unity gl 画线

using UnityEngine;

using System.Collections;

public class TGLLine : MonoBehaviour {

	private static Material mat;

	void Start () {

		CreateLineMaterial();

	}

	void Update () {

	}

	//画线框用的mat

	public static Material CreateLineMaterial(){

		mat = new Material("Shader \"Lines/Colored Blended\" {" +

		                       "SubShader { Pass { " +

		                       " Blend SrcAlpha OneMinusSrcAlpha " +

		                       " ZWrite Off Cull Off Fog { Mode Off } " +

		                       " BindChannels {" +

		                       " Bind \"vertex\", vertex Bind \"color\", color }" +

		                       "} } }");

		mat.hideFlags = HideFlags.HideAndDontSave;

		mat.shader.hideFlags = HideFlags.HideAndDontSave;

		//mat.SetPass(0);

		return mat;

	}

	void OnRenderObject() {

		ShowLine(Color.green);

	}

	void ShowLine(Color c,float offsety = 0.2f)

	{

		//设置当前的材质

		mat.SetPass( 0 );

		GL.Begin( GL.LINES );

		GL.Color(c);

		for(int i=0;i<3;i++){

			Vector3 p0;

			p0.x=0f;

			p0.z=0f;

			p0.y=0+offsety;

			GL.Vertex(p0);

			Vector3 p;

			p.x=9f;

			p.z=0f+i*2;

			p.y=offsety;

			GL.Vertex(p);

		}

		GL.End();

	}

}