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https://issues.apache.org/jira/browse/LUCENE-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16352351#comment-16352351
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Karl Wright commented on LUCENE-8157:
-------------------------------------
I cannot look at this until much later in the week. Please wait until then
before going ahead with any solution.
Computing sidedness is, as you know, trivial when already-constructed planes
are involved. Please explain why precision is a problem when doing that. A
simple example should suffice.
> 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-test.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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