Where can I get hold of the details of how Phun works?
In Emil’s thesis, when he has finished writing it! Phun is based on a 2D physics engine that solves for constraint forces. A constraint is a physical/mathematical condition that makes sure that a hinge holds together or that two contacting bodies do not penetrate. The solver in Phun solves a large linearized system of equations using an iterative method, computes the required constraint forces and updates the velocities with these forces, and finally also computes new positions and orientations. The method for computing the constraint forces is based on SPOOK, from the work of Claude Lacoursière in his PhD thesis, Ghosts and machines: regularized variational methods for interactive simulations of multibodies with dry frictional contacts, Dept. of Computing Science, Umeå university, 2007. The resulting time stepper is closely related to the Leapfrog integration scheme. The fluid simulations in Phun are based on a method called Smoothed Particle Hydrodynamics (SPH). SPH is a particle bas
