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Add Force Parallel to Face constraint for parametric dimensions

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Adds a new 'Force ∥ to Face' toggle alongside the existing 'Force ⊥ to
Face'. The constraint direction is cross(face_normal, camera_dir), keeping
dimension vertices running along the face surface rather than into it.
Enabling one constraint automatically disables the other (mutual exclusion
via a re-entrant guard in the prop callbacks).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Ryan Schultz
2026-08-15 11:55:32 -05:00
parent 6cae194610
commit 99f95bee6a
4 changed files with 239 additions and 51 deletions
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src/ifcopenshell-python/ifcopenshell/api/drawing/regenerate_dimension.py
+28
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@@ -119,6 +119,34 @@ def regenerate_dimension(
base[2] + t * normal[2])
anchors[i]["pt"] = list(resolved[i])
# ForceParallelToFace: project vertices 1…n onto the line through
# pt[0] in the direction cross(face_normal, camera_dir), so the polyline
# runs parallel to the face (perpendicular to the face normal).
if pset_data.get("ForceParallelToFace") and len(resolved) >= 2 and resolved[0] is not None:
face_normal = _get_anchor_face_normal_world(file, anchors[0], placement_override)
if face_normal and camera_dir:
fn, cd = face_normal, camera_dir
tang = (
fn[1] * cd[2] - fn[2] * cd[1],
fn[2] * cd[0] - fn[0] * cd[2],
fn[0] * cd[1] - fn[1] * cd[0],
)
mag = math.sqrt(tang[0] ** 2 + tang[1] ** 2 + tang[2] ** 2)
if mag > 1e-12:
tang = (tang[0] / mag, tang[1] / mag, tang[2] / mag)
base = resolved[0]
for i in range(1, len(resolved)):
if resolved[i] is None:
continue
pt = resolved[i]
t = ((pt[0] - base[0]) * tang[0]
+ (pt[1] - base[1]) * tang[1]
+ (pt[2] - base[2]) * tang[2])
resolved[i] = (base[0] + t * tang[0],
base[1] + t * tang[1],
base[2] + t * tang[2])
anchors[i]["pt"] = list(resolved[i])
pset_entity_id = pset_data.get("id")
if pset_entity_id:
pset_entity = file.by_id(pset_entity_id)