Interactive Double Pendulum Playground

Nice interactive build! Double pendulums are deceptively tricky in real-time — the numerical integration method determines whether your simulation blows up or stays stable, especially with larger time steps.

In my own experience, switching from simple Euler integration to a more stable RK4 or symplectic integrator makes a big difference in both visual stability and control responsiveness without killing performance.

Curious — what integration method and step size are you using under the hood, and how do you balance simulation fidelity vs rendering performance (e.g., throttling steps per frame vs smoothing)? That’s usually the core trade-off in interactive physics UIs.