just move the sliders to set the angles p to trace line green flag to stop all momentums press h to change 'h'. the lower h is the more accurate the simulation, with the trade off of loss of speed. h is usually 0.04, but on turbowarp, it goes to around 0.02.
https://en.wikipedia.org/wiki/Double_pendulum#Lagrangian https://en.wikipedia.org/wiki/Runge%E2%80%93Kutta_methods#The_Runge%E2%80%93Kutta_method https://turbowarp.org/1321156003?turbo&hqpen
