Unity截屏
截屏，截图
1……使用Application 提供的api
Application.CaptureScreenshot(Application.dataPath + "/11.png");
2…..利用Texture2D提供的函数 ReadPixels，注意要在每帧渲染完成后才能使用，
否则会抛出异常： ReadPixels was called to read pixels from system frame buffer, while not inside drawing frame.，该函数是从 读取的 RenderTexture. active。下面是文档说明
This will copy a rectangular pixel area from the currently active RenderTexture or the view (specified by the source parameter) into the position defined by destX anddestY. Both coordinates use pixel space – (0,0) is lower left.
IEnumerator Cap()
{
yield return new WaitForEndOfFrame();
Texture2D tex = new Texture2D(Screen.width, Screen.height);
tex.ReadPixels(new Rect(Vector2.zero, new Vector2(Screen.width, Screen.height)), 0, 0);
var raw = tex.EncodeToPNG();
string filename = Application.dataPath + "/111.png";
System.IO.File.WriteAllBytes( filename, raw);
}
3…….摄像机可以Render到RenderTexture 然后执行保存相关操作