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How to make a cloud of points from the CSV file?
If your file is a 3D scan of a building or other 3D structures, skip the following.
If your file is aerial lidar X,Y,Z and your goal is a TinSurface (and you're running v21 Pro Windows), you can download the free LidarTools for BricsCAD. Change the extension of your file to .XYZ then use it's LIDARCONV command to create a LAZ file, then use it's LIDARTIN command to create the TinSurface.