On Wed, 2003-09-10 at 16:22, Charl P. Botha wrote: > aTuple = tuple(a) > vtk.vtkMath.Normalize(aTuple) Err, of course I meant: aList = list(a) vtk.vtkMath.Normalize(aList) Do as I say, not as I do, I guess. :) -- charl p. botha http://cpbotha.net/ http://visualisation.tudelft.nl/