-{ 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&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.
+{ first vertex of a filled polygon
+} last vertex of a filled polygon
+f one vertex of a filled polygon
+! decrease diameter of segment
+' increase color index
+, decrease color index