[vtkusers] proper fullscreen mode under X

[Glen.Coates at csiro.au]

Hi,

I'm trying to wring more performance out of my VTK app by using fullscreen 
mode under X.  My desktop runs at 1280x1024, but I'd like to run my app at 
something like 640x480.  Doing a ->SetSize(640,480) on my RenderWindow 
doesn't do an X mode change (with the flickering and everything), it just 
creates a 640x480 window in the top left of the screen, with all the 
desktop apps still running in the remainder of the screen.

How do you get the "true" fullscreen mode under X where performance 
actually increases?

-- 
Cheers,
Glen