EdgeCollider2D墙不会阻止物体脱离屏幕

Question

我正在尝试为我的游戏创建一个EdgeCollider2D脚本。从下面的代码可以看出它覆盖了主摄像头左右两端的一部分。左侧壁工作，防止物体向左移动，但右侧墙不能防止物体离开屏幕。我不太确定导致它的原因。

using UnityEngine;
using System.Collections;
using System.Collections.Generic;


public class GameEdgeScript : MonoBehaviour {

// lets make verticies for the edge collider 2d
List<Vector2> newVerticies = new List<Vector2>();
EdgeCollider2D col;

// Use this for initialization
void Awake () {

    col = gameObject.AddComponent<EdgeCollider2D>();

    Camera camera = GameObject.FindGameObjectWithTag ("MainCamera").GetComponent<Camera> ();
    Vector3 screenSize = camera.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, camera.nearClipPlane));

    float height1 = GameObject.FindGameObjectWithTag ("spriteHigh").GetComponent<SpriteRenderer> ().sprite.rect.height/2;
    float height2 = Screen.height*((float)0.8) + GameObject.FindGameObjectWithTag ("spriteLow").GetComponent<SpriteRenderer> ().sprite.rect.height/2;

    newVerticies.Add( (Vector2)camera.ScreenToWorldPoint(new Vector3(0, height1, camera.nearClipPlane)));
    newVerticies.Add( (Vector2)camera.ScreenToWorldPoint(new Vector3(0, height2, camera.nearClipPlane)));
    newVerticies.Add( (Vector2)camera.ScreenToWorldPoint(new Vector3(Screen.width, height2, camera.nearClipPlane))); // NOT BLOCKING OBJECTS AT THE RIGHT X VALUE (Screen.width)
    newVerticies.Add( (Vector2)camera.ScreenToWorldPoint(new Vector3(Screen.width, height1, camera.nearClipPlane)));// NOT BLOCKING OBJECTS AT THE RIGHT X VALUE (Screen.width)

    Debug.Log (Screen.width);

    getPointsToDebug ();

    setPoints ();

    for (int i = 0; i<col.points.Length; i++) {
        Debug.Log (col.points[i]);
    }


void getPointsToDebug() {
    foreach (Vector2 piste in col.points) {
        Debug.Log(piste);
    }
}

void setPoints() {
    col.points = newVerticies.ToArray();
    }

}