Subsamples a point cloud (i.e. decreases the number of points).Several subsampling methods are available (random, spatial and octree-based). Notes: for each input cloud, a new subsampled cloud is created (the original one is simply deactivated) a subsampled cloud is a subset of the input cloud (the original points are not displaced) thanks to this, a subsampled cloud keeps the features of its source cloud (scalar fields, colors, normals, etc.)ProcedureSelect one or several clouds then launch the tool.