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https://issues.apache.org/jira/browse/MATH-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192076#comment-13192076
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Thomas Neidhart commented on MATH-668:
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I have checked the attached test cases:
- circle test: you remove the outer circle from the inner one, resulting in an
empty polygon set, which is correct behaviour. If you switch the two circles,
the correct result is returned: a PolygonsSet with two loops: the two circles
itself.
- testdifference2: the described behaviour is implementation specific due to
the way the hyperplane is cut when subtracting the two regions.
> 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
> Assignee: Luc Maisonobe
> Labels: difference, math,, polygon,
> Fix For: 3.0
>
> Attachments: PolygonsSetCircleTest.java, 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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