def test_init_from_sdl():
"""Test the initalization of LineSegment3D from start, direction, length."""
pt = Point3D(2, 0, 2)
vec = Vector3D(0, 1, 0)
seg = LineSegment3D.from_sdl(pt, vec, 2)
assert seg.p == Point3D(2, 0, 2)
assert seg.v == Vector3D(0, 2, 0)
assert seg.p1 == Point3D(2, 0, 2)
assert seg.p2 == Point3D(2, 2, 2)
assert seg.length == 2
def test_subdivide_tolerance_issue():
"""Test the LineSegment3D subdivide method handles Python tolerance.
This case was taken from an originally failing situation in Rhino.
"""
origin = Point3D(-68.773857131759087, 20.836167334772536,
18.897600000000001)
dir = Vector3D(-0.026879795220556984, -0.99963867302585929, 0.0)
bottom_seg = LineSegment3D.from_sdl(origin, dir, 21.5037894118)
assert len(bottom_seg.subdivide_evenly(5)) == 6
assert len(bottom_seg.subdivide_evenly(7)) == 8