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velipso
Polygon Union produces incorrect result
I have a case where when performing a union between to polygons where the result should be a doughnut shape, but the resulting polygon is completely filled.
This how the bigger polygon looks like:
The smaller polygon fills the missing piece on the track. What I expected is to get the complete track, what you get back is a completely filled shape.
Here are the points for the 2 polygons:
[[2796008.64832628, 333425.207920873], [2796007.03499144, 333431.259997593], [2796006.73954923, 333431.83983557], [2795999.27253848, 333445.988906098], [2795962.15502816, 333504.628835434], [2795963.28196301, 333505.350859358], [2795944.0748989, 333535.32264442], [2795871.62085854, 333651.640757779], [2795746.48419616, 333850.695125205], [2795736.09880924, 333868.881332771], [2795733.04605178, 333875.911888783], [2795730.83572409, 333882.964101318], [2795729.44088609, 333889.955644238], [2795728.74628529, 333897.824134068], [2795728.85525494, 333904.00936056], [2795729.76908333, 333912.341124962], [2795737.20384889, 333951.9332175], [2795737.30565133, 333952.575972848], [2795738.17681153, 333959.301411651], [2795737.38069225, 333966.48282041], [2795737.27888981, 333967.125575758], [2795734.04509632, 333974.892500239], [2795733.74965411, 333975.472338215], [2795723.52682623, 333988.469986966], [2795718.35987128, 333995.793124714], [2795606.45675451, 334172.546758759], [2795594.79923167, 334189.723561546], [2795563.02893866, 334230.997583318], [2795562.56877664, 334231.457745341], [2795554.56607344, 334239.139127599], [2795537.94206851, 334252.282248975], [2795529.49457203, 334260.016946758], [2795522.32456479, 334268.021114406], [2795512.93901584, 334280.609390501], [2795487.76313888, 334323.643931164], [2795471.73293785, 334348.630608586], [2795464.48846948, 334360.884754142], [2795458.90317081, 334371.925761292], [2795452.12267386, 334387.904526936], [2795451.82723165, 334388.484364912], [2795444.77792342, 334401.269637576], [2795225.77157185, 334750.960399843], [2795220.76106677, 334758.118773856], [2795215.3296282, 334764.460086763], [2795209.56576393, 334770.265462336], [2795209.10560191, 334770.725624359], [2795199.19391887, 334779.358586509], [2795195.00097342, 334784.803058442], [2795192.27344514, 334791.213170391], [2795190.84562656, 334799.942553383], [2795191.09813367, 334809.33495003], [2795192.91494662, 334820.463129733], [2795193.01674906, 334821.105885081], [2795192.96989956, 334824.93927199], [2795192.20238478, 334829.910211483], [2795192.10058233, 334830.552966831], [2795190.43545715, 334835.821185349], [2795187.58914691, 334842.11052285], [2795187.29370471, 334842.690360827], [2795177.76031327, 334859.810578134], [2795161.61976526, 334886.391697013], [2795145.87270405, 334908.333803526], [2795135.84060824, 334923.573346156], [2795083.51592182, 335007.747379794], [2794971.40807191, 335184.849988637], [2794925.59949378, 335259.703666636], [2794857.63790023, 335367.307465935], [2794674.57777531, 335660.632314422], [2794654.4562924, 335690.692744142], [2794639.65107464, 335708.813901674], [2794637.4761162, 335712.857099682], [2794628.91615444, 335732.137169466], [2794628.62071223, 335732.717007442], [2794616.27539864, 335753.525609198], [2794530.95812759, 335889.32676952], [2794461.06716593, 336001.641926197], [2794414.66797061, 336074.81447656], [2794265.62286505, 336315.176892708], [2794148.65681456, 336501.1117366], [2794127.77916591, 336536.463115305], [2794123.74076269, 336544.581531103], [2794120.47414264, 336552.629574806], [2794115.71556772, 336566.984145519], [2794103.66565767, 336611.863980495], [2794090.52998466, 336657.319099604], [2794085.14970894, 336672.253545649], [2794079.6328158, 336683.183880648], [2794079.33737359, 336683.763718625], [2794015.79590679, 336785.586097949], [2793998.86604457, 336811.546542464], [2793910.2715925, 336952.104793435], [2793833.83838893, 337074.482068228], [2793789.71622394, 337143.071734606], [2793712.53132262, 337269.248163929], [2793682.91506027, 