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Viewing Transformations
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Viewing transformations change the position
and orientation of the viewpoint
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Analogous to "moving the camera"
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Ways to implement vieing transformations:
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Use one or more modeling tranformations
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Moving objects around a stationary camera
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Moving the camera around the world (equivalent)
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Use the Utility Libary routine gluLookAt() to define a line-of-sight
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Roll your own routine (cosine matrix, HPR, etc)
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