[vtkusers] OffScreen and blank window

[ABE Hiroshi]

Dear All,

I am working with an application with several VTK windows.

Only single VTK window is visible and the others are hidden. But it  
is necessary to render the hidden windows because the rendered images  
of the hidden windows are needed to be stored as images.

So I put the "OffScreenRenderingOn" to the hidden "vtkRenderWindow"s.

Actually the images are properly generated as expected.
My problem is that unexpected blank windows are pop-up-ed. I believe  
the blank window is popup-ed when the hidden renderwindow is "Render"ed.

Is there any way not to generate the blank window?

My Env. is:

PowerMac MDD 867MHz,
MacOS X 10.4.11
ATI Radeon 9600 256MB
VTK 5.4

Thank you in advance.

Regards,

ABE Hiroshi
  from Tokorozawa, JAPAN