3d Vector force

hi,

This is a bit of a challenge, i have been thinking about and trying to do it for the past month.

Im trying to do a 3d line and vector forces shown in this link:

https://generativelandscapes.wordpress.com/2015/01/20/example-7-3-l...

i want to use a sphere instead of the circle and a box instead of the rectangle.

If you mange to do it please send me the .gh file and i will highly appreciate it

thanks!