maybe i've found the error...i take the polydata from a reader, but i make my vtkTransform on the actor offcourse...so how can i do? have you got any ideas? -- View this message in context: http://vtk.1045678.n5.nabble.com/assembly-and-vtkPLYWriter-tp5048992p5049431.html Sent from the VTK - Users mailing list archive at Nabble.com.