Hi all, I wanna add letter in the middle of vtkCanvas. can anyone tell me how to set the position of vtkTextActor. Best Regards, El-Hassan Abdou Biomedical engineering -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20120619/f3acaf39/attachment.htm>