Use a fixed revision of OpenCOLLADA...

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>