掃射目標時如何讓特工面對行進方向？ （統一/C#）

Question

我正在 Unity 中開發一個 FPS 游戲，我希望有一個代理（動畫蝙蝠）在目標周圍掃射。 一切正常，但是蝙蝠在圍繞目標掃射時面向固定方向，而不是面向行進方向。 我嘗試按照下面列出的代碼添加四元數旋轉（請參閱“面向正確方向”），但無濟於事。 我已經注釋掉了代碼部分，看看我是否可以確定問題所在，但這只會導致更多問題。 任何幫助將不勝感激。

代碼...

// Target position. The gameobject will circle around this position.
[SerializeField]
private Vector3 TargetPosition = new Vector3();

// Temp Position. Used to generate a new position on the circle.
private Vector3 tempPosition = new Vector3();

// Radius. Generated from the game objects current distance to the target.
float r;

// The current angle in the circle strafe.
float theta;

/// movement variables
private Vector3 currentTargetPos; 

// Start is called before the first frame update
void Start()
{
    // Get the radius. The distance to the target position.
    r = Vector3.Distance(transform.position, TargetPosition);

    // Default theta.
    theta = Mathf.Acos((transform.position.x - TargetPosition.x) / r);

    // Check quadrant and adjust.
    if ((transform.position.x - TargetPosition.x) > 0 &&
                        (transform.position.y - TargetPosition.y) > 0)
    {
        Debug.Log("Quadrant 1");
    }
    if ((transform.position.x - TargetPosition.x) < 0 &&
    (transform.position.y - TargetPosition.y) > 0)
    {
        Debug.Log("Quadrant 2");
    }
    if ((transform.position.x - TargetPosition.x) < 0 &&
                        (transform.position.y - TargetPosition.y) < 0)
    {
        Debug.Log("Quadrant 3");
        theta = -theta;
    }
    if ((transform.position.x - TargetPosition.x) > 0 &&
                        (transform.position.y - TargetPosition.y) < 0)
    {
        Debug.Log("Quadrant 4");
        theta = -theta;
    }
    Debug.Log("theta x = " + theta);
}
// Update is called once per frame
void Update()
{
    // Get the actors circle strafe location.
    tempPosition.x = TargetPosition.x + r * Mathf.Cos(theta);
    tempPosition.z = TargetPosition.z + r * Mathf.Sin(theta);
    tempPosition.y = transform.position.y;

    // Update t.
    theta += 0.2f * Time.deltaTime;

    // Set the location.
    transform.position = tempPosition;

    // clear y to avoid up/down movement
    currentTargetPos.y = transform.position.y; 

    Vector3 direction = currentTargetPos - transform.position;

    // face in the right direction
    direction.y = 0;
    Quaternion rotation = Quaternion.LookRotation(-direction, Vector3.up);
    transform.rotation = rotation;
}

// Draws debug objects in the editor and during editor play (if option set).
void OnDrawGizmos()
{
    // Draw target position.
    Gizmos.color = Color.red;
    Gizmos.DrawSphere(TargetPosition, 0.2f);
}

}

Answer 1

Unity 有一個內置的 function 用於名為LookAt()的變換，它采用Transform other或Vector3 worldPosition作為參數。 要實現它，您可以編寫transform.LookAt(TargetPosition) 。

請注意，這可能會影響依賴於本地旋轉的翻譯，因此如果您遇到問題，您還需要更改一些邏輯。 為了避免這種情況，您可能希望在移動之前重置旋轉，然后將旋轉移回需要的位置，或者使用世界空間而不是局部空間更好。