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https://issues.apache.org/jira/browse/LUCENE-8245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16432129#comment-16432129
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Ignacio Vera commented on LUCENE-8245:
--------------------------------------

The problem why the plane enters the polygon and never exists is because it 
reaches the intersection point. The actual travel plane is just outside of the 
polygon running in paralell (never crosses) and only the inner plane enters 
until the intersection point is reached.

what we currently do is to check for crossing of all travel planes if either 
the test plane or the check plane has an intersections. Maybe we need to 
separate this logic.

> 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, LUCENE-8245_Polygon.patch, LUCENE-8245_Random.patch, 
> LUCENE-8245_case3.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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