I loved watching this video demonstration of a Takeo Igarashi from the University of Tokyo. In the demo he demonstrates a tool that can be used for creating 3D models by simple 2D strokes. More than being an awesome video it is also a fun tool to spend hours just doodling and seeing those doodles turning into great looking 3D models. It is a very easy to use tool and I had to deliberately pull myself away from it to make this blog post ;)
You have to check it out!
Ok, now I am off to playing with this tool. Let me also dump my quick thoughts about its relation to WPF. In WPF one should be able to create this tool using an InkCanvas and then overlaying a Viewport3D to view the 3D model. Interaction is the key and that is the most challenging part, in my opinion. The website has a link to a SIGGRAPH PDF…that may be the key!