UNITY中判断两个点之间距离的方法

Vector3.SqrMagnitude与Vector3.Distance

二者的差别在于括号里调用参数方法的不同

另一个区别是，SqrMagnitude比Distance的开销要小。

以下是两种方法的具体实例：

                    if (Vector3.SqrMagnitude(guardPos - transform.position)<=agent.stoppingDistance)
                    {
                        isWalk = false;
                        transform.rotation = Quaternion.Lerp(transform.rotation,guardRotation,0.01f);
                    }

 if(Vector3.Distance(wayPoint,transform.position)<=agent.stoppingDistance)
                {
                    isWalk = false;
                    if (remainLookTime > 0)
                    {
                        remainLookTime -= Time.deltaTime;
                    }
                    else
                    {
                        GetNewWayPoint();
                    }
                        
                   
                }