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https://issues.apache.org/jira/browse/LUCENE-7212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15240230#comment-15240230
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Robert Muir commented on LUCENE-7212:
-------------------------------------

This is the one i was investigating for 2D: 
https://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain

But there are some steps/cleanups before this can be done/used in a reasonable 
fashion

> Add Geo3DPoint equivalents of LatLonPointDistanceComparator and 
> LatLonPointSortField
> ------------------------------------------------------------------------------------
>
>                 Key: LUCENE-7212
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7212
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: master
>            Reporter: Karl Wright
>            Assignee: Karl Wright
>
> Geo3D has a number of distance measurements and a generic way of computing 
> interior distance.  It would be great to take advantage of that for queries 
> that return results ordered by interior distance.



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