OpenCV vs PCL

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I am working on segmentation in 3d scenes and I was wondering if the KDTree algorithm in opencv provides the same clustering functionality as the one from PCL ? Can it region grow and can I add my own similarity functions ? Are there any other good region growing algorithms in opencv without manual initialization ?

http://docs.opencv.org/3.1.0/df/d36/c... http://pointclouds.org/documentation/...