build123d clean() seam-face geometry loss: reproduction script + broken/workaround STEP pairs

cut_operator_broken.step

ISO-10303-21;
HEADER;
FILE_DESCRIPTION(('Open CASCADE Model'),'2;1');
FILE_NAME('Open CASCADE Shape Model','2026-08-25T14:28:32',('Author'),(
    'Open CASCADE'),'Open CASCADE STEP processor 7.9','build123d',
  'Unknown');
FILE_SCHEMA(('AUTOMOTIVE_DESIGN { 1 0 10303 214 1 1 1 1 }'));
ENDSEC;
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cut_workaround.step

ISO-10303-21;
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END-ISO-10303-21;

fuse_operator_broken.step

ISO-10303-21;
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END-ISO-10303-21;

fuse_workaround.step

ISO-10303-21;
HEADER;
FILE_DESCRIPTION(('Open CASCADE Model'),'2;1');
FILE_NAME('Open CASCADE Shape Model','2026-08-25T14:28:32',('Author'),(
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FILE_SCHEMA(('AUTOMOTIVE_DESIGN { 1 0 10303 214 1 1 1 1 }'));
ENDSEC;
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repro_clean_bug.py

"""Reproduction: the automatic clean() after boolean operations deletes
real geometry when the result contains a face crossed by a curved
surface's parametric seam.

Model: Sphere(5) and Box(8, 8, 8), both centered. The sphere pokes a
14.66 mm^3 spherical cap out of each of the six box faces.

    expected sphere - box = 6 caps           =  87.9646
    expected sphere + box = 523.60 + 512 - intersection = 599.9646

Observed (build123d 0.11.1, cadquery-ocp 7.9.3.1.1, macOS arm64):
`-` and `+` (and the .cut()/.fuse() methods) lose the cap crossed by the
sphere's parametric seam meridian; the fuse result additionally exports
to STEP as faces only (slicers read it as zero volume).

The boolean itself is sound: running the same operation through
BRepAlgoAPI directly gives the correct result, and calling .clean() on
that correct result reproduces the loss exactly -- isolating the bug to
the ShapeUpgrade_UnifySameDomain pass clean() wraps. Rotating the
sphere about Z moves the degenerate cap with the seam (0 deg -> +X,
90 deg -> +Y, 180 deg -> -X), and at 45 deg, where the seam points at a
box *edge* and crosses no cap face, the result is correct.

Workaround: run the raw boolean, then clean a *copy* and keep the clean
only when volume is conserved (note clean() mutates self.wrapped in
addition to returning, so the copy is required).
"""

import copy

from build123d import Box, Part, Rot, Shape, Sphere, export_step
from OCP.BRepAlgoAPI import BRepAlgoAPI_Cut, BRepAlgoAPI_Fuse
from OCP.TopTools import TopTools_ListOfShape

EXPECTED_CUT = 87.9646
EXPECTED_FUSE = 599.9646


def raw_bool(op, a: Shape, b: Shape) -> Part:
    """One OCCT boolean with no clean() afterwards."""
    args, tools = TopTools_ListOfShape(), TopTools_ListOfShape()
    args.Append(a.wrapped)
    tools.Append(b.wrapped)
    op.SetArguments(args)
    op.SetTools(tools)
    op.Build()
    return Part(op.Shape())


def guarded_clean(shape: Shape) -> Shape:
    """The proposed workaround/fix: keep clean() only when it conserves
    volume. clean() mutates in place, hence the copy."""
    before = shape.volume
    cleaned = copy.deepcopy(shape).clean()
    ok = abs(cleaned.volume - before) < 1e-9 * max(1.0, before)
    return cleaned if ok else shape


sphere, box = Sphere(5), Box(8, 8, 8)

print(f"{'operation':<26} {'volume':>10}   expected")
print(f"{'sphere - box (operator)':<26} {(sphere - box).volume:10.4f}   {EXPECTED_CUT}")
print(f"{'sphere + box (operator)':<26} {(sphere + box).volume:10.4f}   {EXPECTED_FUSE}")

raw_cut = raw_bool(BRepAlgoAPI_Cut(), sphere, box)
raw_fuse = raw_bool(BRepAlgoAPI_Fuse(), sphere, box)
print(f"{'raw BRepAlgoAPI_Cut':<26} {raw_cut.volume:10.4f}   {EXPECTED_CUT}")
print(f"{'raw BRepAlgoAPI_Fuse':<26} {raw_fuse.volume:10.4f}   {EXPECTED_FUSE}")

# clean() alone reproduces the loss on the correct raw results:
print(f"{'raw cut  -> .clean()':<26} {copy.deepcopy(raw_cut).clean().volume:10.4f}   (loss reproduced)")
print(f"{'raw fuse -> .clean()':<26} {copy.deepcopy(raw_fuse).clean().volume:10.4f}   (loss reproduced)")

# workaround: volume-guarded clean
print(f"{'guarded_clean(raw cut)':<26} {guarded_clean(raw_cut).volume:10.4f}   {EXPECTED_CUT}")
print(f"{'guarded_clean(raw fuse)':<26} {guarded_clean(raw_fuse).volume:10.4f}   {EXPECTED_FUSE}")

# the degenerate cap follows the seam as the sphere rotates:
print("\nseam location vs lost cap (sphere rotated about Z, then - box):")
for angle in (0, 90, 180, 45):
    d = (Rot(0, 0, angle) * Sphere(5)) - Box(8, 8, 8)
    dead = [x for x in d.solids() if x.volume < 1e-6]
    note = "correct (seam aimed at a box edge)" if not dead else (
        f"degenerate cap at ({dead[0].center().X:+.1f},"
        f"{dead[0].center().Y:+.1f},{dead[0].center().Z:+.1f})"
    )
    print(f"  {angle:3d} deg: volume {d.volume:8.4f}  {note}")

# STEP exports for visual comparison (broken vs workaround):
export_step(sphere - box, "cut_operator_broken.step")
export_step(guarded_clean(raw_cut), "cut_workaround.step")
export_step(sphere + box, "fuse_operator_broken.step")
export_step(guarded_clean(raw_fuse), "fuse_workaround.step")
print("\nwrote cut/fuse STEP pairs (operator vs workaround)")