BooleanOp-Difference : result polygon's holes is not right, polytree is not right

[zengguang-xu]

subjects =
(-2600,-4247), (7400,-4247), (7400,5760), (-2600,5760), (-2600,-4247)

clips =
(-258,-605), (-1788,-605), (-1718,-674), (-488,-1905), (332,-1085), (-258,-1085), (-258,-605), (1005,-2843), (441,-3407), (1005,-3407), (1005,-2843), (545,-872), (332,-1085), (758,-1085), (545,-872), (27,-246), (241,-246), (241,-172), (27,-172), (27,-246), (-347,-249), (-287,-249), (-287,174), (-347,174), (-347,-249), (-347,257), (-729,257), (-729,-331), (-347,-331), (-347,-249), (-444,-249), (-444,174), (-504,174), (-504,-249), (-651,-249), (-651,174), (-347,174), (-347,257), (-102,-172), (-42,-172), (-42,126), (-102,126), (-102,-172), (241,-172), (301,-172), (301,126), (241,126), (241,-172), (-42,126), (241,126), (241,200), (-42,200), (-42,126), (555,-73), (1158,-73), (1158,181), (555,181), (555,-73), (1597,-2250), (1005,-2250), (1005,-2843), (1597,-2250), (1239,-1085), (758,-1085), (1239,-1566), (1239,-1085), (1239,-807), (1239,-1085), (1517,-1085), (1239,-807), (2165,-1085), (1517,-1085), (1841,-1409), (2165,-1085), (4146,-1015), (3574,-1015), (3860,-1301), (4146,-1015), (3164,-605), (3164,-1015), (3574,-1015), (3164,-605), (2773,-477), (2165,-1085), (2773,-1085), (2773,-477), (1942,-251), (2193,-251), (2193,333), (1942,333), (1942,-251), (2583,-123), (2793,-123), (2793,333), (2583,333), (2583,-123), (3521,243), (3521,-88), (3802,-88), (3802,-38), (3521,243), (3802,483), (3802,-38), (4012,-248), (4012,273), (3802,483), (3003,0), (3229,0), (3229,333), (3003,333), (3003,0), (-1296,1494), (-1790,1494), (-1790,1334), (-1438,1334), (-1438,896), (-1790,896), (-1790,1334), (-1969,1334), (-1969,829), (-1296,829), (-1296,1494), (-1882,1628), (-1584,1628), (-1584,1688), (-1882,1688), (-1882,1628), (-1240,743), (-1913,743), (-1913,78), (-1598,78), (-1598,-267), (-925,-267), (-925,398), (-1240,398), (-1240,676), (-1419,676), (-1419,238), (-1067,238), (-1067,-200), (-1419,-200), (-1419,238), (-1771,238), (-1771,676), (-1240,676), (-1240,743), (72,992), (-422,992), (-422,832), (-70,832), (-70,394), (-422,394), (-422,832), (-601,832), (-601,327), (72,327), (72,992), (-422,1497), (-1095,1497), (-1095,832), (-601,832), (-601,992), (-953,992), (-953,1430), (-601,1430), (-601,992), (-422,992), (-422,1497), (48,2270), (-625,2270), (-625,1605), (-222,1605), (-222,1161), (451,1161), (451,1826), (48,1826), (48,2203), (-131,2203), (-131,1765), (-43,1765), (-43,1666), (309,1666), (309,1228), (-43,1228), (-43,1666), (-131,1666), (-131,1765), (-483,1765), (-483,2203), (48,2203), (48,2270), (-1956,1688), (-1882,1688), (-1882,1971), (-1956,1971), (-1956,1688), (-1882,1971), (-1584,1971), (-1584,2031), (-1882,2031), (-1882,1971), (-1584,1757), (-1510,1757), (-1510,1971), (-1584,1971), (-1584,1757), (-724,2030), (-806,2030), (-806,1933), (-1229,1933), (-1229,2030), (-1312,2030), (-1312,1648), (-724,1648), (-724,1873), (-806,1873), (-806,1726), (-1229,1726), (-1229,1873), (-724,1873), (-724,2030), (-1229,2030), (-806,2030), (-806,2090), (-1229,2090), (-1229,2030), (1421,2115), (744,2115), (744,777), (1488,777), (1488,1079), (965,1079), (965,1930), (1421,1930), (1421,2115), (1158,181), (1728,181), (1728,408), (1158,408), (1158,181), (2193,333), (2583,333), (2583,574), (2193,574), (2193,333), (3102,1443), (2667,1443), (2667,1079), (1764,1079), (1764,771), (3102,771), (3102,1443), (2793,333), (3003,333), (3003,533), (2793,533), (2793,333), (3229,333), (3403,333), (3403,697), (3229,697), (3229,333), (4042,1295), (4042,1261), (4076,1261), (4042,1295), (1488,1079), (1764,1079), (1764,1556), (1488,1556), (1488,1079), (2062,2053), (2667,2053), (2667,2299), (2062,2299), (2062,2053), (2072,1443), (2667,1443), (2667,1735), (2072,1735), (2072,1443), (4042,1875), (3461,1875), (4042,1295), (4042,1875), (2667,1735), (3231,1735), (3231,2053), (2667,2053), (2667,1735), (4545,-615