Viewing History

Explanation of Peculiarities

Sometimes people ask "Why have multiple coordinate systems?"(x,y,z and u,v,n)
Answer: Often want to see objects from multiple points of view. Need to rotate around center of object, not of x,y,z world coordinate system.
Adjusting the COP is hard (and making consequent adjustments in all other parameters is harder!)
But rotating the coordinate system is easy.
Because COP (or DOP) is defined in coordinates, as are the front and back clipping planes, and the window on the view plane...
Rotating rotates the entire view about the VRP. If the VRP is near the center of the window, hence near the object of interest, this is convenient.

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