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IfcOpenShell/src
Gorgious56 0c8b6e93c6 Add GizmoRoofEdition + fix low-slope normals + cancel restore
Ports roof parametric edit gizmo group from gizmos-8088 and folds in
three roof-mesh bug fixes surfaced during live testing.

Port:

* ``CycleRoofGenerationMethod`` operator (bim.cycle_roof_generation_method)
  cycles props.generation_method between "HEIGHT" and "ANGLE". Shift+click
  cycles in reverse via the ``CycleTypeMixin`` contract.
* ``GizmoRoofEdition`` gizmo group: 3 dimension gizmos for height
  (visible in HEIGHT mode) / slope angle with tan/atan2 rise round-trip
  + degree formatter (ANGLE mode) / roof_thickness. All three handles
  anchor at the object's local origin and separate visually via their
  declared axes (height/slope +Z, thickness -Z) — height + slope are
  mutually exclusive via ``visibility_condition`` so they never paint
  at the same time. Anchoring at the origin sidesteps the first-click
  default-identity-matrix symptom that footprint-derived anchoring
  would have hit on a stale ``RoofData`` cache.
* Lifecycle factory swap: explicit ``EnableEditingRoof / CancelEditingRoof
  / FinishEditingRoof`` classes replaced by ``tool.Parametric.build_edit_lifecycle("roof", _RoofEditMixin, ...)``.
  Same bl_idnames out, no external caller changes.
* Registration: ``CycleRoofGenerationMethod`` + ``GizmoRoofEdition``
  added to ``bim/module/model/__init__.py`` classes tuple.
* Tests: ``test_roof_gizmos.py`` covering slope round-trip, visibility
  gates, cycle operator metadata, and origin-anchored positioning.

Bug fixes:

* ``generate_hipped_roof_bmesh`` flipped the bottom slab face's normal
  at low slope angles. The kernel's outward-inference becomes
  ambiguous on near-flat geometry once ``remove_doubles`` and
  internal-face deletion run, and the early ``recalc_face_normals``
  pass at line 389 ran BEFORE the topology was final. A second pass
  on the final closed mesh fixes the eave plane (now reliably points
  down regardless of slope).
* ``bpypolyskel.polygonize`` can emit a face whose vertex list
  contains the same index twice on certain footprint/slope
  combinations (a straight-skeleton ridge collapse). ``bm.faces.new``
  rejects those with ``found the same (BMVert) used multiple times``,
  aborting the whole rebuild. Filter the degenerate faces out so the
  rest of the roof renders.
* ``_RoofEditMixin._restore_viewport_after_cancel`` now rebuilds the
  bmesh from the just-restored draft via ``update_roof_modifier_bmesh``.
  The hook was abstract on ``PathPreservingEditMixin`` and raised
  ``NotImplementedError`` on cancel-after-edit, leaving the user
  stranded.

Also folds in a parallel ``tool/loader.py`` swap from
``tool.Blender.Modifier.is_railing`` to ``tool.Parametric.is_railing``
(consistent with the rest of the loader using ``tool.Parametric.*``).

Verified: headless smoke green, test_parametric_registry.py 8/8,
test_roof_gizmos.py 15/15. ruff + black clean on the touched files.

Generated with the assistance of an AI coding tool.
2026-06-11 18:34:42 +02:00
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