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Mean-Shift a non-parameter algorithm, is widely used in real-time tracking. A crucial problem in implementing this algorithm is that there is presently no clear mechanism for updating the tracking window when a variable-size object is tracked. To solve this problem, we have proposed a 2D window updating algorithm based on projective geometry in the previous research.But on certain occasions, such as car tracking, a 3D window can describe the object more accurately than a 2D window. So we extend our algorithm into a 3D tracking, and the experiment shows that this algorithm performs well.