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https://issues.apache.org/jira/browse/LUCENE-8257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440467#comment-16440467
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Ignacio Vera commented on LUCENE-8257:
--------------------------------------
One thing I notice is that the start and end plane for that edge are
functionally identical. Maybe that condition can be used to check the need for
a backing side.
> GeoComplexPolygon fails when points are near identical
> ------------------------------------------------------
>
> Key: LUCENE-8257
> URL: https://issues.apache.org/jira/browse/LUCENE-8257
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial3d
> Reporter: Ignacio Vera
> Assignee: Karl Wright
> Priority: Major
> Attachments: LUCENE-8257.patch
>
>
> When a polygon have two consecutive points very close to each other but not
> numerically identical, we can get wrong results because planes defining that
> edge intersects somewhere else on the world. At that point the following
> check is evaluated to true:
> {code:java}
> if (edge.plane.evaluateIsZero(thePointX, thePointY, thePointZ) &&
> edge.startPlane.isWithin(thePointX, thePointY, thePointZ) &&
> edge.endPlane.isWithin(thePointX, thePointY, thePointZ)) {
> return false;
> }{code}
>
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