Hi, I am displaying dicom file in vtkRenderWindow. I create 3D Lines using vtkLine and then create actor from vtkLine. Now my task is to trace the vtkLine and get all the points from where my vtkLine is passing in 3D. Thanks in Advance. -- Sent from: http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.html