Also, speaking of variables... have we ruled out any of them yet?  I personally don't see much use for the 'usecenter' code.  If I had my druthers, I'd prune all that out just to clean things up some.  We could also get rid of the 'mixboxes' variable unless the toggle is still needed in some cases in the local space runs (?).  For worldspace, it should always be true, so you could use that.

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