Simulate a trebuchet.This program uses a physically based model to represent a trebuchet. When my son and I were watching Lord of the Rings, we noticed that Minas Tirith used trebuchets to defend itself. We built one out of lego, but optimizing lego is tedious, so I made this virtual trebuchet in order to try different designs. The trebuchet can also "learn" to move more efficiently by a process of automated optimization. It uses exactly the optimization code I use for improving the performance of the game programs. This is still a work in progress. I need to use constrained dynamics for the projectile's attachement to the sling (instead of a simple spring based restorative force which leads to instability). When done, I hope to build a trebuchet with my son according to the optimized specifications.