I've concluded that I like the Inventor Mentor Book. I've used the book to teach open inventor to Senior University students. I worked with students to demonstrate a comprehensive set of programs viewable at WSU Virtual Worlds. WSU Virtual Worlds illustrates a more comprehensive code explaination. If you have questions on concepts in the book, email me. Heres what we were able to accomplish: Cylinder in trackball with Examiner Widget, Orthographic Camera and explainations of Perspective Camera, Space station w/ Camera and Point Light, Space station w/ Copper Material, Space station w/ Text, Grids (callbacks to OpenGL Code), applying Texture maps, B-Spline, using the Elapsed-Time Engine, Two Time Counters, Keyboard Events (this was very challenging to learn), Sensors, Draggers, nurb surface figure (cool technology), Walking Figure, skeleton and nurb surface skin (the best subject of the book: node kits), Examiner Widget, Water Molecule with Draggers and Timer Sensors.