BNS method

[tissatussa]

since you're developing your engine, you may take a look at the BNS method i just found at lithander/Leorik#16 - it's not new (2011)
have a nice day !

[redactedontop]

As the author of the original PR of implementation (for the Leorik engine), I wanna add that my implementation is really bug. Don't try it.