[vtkusers] VTKLight

[jzhang63 at cs.mcgill.ca]

Hi everyone!

  I have a question about VtkLight.  When I add a VtkLight object to the
Renderer: ren->AddLight(light). And then I start the interactive:
iren->Start(). But the light direction will go back to the default one.
Can you help me with this? I don't want to the light direction to change
when interactive the scene with the mouse.

  Thank you very much and have a good night!

Best Regards,
Juan Zhang