Librerie AS3 ActionScript 3.0. In the previous article we implemented a particle constrained to a curve in two-dimensional space. We’ll expand on the concepts presented there and go through the process of creating modular constraints which can be easily interconnected. You’ll want to have some experience with 2D rigid body dynamics as we’ll be leaving behind the simplicity of particles for now. If “rigid body dynamics” sounds foreign to you, I recommend starting with the first 2 articles by Chris Hecker here . As a fun little introduction to what we’ll be solving, look at the multi-body simulation below. GreenSock.