在Unity中使用未分配的局部变量

Question

这是我控制镜头移动的脚本.. 但是我得到了错误：

  

错误CS0165：使用未分配的局部变量`floorHit'

我该如何解决？

void Start(){
    floor = LayerMask.GetMask ("Floor");
    Ray RAY = Camera.main.ScreenPointToRay (Input.mousePosition);
    RaycastHit floorHit;
    Vector3 playerMouse = floorHit.point - transform.position;
    playerMouse.y = 0f;
    MoveTo (playerMouse.x, playerMouse.z);
}

Answer 1

需要通过添加线

来设置光线的值

if (Physics.Raycast (ray, out floorHit)) {
    //add logic here for what to do if we hit
    }

宣布之后。

所以完整的例子是

void Start(){
    floor = LayerMask.GetMask ("Floor");
    Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
    RaycastHit floorHit;
    if (Physics.Raycast (ray, out floorHit)) {
        Vector3 playerMouse = floorHit.point - transform.position;
        playerMouse.y = 0f;
        MoveTo (playerMouse.x, playerMouse.z);
    }
}

Answer 2

您需要RaycastHit - 类的新实例：

RaycastHit floorHit = new RaycastHit();
Vector3 playerMouse = floorHit.point - transform.position;

Answer 3

您需要实例化floorhit：

RaycastHit floorHit = new RaycastHit();