CloudCompare is a 3D point cloud (and triangular mesh) processing software. It has been originally designed to perform comparison between 3D points clouds only. It relies on a specific octree structure that enables great performances(1) relatively to this particular function. As point clouds were acquired by high data rate 3D laser scanners, CloudCompare was also meant to deal with huge point clouds (typically more than 10 millions points) on standard laptops. Rapidly, comparisonbetween a point cloud and a triangular mesh has been included (see below). Afterwards, many algorithms for point cloud processing have been integrated (registration, resampling, color/normal/scalar fields management, statistics computation, sensor management, interactive or automatic segmentation, etc.) as well as display enhancement tools (customizable color ramps, color & normal vectors handling, calibrated pictures handling, OpenGL advanced shaders and other plugins).