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https://issues.apache.org/jira/browse/MATH-1060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817236#comment-13817236
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Luc Maisonobe commented on MATH-1060:
-------------------------------------
Such cases may occur when the lines that form the polygon boundaries are almost
parallel and intersection location cannot be computed reliably. This is a
numerical issue due to limited accuracy of double precision numbers.
We cannot do anything about this without a way to reproduce the error. If you
could provide us a test case reproducing it (a small one if possible), we could
look at it.
> MathInternalError when calculating barycenter of PolyhedronsSet
> ---------------------------------------------------------------
>
> Key: MATH-1060
> URL: https://issues.apache.org/jira/browse/MATH-1060
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.2
> Environment: Ubuntu, Java 1.7.0
> Reporter: Ian Perera
> Priority: Minor
>
> I'm not sure if I could replicate this well enough to be useful - I am trying
> to construct a PolyhedronsSet from a collection of Planes using
> RegionFactory.buildConvex(). The input planes are created from running QHull
> - I don't have the actual normals but I can add them to this report if I run
> into this again.
> Exception in thread "KQML-Dispatcher-1"
> org.apache.commons.math3.exception.MathInternalError: illegal state: internal
> error, please fill a bug report at https://issues.apache.org/jira/browse/MATH
> at
> org.apache.commons.math3.geometry.euclidean.twod.PolygonsSet.followLoop(PolygonsSet.java:736)
> at
> org.apache.commons.math3.geometry.euclidean.twod.PolygonsSet.getVertices(PolygonsSet.java:613)
> at
> org.apache.commons.math3.geometry.euclidean.twod.PolygonsSet.computeGeometricalProperties(PolygonsSet.java:523)
> at
> org.apache.commons.math3.geometry.partitioning.AbstractRegion.getSize(AbstractRegion.java:413)
> at
> org.apache.commons.math3.geometry.euclidean.threed.PolyhedronsSet$FacetsContributionVisitor.addContribution(PolyhedronsSet.java:188)
> at
> org.apache.commons.math3.geometry.euclidean.threed.PolyhedronsSet$FacetsContributionVisitor.visitInternalNode(PolyhedronsSet.java:170)
> at
> org.apache.commons.math3.geometry.partitioning.BSPTree.visit(BSPTree.java:263)
> at
> org.apache.commons.math3.geometry.partitioning.BSPTree.visit(BSPTree.java:262)
> at
> org.apache.commons.math3.geometry.partitioning.BSPTree.visit(BSPTree.java:262)
> at
> org.apache.commons.math3.geometry.euclidean.threed.PolyhedronsSet.computeGeometricalProperties(PolyhedronsSet.java:135)
> at
> org.apache.commons.math3.geometry.partitioning.AbstractRegion.getBarycenter(AbstractRegion.java:428)
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