This tutorial is only on the static construction of a 3D model and the underlying graph. There is nothing chaining and there are not steps involved. Therefor our base code structure only requires the init function:

protected void init ()
[
	Axiom ==> F;
]

The 3d view and the graph structure created by the init function above

This function is called very time you reset your model.(either with the rest button by recompiling/saving the code). The basic theory behind it is that the model always rests to the Axiom node and then runs the init function, if one is provided.