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OpenGL help on strange thing on OpenGL pickObject method

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Hi there, I have a problem in selecting object. every time, when I try to select object within a give region, there always one more object been select which is outside of the region that I defined to pick. here is my picture : as you can see, the big red circle is my desired selection, but every time, an extra region is selected( the small red circle region). here is another picture: If anyone can help? thanks a lot!

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