【基础】Unity截图时只截取场景内容

using UnityEngine;
using System.Collections;

public class CaptureTest : MonoBehaviour {
    public Camera gameCamera;
    public Camera bgCamera;
    // Use this for initialization
    void Start () {
    
    }
    
    // Update is called once per frame
    void Update () {
    
    }

    void OnClick()
    {
        Rect rect=new Rect(0,0,Screen.width,Screen.height);
        CaptureCamera(gameCamera, bgCamera, rect);
    }
    Texture2D CaptureCamera(Camera gameCamera,Camera bgCamera, Rect rect)
    {
        // 创建一个RenderTexture对象
        RenderTexture rt = new RenderTexture((int)rect.width, (int)rect.height, 0);
        // 设置两个camera的targetTexture
        gameCamera.targetTexture = rt;
        bgCamera.targetTexture = rt;
       //注意渲染顺序
        bgCamera.Render();
        gameCamera.Render();
   
        // 激活这个rt, 并从中中读取像素。
        RenderTexture.active = rt;
        Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24, false);
        screenShot.ReadPixels(rect, 0, 0);// 注：这个时候，它是从RenderTexture.active中读取像素
        screenShot.Apply();

        // 重置相关参数，以使用camera继续在屏幕上显示
        gameCamera.targetTexture = null;
        bgCamera.targetTexture = null;
        //ps: camera2.targetTexture = null;
        RenderTexture.active = null; // JC: added to avoid errors
        GameObject.Destroy(rt);
        // 最后将这些纹理数据，成一个png图片文件
        byte[] bytes = screenShot.EncodeToPNG();
        string filename = Application.dataPath + "/Screenshot.png";
        System.IO.File.WriteAllBytes(filename, bytes);
        Debug.Log(string.Format("截屏了一张照片: {0}", filename));

        return screenShot;
    }
}