unity替换shader方法

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class 替换材质开关: MonoBehaviour {
    // Start is called before the first frame update

    public Camera mainCam;
    public Shader Shader;

    void Start () {

    }

    // Update is called once per frame
    void Update () {

    }

    void OnGUI () {
        if (GUI.Button (new Rect (10, 10, 200, 50), "overdraw")) {
            mainCam.SetReplacementShader (Shader, "RenderType");
            Debug.Log ("this is a test");

        }
        if (GUI.Button (new Rect (10, 70, 200, 50), "Reset")) {
            mainCam.ResetReplacementShader ();
        }
    }
}

shader1 :原shader
Tags {“RenderType”=“匹配标签名”}
shader2
Tags {“RenderType”=“匹配标签名”}

*匹配标签名要一致才能替换
*如果原、新shader的properties不一致容易出问题

overdraw后