Here’s something you’ll want to check out…  Leslie Godwin has written some WPF extensions for the Newton Game Dynamics engine – the same physics engine I used in one of my first demos (the sweet one with the car).  Although the resulting moon lander demo is HARD (my landing gear kept snapping off), Leslie’s description of building it (including using Blender and exporting a model to XAML) is definitely worth reading; even more so if you’re into this stuff 🙂