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https://issues.apache.org/jira/browse/LUCENE-6196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14481217#comment-14481217
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Karl Wright commented on LUCENE-6196:
-------------------------------------

Ok, I will wait to see how the integration progresses before asking the SIS 
team if they would have an interest.
The body of code involved is obviously highly tuned for the search problem; 
it's not as good a fit for the SIS mission (seems to me).  But I'd rather it 
went there than nowhere.

> Include geo3d package, along with Lucene integration to make it useful
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-6196
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6196
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: modules/spatial
>            Reporter: Karl Wright
>            Assignee: David Smiley
>         Attachments: ShapeImpl.java, geo3d-tests.zip, geo3d.zip
>
>
> I would like to explore contributing a geo3d package to Lucene.  This can be 
> used in conjunction with Lucene search, both for generating geohashes (via 
> spatial4j) for complex geographic shapes, as well as limiting results 
> resulting from those queries to those results within the exact shape in 
> highly performant ways.
> The package uses 3d planar geometry to do its magic, which basically limits 
> computation necessary to determine membership (once a shape has been 
> initialized, of course) to only multiplications and additions, which makes it 
> feasible to construct a performant BoostSource-based filter for geographic 
> shapes.  The math is somewhat more involved when generating geohashes, but is 
> still more than fast enough to do a good job.



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