), (4146,-1015), (4545,-1015), (4545,-615), (6375,-579), (5782,-579), (6375,-1171), (6375,-579), (5218,-15), (5218,-579), (5782,-579), (5218,-15), (6015,2497), (4773,2497), (5133,2137), (5133,1660), (4282,1660), (4680,1261), (4076,1261), (4333,1004), (4012,1004), (4012,273), (4608,-323), (5449,518), (6335,518), (6335,1554), (6024,1865), (6035,1876), (5394,1876), (5610,1660), (5178,1660), (5394,1876), (6035,1876), (6504,2346), (5864,2346), (6015,2497), (1208,-4247), (1441,-4247), (1441,-4080), (1041,-4080), (1208,-4247), (-1128,-2290), (-1439,-2601), (-1920,-2121), (-1920,-2761), (-2071,-2610), (-2071,-3852), (-1711,-3492), (-1234,-3492), (-1234,-4247), (-1138,-4247), (-835,-3945), (-835,-4247), (519,-4247), (749,-4017), (-92,-3176), (-92,-3015), (-1234,-3015), (-1234,-3447), (-1450,-3231), (-1234,-3015), (-92,-3015), (-92,-2290), (-1128,-2290), (7400,-573), (7400,-422), (7249,-573), (7400,-573), (7400,664), (7400,1644), (6910,1154), (7400,664), (1600,5660), (1600,5760), (-2600,5760), (-2600,5660), (-2000,5660), (-2000,5160), (-2600,5160), (-2600,4960), (-2000,4960), (-2000,4360), (-2600,4360), (-2600,4160), (-2000,4160), (-2000,3660), (-2600,3660), (-2600,3460), (-2000,3460), (-2000,2860), (-1800,2860), (-1800,3460), (-1300,3460), (-1300,2860), (-1100,2860), (-1100,3460), (-600,3460), (-600,2860), (-400,2860), (-400,3460), (100,3460), (100,2860), (300,2860), (300,3460), (800,3460), (800,2860), (1000,2860), (1000,3460), (1600,3460), (1600,3660), (1000,3660), (1000,4160), (800,4160), (800,3660), (300,3660), (300,4160), (100,4160), (100,3660), (-400,3660), (-400,4160), (-600,4160), (-600,3660), (-1100,3660), (-1100,4160), (-1300,4160), (-1300,3660), (-1800,3660), (-1800,4160), (1600,4160), (1600,4360), (1000,4360), (1000,4860), (1600,4860), (1600,4960), (800,4960), (800,4360), (300,4360), (300,4960), (100,4960), (100,4360), (-400,4360), (-400,4960), (-600,4960), (-600,4360), (-1100,4360), (-1100,4960), (-1300,4960), (-1300,4360), (-1800,4360), (-1800,4960), (1600,4960), (1600,5060), (1000,5060), (1000,5560), (1600,5560), (1600,5660), (800,5660), (800,5160), (300,5160), (300,5660), (100,5660), (100,5160), (-400,5160), (-400,5660), (-600,5660), (-600,5160), (-1100,5160), (-1100,5660), (-1300,5660), (-1300,5160), (-1800,5160), (-1800,5660), (1600,5660), (5840,5760), (2240,5760), (2240,5600), (2840,5600), (2840,5100), (2240,5100), (2240,4900), (2840,4900), (2840,4300), (2240,4300), (2240,4100), (2840,4100), (2840,3600), (2240,3600), (2240,3400), (2840,3400), (2840,2800), (3040,2800), (3040,3400), (3540,3400), (3540,2800), (3740,2800), (3740,3400), (4240,3400), (4240,2800), (4440,2800), (4440,3400), (4940,3400), (4940,2800), (5140,2800), (5140,3400), (5640,3400), (5640,2800), (5840,2800), (5840,3400), (6440,3400), (6440,3600), (5840,3600), (5840,4100), (5640,4100), (5640,3600), (5140,3600), (5140,4100), (4940,4100), (4940,3600), (4440,3600), (4440,4100), (4240,4100), (4240,3600), (3740,3600), (3740,4100), (3540,4100), (3540,3600), (3040,3600), (3040,4100), (6440,4100), (6440,4300), (5840,4300), (5840,4800), (6440,4800), (6440,4900), (5640,4900), (5640,4300), (5140,4300), (5140,4900), (4940,4900), (4940,4300), (4440,4300), (4440,4900), (4240,4900), (4240,4300), (3740,4300), (3740,4900), (3540,4900), (3540,4300), (3040,4300), (3040,4900), (6440,4900), (6440,5000), (5840,5000), (5840,5500), (6440,5500), (6440,5600), (5640,5600), (5640,5100), (5140,5100), (5140,5600), (4940,5600), (4940,5100), (4440,5100), (4440,5600), (4240,5600), (4240,5100), (3740,5100), (3740,5600), (3540,5600), (3540,5100), (3040,5100), (3040,5600), (6440,5600), (6440,5700), (5840,5700), (5840,5760), (6920,5660), (7400,5660), (7400,5760), (6920,5760), (6920,5660), (6920,4960), (7400,4960), (7400,5160), (6920,5160), (6920,4960), (6920,4160), (7400,4160), (7400,4360), (6920,4360), (6920,4160), (6920,3460), (7400,3460), (7400,3660), (6920,3660), (6920,3460)

