Main comment stating the purpose of this class and relevant relationship to other classes.

Possible useful expressions for doIt or printIt.

Structure:
instVar1 type -- comment about the purpose of instVar1
instVar2 type -- comment about the purpose of instVar2

Any further useful comments about the general approach of this implementation.

	converting
	asB3DVector3 asPoint

	printing
	printOn:

	tagging
	clearAllTags clearTag: setTag: testTag:

	testing
	isConnected isDeadEnd

	accessing	top
	degree
	faces
	faces:
	halfedge
	halfedge:
	incidentEdges
	tags
	tags:
	z
	z:

	converting	top
	asB3DVector3
	asPoint Answer the receiver itself.

	printing	top
	printOn: The receiver prints on aStream in terms of infix notation.

	tagging	top
	clearAllTags
	clearTag:
	setTag:
	testTag:

	testing	top
	isConnected
	isDeadEnd

	instance creation	top
	at: Primitive. Assumes receiver is indexable. Answer the value of an indexable element in the receiver. Fail if the argument index is not an Integer or is out of bounds. Essential. See Object documentation whatIsAPrimitive.