It is assumed that you have installed Octave 2.1.35 (http://www.octave.org) or more, FreeWRL (http://www.crc.ca/FreeWRL) 0.34 or more (versions between 0.27 and 0.31 may work too) and the Octave-Forge (http://octave.sourceforge.net) package. Each one is available from the indicated URL. Rudimentary knowledge of Octave is also assumed.