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https://issues.apache.org/jira/browse/LUCENE-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16359419#comment-16359419
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ASF subversion and git services commented on LUCENE-8157:
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Commit 98337f9af5075cc60ddcdd0e1751e9c7ab7d8895 in lucene-solr's branch
refs/heads/branch_7x from [[email protected]]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=98337f9 ]
LUCENE-8157: Do a better job of handling coplanar points in polygon
construction. Thanks to Ignacio Vera for his help on this code.
> GeoPolygon factory fails in recognize convex polygon
> ----------------------------------------------------
>
> Key: LUCENE-8157
> URL: https://issues.apache.org/jira/browse/LUCENE-8157
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial3d
> Reporter: Ignacio Vera
> Priority: Major
> Attachments: LUCENE-8157-plane.patch, LUCENE-8157-test.patch,
> LUCENE-8157-test.patch, LUCENE-8157.patch, LUCENE-8157.patch
>
>
> When a polygon contains three consecutive points which are nearly co-planar,
> the polygon factory may fail to recognize the concavity/convexity of the
> polygon. I think the problem is the way the sideness for a polygon edge is
> calculated. It relies in the position of the next point in respect of the
> previous polygon edge which fails on the case explained above because of
> numerical imprecision. The result is that sideness is messed up.
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