GL.End 结束

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public Material mat;
	void OnPostRender() {
		if (!mat) {
			Debug.LogError("Please Assign a material on the inspector");
			return;
		}
		GL.PushMatrix();
		mat.SetPass(0);
		GL.LoadOrtho();
		GL.Begin(GL.TRIANGLES);
		GL.Color(new Color(1, 1, 1, 1));
		GL.Vertex3(0.5F, 0.25F, 0);
		GL.Vertex3(0.25F, 0.25F, 0);
		GL.Vertex3(0.375F, 0.5F, 0);
		GL.End();
		GL.Begin(GL.QUADS);
		GL.Color(new Color(0.5F, 0.5F, 0.5F, 1));
		GL.Vertex3(0.5F, 0.5F, 0);
		GL.Vertex3(0.5F, 0.75F, 0);
		GL.Vertex3(0.75F, 0.75F, 0);
		GL.Vertex3(0.75F, 0.5F, 0);
		GL.End();
		GL.Begin(GL.LINES);
		GL.Color(new Color(0, 0, 0, 1));
		GL.Vertex3(0, 0, 0);
		GL.Vertex3(0.75F, 0.75F, 0);
		GL.End();
		GL.PopMatrix();
	}
}

// Draws a Triangle, a Quad and a line
// with different colors
//绘制一个三角形，一个四边形和一条线，带有不同的颜色
var mat : Material;
function OnPostRender() {
	if (!mat) {
		Debug.LogError("Please Assign a material on the inspector");
		return;
	}
	GL.PushMatrix();
	mat.SetPass(0);
	GL.LoadOrtho();
	GL.Begin(GL.TRIANGLES); // Triangle 三角形
	GL.Color(Color(1,1,1,1));
	GL.Vertex3(0.50,0.25,0);
	GL.Vertex3(0.25,0.25,0);
	GL.Vertex3(0.375,0.5,0);
	GL.End(); // End drawing Triangle 结束绘制
	GL.Begin(GL.QUADS); // Quad 方形
	GL.Color(Color(0.5,0.5,0.5,1));
	GL.Vertex3(0.5,0.5,0);
	GL.Vertex3(0.5,0.75,0);
	GL.Vertex3(0.75,0.75,0);
	GL.Vertex3(0.75,0.5,0);
	GL.End(); // End drawing quad 结束绘制
	GL.Begin(GL.LINES); // Line 线
	GL.Color(Color(0,0,0,1));
	GL.Vertex3(0,0,0);
	GL.Vertex3(0.75,0.75,0);
	GL.End(); // End drawing Line 结束绘制
	GL.PopMatrix();
}