https://www.3dbuzz.com/training/view/unity-fundamentals/physics/12-character-joint
http://www.viewzone.com/onstott33.html
http://catlikecoding.com/unity/tutorials/hex-map-1/
- Add water to cells.
- Triangulate a water surface.
- Create shore water with foam.
- Make water and rivers play nice.
http://www.ultimategametools.com/products/rope_editor