Cloudcompare

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CloudCompare is a 3D point cloud and triangular mesh processing software. It was originally designed to perform comparison between two 3D points clouds such as the ones obtained with a laser scanner or between a point cloud and a triangular mesh. It relies on an octree structure that is highly optimized for this particular use-case. It was also meant to deal with huge point clouds typically more than 10 millions points, and up to 120 millions with 2 Gb of memory.

WWW http//www.cloudcompare.org/