fix(geometry): resolve IfcHalfSpaceSolid subtypes at the clipping gate - #60
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📝 WalkthroughWalkthroughGeometry processing now recognizes bounded half-space subtypes for clipping and tessellates face-based surface models. Tests cover successful processing and fallback cases. Coverage documentation and parity baselines report updated counts for ChangesGeometry fallback handling
Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: 🟡 Moderate · up to Some bounded clips can produce bounds tighter than the actual geometry, and partially tessellated face-based models can be treated as complete. Resolve those geometry risks before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@geometry/clip.go`:
- Around line 152-154: Update the footprint validation gate in the clipping
function to accept only polygons verified to match the AABB rectangle; remove
the relative-area tolerance that admits real area deficits, and decline
ambiguous boundaries so clipping falls back to the OBB path.
In `@geometry/geometry.go`:
- Around line 131-132: Update surfaceModelMesh handling for attrFbsmFaces so it
reports success only when every required connected face set and face is fully
tessellated, including supported loop types; if any required part is
unsupported, decline the whole model so this dispatch does not return partial
geometry as SourceBrep and the fallback can run.
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docs/coverage.mdgeometry/bbox.gogeometry/brep.gogeometry/brep_test.gogeometry/clip.gogeometry/clip_test.gogeometry/geometry.gogeometry/testdata/synthetic/clipped_by_bounded_halfspace.ifcgeometry/testdata/synthetic/clipped_by_triangular_halfspace.ifcgeometry/testdata/synthetic/face_based_surface_model.ifcgeometry/unhandled.goparity/testdata/baseline.json
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@geometry/clip.go`:
- Line 161: Update polyArea to compute the shoelace sum relative to poly[0],
subtracting that vertex’s coordinates from each edge endpoint before calculating
cross products. Keep the existing area threshold and clipMeshByDifference
fallback behavior unchanged.
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geometry/clip.gogeometry/clip_test.go
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clipMeshByDifference gated its second operand on IsA("IfcHalfSpaceSolid").
IsA matches the exact type keyword — there is no EXPRESS schema — so the
subtype IfcPolygonalBoundedHalfSpace never passed and the bounded-clipping
path below it was dead code on all 11 corpus instances. It is Revit's standard
mitred wall/slab/beam join, so the cost is paid on ordinary models.
unhandled.go gated on the same keyword and moves in the same commit: with only
the clip fixed, the generated coverage page would keep reporting a gap that no
longer exists. bbox.go already enumerated all three keywords by hand and now
shares the predicate, so the package holds one answer rather than two that had
already drifted apart.
Refs #52
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
isHalfSpaceSolid was spliced into the middle of clipMeshByDifference's doc comment block, so Go attached the whole combined comment to the predicate and left clipMeshByDifference undocumented. Move the predicate above the block so each function keeps its own doc. No behaviour change. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Regenerated by `make parity-report` and `make parity-baseline` after the subtype predicate made the bounded-clipping path reachable. Gate 2 fails in both directions by design, so a closed gap has to be recorded rather than silently improving the numbers. Closes #52 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
clipTrianglesByBoundedPlane approximates the polygon footprint by its AABB in the polygon's local frame. The comment claimed that was a safe superset. It is the opposite: the kept set is (non-material side) UNION (material side INTERSECT outside-footprint), and since footprint is contained in its AABB, outside-AABB is contained in outside-footprint — so the approximation removes MORE than the real boolean and the bound comes out tighter than truth. A 2x2x3 box cut by a triangular boundary reported half its true height, as a real tessellation rather than a fallback. Exact when the boundary IS its own AABB, which is every instance in the public corpus and the standard Revit wall/slab/beam cookie-cutter. Anything else now declines to the conservative OBB path rather than under-reporting. The area test rather than a vertex count, so a rectangle carrying a redundant collinear vertex still clips. Also declines halfSpacePlane's AgreementFlag when absent or non-boolean instead of defaulting to true — guessing gives a 50% chance of removing the wrong half, and the mandatory schema attribute is present on all 11 corpus instances, so this costs nothing measurable. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The gate declines a polygonal boundary that is not its own AABB by comparing shoelace area against AABB area, but it did so with a 1e-6 relative tolerance. An area tolerance buys a LINEAR deviation of order sqrt(relEps) * L, because a corner cut of side d costs only d^2/2 of area: on a 20x20 boundary a 2.8 mm chamfer loses a ratio of ~1e-8 and sailed through. The AABB clip would then remove a corner the real footprint leaves intact, tightening the bound below truth — the one failure a quantities consumer cannot defend against, and precisely the failure this gate exists to prevent. 1e-12 admits ~1e-6 * L, micrometres on a metre-scale polygon and an order of magnitude under Gate 1's own 1e-5 m, while still sitting four orders of magnitude above the ~1e-16 relative error a float64 shoelace sum carries. A rectangle with a redundant collinear vertex contributes exactly zero area and still passes, which is what kept the area test in preference to a vertex count. The new test is mutation-proven: at 1e-6 the chamfered boundary clips as "extrude" instead of declining to "obb". Both parity gates pass unchanged and docs/coverage.md is byte-identical, so no corpus boundary sat in the admitted band. