1. Reference for spring, lasso, and lights in Toy Story: Barzel, R. Faking the dynamics of ropes and strings, IEEE Computer Graphics and Applications, May - June 1997, 31 - 41. 2. urls for floating point issues in Java http://math.nist.gov/javanumerics www.javagrande.org 3. For perspective views and camera control, some students have found lighthouse3d.com to be a valualbe source of help (I have not used this myself.)