Unity内屏幕截图详解

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介绍Unity内屏幕截图的三种方式

1.全屏截图

2.局部截图

3.非MainCamera视角截图

按照下图搭建场景,将截图保存到Resources文件夹下.

将游戏物体Camera的状态设置为未激活.并给它调整好一个截图的视角.

定义需要用到的字段.

using UnityEngine;
using System.Collections;
using System.IO;
using UnityEditor;
using UnityEngine.UI;

public class ScreenShot : MonoBehaviour
{
    //定义图片保存路径
    private string m_FullShotPath;
    private string m_partShotPath;
    private string m_OtherCameraPath;
    //这个不是Main相机，其他摄像机，默认不激活它
    public Camera CameraTrans;
    //显示图片
    public RawImage image;

    void Start ()
    {
        //初始化路径，实际使用应该用Application.persistentDataPath，
        //因为使用dataPath就是Asset文件不能读写操作
        m_FullShotPath = Application.dataPath + "/Resources/FullScreenShot.png";
        m_partShotPath = Application.dataPath + "/Resources/PartScreenShot.png";
        m_OtherCameraPath = Application.dataPath + "/Resources/OtherCameraScreenShot.png";
    }

在Unity回调方法OnGUI( )中, 创建”截图”和"加载图片”按钮

////在Unity回调中初始化按钮
    void OnGUI ()
    {
        if (GUILayout.Button ("全屏截图", GUILayout.Height (50))) {
            print ("全屏截图OK");
            CaptureByUnity (m_FullShotPath);
            AssetDatabase.Refresh ();
        }

        if (GUILayout.Button ("局部截图", GUILayout.Height (50))) {
            print ("局部截图OK");
            StartCoroutine (CaptureByRect (new Rect (0, 0, 1024, 768), m_partShotPath));
        }

        if (GUILayout.Button ("非MainCamera截图", GUILayout.Height (50))) {
            //启用顶视图相机
            CameraTrans.gameObject.SetActive (true);
            //禁用主相机
            Camera.main.enabled = false;
            //这里一定要先指定一个分辨率。不然截图就会卡顿，现在先写死值，以后再设置活
            StartCoroutine (CaptureByCamera (CameraTrans, new Rect (0, 0, 1024, 768),
                m_OtherCameraPath));
            print ("非MainCamera截图OK");
        }

        if (GUILayout.Button ("加载图片", GUILayout.Height (50))) {
            Debug.Log ("加载图片"); 
            Texture2D _tex = (Texture2D)Resources.Load ("FullScreenShot");
            image.texture = _tex;
        }
    }

三种截图方法

/// <summary>
    /// 使用Application类下的CaptureScreenshot()方法实现截图
    /// 优点：简单，可以快速地截取某一帧的画面、全屏截图
    /// 缺点：不能针对摄像机截图，无法进行局部截图
    /// </summary>
    /// <param name="mFileName">M file name.</param>
    private void CaptureByUnity (string mFileName)
    {
        Application.CaptureScreenshot (mFileName, 0);
    }

    /// <summary>
    /// 根据一个Rect类型来截取指定范围的屏幕, 左下角为(0,0)
    /// 读取屏幕像素存储为纹理图片
    /// </summary>
    /// <param name="mRect">M rect.截屏的大小</param>
    /// <param name="mFileName">M file name.保存路径</param>
    private IEnumerator CaptureByRect (Rect mRect, string mFileName)
    {
        //等待渲染线程结束
        yield return new WaitForEndOfFrame ();
        //初始化Texture2D, 大小可以根据需求更改
        Texture2D mTexture = new Texture2D ((int)mRect.width, (int)mRect.height,
                                 TextureFormat.RGB24, false);
        //读取屏幕像素信息并存储为纹理数据
        mTexture.ReadPixels (mRect, 0, 0);
        //应用
        mTexture.Apply ();
        //将图片信息编码为字节信息
        byte[] bytes = mTexture.EncodeToPNG ();  
        //保存
        System.IO.File.WriteAllBytes (mFileName, bytes);
        //需要展示次截图，可以返回截图,或者使用out修饰参数也可以带出去
        //return mTexture;
    }

    /// <summary>
    /// 指定相机截图
    /// </summary>
    /// <returns>The by camera.</returns>
    /// <param name="mCamera">M camera.要被截屏的相机</param>
    /// <param name="mRect">M rect. 截屏的区域</param>
    /// <param name="mFileName">M file name.</param>
    private IEnumerator  CaptureByCamera (Camera mCamera, Rect mRect, string mFileName)
    {
        //等待渲染线程结束
        yield return new WaitForEndOfFrame ();
        //初始化RenderTexture   深度只能是【0、16、24】截不全图请修改
        RenderTexture mRender = new RenderTexture ((int)mRect.width, (int)mRect.height,16);
        //设置相机的渲染目标
        mCamera.targetTexture = mRender;
        //开始渲染
        mCamera.Render ();
        //激活渲染贴图读取信息
        RenderTexture.active = mRender;
        Texture2D mTexture = new Texture2D ((int)mRect.width, (int)mRect.height, TextureFormat.RGB24, false);
        //读取屏幕像素信息并存储为纹理数据
        mTexture.ReadPixels (mRect, 0, 0);
        //应用
        mTexture.Apply ();
        //释放相机，销毁渲染贴图
        mCamera.targetTexture = null;   
        RenderTexture.active = null; 
        GameObject.Destroy (mRender);  
        //将图片信息编码为字节信息
        byte[] bytes = mTexture.EncodeToPNG ();  
        //保存
        System.IO.File.WriteAllBytes (mFileName, bytes);
        //需要展示次截图，可以返回截图
        //return mTexture;
    }```     

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