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https://issues.apache.org/jira/browse/MATH-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102737#comment-13102737
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Curtis Jensen commented on MATH-668:
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Never mind on testdifference1. I think I see the problem (bottom left corner
of outer polygon is ambiguous). I'll work on creating a better example.
Though, testdifference2 is still an interesting case.
> Polygon difference function produces erroneous results with certain polygons
> ----------------------------------------------------------------------------
>
> Key: MATH-668
> URL: https://issues.apache.org/jira/browse/MATH-668
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: Curtis Jensen
> Labels: difference, math,, polygon,
> Attachments: PolygonsSetTest.java
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> For some polygons, the difference function produces erroneous results. This
> appears to happen when one polygon is completely encompassed in another, and
> the outer has multiple concave sections.
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