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...
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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