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https://issues.apache.org/jira/browse/LUCENE-6196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14300880#comment-14300880
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David Smiley commented on LUCENE-6196:
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I completely agree with Nick but was waiting to make my Spatial4j pitch :-)
Computational geometry has nothing to do with Lucene, but Lucene has a use for
tapping into computational geometry libs. I know on the dev list you mentioned
you only want to contribute this to Lucene but you didn't say the reason. I'm
guessing it's so that you needn't re-ask permission from your employer, whom
you may have agreements for a limited number of specific open-source projects.
If that's the case, you've already done your part and complied -- the code is
attached to this JIRA and has an ASL license. The license permits it to be
incorporated into any other ASL project (e.g. Spatial4j) with ease. I didn't
want to hinder you getting to this point.
> 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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