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Perspective to Orthographic and vice-versa

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If I know field of view angle and current view volume co-ordinates defined by left_perspective, right_perspective, top_perspective, bottom_perspective, zNear, zFar. Then is it possible to some how find equivalent view volume in orthographic mode, that is left_ortho, right_ortho, top_ortho, bottom_ortho, zNear, zFar?

Is it possible to reverse it (to get perspective view volume if I know orthographic view volume and FOV angle?)

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