<p>The inner radius of the outer child may be equal to zero due to the following code</p>
<pre><code> VantagePointTree* tree = this;
while (tree->Parent() != NULL)
{
tree->Parent()->Bound() |= tree->Bound();
tree->Parent()->furthestDescendantDistance = 0.5 *
tree->Parent()->Bound().Diameter();
tree = tree->Parent();
}
</code></pre>
<p>(we have to ensure that each parent contains its children), there is no errors.</p>
<p>It seems I do not use <code>FirstSiblingFirstPointIsCentroid</code> correctly. I have to think about it.</p>
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