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https://issues.apache.org/jira/browse/LUCENE-8239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426759#comment-16426759
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Ignacio Vera commented on LUCENE-8239:
--------------------------------------
There are two cases in the Patch:
1) Plane outside of the world: The check point is near a pole and one of the
travel planes chosen is the plane (almost) tangent to the world. The problem is
on method {{computeInsideOutside}} in the {{DualCrossingEdgeIterator }}
{code:java}
// Get the outside-outside intersection point
final GeoPoint[] outsideOutsidePoints =
testPointOutsidePlane.findIntersections(planetModel, travelOutsidePlane);
//these don't add anything: , checkPointCutoffPlane, testPointCutoffPlane);
final GeoPoint outsideOutsidePoint = pickProximate(outsideOutsidePoints);{code}
The travelOutsidePlane is actually outside of the world because travelPlane is
tangent and it cannot find any intersections. The method pickProximate throws
the following error:
{code:java}
if (points.length == 0) {
throw new IllegalArgumentException("No off-plane intersection points were
found; can't compute traversal");
}{code}
2) Degenerated vector: The test point is in one pole and checkpoint is near the
pole but not identical. The {{SectorLinearCrossingEdgeIterator}} tries to build
a plane with those two vectors essentially and throws an error as they are
almost parallel. In {{FullLinearCrossingEdgeIterator}} ocurrs the same.
> GeoComplexPolygon fails when test or/and check point are near a pole
> --------------------------------------------------------------------
>
> Key: LUCENE-8239
> URL: https://issues.apache.org/jira/browse/LUCENE-8239
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial3d
> Reporter: Ignacio Vera
> Priority: Major
> Attachments: LUCENE-8239.patch
>
>
> When calling {{within}} method in GeoComplexPolygon you can get errors if the
> test point of the polygon or the given point is near a pole.
> The reason is that one of the planes defined by these points is tangent to
> the world therefore intersection with the above plane fails. We should
> prevent navigating those planes ( we should not even construct them).
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