unity-game-engine - 将角色从屏幕的边缘传送到屏幕的边缘

Question

我正在尝试将角色从屏幕边缘传送到我正在使用的相反边缘:

var pos: Vector3 = Camera.main.WorldToViewportPoint(transform.position);

       if (pos.x < 0.0) {
           pos = new Vector3(0.0, 0.0, 0.0);
           transform.position = pos;
           //Debug.Log("I am left of the camera's view.");
       }


       if (1.0 < pos.x) {
           pos = new Vector3(0.0, 0.0, 0.0);
           transform.position = pos;
          // Debug.Log("I am right of the camera's view.");
       } 
        if (pos.y < 0.0) Debug.Log("I am below the camera's view.");
        if (1.0 < pos.y) Debug.Log("I am above the camera's view.");

这个工作完美，但问题是它将角色传送到中心，当我更改值以使其传送到边缘时，它无法正常工作

Answer 1

问题在于，您将世界坐标 (transform.position) 转换为视口(viewport)空间，进行一些更改，但在将其应用于 transform 之前，切勿从视口(viewport)空间转换回世界空间.位置.

    //you get a world space coord and transfom it to viewport space.
    Vector3 pos = Camera.main.WorldToViewportPoint(transform.position);

    //everything from here on is in viewport space where 0,0 is the bottom 
    //left of your screen and 1,1 the top right.
    if (pos.x < 0.0f) {
        pos = new Vector3(1.0f, pos.y, pos.z);
    }
    else if (pos.x >= 1.0f) {
        pos = new Vector3(0.0f, pos.y, pos.z);
    }
    if (pos.y < 0.0f) {
        pos = new Vector3(pos.x, 1.0f, pos.z);
    }
    else if (pos.y >= 1.0f) {
        pos = new Vector3(pos.x, 0.0f, pos.z);
    }

    //and here it gets transformed back to world space.
    transform.position = Camera.main.ViewportToWorldPoint(pos);