U3D 三种实现截屏保存精彩瞬间方式

/// <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)
/// </summary>
/// <param name="mRect">M rect.</param>
/// <param name="mFileName">M file name.</param>
private IEnumerator CaptureByRect(Rect mRect,string mFileName)
{
//等待渲染线程结束
yield return new WaitForEndOfFrame();
//初始化Texture2D
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);

//如果需要可以返回截图
//return mTexture;
}

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
RenderTexture mRender=new RenderTexture((int)mRect.width,(int)mRect.height,0);
//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);

//如果需要可以返回截图
//return mTexture;
}

}

//定义图片保存路径
private string mPath1;
private string mPath2;
private string mPath3;

//相机
public Transform CameraTrans;

void Start()
{
//初始化路径
mPath1=Application.dataPath+"\\ScreenShot\\ScreenShot1.png";
mPath2=Application.dataPath+"\\ScreenShot\\ScreenShot2.png";
mPath3=Application.dataPath+"\\ScreenShot\\ScreenShot3.png";
}

//主方法，使用UGUI实现
void OnGUI()
{
if(GUILayout.Button("截图方式1",GUILayout.Height(30))){
CaptureByUnity(mPath1);
}
if(GUILayout.Button("截图方式2",GUILayout.Height(30))){
StartCoroutine(CaptureByRect(new Rect(0,0,1024,768),mPath2));
}
if(GUILayout.Button("截图方式3",GUILayout.Height(30))){
//启用顶视图相机
CameraTrans.camera.enabled=true;
//禁用主相机
Camera.main.enabled=false;
StartCoroutine(CaptureByCamera(CameraTrans.camera,new Rect(0,0,1024,768),mPath3));
}
}