Mathematics of Projections

Specifying the View Volume via the Window

Need to specify what we will be looking at
Since we're making a rectangular image, we'll be using a rectangular cone in space
We could specify this cone by giving "field of view" angles, and some systems allow this
More commonly, we specify a cross section of the view volume: slice of the cone by view plane
Slice is rectangle. If we specify rectangle, we have defined the cone. To specify rectangle requires a coordinate system on view plane

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