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Viewing frustum
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==Definitions== ;VPN: the view-plane normal β a [[Surface normal|normal]] to the view plane. ;VUV: the view-up vector β the vector on the view plane that indicates the upward direction. ;VRP: the viewing reference point β a point located on the view plane, and the origin of the VRC. ;PRP: the projection reference point β the point where the image is projected from, for parallel projection, the PRP is at infinity. ;VRC: the viewing-reference coordinate system. The geometry is defined by a [[field of view]] angle (in the 'y' direction), as well as an [[Aspect ratio (image)|aspect ratio]]. Further, a set of z-planes define the '''near and far bounds''' of the frustum. Together this information can be used to calculate a [[Projection matrix (computer graphics)|projection matrix]] for rendering [[Transformation matrix|transformation]] in a [[graphics pipeline]].
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