Unity - 尝试将立方体移动到鼠标位置 - 立方体向错误的方向移动

Question

我正在尝试制作一个简单的游戏，当玩家按下鼠标按钮时，立方体会追逐鼠标。

到目前为止，这是我的代码：

public class PlayerCubeController : MonoBehaviour {

    public float speed = 1.0f;
    Vector3 targetPos = new Vector3();

    void Start () {
        speed = speed * 0.01f;
    }

    void Update () {
        if (Input.GetMouseButtonDown (0)) {
            Debug.Log (Input.mousePosition);
            targetPos = Input.mousePosition;
            targetPos.z = 0;

        } else if (Input.GetMouseButtonUp (0)) {
            targetPos = transform.position;
        }

        transform.position = Vector3.Lerp (transform.position, targetPos, speed * Time.deltaTime);
    }
}

不幸的是，立方体永远不会朝向鼠标的方向;我可以将鼠标放在屏幕的左下角，但立方体仍然会显示在右上方。

奇怪的是，如果我将鼠标放在屏幕的左侧，立方体就会直线上升。

谁能告诉我哪里出错了？

Answer 1

您的问题很简单：Input.mousePosition在屏幕坐标中定义鼠标位置（例如，从（0,0）到（1920,1080））。如果你想从鼠标位置获得一个3d点，你还有一个额外的步骤。我看到两种可能性：

使用Camera.main.ScreenToWorldPoint并手动指定相机的距离：

 var v = Input.mousePosition;
 v.z = 10.0;
 v = Camera.main.ScreenToWorldPoint(v);
 // Move your cube to v

文档：https://docs.unity3d.com/ScriptReference/Camera.ScreenToWorldPoint.html

或者使用光线投射来获取您的观点，例如使用Camera.main.ScreenPointToRay：

    Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
    RaycastHit hit;

    if (Physics.Raycast(ray, out hit, 100))
        // Move your cube to hit.point

文档：https://docs.unity3d.com/ScriptReference/Camera.ScreenPointToRay.html

Answer 2

简而言之，您需要从屏幕转换为世界坐标。这是一个例子

https://docs.unity3d.com/ScriptReference/Camera.ScreenToWorldPoint.html

有些事情：

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      "host": "52.41.186.122",
      "username": "ubuntu",
      // "password": "ubuntu"
      // or pem file (ssh based authentication)
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    }
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  // Install MongoDB in the server, does not destroy local MongoDB on future setup
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  // WARNING: Node.js is required! Only skip if you already have Node.js installed on server.
  "setupNode": true,

  // WARNING: If nodeVersion omitted will setup 0.10.43 by default. Do not use v, only version number.
  "nodeVersion": "4.4.7",

  // Install PhantomJS in the server
  "setupPhantom": true,

  // Show a progress bar during the upload of the bundle to the server.
  // Might cause an error in some rare cases if set to true, for instance in Shippable CI
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  // Application name (No spaces)
  "appName": "deep-app",

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  "app": "/home/cortana/Desktop/deep-app",

  // Configure environment
  "env": {
    "PORT": 8888,
    "ROOT_URL": "http://52.41.186.122",
    "MONGO_URL": "mongodb://localhost/meteor"
  },

  // Meteor Up checks if the app comes online just after the deployment
  // before mup checks that, it will wait for no. of seconds configured below
  "deployCheckWaitTime": 15
}