【Unity】屏幕边界的世界坐标及可视化

using UnityEngine;
using System.Collections;
using System;

namespace Helper
{

    public class ScreenBounding
    {
        Vector3[] boundingBoxes;
        Camera mainCamera;

        //UV坐标转对应世界坐标
        Vector3[] viewportPoint =
        {
        new Vector3(0.5f,1),//top middle
        new Vector3(0.5f,0),//bottom middle
        new Vector3(1,0.5f),//middle right
        new Vector3(0,0.5F),//middle left
        };

        public Vector3 topPos { get { return boundingBoxes[0]; } }
        public Vector3 bottomPos { get { return boundingBoxes[1]; } }
        public Vector3 rightPos { get { return boundingBoxes[2]; } }
        public Vector3 leftPos { get { return boundingBoxes[3]; } }
        public float height { get { return boundingBoxes[0].y - boundingBoxes[1].y; } }

        public ScreenBounding()
        {
            mainCamera = Camera.main;
            CreateBoundingBox();
        }

        void CreateBoundingBox()
        {
            boundingBoxes = new Vector3[viewportPoint.Length];

            for (int i = 0; i < boundingBoxes.Length; i++)
            {
                //转换坐标
                Vector3 origin = mainCamera.ViewportToWorldPoint(viewportPoint[i]);
                origin.z = 0;
                boundingBoxes[i] = origin;
            }
            #if UNITY_EDITOR
            //编辑器下可视化
            BoundBoxs();
            #endif
        }

        void BoundBoxs()
        {
            GameObject allBox = new GameObject("BoundingBoxs");
            for (int i = 0; i < boundingBoxes.Length; i++)
            {
                GameObject edgeBox = new GameObject();
                edgeBox.transform.SetParent(allBox.transform);
                edgeBox.transform.position = boundingBoxes[i];
            }
        }

    }
}