A springy mesh simulation, including wind simulation and rudimentary self-intersection. I wrote this in the fall of 2015 for a class, and have not updated it since. As such, it is very rough, has poor coding conventions, few comments, and perhaps bugs.
The simulation is composed of several simple springy meshes. A mesh consists of weights with springy edges between them. The springs behave according to Hooke's law and that's how they are defined, in terms of a stiffness with a dampening factor. All springs are initialized and stored in a state vector, which is integrated at each refresh. It is integrated using RK4 to prevent oscillation build-up and explosion. I use elapsed time rather than a fixed update rate, meaning the simulation is independant of framerate.
I have included several different scenarios, involving shapes, collisions, intersections, wind and other things. This is unfortunately hardcoded, so update the value on line main.cpp:77 for the different scenes.
The syntax I use compiles using clang, however I have found issues when compiling with g++. For an alternative, please see this springy mesh simulation I adapted to work in a Windows environment.
In adapting the simulation to work for my subdivision surfaces program, I found precisely what causes g++ to fail compilation where clang succeeds. Specifically, I use aggregate initialization hardcoded nearly everywhere in this project. When doing so, to initialize float types, g++ requires the literal be of a float type as well, (e.g. 0.0 vs 0.0f). It appears clang converts the literals upon compilation or otherwise does not complain. I do this everywhere in the project, this (along with many other qualities about this specific project) is bad coding practice. I wrote this a few years ago, I would never do this again.