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Tightening the area gate to 1e-12 made its numerics load-bearing, and the raw shoelace sum is not accurate enough to carry that. Area is translation invariant; the sum computing it is not. A millimetre file placed on a site grid carries boundary coordinates near 1e6, whose pairwise products land near 1e12 while the area they cancel down to is ~1e2, so the sum arrives with a relative error that swamps the gate by orders of magnitude. Measured on a 20x20 rectangle: at an origin of 1e6 + 0.13 the raw sum reports a 3.1e-7 area deficit that does not exist. The gate declines, the element falls back to a box, and the coverage this path exists to win is silently lost on exactly the files it was written for. The fractional part matters — on exact powers of ten the cancellation happens to come out clean, which is why the first version of the regression test passed against the bug. Subtracting poly[0] from both ends of every term keeps the products O(side^2), and the same rectangle then measures an exact zero deficit. This only ever declines less, never more, so it cannot introduce an under-report. The test is mutation-proven: restored to the raw sum, the far-from- origin rectangle declines to "obb". Both parity gates pass and docs/coverage.md is byte-identical. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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clipMeshByDifferencegated a boolean's second operand onsecond.IsA("IfcHalfSpaceSolid").step.Instance.IsAmatches the exacttype keyword — there is no EXPRESS schema behind this library — so the subtype
IfcPolygonalBoundedHalfSpacenever passed. All 11 instances in the publiccorpus declined, and the bounded-clipping path below the gate, which was fully
written, was dead code. It is Revit's standard mitred wall/slab/beam join, so
the cost was paid on ordinary architectural models.
Measured result
ifcopenhouseduplex_afzk_haus(The "before" column is the state after #59, not
main.)The unhandled-item table is now empty. The freed elements land in the
Extrude column, not Brep — which is the correct signature of a real clip:
clipMeshByDifferenceinherits itsGeomSourcefrom its recursed firstoperand, and these are extrusions. Landing in Brep would have been the
suspicious outcome.
The audit behind the three-line predicate
Every
IsA(<supertype>)call ingeometry/andmodel/was checked againstentity counts from the whole corpus.
IfcHalfSpaceSolidis the only supertypewith live subtypes:
IfcFaceSurface,IfcEdgeLoopandIfcBoxedHalfSpaceallhave zero occurrences. So this is a predicate rather than a subtype
registry, and
docs/design/2026-09-24-tessellation-gaps-and-placement-dos.mdrecords the condition for revisiting that.
unhandled.gogated on the same keyword and moves in the same commit —otherwise the generated, byte-compared coverage page would keep advertising a
gap that no longer exists.
bbox.goalready enumerated all three keywords byhand and now shares the predicate, so the package holds one answer instead of
two that had already drifted apart once.
The AgreementFlag convention held
clipTrianglesByBoundedPlanehad never executed against a dispatched realfile — it had unit tests, but the gate always rejected its input, so its sign
convention was derived from the oracle-validated plain half-space path rather
than validated itself. It passed on the first run, and was independently
re-derived from the buildingSMART spec text ("the agreement flag is TRUE if the
normal to the BaseSurface points away from the material") and from
IfcOpenShell's own kernel behaviour. No inversion.
A real under-reporting bug, found and fixed before merge
Opening the gate exposed something the gate had been hiding. The footprint is
approximated by its AABB in the polygon's local frame, and the comment claimed
that was "a safe superset". It is the opposite. The kept set is
(non-material side) ∪ (material side ∩ outside-footprint); sincefootprint ⊆ AABB,outside(AABB) ⊆ outside(footprint), so the approximationremoves more than the real boolean and the bound comes out tighter than
truth — the one failure a quantities consumer cannot defend against.
A 2×2×3 box cut by a triangular boundary reported half its true height, as a
genuine
extrudetessellation rather than a fallback, so nothing downstreamsignalled the degradation. A square rotated 45° within its own local frame
fails identically.
Gate 1 could not catch this: all 11 corpus boundaries are axis-aligned
rectangles in their own local frame, where the AABB is exact.
So a boundary that is not its own AABB now declines to the conservative OBB
path rather than under-reporting. The test is a shoelace area comparison
rather than a vertex count, because
duplex_a#4266is a rectangle carryinga redundant collinear vertex and must still clip — all 11 corpus instances do,
and the measured gains above are unaffected. The misleading comment is
rewritten, since as written it would have licensed widening this path on a
false safety argument.
A per-edge half-plane clip would handle the general case exactly for a convex
boundary; that is noted as the reason to revisit, but it would ship
general-case geometry with only synthetic coverage, whereas declining keeps the
pre-existing safe behaviour for shapes the corpus cannot vouch for.
Also:
halfSpacePlanedefaultedagreeInside = truewhenAgreementFlagwasabsent. That is a mandatory attribute, and guessing is a 50% chance of removing
the wrong half — one outcome of which under-reports. It now declines.
Closes #52
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Summary by CodeRabbit
New Features
Bug Fixes
duplex_aandfzk_haus, with fewer elements relying on bounding-box approximations.