[Take screenshot] Take full/camera screenshot #unity

take-screenshot.cs

// 1. Take full screenshot
//// full screen
//// not support single camera
//// bad efficiency
void CaptureFullScreen() {
  Application.CaptureScreenshot("Screenshot.png", 0);
}

Texture2D CaptureFullScreen() {
  return Application.CaptureScreenshotAsTexture();
}

// 2. Take with texture2D
//// support rect
//// not support camera
Texture2D CaptureScreenshotWithTexture2D(Rect rect) {
  Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24,false);
  screenShot.ReadPixels(rect, 0, 0);
  screenShot.Apply();
  return screenShot;
}

// 3. Take cameras 
//// support rect
//// support camera but screen
Texture2D CaptureCamerasScreenshot(List<Camera> cameras, Rect rect) {
  RenderTexture rt = new RenderTexture((int)rect.width, (int)rect.height, 0);
  cameras.ForEach(camera => {
    camera.targetTexture = rt;
	camera.Render();
  })
  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();
  cameras.ForEach(camera => {
	camera.targetTexture = null;
  });
  RenderTexture.active = null; // JC: added to avoid errors
  GameObject.Destroy(rt);
  return screenShot;
}