I store Balloon 3D primitive vertices in place. I am used to pass data efficiently to the primitive level during high-bandwidth operations.

	enumerating
	upTo:do: upTo:doWithIndex:

	private
	privateReplaceFrom:to:with:startingAt:

	accessing	top
	at: Return the primitive vertex at the given index
	at:put: Store the primitive vertex at the given index in the receiver
	size Return the number of primitive vertices that can be stored in the receiver

	enumerating	top
	upTo:do: Special enumeration message so the client can modify the vertices
	upTo:doWithIndex: Special enumeration message so the client can modify the vertices

	private	top
	privateReplaceFrom:to:with:startingAt:

	instance creation	top
	new: Answer an instance of this class with the number of indexable variables specified by the argument, sizeRequested.