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.

	comparing
	= hash species

	converting
	asB3DVector3

	measure
	angleTo: length vector

	printing
	printOn:

	tagging
	clearAllTags clearTag: getTag: setTag: setTag:to: setTagAll: setTagEdge: setTagEnds: testTag:

	testing
	hasAllInsideCircle: oneEndIs: sideOf:

	accessing	top
	destination
	destination:
	face
	face:
	midpoint
	next
	next:
	opposite
	opposite:
	origin
	origin:
	otherEnd:
	prev
	prev:
	sharesVertexWith:
	tags
	tags:

	comparing	top
	= Answer whether the receiver and the argument represent the same object. If = is redefined in any subclass, consider also redefining the message hash.
	hash Answer a SmallInteger whose value is related to the receiver's identity. May be overridden, and should be overridden in any classes that define =
	species Answer the preferred class for reconstructing the receiver. For example, collections create new collections whenever enumeration messages such as collect: or select: are invoked. The new kind of collection is determined by the species of the original collection. Species and class are not always the same. For example, the species of Interval is Array.

	converting	top
	asB3DVector3

	measure	top
	angleTo: Returns the angle in radians between self and anHalfedge as if they had the same origin. The angle is measured counter clockwise.
	length
	vector

	printing	top
	printOn: Append to the argument, aStream, a sequence of characters that identifies the receiver.

	tagging	top
	clearAllTags
	clearTag:
	getTag:
	setTag:
	setTag:to:
	setTagAll:
	setTagEdge:
	setTagEnds:
	testTag:

	testing	top
	hasAllInsideCircle: Tests if all Points in aCollection are inside the circle which has this edge as a diameter
	oneEndIs:
	sideOf: