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An orthographic projection is better described as a kind of parallel projection, because if you were to draw lines between the points in "world space" (ie 3d) to "projected space" (ie 2d) they would be parallel to each other. All projections map one space to another, though for the most part when we're talking about orthographic projections we're ...


2

I don't believe your second link's analysis works for a projection matrix FoV. In that link, the angle of the field of view is centered on the middle of the lens. The 'camera' with a perspective matrix is actually located behind the near plane. So the distance between the near plane and the far plane being used as one component of the atan calculation will ...



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