flow(pseudo code):
subjects = Clipper2Lib::Union(subjects, Clipper2Lib::FillRule::NonZero);
clips = Clipper2Lib::Union(clips, Clipper2Lib::FillRule::NonZero);

Clipper2Lib::PolyTreeD tree;
Clipper2Lib::BooleanOp(Clipper2Lib::ClipType::Difference, Clipper2Lib::FillRule::NonZero, subjects, clips, tree);

error:
the above result Clipper2Lib::PolyTreeD 'tree' is not right, A lot of holes were not identified，could you help me see how to resolve it??? thank you so much

[AngusJohnson]

I can't make head or tail of this question, mostly because the clip path seems somewhat nonsensical.
Consequently the solution isn't likely to be the intended one (irrespective of whether PolyTree or Paths64 is used):

I suggest you check the clip path is correct (which I think unlikely).
And it would really help if you specified the holes you're expecting that aren't being returned in the solution.
(Also, your 2 preliminary Union operations are superfluous.)

[zengguang-xu]

First of all, thank you very much for helping me with my question. Secondly, I am very sorry for giving you the wrong clip path, in fact, my clip path is a pile of polygons. Could you please help me take a look again? The process flow has not changed. and the correct subject and clips are as follows：

the subjects has only one polygon:
subjects = [(-2600,-4247), (7400,-4247), (7400,5760), (-2600,5760), (-2600,-4247)]

