[vtkusers] multiple renderers performance

[Nicolae Mihalache]

Hello!

I'm new to vtk and I'm tring to improve the performance of some 
application :(
I'm using vtk 3.2 + tcl and the performance problems I observe are 
related with having multiple renderers each with its own window.
In short, what the program does is set some camera parameters and then 
call "renderX Render" where X is 1,2 or 3. If I call this function many 
times for the same renderer, the call takes about 0.07 seconds. But each 
time the renderer is changed, the call takes almost 3 seconds :(
I tried to run this part of the application in vtk 4.0 but the 
performance seems to be the same.
Any ideea how to improve it? Is it a limitation of the opengl 
implementation or vtk? I use a nvidia card on linux with nvidia drivers.

The two renderers render in fact the same scene with the same actors but 
from different angles.
Other ways to implement it?

Thanks,
Nicolae Mihalache