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https://issues.apache.org/jira/browse/LUCENE-8556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16673547#comment-16673547
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Lucene/Solr QA commented on LUCENE-8556:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
19s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Release audit (RAT) {color} | 
{color:green}  1m 18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Check forbidden APIs {color} | 
{color:green}  1m 18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Validate source patterns {color} | 
{color:green}  1m 18s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  8m 
29s{color} | {color:green} sandbox in the patch passed. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 14m 17s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | LUCENE-8556 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12946652/LUCENE-8556.patch |
| Optional Tests |  compile  javac  unit  ratsources  checkforbiddenapis  
validatesourcepatterns  |
| uname | Linux lucene2-us-west.apache.org 4.4.0-112-generic #135-Ubuntu SMP 
Fri Jan 19 11:48:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | ant |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-LUCENE-Build/sourcedir/dev-tools/test-patch/lucene-solr-yetus-personality.sh
 |
| git revision | master / 31d7dfe |
| ant | version: Apache Ant(TM) version 1.9.6 compiled on July 20 2018 |
| Default Java | 1.8.0_172 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-LUCENE-Build/117/testReport/ |
| modules | C: lucene/sandbox U: lucene/sandbox |
| Console output | 
https://builds.apache.org/job/PreCommit-LUCENE-Build/117/console |
| Powered by | Apache Yetus 0.7.0   http://yetus.apache.org |


This message was automatically generated.



> Tesselator: Polygons may fail when using Morton optimisation
> ------------------------------------------------------------
>
>                 Key: LUCENE-8556
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8556
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/sandbox
>    Affects Versions: 7.6, master (8.0)
>            Reporter: Ignacio Vera
>            Priority: Blocker
>         Attachments: LUCENE-8556.patch, image-2018-11-02-08-48-12-898.png
>
>
> I experience some errors when processing complex polygons. I realised that if 
> I disable the Morton optimisation, then the errors go away.
> I studied one of the cases and it seems that when using the optimisation, it 
> is possible to create triangles with points inside of them (see picture 
> attached). There is a point just on the edge of the triangle. When disabling 
> the optimisation, such a triangle is not created.
>  



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