Teleporting Character From Edge to Edge of the Screen

Question

I am trying to Teleport a character from a Edge of the screen to the contrary edge I'm using this:

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.");

this work perfectly but the problem is that it teleport the character to the center and when I change the value to make it teleport to the edges it don't work correctly

Answer 1

The issue is that you transform a world coordinate ( transform.position ) to viewport space, do some changes, but never transform back from viewport space to worldspace before you apply it to transform.position .

    //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);