garden_client/Assets/Script/Manage/PhotoShopCamera.cs

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

public class PhotoShopCamera : MonoBehaviour 
{
    public Camera shotCam;
    public Action<Texture2D> onRenderFinish;

    public void Awake()
    {
        shotCam = GetComponent<Camera>();
    }

    public void OnPostRender()
    {
        //设定当前RenderTexture为快照相机的targetTexture
        RenderTexture rt = shotCam.targetTexture;
        RenderTexture.active = rt;
        Texture2D tex = new Texture2D(rt.width, rt.height);
        
        //读取缓冲区像素信息
        tex.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
        tex.Apply();

        if (onRenderFinish != null)
        {
            onRenderFinish.Invoke(tex);
        }

        Destroy(tex);
    }
}