[osg-users] WPF and OpenGL popup window problem

Brede Johansen bredej at gmail.com
Thu Mar 5 00:36:48 PST 2009

Hi Brian,

What you describe sounds like the WPF airspace limitation described here
http://msdn.microsoft.com/en-us/library/aa970688.aspx.  The short version is
that each pixel can only belong to one render technology (WPF, DirectX,
Win32 OpenGL).
A workaround is to render your OSG scene off screen and give the bitmap to


On Wed, Mar 4, 2009 at 11:49 PM, Brian Stewart <osgforum at tevs.eu> wrote:

> Hi,
> I have developed an application where I have an OSG window embedded in a
> windows application built with WPF. On certain Geforce cards there seems to
> be a bug where WPF popup windows (like menus) that have AllowTransparency
> set to true do not draw correctly over my OSG window. Basically whenever the
> OSG/OpenGL window updates, it overwrites all overlapping pixels, even if the
> popup is higher in the window manager's Z-order. I have isolated it to an
> issue with the OpenGL driver. It only occurs on Geforce cards, not Quadro
> cards (which is not surprising, since I've read the Geforce cards were
> optimized for DirectX). I'm not so much looking for a fix (though one would
> be welcome) - I'm just wondering if anyone else has encountered this. I have
> already filed a bug report with nvidia, and it might help if I could report
> that others are having issues with it too (or maybe I really am the only
> person out there foolish enough to try this). If anyone is interested, I can
> supply a small
>  test project that uses WPF and OpenGL together to demonstrate the problem.
> Thanks!
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=7967#7967
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