[vtkusers] Loading VTK is slower the first time.

[julien.barneoud at kodak.com]

Hi vtk users,

I am using the 4.4 release of VTK on a Windows OS. I have build an MFC 
application (C++) which 
- load a volume in a private file format, 
- then build a 3D pipeline (using volume rendering)
- then render it.
This application is able to load and display several volumes.

I have noticed that the first time I call vtkRenderWindow::Render 
function, the time to get the scene rendered is longer than ususal: it is 
about 30 seconds before the image is displayed. If I load a second volume 
dataset in the same instance of my application (even of a huger size), the 
time to get the image displayed is really faster. It is the same if the 
scene is rotated, pan or zoomed: the time to display is very short.

Is there any initialization done the first time VTK is called to display 
an image? In that case, is there any way to perform that initialization 
before performing rendering?

Thanks in advance for your answers, or any link to a previous known thread 
that deal with that (unfortunately, I did not found one which matches).

Regards,

Julien BARNEOUD
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