GL.SetRevertBackfacing 设置恢复背面

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public Material mat;
	public bool swap = false;
	void Update() {
		if (Input.GetKeyDown(KeyCode.Space))
			if (swap)
				swap = false;
			else
				swap = true;

	}
	void OnPostRender() {
		if (!mat) {
			Debug.LogError("Please Assign a material on the inspector");
			return;
		}
		GL.PushMatrix();
		mat.SetPass(0);
		GL.LoadOrtho();
		GL.Color(Color.yellow);
		GL.Begin(GL.TRIANGLES);
		GL.SetRevertBackfacing(swap);
		GL.Vertex3(0, 0, 0);
		GL.Vertex3(1, 1, 0);
		GL.Vertex3(0, 1, 0);
		GL.Vertex3(0, 0, 0);
		GL.Vertex3(1, 1, 0);
		GL.Vertex3(1, 0, 0);
		GL.End();
		GL.PopMatrix();
	}
}

// Draws 2 yellow triangles and makes them appear/dissapear
// depending on the vertex draw order
// Notice that everything on the scene will suffer from the revert
// backfacing as well
//绘制2个黄色三角形并使他们可见/不可见，取决于点的绘制顺序
//注意，场景中所有物体都将受到SetRevertBackfacing的影响
var mat : Material;

var swap : boolean = false;
function Update() {
	if(Input.GetKeyDown(KeyCode.Space)) {
		if(swap) {
			swap = false;
		} else {
			swap = true;
		}
	}
}

function OnPostRender() {
	if (!mat) {
		Debug.LogError("Please Assign a material on the inspector");
		return;
	}
	GL.PushMatrix();
	mat.SetPass(0);
	GL.LoadOrtho();
	GL.Color(Color.yellow);
	GL.Begin(GL.TRIANGLES);
	GL.SetRevertBackfacing(swap);
	GL.Vertex3(0,0,0);
	GL.Vertex3(1,1,0);
	GL.Vertex3(0,1,0);
	GL.Vertex3(0,0,0);
	GL.Vertex3(1,1,0);
	GL.Vertex3(1,0,0);
	GL.End();
	GL.PopMatrix();
}