I'd like to promote an (freeware) utility for generation of L-Systems called R(ay)T(raced)Evol(ution).
L-Systems are fractal structures which can be defined by simple rules and parameters but behave
as plants are growing (in very short terms).

RTEvol is available for several OS under
    http://www.rz.tu-ilmenau.de/~juhu/GX/RTEvol/

RTEvol supports:

• definition of L-System tables for parametric, stochastic, and timed L-Systems
• definition of tropism vector
• mathematical vector and matrix  operations
• a 3D graphics turtle support
• freely programmable (POV-) script output via print() function
• definition of your own functions (C-like)

If you need further information about L-systems refer to the following adresses:

•  http://www.xs4all.nl/~ljlapre/  (where another L-System tool is available)
•  http://www.ctpm.uq.edu.au/Programs/IPI/ipiwww.html (some further links)
•  http://www.cpsc.ucalgary.ca/projects/bmv/index.html (excellent demos)

Guenther
--
~~o~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 O o  __/|_   "I'm swimming,     | Guenther Makulik
   O /*    \/| I'm swimming ..." | E-Mail:   makulik@evolution.org
     \_U___/\| (Sonic Youth)     | http://members.evolution.org/gmakulik/