspective projection takes the world space coordinates and divides the X and Y coordinates by the Z coordinate. This means that the texture map applies linear perspective across the surface. The most common use of the Perspective projection is camera mapping.
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Perspective Projection
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Figure 1: Octane VOP Network example
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Perspective Projection
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Figure 2: Perspetive projection with World Space selected as the Coordinate Space to produce a camera-mapped result