In Vista RC1 Viewport3D content becomes aliased when window is resized, even when I specified RenderingOptions.EdgeMode="Unspecified" in root Page object.
How can I make 3D scene always antialiased ?
What is your video card model and driver date, out of curiosity?
It's possible that resizing the window is causing your card to run out of video memory. When that happens, we'll disable AA.
My video card is ATI Radion X1600 XT with 256 MB video memory. Driver is from x64 5600 Vista build (installed automaticaly by Vista install). RAM is 2 GB.
Without window resizing content displayed with AA even when I launched several copies of application.
Screen resolution is 1280x1024x32bpp, processor is Pentium D.
When Viewpord3D content becomes aliased (after window resizing), Flip3D and other apps still displayed with AA. So, it is not seems out of video memory problem.
We have encountered spurious out of memory errors in this situation in the past, which triggers our code to disable 3d (though not 2d) anti-aliasing - it sounds like you're hitting this.
The best thing to try would be to update to the latest drivers from ATI and see if that fixes the issue for you (I believe they are at https://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&folderID=5712 ).
-Adam Smith [MS]
