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The plane of projection is defined by a point on the plane (VRP), and the normal to the plane (VPN, coloured blue). We need another vector (Vup, coloured yellow) to orient the camera's coordinate system.
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The projection of Vup onto the plane of projection is the v vector. VPN, Vup, and v are all coplanar and perpendicular to u.
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| View volume using a perspective projection.
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| View volume using a parallel projection.
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| If we enable backface cull only faces where the normal points towards us are rendered.
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| An easy case for depth sort.
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| An impossible case for depth sort
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