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util.unit: scale RepresentationContext Precision on unit conversion #6127

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IfcGeometricRepresentationContext.Precision is typed as a plain IfcReal
but is interpreted in the project length unit, so the IfcLengthMeasure
traversal in convert_file_length_units never touched it. A model
converted from mm to m kept a Precision of e.g. 0.01 (fine in mm, huge
in m), which breaks downstream geometry interpretation such as
IfcConvert boolean cleanup.

Subcontexts derive Precision from their parent, so only root contexts
are scaled.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Petru Conduraru
2026-07-05 20:17:32 +03:00
committed by Thomas Krijnen
parent 58cfab48e6
commit bade0647e8
2 changed files with 25 additions and 0 deletions
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src/ifcopenshell-python/ifcopenshell/util/unit.py
+7
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@@ -912,6 +912,13 @@ def convert_file_length_units(ifc_file: ifcopenshell.file, target_units: str = "
new_value = convert_value(val)
setattr(element, attr.name(), new_value)
# IfcGeometricRepresentationContext.Precision is typed as a plain IfcReal
# but is interpreted in the project length unit, so it must be scaled too.
# Subcontexts derive Precision from their parent and cannot be set.
for context in file_patched.by_type("IfcGeometricRepresentationContext", include_subtypes=False):
if context.Precision is not None:
context.Precision = convert_unit(context.Precision, old_length, new_length)
has_map_unit = False
if (
ifc_file.schema == "IFC2X3"