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Important Points for Windowing Transformations
1. Window explains what is to be viewed and viewpoint describes where it is to be displayed.
2. Frequently window and viewpoints are rectangles in standard position along with edges parallel to coordinate axes. Generalized shapes like polygon and so on, take long to process; hence we are not considering these cases where viewport or window can have common polygon shape or circular shape.
There are several kinds of dedicated Video Tele Conference devices. Large groups Video Tele Conference are non-portable, large, more expensive devices utilized for large rooms
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