Definitions
- VPN
- the view-plane normal – a normal to the view plane.
- VUV
- the view-up vector – the vector on the view plane that indicates the upward direction.
- VRP
- the viewing reference point – a point located on the view plane, and the origin of the VRC.
- PRP
- the projection reference point – 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. Further, a set of z-planes define the near and far bounds of the frustum.
Read more about this topic: Viewing Frustum
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