In my French version
Nothing about render programs but you have several links about the subject show!
Each function is detailed.
http://www.editions-belin.com/ewb_pages/f/fiche-article-surprenantes-images-des-mathematiques-16456.php
Press book's image under "Feuilletez un extrait" (on the top left page then Choose a page then Slider Zoom)

Thanks for the info Pilou, much appreciated!

Regards
Stefan