H2GIS uses TINFour instead of Poly2Tri to build delaunay and constrained delaunay triangulation.
TINFour does not seem as robust as JTS's internal algorithm.
SELECT ST_CONSTRAINEDDELAUNAY('
Polygon ((499662.20188129047164693 5903035.14385868608951569, 499664.69616801862139255 5903041.20664007496088743, 499665.19389279064489529 5903042.41520992014557123, 499677.44525798101676628 5903037.45674110855907202, 499681.03928913356503472 5903035.9991489490494132, 499696.74218779936200008 5903029.50130494311451912, 499734.68937357823597267 5903014.04685074556618929, 499738.76361172302858904 5903014.50273820757865906, 499742.55117823992623016 5903016.02661534678190947, 499745.17854437668574974 5903018.51840585097670555, 499747.37249031406827271 5903021.17709119152277708, 499799.91617149574449286 5902999.24782232195138931, 499798.22225900599732995 5902994.33077867422252893, 499799.93588404898764566 5902992.29488732852041721, 499802.22283026343211532 5902986.87706564087420702, 499818.7529803208890371 5902978.45494890119880438, 499870.81724471267079934 5902953.92331695184111595, 499971.84658290253719315 5902903.42672632727771997, 500000.52684675541240722 5902889.23150093760341406, 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501189.49526835209690034 5902939.53002986591309309, 501238.69774069270351902 5902948.23093840386718512, 501273.57056254660710692 5902956.01632851548492908, 501324.32294270541751757 5902977.1448296494781971, 501391.88762546656653285 5903012.89660168252885342, 501444.50160578545182943 5903048.32216334249824286, 501542.56937810475938022 5903128.81782605219632387, 501552.83851105516077951 5903147.76652120146900415, 501608.8727920723031275 5903195.93280160240828991, 501587.04879303724737838 5903276.37931275554001331, 501451.62929134775185958 5903159.84955314174294472, 501409.60450643947115168 5903126.59620788786560297, 501355.41156323225004598 5903158.88661153241991997, 501222.14526025811210275 5903138.97074250411242247, 501190.96681140922009945 5903109.0707882372662425, 501156.17709651886252686 5903148.48815002012997866, 501245.73625699093099684 5903190.56207488663494587, 501166.69450227479683235 5903248.87999289482831955, 501152.7771405719104223 5903255.94079062715172768, 501105.74200972885591909 5903230.17596769426018, 501101.48347316950093955 5903220.69673810433596373, 501102.45919521170435473 5903211.09634860791265965, 501094.90529651788529009 5903207.81282122246921062, 501090.76665821595815942 5903198.68961944151669741, 501085.40496074658585712 5903201.97018150147050619, 501078.82167872262652963 5903211.33568312413990498, 501070.17312011413741857 5903213.035812315531075, 501065.29744323703926057 5903219.72066405043005943, 501059.80696371634257957 5903232.60184144042432308, 501051.64316245430381969 5903243.53561241924762726, 501044.82185676629887894 5903244.26834235992282629, 501039.32071853842353448 5903245.25723783764988184, 500971.79269507963908836 5903326.72042909171432257, 500890.94774767570197582 5903431.36568562407046556, 500775.22974622447509319 5903368.6800133129581809, 500780.72120398242259398 5903384.87847481016069651, 500812.85513163008727133 5903407.43361727613955736, 500800.69141000555828214 5903419.92459850572049618, 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500211.30826299166074023 5904307.95869273226708174, 500209.55495889240410179 5904309.49382676184177399, 500161.56293282611295581 5904351.5210941769182682, 500129.37084455188596621 5904380.48892082646489143, 500166.71441763598704711 5904393.37250477634370327, 500172.64071579970186576 5904391.5260126069188118, 500195.29199507291195914 5904401.2498910166323185, 500220.8372660277527757 5904389.95941753778606653, 500235.84804446273483336 5904419.50738912727683783, 500279.49879896966740489 5904403.15644794888794422, 500312.19068238441832364 5904390.17586829606443644, 500368.74814394547138363 5904368.78710617963224649, 500381.33850858098594472 5904395.13142968714237213, 500433.13682086742483079 5904371.62932773027569056, 500460.35300728562287986 5904391.68974644131958485, 500517.62951962102670223 5904446.6072367699816823, 500536.71822413831250742 5904473.35317451693117619, 500565.35174368566367775 5904506.18553489353507757, 500562.51154145615873858 5904510.23459688946604729, 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500926.14831012667855248 5904686.50700551178306341, 500914.72277998150093481 5904688.61849547363817692, 500891.60699780366849154 5904682.80700747482478619, 500872.55208230233984068 5904669.00882246624678373, 500838.37262000789633021 5904653.5726940929889679))
'::GEOMETRY) as the_geom;
H2GIS uses TINFour instead of Poly2Tri to build delaunay and constrained delaunay triangulation.
TINFour does not seem as robust as JTS's internal algorithm.
returns
JTS rocks !
@nicolas-f