DESCRIPTION
-----------

LSystem3d is a experimental Lindenmayer System generator with 3d capabilities,
whose main goal is to generate all kinds of plants or whatever fractal
l-system structures the user desires. For now, LSystem3d is highly under
development and is considered alpha, that is, lots of things are missing and
it will probably not work 100% accurate.



REQUIREMENTS
------------

Currently tested in Debian GNU/Linux (Sid) only, but should compile fine on
other platforms without bigger modification.

Necessary libs:

OpenGL
GLU
GLUI User Interface Library
GLUT (freeglut)
libxml++
glibmm



USAGE
-----

Keys:

Esc        quit
+          zoom in
-          zoom out
y          rotate around the y-axis
Up         move camera up
Down       move camera down
Left       move camera left
Right      move camera right
PageUp     move camera forth
PageDown   move camera back


Rules:

=     name/rule separator
A-Z   rewrite operator, step forward
+     turn left
-     turn right
&     pitch down
^     pitch up
\     roll left
/     roll right
|     turn around 180 degrees
[     save state to stack
]     restore state from stack
{     first vertex of a filled surface
}     last vertex of a filled surface
f     one vertex of a filled surface
!     decrement diameter of segment


Example:

The GUI input

Axiom:       A
Rule #1:     A=A/[!+A&A]/A
Angle:       30.0
Iterations:  4

will render a simple l-system and create the xml-structure

<?xml version="1.0"?>
<lsystem>
  <axiom>A</axiom>
  <rule name="A">A/[!+A&amp;A]/A</rule>
  <angle>30.0</angle>
  <iterations>4</iterations>
</lsystem>

and save it to the file named "lsystem.xml" when quitting. The same file will
be initially loaded every time LSystem3d is started.