【常用】截取相机图片截图功能

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_25601345/article/details/88548049

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

public class ScreenShot : MonoBehaviour
{

    public Camera mainCamera;
    public Camera uiCamera;
    /// <summary>    
    /// 对相机截图。     
    /// </summary>    
    /// <returns>The screenshot2.</returns>    
    /// <param name="camera">Camera.要被截屏的相机</param>    
    /// <param name="rect">Rect.截屏的区域</param>    
    public  Texture2D CaptureCamera(Camera camera,  Rect rect)
    {
        // 创建一个RenderTexture对象    
        RenderTexture rt = new RenderTexture((int)rect.width, (int)rect.height, -1);
        // 临时设置相关相机的targetTexture为rt, 并手动渲染相关相机    
        camera.targetTexture = rt;
        camera.Render();
        //ps: --- 如果这样加上第二个相机，可以实现只截图某几个指定的相机一起看到的图像。    
        //camera2.targetTexture = rt;
        //camera2.Render();
        //ps: -------------------------------------------------------------------    

        // 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    
        camera.targetTexture = null;
        //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();

        //存放
        string filename = Application.streamingAssetsPath + "/Screenshot.png";

        System.IO.File.WriteAllBytes(filename, bytes);
        Debug.Log(string.Format("截屏了一张照片: {0}", filename));

        return screenShot;
    }
    public  void ScreenST()
    {
       
            CaptureCamera(mainCamera,  new Rect(0, 0, Screen.width, Screen.height));
        
    }
}