but the clips is composed of multiple polygons，every clip is a closed polygon：
clips = [
[(-258,-605), (-1788,-605), (-1718,-674), (-488,-1905), (332,-1085), (-258,-1085), (-258,-605)],
[(1005,-2843), (441,-3407), (1005,-3407), (1005,-2843)],
[(545,-872), (332,-1085), (758,-1085), (545,-872)],
[(27,-246), (241,-246), (241,-172), (27,-172), (27,-246)],
[(-347,-249), (-287,-249), (-287,174), (-347,174), (-347,-249)],
[(-347,257), (-729,257), (-729,-331), (-347,-331), (-347,-249), (-444,-249), (-444,174), (-504,174), (-504,-249), (-651,-249), (-651,174), (-347,174), (-347,257)],
[(-102,-172), (-42,-172), (-42,126), (-102,126), (-102,-172)],
[(241,-172), (301,-172), (301,126), (241,126), (241,-172)],
[(-42,126), (241,126), (241,200), (-42,200), (-42,126)],
[(555,-73), (1158,-73), (1158,181), (555,181), (555,-73)],
[(1597,-2250), (1005,-2250), (1005,-2843), (1597,-2250)],
[(1239,-1085), (758,-1085), (1239,-1566), (1239,-1085)],
[(1239,-807), (1239,-1085), (1517,-1085), (1239,-807)],
[(2165,-1085), (1517,-1085), (1841,-1409), (2165,-1085)],
[(4146,-1015), (3574,-1015), (3860,-1301), (4146,-1015)],
[(3164,-605), (3164,-1015), (3574,-1015), (3164,-605)],
[(2773,-477), (2165,-1085), (2773,-1085), (2773,-477)],
[(1942,-251), (2193,-251), (2193,333), (1942,333), (1942,-251)],
[(2583,-123), (2793,-123), (2793,333), (2583,333), (2583,-123)],
[(3521,243), (3521,-88), (3802,-88), (3802,-38), (3521,243)],
[(3802,483), (3802,-38), (4012,-248), (4012,273), (3802,483)],
[(3003,0), (3229,0), (3229,333), (3003,333), (3003,0)],
[(-1296,1494), (-1790,1494), (-1790,1334), (-1438,1334), (-1438,896), (-1790,896), (-1790,1334), (-1969,1334), (-1969,829), (-1296,829), (-1296,1494)],
[(-1882,1628), (-1584,1628), (-1584,1688), (-1882,1688), (-1882,1628)],
[(-1240,743), (-1913,743), (-1913,78), (-1598,78), (-1598,-267), (-925,-267), (-925,398), (-1240,398), (-1240,676), (-1419,676), (-1419,238), (-1067,238), (-1067,-200), (-1419,-200), (-1419,238), (-1771,238), (-1771,676), (-1240,676), (-1240,743)],
[(72,992), (-422,992), (-422,832), (-70,832), (-70,394), (-422,394), (-422,832), (-601,832), (-601,327), (72,327), (72,992)],
[(-422,1497), (-1095,1497), (-1095,832), (-601,832), (-601,992), (-953,992), (-953,1430), (-601,1430), (-601,992), (-422,992), (-422,1497)],
[(48,2270), (-625,2270), (-625,1605), (-222,1605), (-222,1161), (451,1161), (451,1826), (48,1826), (48,2203), (-131,2203), (-131,1765), (-43,1765), (-43,1666), (309,1666), (309,1228), (-43,1228), (-43,1666), (-131,1666), (-131,1765), (-483,1765), (-483,2203), (48,2203), (48,2270)],
[(-1956,1688), (-1882,1688), (-1882,1971), (-1956,1971), (-1956,1688)],
[(-1882,1971), (-1584,1971), (-1584,2031), (-1882,2031), (-1882,1971)],
[(-1584,1757), (-1510,1757), (-1510,1971), (-1584,1971), (-1584,1757)],
[(-724,2030), (-806,2030), (-806,1933), (-1229,1933), (-1229,2030), (-1312,2030), (-1312,1648), (-724,1648), (-724,1873), (-806,1873), (-806,1726), (-1229,1726), (-1229,1873), (-724,1873), (-724,2030)],
[(-1229,2030), (-806,2030), (-806,2090), (-1229,2090), (-1229,2030)],
[(1421,2115), (744,2115), (744,777), (1488,777), (1488,1079), (965,1079), (965,1930), (1421,1930), (1421,2115)],
[(1158,181), (1728,181), (1728,408), (1158,408), (1158,181)],
[(2193,333), (2583,333), (2583,574), (2193,574), (2193,333)],
[(3102,1443), (2667,1443), (2667,1079), (1764,1079), (1764,771), (3102,771), (3102,1443)],
[(2793,333), (3003,333), (3003,533), (2793,533), (2793,333)],
[(3229,333), (3403,333), (3403,697), (3229,697), (3229,333)],
[(4042,1295), (4042,1261), (4076,1261), (4042,1295)],
[(1488,1079), (1764,1079), (1764,1556), (1488,1556), (1488,1079)],
[(2062,2053), (2667,2053), (2667,2299), (2062,2299), (2062,2053)],
[(2072,1443), (2667,1443), (2667,1735), (2072,1735), (2072,1443)],
[(4042,1875), (3461,1875), (4042,1295), (4042,1875)],
[(2667,1735), (3231,1735), (3231,2053), (2667,2053), (2667,1735)],
[(4545,-615), (4146,-1015), (4545,-1015), (4545,-615)],
[(6375,-579), (5782,-579), (6375,-1171), (6375,-579)],
