Unity 位置计算

Unity 位置计算

问题：获取某个位置的坐标在前方（或后方）一定距离的方法

public Vector3 GetPosition(Quaternion rotation, Vector3 position, float distance) 
{ 
    Vector3 direction = rotation * Vector3.forward; 
    return position + (direction * distance); 
} 

Unity3D是如何计算 forward的

public Vector3 forward 
{ 
    get 
    { 
     return this.rotation * Vector3.forward; 
    } 
    set 
    { 
     this.rotation = Quaternion.LookRotation(value); 
    } 
} 

Ray结构及其GetPoint函数用于通过提供起始点，方向和距离来计算未知距离找到

Vector3 startingPostion = new Vector3(4, 6, 2); 
Quaternion theDirection = Quaternion.identity; 

Ray ray = new Ray(); 
//Set the starting point 
ray.origin = startingPostion; 
//Set the direction 
ray.direction = Vector3.forward + theDirection.eulerAngles; 

//Get the distance 
ray.GetPoint(100); 

或者

Ray ray = new Ray(startingPostion, worldRotation * Vector3.forward); 
//Get the distance 
ray.GetPoint(100); 

参考链接：https://www.pianshen.com/article/3402173540/