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Posted to issues@lucene.apache.org by "Ignacio Vera (Jira)" <ji...@apache.org> on 2020/02/26 11:00:00 UTC

[jira] [Created] (LUCENE-9251) Polygon tessellator fails to detect some collinear points

Ignacio Vera created LUCENE-9251:
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             Summary: Polygon tessellator fails to detect some collinear points
                 Key: LUCENE-9251
                 URL: https://issues.apache.org/jira/browse/LUCENE-9251
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Ignacio Vera


A user of Elasticsearch [has reported| https://discuss.elastic.co/t/unable-to-tessellate-shape-error-on-indexing-es-7-6/220867] a tessellation error in a valid polygon. The reported polygon is quite complex but after digging a bit, the problem is the tesselator fails to detect some colinearities. In particular, in complex tessellation we can end up with two equal edges with different flag in {{isEdgeFromPolygon}}. Still we should be able to remove that co-linearity.



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