[geos-devel] reduced test for big nasty buffer

[strk]

The attached XML is a reduced version of the badguy.xml file.
It's reduced to a single MultiPolygon with 2 elements in it.
Running Buffer(0) on each element is fine, doing it
on both results in robustness problems.
Interesting enough, the two elements are disjoint !
Note also that using geomunion(1st, 2nd) is also fine.

Background for the list: we're tracking this before
releasing the final 3.0.0, so if you feel like helping
out you're welcome :)

--strk;

-------------- next part --------------
<run>
<!--precisionModel scale="1.0" offsetx="0.0" offsety="0.0"/-->
<precisionModel type="FLOATING"/>
<case>

<desc>
Extract from Big Bad Nasty buffer.
Note that buffer(0) on the two distinct elements in the MultiPoligon
work w/out problems. Also note that the two elements seems completely disjoint !
</desc>

<a>
 MULTIPOLYGON(

((3135840.75
 10098400,3135830.96130326 10098338.1966011,3135802.55339888
 10098282.4429495,3135758.30705046 10098238.1966011,3135702.55339888
 10098209.7886967,3135640.75 10098200,3135578.94660112
 10098209.7886967,3135523.19294954 10098238.1966011,3135478.94660112
 10098282.4429495,3135450.53869674 10098338.1966011,3135440.75
 10098400,3135450.53869674 10098461.8033989,3135478.94660112
 10098517.5570505,3135523.19294954 10098561.8033989,3135578.94660112
 10098590.2113033,3135640.75 10098600,3135702.55339888
 10098590.2113033,3135758.30705046 10098561.8033989,3135802.55339888
 10098517.5570505,3135830.96130326 10098461.8033989,3135840.75
 10098400))
,

 ((3129627.91469263 10098250.224858,3129626.69660112
 10098251.4429495,3129598.28869674 10098307.1966011,3129588.5
 10098369,3129598.28869674 10098430.8033989,3129626.69660112
 10098486.5570505,3129670.94294954 10098530.8033989,3129726.69660112
 10098559.2113033,3129788.5 10098569,3129810.4193904
 10098565.5283096,3129801 10098625,3129810.78869674
 10098686.8033989,3129839.19660112 10098742.5570505,3129883.44294954
 10098786.8033989,3129919.80510414 10098805.330842,3129934.69660112
 10098834.5570505,3129978.94294954 10098878.8033989,3130034.69660112
 10098907.2113033,3130096.5 10098917,3130158.30339888
 10098907.2113033,3130214.05705046 10098878.8033989,3130258.30339888
 10098834.5570505,3130266.10886759 10098819.2379556,3130311.19660112
 10098842.2113033,3130373 10098852,3130434.80339888
 10098842.2113033,3130490.55705046 10098813.8033989,3130534.80339888
 10098769.5570505,3130563.21130326 10098713.8033989,3130573
 10098652,3130563.21130326 10098590.1966011,3130544.90273925
 10098554.2640211,3130562.46130326 10098519.8033989,3130567.35775394
 10098488.888426,3130580.59936041 10098482.1414905,3130624.84570883
 10098437.8951421,3130653.25361321 10098382.1414905,3130663.04230996
 10098320.3380916,3130653.25361321 10098258.5346927,3130624.84570883
 10098202.7810411,3130580.59936041 10098158.5346927,3130524.84570883
 10098130.1267883,3130463.04230996 10098120.3380916,3130401.23891108
 10098130.1267883,3130390.18744187 10098135.7577932,3130393
 10098118,3130383.21130326 10098056.1966011,3130354.80339888
 10098000.4429495,3130344.48544933 10097990.125,3130369.05339888
 10097965.5570505,3130397.46130326 10097909.8033989,3130407.25
 10097848,3130398.37773376 10097791.9827156,3130424.80339888
 10097765.5570505,3130453.21130326 10097709.8033989,3130463
 10097648,3130453.21130326 10097586.1966011,3130424.80339888
 10097530.4429495,3130380.55705046 10097486.1966011,3130324.80339888
 10097457.7886967,3130263 10097448,3130201.19660112
 10097457.7886967,3130145.44294954 10097486.1966011,3130101.19660112
 10097530.4429495,3130072.78869674 10097586.1966011,3130069.4873263
 10097607.0406337,3130055.44294954 10097614.1966011,3130011.19660112
 10097658.4429495,3129982.78869674 10097714.1966011,3129973
 10097776,3129982.78869674 10097837.8033989,3130000.7008544
 10097872.9579877,3129962.94294954 10097892.1966011,3129918.69660112
 10097936.4429495,3129890.28869674 10097992.1966011,3129887.47014519
 10098009.9922353,3129867.44294954 10098020.1966011,3129831.00519077
 10098056.6343599,3129827 10098056,3129765.19660112
 10098065.7886967,3129709.44294954 10098094.1966011,3129665.19660112
 10098138.4429495,3129636.78869674 10098194.1966011,3129627.91469263
 10098250.224858)
, (3130240.39640351 10098310.4931472,3130210.44660112
 10098340.4429495,3130206.75048368 10098347.6969885,3130170.44294954
 10098366.1966011,3130160.73585624 10098375.9036944,3130136.55339888
 10098328.4429495,3130127.23544933 10098319.125,3130137.19853339
 10098309.1619159,3130193 10098318,3130240.39640351
 10098310.4931472)
)

)
</a>

<test>

  <!--op name="buffer" arg1="a" arg3="0.000000001"-->
  <op name="buffer" arg1="a" arg3="0">
GEOMETRYCOLLECTION EMPTY
  </op>

</test>
</case>
</run>