Karl Wright commented on LUCENE-8157:

Hi [~ivera], I probably will have a bit of time over the weekend to help with 

If you have code that insures non-coplanar points walking both ways around the 
polygon, please attach that to the ticket.  

> 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
>            Priority: Major
>         Attachments: LUCENE-8157-plane.patch, LUCENE-8157-test.patch, 
> LUCENE-8157.patch
> 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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