[vtkusers] Second Try: Big performance hit when window gets too big

[Clinton Stimpson]

Have a look at Section 22.010 in
http://www.opengl.org/resources/faq/technical/performance.htm

Perhaps you are "fill limited"
It may be behavior specific to your video card/driver.

Clint

>----------------------------------------------------------------------
>
>Message: 1
>Date: Thu, 23 Sep 2004 14:47:05 -0600
>From: David Edwards <dedwards at msc.com>
>Subject: [vtkusers] Second Try: Big performance hit when window gets
>	too big
>To: vtkusers at vtk.org
>Message-ID: <41533649.402 at msc.com>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Hi,
>
>I really need to get an answer to this question, so I'm posting it again:
>I've got a VTK-heavy commercial program we're trying to get out the 
>door, but we've hit a show-stopper performance problem. When we open too 
>many windows (sometimes as few as 3), the performance slows to a crawl.
>
>I've simplified the problem in the following code. This makes 6 windows 
>with single renderers and displays them. That's all. No actors.
>* If you set SIZE to a small number like 100, you can grab and pan the 
>windows with no performance hit.
>* If you set SIZE to a larger number (for my system, it is 800), panning 
>any window is VERY slow.
>
>Since this is directly related to the window size, I'm wondering if the 
>video memory is filling up, causing page faults, but querying the video 
>memory (using direct draw) shows there's plenty of memory left.
>
>Many thanks in advance for your help on this pressing problem.
>
>- David Edwards
>Rigaku/MSC
>Orem Utah
>
>
>  
>