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zoom con opengl

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i have done pan and zoom with drag&drop, i wanted to do a zoom defining 4 vertices on the screen... 1) when i click the mouse and i make a cross on the screen(1st vertex) the cross isn't where i have clikked because of the glprojection 2) when i have defined all the vertex (2 in diagonal) how can i show only the portion of the screen in the defined window? 3) can i make a selection showing a semitransparent square window-like? thanks ;-)

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