8.1.14. sphere collision
This exercise uses two forces to simulate compact sphere packing. One goal force causes all of the spheres to attract each other. Another goal force only activates when the centre points of two spheres are closer to each other than the sphere diameter and makes the centre points repulse each other heavily.
This exercise is using Grasshopper version 1.0.0007
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020