Hello, you can try with vtkBooleanOperationPolyDataFilter Difference, if your polydatas are ok with it. -- View this message in context: http://vtk.1045678.n5.nabble.com/Subtracting-one-vtkPolyData-from-another-one-tp5725565p5725569.html Sent from the VTK - Users mailing list archive at Nabble.com.