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Posted to dev@lucene.apache.org by "Ignacio Vera (JIRA)" <ji...@apache.org> on 2018/02/05 10:56:01 UTC

[jira] [Created] (LUCENE-8157) GeoPolygon factory fails in recognize convex polygon

Ignacio Vera created LUCENE-8157:
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             Summary: GeoPolygon factory fails in recognize convex polygon
                 Key: LUCENE-8157
                 URL: https://issues.apache.org/jira/browse/LUCENE-8157
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/spatial3d
            Reporter: Ignacio Vera


When a polygon contains three consecutive points which are nearly co-planar, the polygon factory may fail to recognize the concavity/convexity of the polygon. I think the problem is the way the sideness for a polygon edge is calculated. It relies in the position of the next point in respect of the previous polygon edge which fails on the case explained above because of numerical imprecision. The result is that sideness is messed up.



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