[vtkusers] vtkqt pipeline update

[Hari Sundar]

Hi,

I am trying to build a simple application using vtk and qt and am using
the vtkqt widget.

Everything works reasonable. I however am not able to update the pipeline
if I make any modifications, i.e., if I add/remove actors or change
properties.

Anyone have any idea on how that is to be done using vtkqt ?

thanks,
-Hari