Got rid of timer that was causing performance problems on the Mac by looking for the "StartEvent" on the RenderWindow to determine when we are about to do a vtk render.
Got rid of timer that was causing performance problems on the Mac by
looking for the "StartEvent" on the RenderWindow to determine when we
are about to do a vtk render.


tommy-u/enable,tommy-u/enable,tommy-u/enable,tommy-u/enable