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Bitmap mouse selection in OpenGL

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Hi all, Bit of a novice question here I''m afraid. I have a strip of bitmaps rendered to the screen (thumbnail style) in OpenGL. I need to allow the user to select these by mouse clicking. How do I do this? please if you could direct me to a tut or give help it would be greatly appreciated. I have tried Jeff''s selection technique on Nehe but that is for primitive and does not work on BMP''s. Thanks guys Paul

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