337316.493506522], [2793675.14508326, 337328.013853827], [2793663.93042073, 337341.983185476], [2793652.71639214, 337353.322106472], [2793652.25623012, 337353.782268495], [2793633.28934057, 337370.064200683], [2793597.14741057, 337399.10539945], [2793588.39283385, 337407.958276045], [2793579.76537347, 337419.215575832], [2793562.50361221, 337444.698088895], [2793527.13601331, 337502.034377124], [2793523.79134175, 337506.303072934], [2793523.33117973, 337506.763234957], [2793519.75079381, 337510.2745172], [2793514.60059485, 337513.795149675], [2793514.02075687, 337514.090591881], [2793509.90563726, 337515.916025758], [2793503.67069607, 337517.520546664], [2793503.02794072, 337517.62234911], [2793495.20539438, 337518.227543182], [2793485.23964322, 337517.884159214], [2793471.28543083, 337516.569018905], [2793456.5398361, 337514.460565929], [2793455.89708075, 337514.358763483], [2793436.92361815, 337510.828358678], [2793417.06337547, 337506.69994132], [2793402.82814201, 337503.142828504], [2793390.29372775, 337498.906964192], [2793378.81711112, 337493.758949417], [2793378.23727315, 337493.463507211], [2793352.3473403, 337479.020692614], [2793325.22302875, 337462.709331566], [2793316.11455011, 337459.555378039], [2793308.77145153, 337458.533765425], [2793299.4834787, 337458.840520883], [2793289.11093218, 337460.566610771], [2793243.03336437, 337471.823525195], [2793227.93667118, 337475.97930775], [2793216.13681408, 337479.755603094], [2793203.52382194, 337484.641444305], [2793192.42135864, 337489.666084009], [2793181.31884013, 337495.714681756], [2793168.7840966, 337504.323127534], [2793156.50336154, 337514.540573331], [2793143.31558904, 337528.514882993], [2793131.31795361, 337543.59485787], [2793114.40314654, 337568.438783307], [2793032.94348996, 337692.221145819], [2792996.56769702, 337746.44114924], [2792974.89275643, 337778.253726275], [2792966.337972, 337788.561575134], [2792965.87780997, 337789.021737158], [2792957.79036098, 337796.200885894], [2792948.67253052, 337802.192948986], [2792948.09269254, 337802.488391192], [2792935.15515279, 337808.77016131], [2792925.51329019, 337812.180797671], [2792913.07957064, 337814.9695884], [2792912.43681529, 337815.071390846], [2792900.57993257, 337815.853112847], [2792892.83275434, 337815.256481458], [2792892.18999899, 337815.154679012], [2792881.92542646, 337812.417539558], [2792879.07396295, 337812.213979223], [2792877.44446576, 337812.527352285], [2792875.28386939, 337813.534668077], [2792872.02406522, 337816.762389446], [2792869.8269773, 337821.356047901], [2792867.72701843, 337829.642759777], [2792854.59902072, 337899.35080626], [2792853.10553424, 337914.964950297], [2792853.67869446, 337928.796759329], [2792852.91981357, 337935.644725911], [2792852.81801113, 337936.287481259], [2792850.90024616, 337942.224888858], [2792850.60480396, 337942.804726835], [2792846.8563546, 337950.092424338], [2792765.4140981, 338072.648412956], [2792716.8297161, 338144.412228056], [2792705.15267796, 338161.091925011], [2792687.23681332, 338184.806035897], [2792650.49115596, 338229.005510069], [2792639.17322439, 338241.32408454], [2792638.71306237, 338241.784246564], [2792631.88463137, 338246.711975847], [2792631.30479339, 338247.007418053], [2792624.46709053, 338250.116473424], [2792619.37791386, 338251.146770311], [2792618.73515852, 338251.248572757], [2792611.79001952, 338251.848894545], [2792607.88129727, 338253.114534855], [2792605.06648227, 338255.164408377], [2792602.28803563, 338258.570067106], [2792600.30198763, 338262.371088957], [2792598.62615761, 338267.290680557], [2792591.2573153, 338299.359587685], [2792585.11663759, 338321.451628331], [2792579.64696896, 338336.247184695], [2792572.3257004, 338351.55260003], [2792572.0302582, 338352.132438006], [2792557.61517388, 338376.504437868], [2792536.46513539, 338410.78663982], [2792491.05987886, 338481.891533096], [2792450.92623103, 338547.013611531], [2792432.06039751, 338575.670332066], [2792427.43774345, 338583.82096684], [2792424.73094772, 338590.057060462], [2792422.7781227, 