Module units 

Unit extraction and conversion for IFC files

Handles parsing of IFCSIUNIT and IFCCONVERSIONBASEDUNIT (imperial units) and applying appropriate multipliers to geometry coordinates.

Functions

extract_length_unit_scale

Extract length unit scale factor from IFC file

extract_plane_angle_to_radians

Extract the multiplier that converts file plane-angle units to radians.

get_conversion_based_unit_factor

The unit-label tables live in [crate::unit_labels], shared with the georeferencing MapUnit reader; re-exported here so the units:: paths callers already use keep working. Known conversion factors for imperial/conversion-based units to meters These are the standard conversions defined in IFC specification

get_si_prefix_multiplier

The unit-label tables live in [crate::unit_labels], shared with the georeferencing MapUnit reader; re-exported here so the units:: paths callers already use keep working. SI Prefix multipliers as defined in IFC specification. Maps IfcSIPrefix enum values to their numeric multipliers; an absent or unrecognised prefix means the base unit (metres), i.e. 1.0. Callers that must distinguish those two cases want try_si_prefix_multiplier.

try_extract_length_unit_scale

Resolve the length-unit scale ONLY when the full unit chain (IFCPROJECT → IFCUNITASSIGNMENT → IFCSIUNIT) is decodable from the decoder’s current index.

try_extract_plane_angle_to_radians

Partial-index-safe sibling of extract_plane_angle_to_radians.

try_si_prefix_multiplier

The unit-label tables live in [crate::unit_labels], shared with the georeferencing MapUnit reader; re-exported here so the units:: paths callers already use keep working. SI Prefix multiplier for a member of the IfcSIPrefix EXPRESS enumeration, or None when the string is not one of its sixteen members.