This simple node combines a camera and a skybox to allow huge dynamic scenes in the background of your game. You can incrementally render more stuff to it each frame, then switch the skybox out every couple of seconds, potentially adding hundreds of millions of polygons to your scene with no noticeable performance penalty.
Here’s a video of it in action:
You can get the code from IrrExt SVN, or grab a Windows demo. The demo actually streams a hundred thousand polygons to each of the six render targets each frame, so it is very slow and is for illustration purposes only.