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https://issues.apache.org/jira/browse/LUCENE-8281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16455786#comment-16455786
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Ignacio Vera commented on LUCENE-8281:
--------------------------------------
This might be useful and it is something I noticed when developing the random
test. If I construct the testpoint2 in the following way:
{code:java}
// Pick the antipodes for testPoint2
GeoPoint p = new GeoPoint(-testPoint.x, -testPoint.y, -testPoint.z);
this.testPoint2 = new GeoPoint(planetModel, p.getLatitude(),
p.getLongitude());{code}
Then we get:
{code:java}
Finding whether
[-1.0011188539790565,-5.132245021424039E-6,-7.291706183250981E-7] is in-set,
based on travel from [X=1.0011188539790565, Y=5.132245021274452E-6,
Z=-7.291706183250981E-7] along [A=0.0, B=0.0; C=1.0; D=7.291706183250981E-7]
(value=-7.291706183250981E-7)
Constructing sector linear crossing edge iterator
Edge [[lat=7.4E-323, lon=0.0([X=1.0011188539924791, Y=0.0, Z=7.4E-323])] -->
[lat=-1.2617196632339242E-5, lon=-1.5701544210600105E-5([X=1.001118853788849,
Y=-1.5719111944122703E-5, Z=-1.2631313432823315E-5])]] potentially crosses
travel plane [A=0.0, B=0.0; C=1.0; D=7.291706183250981E-7]
There were intersection points!
Edge [[lat=7.4E-323, lon=0.0([X=1.0011188539924791, Y=0.0, Z=7.4E-323])] -->
[lat=-1.2617196632339242E-5, lon=-1.5701544210600105E-5([X=1.001118853788849,
Y=-1.5719111944122703E-5, Z=-1.2631313432823315E-5])]] intersects travel plane
[A=0.0, B=0.0; C=1.0; D=7.291706183250981E-7]
Edge [[lat=-2.8213942160840002E-6,
lon=1.608008770581648E-5([X=1.0011188538590383, Y=1.60980789753873E-5,
Z=-2.8245509442632E-6])] --> [lat=3.8977187534179774E-6,
lon=1.9713406091526057E-5([X=1.0011188537902969, Y=1.9735462513207743E-5,
Z=3.902079731596721E-6])]] potentially crosses travel plane [A=0.0, B=0.0;
C=1.0; D=7.291706183250981E-7]
There are no intersection points within bounds.
Endpoint(s) of edge are not on travel plane
Check point in set? false{code}
Which is the right answer. Looking at the differences:
{code:java}
Case 1) Failing
test point2 ([X=-1.0011188539790565, Y=-5.132245021274452E-6,
Z=-7.291706183250981E-7]):
Constructing sector linear crossing edge iterator with bounds:
bound1:[A=5.126509205983227E-6, B=-0.9999999999868595, C=0.0, D=0.0,
side=-1.0]
bound2:[A=-5.126509205983227E-6, B=0.9999999999868595, C=0.0, D=0.0,
side=-1.0]
Case 2) Success
test point2 ([lat=-7.283556946482617E-7,
lon=-3.141587527080587([X=-1.0011188539790565, Y=-5.132245021424039E-6,
Z=-7.291706183250981E-7])]):
Constructing sector linear crossing edge iterator with bounds:
bound1:[A=7.283556946481974E-7, B=0.0, C=-0.9999999999997348, D=0.0,
side=-1.0]
bound2:[A=4.983019447078322E-6, B=0.0, C=-0.9999999999875847, D=0.0,
side=1.0]{code}
So clearly bounds for the iterator are totally messed up.
> Random polygon test failures
> ----------------------------
>
> Key: LUCENE-8281
> URL: https://issues.apache.org/jira/browse/LUCENE-8281
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial3d
> Reporter: Karl Wright
> Assignee: Karl Wright
> Priority: Major
> Attachments: LUCENE-8281-debugging.patch, LUCENE-8281.jpg
>
>
> Reproduce here:
> {code}
> ant test -Dtestcase=RandomGeoPolygonTest
> -Dtests.method=testCompareSmallPolygons -Dtests.seed=42573983280EE568
> -Dtests.multiplier=3 -Dtests.slow=true -Dtests.locale=jmc-TZ
> -Dtests.timezone=US/Alaska -Dtests.asserts=true -Dtests.file.encoding=US-ASCII
> {code}
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