something like this, I want to extract the polydata from the raw file and get the center position of the 3 small spheres. <http://vtk.1045678.n5.nabble.com/file/n5721912/raw.png> -- View this message in context: http://vtk.1045678.n5.nabble.com/RAW-file-tp5721842p5721912.html Sent from the VTK - Users mailing list archive at Nabble.com.