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Ryan Schultz
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SetDimensionAnchor — hover-select-then-confirm: - Cursor highlights candidate IFC elements (orange Blender selection outline) before committing; Tab cycles through overlapping/coplanar candidates - _compute_candidates: ray-cast all IFC mesh objects; falls back to 2D bounding-box proximity (5 cm tolerance) for plan-view picks where the ray misses the mesh by sub-mm amounts - _write_anchor: after anchoring a face, immediately calls regenerate_dimension with placement_override (Blender matrix_world) and _update_blender_curve so the curve vertex moves to the resolved point DrawParametricDimension — ForcePerpendicularToFace live snap constraint: - Reads force_perpendicular_to_face toggle from annotation props on invoke - After anchor[0] is placed on a FACE, _update_perp_constraint extracts the face normal and stores it as the constraint axis - _apply_perp_constraint runs every modal tick after handle_snap_selection, projecting the current snap point onto pt[0] + t*normal - On finalize, _create_dimension_from_polyline writes ForcePerpendicularToFace to the BBIM_Dimension pset and calls regenerate_dimension to snap the stored curve to the constraint before the operator exits regenerate_dimension.py: - ForcePerpendicularToFace block: after resolving all anchors, projects vertices 1…n onto the line through pt[0] along anchor[0]'s face normal - _get_anchor_face_normal_world: reads normal_local from anchor fingerprint, calls _rotate_local_to_world with placement_override; falls back to stored world-space normal resolve_anchor.py: - _rotate_local_to_world: transforms an element-local direction vector to world space using the element's placement or placement_override matrix pset/operator.py: - EditPset._execute: after editing a BBIM_Dimension pset on an IfcAnnotation, auto-calls regenerate_dimension + _update_blender_curve so changes to anchors/ForcePerpendicularToFace are reflected immediately in the viewport prop.py / workspace.py: - Added force_perpendicular_to_face BoolProperty to BIMAnnotationProperties - UI toggle shown in annotation tool header for DIMENSION/RADIUS/DIAMETER/ ANGLE/PLAN_LEVEL/SECTION_LEVEL types Psets_BBIM_Annotation.ifc: - Added ForcePerpendicularToFace property template (#39) to BBIM_Dimension - Extended BBIM_Dimension applicability to ANGLE, PLAN_LEVEL, SECTION_LEVEL Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
IfcOpenShell
IfcOpenShell is an open source (LGPL) software library for working with Industry Foundation Classes (IFC). Complete parsing support is provided for IFC2x3 TC1, IFC4 Add2 TC1, IFC4x1, IFC4x2, and IFC4x3 Add2. Extensive geometric support is implemented for the IFC releases IFC2x3 TC1 and IFC4 Add2 TC1. Extending with support for arbitrary IFC schemas is possible at compile-time when using C++ and at run-time when using Python.
In addition to a C++ and Python API, IfcOpenShell comes with an ecosystem of tools, notably including IfcConvert (an application to convert IFC models to other formats), Bonsai (an add-on to Blender providing a graphical IFC authoring platform), and many other libraries, CLI apps, and more. Support is also provided for auxiliary standards such as BCF and IDS.
For more information, see:
Development is sponsored through your generous donations!
Contents
| Name | Description | License | Service |
|---|---|---|---|
| bcf | Library to read and write BCF-XML and query OpenCDE BCF-API modules | LGPL-3.0-or-later |   |
| bonsai | Add-on to Blender providing a graphical native IFC authoring platform | GPL-3.0-or-later |    |
| bsdd | Library to query the bSDD API | LGPL-3.0-or-later |  |
| ifc2ca | Utility to convert IFC structural analysis models to Code_Aster | LGPL-3.0-or-later | |
| ifc4d | Convert to and from IFC and project management software | LGPL-3.0-or-later |  |
| ifc5d | Report and optimise cost information from IFC | LGPL-3.0-or-later |  |
| ifcbimtester | Wrapper for Gherkin based unit testing for IFC models | LGPL-3.0-or-later | |
| ifcblender | Historic Blender IFC import add-on | LGPL-3.0-or-later* | |
| ifccityjson | Convert CityJSON to IFC | LGPL-3.0-or-later |  |
| ifcclash | Clash detection library and CLI app | LGPL-3.0-or-later |  |
| ifcconvert | CLI app to convert IFC to many other formats | LGPL-3.0-or-later* |   |
| ifccsv | Library and CLI app to export and import schedules from IFC | LGPL-3.0-or-later |  |
| ifcdiff | Compare changes between IFC models | LGPL-3.0-or-later |  |
| ifcedit | CLI wrapper for ifcopenshell.api IFC model mutation functions | LGPL-3.0-or-later |  |
| ifcfm | Extract IFC data for FM handover requirements | LGPL-3.0-or-later |  |
| ifcmax | Historic extension for IFC support in 3DS Max | LGPL-3.0-or-later* | |
| ifcmcp | MCP server for querying and editing IFC building models | LGPL-3.0-or-later |  |
| ifcopenshell-python | Python library for IFC manipulation | LGPL-3.0-or-later* |         |
| ifcpatch | Utility to run pre-packaged scripts to manipulate IFCs | LGPL-3.0-or-later |  |
| ifcquery | CLI tool for querying and inspecting IFC building models | LGPL-3.0-or-later |  |
| ifcsverchok | Blender Add-on for visual node programming with IFC | GPL-3.0-or-later |  |
| ifctester | Library, CLI and webapp for IDS model auditing | LGPL-3.0-or-later |  |
The IfcOpenShell C++ codebase is split into multiple interal libraries:
| Name | Description | License |
|---|---|---|
| ifcgeom | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcgeom_schema_agnostic | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcgeomserver | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcjni | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcparse | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcwrap | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| qtviewer | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| serializers | Internal library for IfcOpenShell | LGPL-3.0-or-later* |