Hi, When I run a while loop, the rendering window goes blank.. How can I refresh the vtkRenderWindow.. I'm already using Render() inside the loop but it doesn't work.. Thankyou, Majeed -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20060419/11a94aee/attachment.htm>