how can I render a rear view ?

I want to render the front view in fullscreen and to put in a corner a small rear view. Is there any special way to do this (I mean not the logical way) ?
Does it take more time to render ?

You do not want a logical answer?
I can only come up with one way to do it:

  1. Render the normal fullscreen view
  2. Change so OpenGL will render in a small part of the corner.
  3. Move the camera
  4. Render the scene again.

The cost can be high if your application is using a lot of polygons but cheap if it is fiill limited.

Originally posted by mango:
The cost can be high if your application is using a lot of polygons but cheap if it is fiill limited.

small rear view?
use small LOD.