code: def takeStereoScreenshot(self, pchPreviewFilename, pchVRFilename):
          
  
          fn = self.function_table.takeStereoScreenshot
          pOutScreenshotHandle = ScreenshotHandle_t()
          result = fn(byref(pOutScreenshotHandle), pchPreviewFilename, pchVRFilename)
          return result, pOutScreenshotHandle
docs: Tells the compositor to take an internal screenshot of
           type VRScreenshotType_Stereo. It will take the current
           submitted scene textures of the running application and
           write them into the preview image and a side-by-side file
           for the VR image.
           This is similar to request screenshot, but doesn't ever
           talk to the application, just takes the shot and submits.