Golang quadtree implementation
- https://www.reddit.com/r/Unity3D/comments/p6vnyk/comment/h9ftli7/?utm_source=share&utm_medium=web2x&context=3
- https://grail.cs.washington.edu/projects/crowd-flows/continuum-crowds.pdf
- https://leifnode.com/2013/12/flow-field-pathfinding/
- https://gamedev.stackexchange.com/questions/81593/a-star-pathfinding-and-discrete-smooth-positions
- https://grail.cs.washington.edu/projects/crowd-flows/