Kurt recently put out an overview on the V3.5 interactive 3D feature additions (UIElement3D types and Viewport2DVisual3D) which are available in the new WPF V3.5 Beta 2 . Give it a look!

I've seen that the Airspace regions constraints have been a concern for some folks interested in using DirectX with their WPF applications. Based on this, here is a follow-up to an earlier sample I posted, this time using Layered windows to intercept...