pcl_ROS 2D Segmentation

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Working with the ROS-PCL tutorials, specifically the euclidean cluster extraction, the goal is to cluster 3D objects. Does anyone in the community know of pcl_ros based 2D clustering software and some example implementations? I am trying to cluster input from a 2D SICK LIDAR into objects that I can then track from scan to scan. A problem I have come across, and the reason I ask this here, is that the dedicated pcl forums are dead.

Any help would be much appreciated!

JJB