338596.359038178], [2792421.50938216, 338602.52608409], [2792418.31620243, 338632.660369886], [2792418.21439999, 338633.303125234], [2792416.42952282, 338643.637234726], [2792412.86132093, 338653.865448185], [2792412.56587873, 338654.445286161], [2792404.15381485, 338669.960387585], [2792402.87142579, 338674.243725792], [2792402.540771, 338678.682212379], [2792403.67918437, 338684.62781231], [2792406.34981174, 338690.015556856], [2792410.19814338, 338694.891745797], [2792419.20534038, 338703.847890042], [2792419.66550241, 338704.308052065], [2792423.20915372, 338709.052435011], [2792425.19679124, 338712.742527436], [2792425.49223345, 338713.322365412], [2792427.30913776, 338718.325246926], [2792428.20240553, 338723.401750071], [2792428.30420797, 338724.044505419], [2792428.39512579, 338729.335115821], [2792427.68701982, 338734.560788532], [2792427.58521738, 338735.20354388], [2792425.11601452, 338743.569853734], [2792420.50987638, 338753.058275258], [2792420.21443418, 338753.638113235], [2792377.18078296, 338821.083783324], [2792374.02062998, 338827.537213765], [2792372.63384947, 338833.676097404], [2792372.77879117, 338837.728705952], [2792373.80562367, 338841.6986426], [2792375.81671901, 338845.764456138], [2792379.55135845, 338850.486652391], [2792387.83297911, 338857.682651507], [2792408.59343949, 338871.447919159], [2792409.05360151, 338871.908081183], [2792414.73782439, 338877.74085246], [2792416.75974226, 338881.067609059], [2792417.05518447, 338881.647447035], [2792418.63758676, 338885.696404758], [2792420.65959645, 338896.830498676], [2792420.7613989, 338897.473254024], [2792420.53912072, 338910.932195051], [2792415.72855907, 338981.626600385], [2792413.95852739, 339016.617147755], [2792411.65864688, 339044.380439391], [2792411.55684443, 339045.023194739], [2792409.62032987, 339055.187278153], [2792406.01643585, 339065.835295937], [2792401.06272073, 339076.159968504], [2792400.76727852, 339076.73980648], [2792394.84523505, 339085.680715247], [2792388.856545, 339092.494951368], [2792388.39638298, 339092.955113392], [2792382.79517879, 339098.205239012], [2792374.75281018, 339104.266620725], [2792367.96737999, 339108.216057652], [2792367.38754201, 339108.511499857], [2792360.18056519, 339111.673076358], [2792351.31542202, 339114.450213429], [2792342.18446572, 339116.384919013], [2792341.54171037, 339116.486721459], [2792333.86958991, 339117.403031366], [2792320.64034737, 339117.161100684], [2792319.99759202, 339117.059298238], [2792301.78752018, 339113.96021852], [2792241.5834484, 339097.18015838], [2792227.66612896, 339092.759817037], [2792214.7414311, 339087.681255853], [2792201.9516702, 339081.595739449], [2792201.37183222, 339081.300297244], [2792192.35398053, 339076.238960758], [2792079.65440932, 339005.18209796], [2792061.13337245, 338992.002585254], [2792057.20912892, 338988.233987057], [2792056.7489669, 338987.773825034], [2792052.8652857, 338983.10999085], [2792048.98267591, 338975.842643593], [2792048.6872337, 338975.262805617], [2792047.38203538, 338971.188841247], [2792046.4299641, 338965.832429632], [2792046.32816165, 338965.189674284], [2792046.2661665, 338960.066523711], [2792046.94315192, 338954.841336169], [2792047.04495437, 338954.19858082], [2792049.51301552, 338945.915619767], [2792054.21360257, 338936.203315434], [2792054.50904478, 338935.623477457], [2792078.98618772, 338896.999467331], [2792080.25062186, 338893.448979862], [2792080.7643246, 338889.948333437], [2792080.55388497, 338885.95723295], [2792079.61292528, 338882.152012946], [2792077.32963523, 338876.872062369], [2792073.89482217, 338870.87791454], [2792056.34753155, 338843.101251272], [2792015.24143595, 338775.636259824], [2791985.68214642, 338728.125186097], [2791976.78757509, 338715.424660026], [2791971.72211274, 338709.566844075], [2791965.56973378, 338704.270505893], [2791958.83876505, 338700.396942228], [2791953.20566913, 338698.506337809], [2791949.41751345, 338697.852775094], [2791944.32123537, 338697.627069874], [2791938.92981822, 338698.187450096], [2791918.74111918, 338703.201687904], [2791913.96301636, 