Unity：使用鼠标位置为我的相机生成角度以围绕对象旋转

Question

我正在尝试制作面向鼠标的 3d Agar.io。现在，我正在研究基本的运动和相机调整。我希望相机能够围绕一个物体旋转，但这里有一个问题：我只想使用鼠标移动物体和相机，并旋转相机。但是，我能够使用两次距离公式和余弦定律来配置此逻辑。我基于原点 (0, 0)。我确信我所做的过程没有任何问题；但是，我知道它的输出方式是错误的。

每次你向左或向右移动鼠标时，我希望相机在之后立即旋转。我尝试使用 FixedUpdate 和 LateUpdate 事件来尝试实现这一点，但都没有成功。我尝试使用的相机旋转代码是这样的：

void LateUpdate ()
{
    // Move Camera
    transform.position = new Vector3(camX, 10.5f, camZ);

    //Rotate Camera
    //transform.eulerAngles = getRotation;
    //transform.eulerAngles = Vector3.MoveTowards(currentRotation, getRotation, speed * Time.deltaTime);
}

我拥有的完整代码（已更新）：

public class CameraController : MonoBehaviour {

    public float speed;
    public GameObject player;

    private Ray ray;
    private RaycastHit hit;
    private Vector3 mousePos;

    private float camX;
    private float camZ;

    private float getA;
    private float getB;
    private float getC;

    private float getAngle;
    private Vector3 currentRotation;
    private Vector3 getRotation;

    void Start ()
    {
    }

    void FixedUpdate()
    {

    }
    void LateUpdate ()
    {
        if (PlayerController.movedPlayer)
        {
            if (Physics.Raycast(ray, out hit))
            {
                mousePos = new Vector3(hit.point.x, 1.3f, hit.point.z);
            }

            // MouseZ
            if (mousePos.z >= player.transform.position.z)
            {
                // Camera Follow Z+
                if ((player.transform.position.z >= 0 && player.transform.position.x >= 0) &&
                    player.transform.position.z >= player.transform.position.x)
                {
                    camZ = player.transform.position.z - 10;
                    camX = 0;
                }
                else if ((player.transform.position.z >= 0 && player.transform.position.x < 0) &&
                    player.transform.position.z >= -player.transform.position.x)
                {
                    camZ = player.transform.position.z - 10;
                    camX = 0;
                }
                else if ((player.transform.position.z >= 0 && player.transform.position.x >= 0) &&
                    player.transform.position.z < player.transform.position.x)
                {
                    camX = player.transform.position.x - 10;
                    camZ = 0;
                }
                else if ((player.transform.position.z >= 0 && player.transform.position.x < 0) &&
                    player.transform.position.z < -player.transform.position.x)
                {
                    camX = player.transform.position.x + 10;
                    camZ = 0;
                }

                // Camera Follow Z-
                if ((player.transform.position.z < 0 && player.transform.position.x >= 0) &&
                -player.transform.position.z >= player.transform.position.x)
                {
                    camZ = player.transform.position.z + 10;
                    camX = 0;
                }
                else if ((player.transform.position.z < 0 && player.transform.position.x < 0) &&
                    -player.transform.position.z >= -player.transform.position.x)
                {
                    camZ = player.transform.position.z + 10;
                    camX = 0;
                }
                else if ((player.transform.position.z < 0 && player.transform.position.x >= 0) &&
                    -player.transform.position.z < player.transform.position.x)
                {
                    camX = player.transform.position.x - 10;
                    camZ = 0;
                }
                else if ((player.transform.position.z < 0 && player.transform.position.x < 0) &&
                    -player.transform.position.z < -player.transform.position.x)
                {
                    camX = player.transform.position.x + 10;
                    camZ = 0;
                }
            }
            //PlayerZ
            else if (mousePos.z < player.transform.position.z)
            {
                // Camera Follow Z+
                if ((player.transform.position.z >= 0 && player.transform.position.x >= 0) &&
                    player.transform.position.z >= player.transform.position.x)
                {
                    camZ = player.transform.position.z + 10;
                    camX = 0;
                }
                else if ((player.transform.position.z >= 0 && player.transform.position.x < 0) &&
                    player.transform.position.z >= -player.transform.position.x)
                {
                    camZ = player.transform.position.z + 10;
                    camX = 0;
                }
                else if ((player.transform.position.z >= 0 && player.transform.position.x >= 0) &&
                    player.transform.position.z < player.transform.position.x)
                {
                    camX = player.transform.position.x + 10;
                    camZ = 0;
                }
                else if ((player.transform.position.z >= 0 && player.transform.position.x < 0) &&
                    player.transform.position.z < -player.transform.position.x)
                {
                    camX = player.transform.position.x - 10;
                    camZ = 0;
                }

