Engine.OnFrameRender Method

This callback function will be called at the end of every frame to perform all the rendering calls for the scene, and it will also be called if the window needs to be repainted. After this function has returned, the sample framework will call Device.Present to display the contents of the next buffer in the swap chain

public void OnFrameRender(
   Device device,
   double appTime,
   float elapsedTime
);