unity, 忽略碰撞

一，layer之间忽略碰撞。

Edit->Project Settings->Physics->Layer Collision Matrix

二，collider之间忽略碰撞。

void Physics.IgnoreCollision(Collider collider1, Collider collider2, bool ignore = true);

参考：http://game.ceeger.com/Script/Physics/Physics.IgnoreCollision.html