The
mirror article was just updated to include some mirror examples that work with Vizard 4.
The mirror code does not support the reflection of one mirror inside of another.
You can add more than one mirror. Depending on your system and the complexity of your environment you can test to see what works for you. With each additional mirror there is more calculation necessary to render the scene. At some point the framerate will start to drop.
There is some example code towards the end of that article that describe how to change the alpha of a mirror object and change it's orientation.