Talk:Octree

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[edit] What is an MX octtree?

This article mentions an "MX octtree". Unfortunately, no where are such trees explained.

This article also mentions that PR octtrees can represent "infinite" space. To me, this is somewhat vague. Perhaps the word "unbounded" would be more appropriate? In any case, I do not quite see how it is possible for an octtree to keep track of things which may be arbitrarily far away from some center. This relates to my first question, because this seems to be where the difference lies between PR and MX varieties of octtrees.

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