unity实现截屏功能

unity的小功能，实现截屏

大致分三种：

1.针对指定的相机进行截屏

public Texture2D CaptureScreen(Camera came, Rect r)
{
	RenderTexture rt = new RenderTexture((int)r.width, (int)r.height, 0);

	came.targetTexture = rt;
	came.Render();

	RenderTexture.active = rt;
	Texture2D screenShot = new Texture2D((int)r.width, (int)r.height, TextureFormat.RGB24, false);

	screenShot.ReadPixels(r, 0, 0);
	screenShot.Apply();

	came.targetTexture = null;
	RenderTexture.active = null;
	GameObject.Destroy(rt);

	byte[] bytes = screenShot.EncodeToPNG();
	string filename = Application.streamingAssetsPath + "/ScreenShot.png";
	System.IO.File.WriteAllBytes(filename, bytes);

	return screenShot;
}

2.自定义截图的大小（包括UI）

public Texture2D CaptureScreen(Rect rect)
{
	Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24, false);

	screenShot.ReadPixels(rect, 0, 0);

	screenShot.Apply();

	byte[] bytes = screenShot.EncodeToPNG();
	string filename = Application.streamingAssetsPath + "/ScreenShot.png";
	System.IO.File.WriteAllBytes(filename, bytes);

	return screenShot;
    }

2.截取屏幕全屏

 public void CapruerScreen()
{
	// Application.CaptureScreenshot(Application.persistentDataPath + "ScreenShot.png", 0);//过时的方法
	ScreenCapture.CaptureScreenshot( Application.streamingAssetsPath + "/ScreenShot.png", 0);       
}