Defined in File Ifc4.h
IfcQuantityLength: public Ifc4::IfcPhysicalSimpleQuantity¶
IfcQuantityLength is a physical quantity that defines a derived length measure to provide an element’s physical property. It is normally derived from the physical properties of the element under the specific measure rules given by a method of measurement.
EXAMPLE A rafter within a roof construction may be measured according to its length (taking a common cross section into account). The actual size of the length depends on the method of measurement used.
HISTORY New entity in IFC Release 2.x. It replaces the calcXxx attributes used in previous IFC Releases.
Length measure value of this quantity.
Whether the optional attribute Formula is defined for this IfcQuantityLength.
A formula by which the quantity has been calculated. It can be assigned in addition to the actual value of the quantity. Formulas could be mathematic calculations (like width x height), database links, or a combination. The formula is for informational purposes only.
IFC2x4 CHANGE Attribute added to the end of the attribute list.