[(5218,-15), (5218,-579), (5782,-579), (5218,-15)],
[(6015,2497), (4773,2497), (5133,2137), (5133,1660), (4282,1660), (4680,1261), (4076,1261), (4333,1004), (4012,1004), (4012,273), (4608,-323), (5449,518), (6335,518), (6335,1554), (6024,1865), (6035,1876), (5394,1876), (5610,1660), (5178,1660), (5394,1876), (6035,1876), (6504,2346), (5864,2346), (6015,2497)],
[(1208,-4247), (1441,-4247), (1441,-4080), (1041,-4080), (1208,-4247)],
[(-1128,-2290), (-1439,-2601), (-1920,-2121), (-1920,-2761), (-2071,-2610), (-2071,-3852), (-1711,-3492), (-1234,-3492), (-1234,-4247), (-1138,-4247), (-835,-3945), (-835,-4247), (519,-4247), (749,-4017), (-92,-3176), (-92,-3015), (-1234,-3015), (-1234,-3447), (-1450,-3231), (-1234,-3015), (-92,-3015), (-92,-2290), (-1128,-2290)],
[(7400,-573), (7400,-422), (7249,-573), (7400,-573)],
[(7400,664), (7400,1644), (6910,1154), (7400,664)],
[(1600,5660), (1600,5760), (-2600,5760), (-2600,5660), (-2000,5660), (-2000,5160), (-2600,5160), (-2600,4960), (-2000,4960), (-2000,4360), (-2600,4360), (-2600,4160), (-2000,4160), (-2000,3660), (-2600,3660), (-2600,3460), (-2000,3460), (-2000,2860), (-1800,2860), (-1800,3460), (-1300,3460), (-1300,2860), (-1100,2860), (-1100,3460), (-600,3460), (-600,2860), (-400,2860), (-400,3460), (100,3460), (100,2860), (300,2860), (300,3460), (800,3460), (800,2860), (1000,2860), (1000,3460), (1600,3460), (1600,3660), (1000,3660), (1000,4160), (800,4160), (800,3660), (300,3660), (300,4160), (100,4160), (100,3660), (-400,3660), (-400,4160), (-600,4160), (-600,3660), (-1100,3660), (-1100,4160), (-1300,4160), (-1300,3660), (-1800,3660), (-1800,4160), (1600,4160), (1600,4360), (1000,4360), (1000,4860), (1600,4860), (1600,4960), (800,4960), (800,4360), (300,4360), (300,4960), (100,4960), (100,4360), (-400,4360), (-400,4960), (-600,4960), (-600,4360), (-1100,4360), (-1100,4960), (-1300,4960), (-1300,4360), (-1800,4360), (-1800,4960), (1600,4960), (1600,5060), (1000,5060), (1000,5560), (1600,5560), (1600,5660), (800,5660), (800,5160), (300,5160), (300,5660), (100,5660), (100,5160), (-400,5160), (-400,5660), (-600,5660), (-600,5160), (-1100,5160), (-1100,5660), (-1300,5660), (-1300,5160), (-1800,5160), (-1800,5660), (1600,5660)],
[(5840,5760), (2240,5760), (2240,5600), (2840,5600), (2840,5100), (2240,5100), (2240,4900), (2840,4900), (2840,4300), (2240,4300), (2240,4100), (2840,4100), (2840,3600), (2240,3600), (2240,3400), (2840,3400), (2840,2800), (3040,2800), (3040,3400), (3540,3400), (3540,2800), (3740,2800), (3740,3400), (4240,3400), (4240,2800), (4440,2800), (4440,3400), (4940,3400), (4940,2800), (5140,2800), (5140,3400), (5640,3400), (5640,2800), (5840,2800), (5840,3400), (6440,3400), (6440,3600), (5840,3600), (5840,4100), (5640,4100), (5640,3600), (5140,3600), (5140,4100), (4940,4100), (4940,3600), (4440,3600), (4440,4100), (4240,4100), (4240,3600), (3740,3600), (3740,4100), (3540,4100), (3540,3600), (3040,3600), (3040,4100), (6440,4100), (6440,4300), (5840,4300), (5840,4800), (6440,4800), (6440,4900), (5640,4900), (5640,4300), (5140,4300), (5140,4900), (4940,4900), (4940,4300), (4440,4300), (4440,4900), (4240,4900), (4240,4300), (3740,4300), (3740,4900), (3540,4900), (3540,4300), (3040,4300), (3040,4900), (6440,4900), (6440,5000), (5840,5000), (5840,5500), (6440,5500), (6440,5600), (5640,5600), (5640,5100), (5140,5100), (5140,5600), (4940,5600), (4940,5100), (4440,5100), (4440,5600), (4240,5600), (4240,5100), (3740,5100), (3740,5600), (3540,5600), (3540,5100), (3040,5100), (3040,5600), (6440,5600), (6440,5700), (5840,5700), (5840,5760)],
[(6920,5660), (7400,5660), (7400,5760), (6920,5760), (6920,5660)],
[(6920,4960), (7400,4960), (7400,5160), (6920,5160), (6920,4960)],
[(6920,4160), (7400,4160), (7400,4360), (6920,4360), (6920,4160)],
[(6920,3460), (7400,3460), (7400,3660), (6920,3660), (6920,3460)]
]

[zengguang-xu]

and the processed result is as follows. It can be seen that many holes are overlapped as polygons：