                // Camera Follow Z-
                if ((player.transform.position.z < 0 && player.transform.position.x >= 0) &&
                -player.transform.position.z >= player.transform.position.x)
                {
                    camZ = player.transform.position.z - 10;
                    camX = 0;
                }
                else if ((player.transform.position.z < 0 && player.transform.position.x < 0) &&
                    -player.transform.position.z >= -player.transform.position.x)
                {
                    camZ = player.transform.position.z - 10;
                    camX = 0;
                }
                else if ((player.transform.position.z < 0 && player.transform.position.x >= 0) &&
                    -player.transform.position.z < player.transform.position.x)
                {
                    camX = player.transform.position.x + 10;
                    camZ = 0;
                }
                else if ((player.transform.position.z < 0 && player.transform.position.x < 0) &&
                    -player.transform.position.z < -player.transform.position.x)
                {
                    camX = player.transform.position.x - 10;
                    camZ = 0;
                }
            }

            // Make Triangle
            getA = mousePos.x - player.transform.position.x;
            getB = mousePos.z - player.transform.position.z;
            getC = Mathf.Sqrt(Mathf.Pow((getA), 2) + Mathf.Pow((getB), 2));

            // Get Rotating Angle.
            if (getA == 0 && getB >= 0)
            {
                getAngle = 0;
            }
            else if (getA == 0 && getB < 0)
            {
                getAngle = 180;
            }
            else if (getB == 0 && getA >= 0)
            {
                getAngle = 90;
            }
            else if (getB == 0 && getA < 0)
            {
                getAngle = 270;
            }
            else
            {
                if (getA > 0)
                {
                    getAngle = Mathf.Acos((Mathf.Pow((getB), 2) + Mathf.Pow((getC), 2) - Mathf.Pow((getA), 2)) /
                        (2 * (getB) * (getC))) * Mathf.Rad2Deg;
                }
                else if (getA < 0)
                {
                    getAngle = -Mathf.Acos((Mathf.Pow((getB), 2) + Mathf.Pow((getC), 2) - Mathf.Pow((getA), 2)) /
                        (2 * (getB) * (getC))) * Mathf.Rad2Deg;
                }
                //getAngle = Mathf.Asin(getA * Mathf.Sin(90) / getC);
                //Debug.Log("A: " + getA + " B: " + getB + " C: " + getC + " Angle: " + getAngle);
            }

            // Set Rotating Angle
            currentRotation = transform.eulerAngles;
            getRotation = new Vector3(45f, getAngle, 0f);
        }
        // Move Camera
        transform.position = new Vector3(camX, 10.5f, camZ);

        //Rotate Camera
        //transform.eulerAngles = getRotation;
        transform.eulerAngles = Vector3.MoveTowards(currentRotation, getRotation, speed * Time.deltaTime);
    }
}

让我详细说明一下代码。当鼠标离它最近时，我希望相机朝向原点，反之亦然。我在这方面遇到了一些麻烦，因为我认为我设置不正确。我试图解决这个问题的尝试是使用反向逻辑（即当鼠标靠近原点时，相机距离原点最远 [鼠标 -> 对象 -> 相机）。如果鼠标是离原点最远 [相机 -> 对象 -> 鼠标]。）

既然你知道我遇到的一些问题，下面是我需要回答的问题（我希望你写一个解决方案并告诉我它是如何解决问题的。）：如何修复相机旋转以便鼠标移动它会立即旋转，如何指定鼠标是否靠近原点？

更新： 我将所有代码移至 LateUpdate，因为那是您应该执行相机算法的时间。我还 "tried" 简化了鼠标定位部分，所以它不是那么多余。我还有一个 link 到我的项目的屏幕截图：https://gyazo.com/2f5ee8f94c0bc55bbdeaeafa8a8b35f4

Answer 1

我找到了解决方案：

transform.rotation = Quaternion.RotateTowards(transform.rotation, getRotation, speed * Time.deltaTime);

Unity：使用鼠标位置为我的相机生成角度以围绕对象旋转

Unity: Using Mouse Position To Make Angles For My Camera To Rotate Around An Object

c#

unity3d

camera

trigonometry

mouse-position