338705.241881537], [2791909.47105784, 338708.275052692], [2791905.78402011, 338711.944110224], [2791901.22260128, 338718.178724353], [2791852.2059128, 338795.596731342], [2791840.27243974, 338813.143522271], [2791836.89968596, 338819.00463879], [2791831.42588988, 338830.954844481], [2791831.13044767, 338831.534682458], [2791828.74831605, 338835.201083782], [2791828.28815403, 338835.661245806], [2791823.84513241, 338839.273887227], [2791823.26529443, 338839.569329433], [2791820.913716, 338840.577111705], [2791817.30635835, 338841.177994361], [2791816.663603, 338841.279796807], [2791812.91406182, 338840.98325358], [2791812.27130647, 338840.881451134], [2791809.35801389, 338840.035662323], [2791808.77817591, 338839.740220117], [2791802.11689667, 338835.769643851], [2791773.05914965, 338808.163623504], [2791689.20580537, 338725.746137273], [2791651.75380736, 338689.950705851], [2791605.16493296, 338643.578301966], [2791576.41145311, 338616.310626963], [2791575.95129109, 338615.85046494], [2791564.24545677, 338604.067139696], [2791553.06865095, 338591.674462581], [2791546.03540499, 338582.858771454], [2791540.19770398, 338574.391851284], [2791520.66247878, 338540.489002894], [2791484.65951066, 338473.529716376], [2791484.36406846, 338472.9498784], [2791478.3318706, 338460.086401398], [2791473.88946243, 338448.138652035], [2791470.3744812, 338435.89363802], [2791467.59255597, 338421.445681478], [2791467.49075353, 338420.802926129], [2791463.59618651, 338388.765066058], [2791461.88242808, 338369.936696791], [2791459.49021567, 338325.46075541], [2791458.55894065, 338290.099891399], [2791458.67748527, 338267.290176752], [2791460.39389441, 338234.339889403], [2791463.72901009, 338212.772703657], [2791463.83081254, 338212.129948309], [2791469.29693871, 338189.943379225], [2791475.88922421, 338168.722474184], [2791479.79969339, 338158.245827937], [2791484.0362796, 338148.752476032], [2791485.0249164, 338145.144774765], [2791484.98720209, 338141.867746055], [2791483.67148571, 338138.329084286], [2791477.77732384, 338132.940892624], [2791477.31716182, 338132.4807306], [2791477.02171961, 338131.900892624], [2791475.30854547, 338128.522064717], [2791475.20674303, 338127.879309369], [2791474.92705891, 338122.921580814], [2791475.02886136, 338122.278825466], [2791476.4121329, 338114.710133753], [2791488.25708996, 338073.708378919], [2791495.12813784, 338052.350825164], [2791504.96784957, 338024.61946234], [2791519.75720351, 337987.067854903], [2791535.70700968, 337952.803906573], [2791536.00245189, 337952.224068596], [2791543.40128774, 337938.150845153], [2791551.63497487, 337923.834725771], [2791564.44730466, 337904.872003617], [2791598.15974332, 337859.738478182], [2791617.19490429, 337832.50956821], [2791637.52103334, 337800.258238841], [2791655.8725689, 337768.430705142], [2791661.53913617, 337757.621639315], [2791674.2803143, 337728.370891125], [2791689.77010203, 337688.925089191], [2791701.69218589, 337656.937065527], [2791708.1964745, 337643.21716749], [2791708.49191671, 337642.637329514], [2791715.38536048, 337632.30760815], [2791722.18722336, 337624.441357352], [2791722.64738538, 337623.981195329], [2791731.38431232, 337616.500900261], [2791739.50587302, 337611.560409854], 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the second piece
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I haven't tested the data but wanted to give you a response at least...
Are you sure you aren't just rendering it wrong? Polybooljs expects polygons to be combined in an even/odd rule. So if you have two parts of a track, and union them together, I would expect the result to be two large circles, one inside the other. The inner circle represents the inner border of the track. Using the even/odd rule, that would mean the inside isn't filled.
I suspected the rendering at first, but the the number of points returned is about 800 points less then than expected.
Returning less points could just mean it is combining colinear points. For example, this produces less points than what's provided:
