Ooh, how hard would it be to do a compound pendulum, or a pendulum on a spring free to move in 3D?

#iteachphysics I attempted to implement the equations of motion for a compound (equal length and mass) pendulum from wikipedia into this 3D Desmos simulation. You set the range of release angles and number of pendula. The path of the first and last pendula are plotted. www.desmos.com/3d/70e585e2c7

Double Pendula F