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4.14 Projection

Function: glu-pick-matrix x y w h vp
Function: glu-project objx objy objz model-mat proj-mat vp
Function: glu-un-project winx winy winz model-mat proj-mat vp
Function: glu-project! win obj model-mat proj-mat vp
Function: glu-un-project! obj win model-map proj-mat vp

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