场景多enemies集群（扎堆“挤在一起”）问题 steer

  http://kidscancode.org/godot_recipes/3.x/ai/context_map/

https://www.ggdesign.me/goodreads/context-based-steering-3

https://indienova.com/indie-game-development/vo-rvo-orca/

var ray_directions = []
var interest = []
var danger = [] //1.用ray查询确定 2.并且根据distance进行[0,1]细分。 3.考虑到enemy爬坡， ray后的hit noraml.y确保y>0


我们是直接用权重最大的值作为下一帧的dir