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https://issues.apache.org/jira/browse/LUCENE-8245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430401#comment-16430401
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Ignacio Vera commented on LUCENE-8245:
--------------------------------------
I checked the intersection point of the top edge with the travel plane and it
is numerically identical to the edge start point and still contributes with an
inner and outer crossing.
Maybe this idea is too naive but if we calculate all intersection points we can
assume the following:
1) if the intersection point is not numericaly identical to start and end
edges, then it should contribute with an inner and an outer crossing. (we don't
really need to calculate the crossings)
2) if the intersection point is numericaly identical to start or end edges,
then it should contribute with just an inner or an outer crossing. (we just
need to find out how to choose one...)
> GeoComplexPolygon fails when intersection of travel plane with edge is near
> polygon point
> -----------------------------------------------------------------------------------------
>
> Key: LUCENE-8245
> URL: https://issues.apache.org/jira/browse/LUCENE-8245
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial3d
> Reporter: Ignacio Vera
> Assignee: Karl Wright
> Priority: Major
> Fix For: 6.7, 7.4, master (8.0)
>
> Attachments: LUCENE-8245-case2.patch, LUCENE-8245.jpg,
> LUCENE-8245.patch
>
>
> When a travel plane crosses an edge close to an edge point , it is possible
> that the above and below planes crosses different edges. In the current
> implementation one of the crosses is missed because we only check edges that
> are crossed by the main plain and the {{within}} result is wrong.
> One possible fix is to check always the intersection of planes and edges
> regardless if they are crossed by main plane. That fixed the above issue but
> shows other issues like travel planes crossing two edges when it should be
> only one due to the fuzziness at edge intersections.
> Not sure of a fix so I add the test showing the issue.
>
>
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