Question: There are several co-ordinate parameters for 3D viewing such as viewing origin (or camera position) P0, reference point (or look-at point) Pref, viewing direction N,

There are several co-ordinate parameters for 3D viewing such as viewing origin (or camera position) P0, reference point (or look-at point) Pref, viewing direction N, and viewing coordinate system (as shown below). Describe how the viewing co-ordinate system can be defined. Diagrams can be used in your answer where necessary. [6 marks]
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