Move Blender-independent boundary generation algorithm from Bonsai
(GPL) to ifcopenshell.util.boundary (LGPL):
- ifcopenshell.util.shape.dissolve_faces: reconstruct polygonal faces
from triangulated mesh using original edges from get_edges() + Union-Find
- ifcopenshell.util.boundary.auto_generate_boundaries: full boundary
generation algorithm using IFC geometry (numpy, shapely) without
Blender — replaces bmesh, matrix_world, tool.Cad.is_x, mathutils with
numpy equivalents
- Uses existing ifcopenshell.api.boundary.assign_connection_geometry
for connection geometry creation
- Uses existing ifcopenshell.util.placement.a2p + np_normal for face
matrix construction
- BOUNDARY_ELEMENT_CLASSES expanded to include IfcColumn and
IfcCurtainWall
Bonsai's boundary/operator.py auto_generate_boundaries is now a thin
adapter handling Blender-specific preprocessing (flushing moved
objects, building iterator + tree) then delegating to the util module.
Added 12 tests: 3 for dissolve_faces, 3 for auto_generate_boundaries.
Generated with the assistance of an AI coding tool.
Move Blender-independent space generation algorithms from Bonsai
(GPL) to ifcopenshell.util (LGPL):
- ifcopenshell.util.shape.bisect_mesh_plane_vf: vectorized numpy
triangle/plane intersection for mesh bisection
- ifcopenshell.util.element.iter_top_connections: walker for
IfcRelConnectsElements(TOP) relationships
- ifcopenshell.util.space: new module with get_boundary_lines,
get_space_polygon, get_auto_space_height and height detection
helpers — all operating on IFC geometry without Blender
Bonsai's tool/spatial.py now delegates to these utilities via
thin wrappers, keeping only Blender-specific concerns (cache
management with depsgraph invalidation, UI property reads).
tool/wall.py iter_wall_slab_connections delegates to
ifcopenshell.util.element.iter_top_connections.
Added 22 tests: 6 for bisect_mesh_plane_vf, 10 for space
generation algorithms, 4 for iter_top_connections, 2 Bonsai
integration tests for cache behavior.
Generated with the assistance of an AI coding tool.
There are a few differences to the previous implementation:
1. It is no longer recalculated on wall regeneration. The new wall
regeneration is strict to the spec on the rules of rel connects path,
and so this being a "userdefined" connection we only calculate it
explicitly when the user invokes the operator.
2. It uses meshes instead of clipping planes, so you can clip to
strange shapes or gable roofs or whatever. Nice.
On older numpy versions, np.ndarray was less forgiving and wasn't allowing passing 1 argument instead of required 2.
And turned out numpy doesn't yet have typing for shapes (https://github.com/numpy/numpy/issues/16544), so all matrices and other shapes specified as `npt.NDArray[np.float64]`.
Fixed type discrepancies for `get_edges` and `get_faces` and also had to fix `import_ifc` as Blender apparently has problems with storing np.int32 in custom attributes (https://projects.blender.org/blender/blender/issues/121072), tested that Blender is okay with np.int32 in other cases we had (addressing BMesh.verts[i] where `i` is np.int32).
CyrilWaechter