Restrict Fraction to Volume in IfcMaterialConstituent #849
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Refine the definition of the Fraction attribute in the IfcMaterialConstituent entity. Previously, Fraction could represent volume or weight, leading to data inconsistencies.
jbrouwerdigibase
changed the title
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I agree with your point that it is currently unprecise. I also agree that, in most cases, volume is more important. However, I'm not so sure everyone would agree with us, considering that weight is more important in geotechnics and road construction, as volume can be affected by the moisture content and compaction of aggregates, and it is where you would often use material constituents. I think it has to wait for the next major release of IFC. |
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Good points, good to have the discussion with Infra people. |
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Description
This pull request refines the definition of the Fraction attribute in the IfcMaterialConstituent entity. Previously, Fraction could represent volume or weight, leading to potential inconsistencies.
Change
Volume-Specific Fraction: The Fraction attribute now exclusively refers to the volume proportion of a material constituent within the overall material set. This aligns with the inherent nature of material constituents in construction, where volume is the primary concern.
Rationale
There's limited practical use for specifying weight ratios between components like concrete, insulation, or reinforcement steel. Weight becomes relevant after the volume is established. By focusing on volume, we ensure consistent and meaningful data exchange within BIM workflows.
Benefits
Enhances data clarity and consistency across BIM models.
Eliminates ambiguity during IFC data interpretation.