在unity里用GL画线框

    最近由于闲来无事，无意中看到vectrosity这个画线插件，就想研究一下，下载下来之后发现导入到unity里之后出现错误，由于自己是蠢新所以改了一通也没改对，所以就放弃了，大家需要插件的话待会我会上下载链接，自己可以试试，我的版本是5.2.2的，在找到http://blog.csdn.net/awnuxcvbn/article/details/17279837这个利用GL画线的，但是感觉效果不好，所以自己修改了一下，改成了画线框的，其实就是确定了四个点而已，而且修改成了与鼠标同步画线的效果，大家有兴趣的可以看看，共同进步···········

using UnityEngine;
using System.Collections;
public class Line : MonoBehaviour
{
    public Material mat;
    public Color color = Color.red;
    public Vector3 pos1;
    public Vector3 pos2;

    void Start()
    {
        mat.color = color;
    }

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            pos1 = Input.mousePosition;
        }
        if (Input.GetMouseButton(0))
        {
            pos2 = Input.mousePosition;
        }
    }

    void OnPostRender()
    {
        GL.PushMatrix();
        mat.SetPass(0);
        GL.LoadOrtho();
        GL.Begin(GL.LINES);
        GL.Color(color);
        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();
    }
}