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gluProject

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hi all, here is my pb: i''m using the gluProject method in order to retreive the screen coordinate of an object in my 3D scene. I move the camera into the scene and for each event about camera moving i retreive the coordinates which are positive values if the object is in front of the camera but when it''s not, the coordinates pass to negative value. The pb is when my camera moves away from the object, the negative values pass to positive value and i''d like to avoid the cycle negative to positive. Do you understand what i mean? I know it''s quite difficult to explain my pb but if anybody can help me do it please!! thx

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