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Most efficient way to get frustum values?

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Hey, I need the smallest and largest x and z values from my frustum (between the near clipping plane I have set in my perspective view, and an arbitrary far clipping plane)... I was wondering what the most efficient way would be to get that data? Thanks

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You would unproject a window space coordinate to object space with gluUnproject.
The window coord, you can set to {x, y, 1.0} and another for {x, y, 0.0}

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