ENH: Export multiple levels as one IfcBuildingStorey

[andydandy74]

Enhancement Description

Current export behaviour

Any elements assigned to a level that is not declared as a building storey are assigned to the closest level below that has that attribute. That behaviour can be overridden on a per element basis using the IfcSpatialContainer parameter and the target level name as a value.

Proposed change

If the IfcSpatialContainer parameter is assigned to a level (instead of a single element), assign all of the elements on that level to the target level specified in the parameter value. This would make managing export levels a lot easier.

Use case

In Germany, we typically use multiple levels per storey in Revit (top of finished floor, top of floor slab, maybe even more depending on client request, e.g. bottom of floor slab). However when exporting to IFC, we need the elements of those different levels to end up on the same building storey. Generally, the finished floor is the desired level to represent the building storey, but this results in the elements on the floor slab level being exported to the storey below by default. As stated above, we are aware that we can control this export behaviour on a per element level and, yes, we can automate this with a script but why should it have to be so hard?

Revit Version

2024.0.x

IFC for Revit Addon Version

24.x.x

Windows Version

10 22H2