I have a similar problem to the one described here, although with
Windows Forms rather than WPF. Whenever my application renders a
tooltip which overlaps the OSG window, the tooltip gets cut off on the
next OSG frame. I've spent hours trying to find any information about
how to work around the problem, but have drawn a blank. This seems to
mainly be a problem on Windows XP; the systems with Vista I have tried
do not exhibit this problem. I can't speak to whether different
hardware/drivers have different behavior, though.
Peter
Brede Johansen wrote:
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 WPF.
Brede
On Wed, Mar 4, 2009 at 11:49 PM, Brian Stewart <[email protected]> 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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