由于最近做个功能，想要在屏幕上画个框框突出下 我要显示的东西，所以简单使用GL写了个画线框的方法,只要传入两个点就可以了
using UnityEngine;
using System.Collections;
public class DrawLine : MonoBehaviour {
public Material mat;
private Vector2 screenStartPos, screenEndPos;
void OnPostRender(Vector2 pos1, Vector2 pos2)
{
GL.PushMatrix();
mat.SetPass(0);
GL.LoadOrtho();
GL.Begin(GL.LINES);
GL.Color(Color.red);
GL.Vertex3(pos1.x / Screen.width, pos1.y / Screen.height, 0);
GL.Vertex3(pos2.x / Screen.width, pos1.y / Screen.height, 0);
GL.Vertex3(pos2.x / Screen.width, pos1.y / Screen.height, 0);
GL.Vertex3(pos2.x / Screen.width, pos2.y / Screen.height, 0);
GL.Vertex3(pos2.x / Screen.width, pos2.y / Screen.height, 0);
GL.Vertex3(pos1.x / Screen.width, pos2.y / Screen.height, 0);
GL.Vertex3(pos1.x / Screen.width, pos2.y / Screen.height, 0);
GL.Vertex3(pos1.x / Screen.width, pos1.y / Screen.height, 0);
GL.End();
GL.PopMatrix();
}
}
