unity3D 鼠标点击拖动画线(平面)

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using UnityEngine;using System.Collections;public class Test : MonoBehaviour{    public Material mat;    public Color color = Color.red;    public Vector3 pos1;    public Vector3 pos2;    public bool isReady = false;    void Start()    {        mat.color = color;    }    void Update()    {        if (Input.GetMouseButtonDown(0))        {            pos1 = Input.mousePosition;        }        if (Input.GetMouseButtonUp(0))        {            pos2 = Input.mousePosition;            isReady = true;        }    }    void OnPostRender()    {        if (isReady)        {            GL.PushMatrix();            mat.SetPass(0);            GL.LoadOrtho();            GL.Begin(GL.LINES);            GL.Color(color);            GL.Vertex3(pos1.x/Screen.width, pos1.y/Screen.height, pos1.z);            GL.Vertex3(pos2.x / Screen.width, pos2.y / Screen.height, pos2.z);            GL.End();            GL.PopMatrix();        }    }}

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