Turtle interface

[aviks]

A 3D Turtle interface would be great to have.

In 3D, turtle needs yaw, pitch and roll commands.

[Ellipse0934]

TODO's:

• basic Implementation
• Introduction and basic shapes and structures
• Fractals
• Examples from "Algorithmic beauty of Plants" (http://algorithmicbotany.org/papers/abop/abop.pdf)