@Matti-Kannala
Thank you very much for providing some definitions.
I am still getting inconsistencies in the Elevation outputs in Solibri in the Location tab.
Are you able to help with the following?
I am simply reviewing a file with IfcSlab elements at 12ft. storey heights in order to understand the Solibri Elevation properties. There is a basement level slab and ground, first and second floor level slabs, then a roof slab. The lowest slab is defined as an IfcSlab_BASESLAB and the highest level slab is an IfcSlab_ROOF element. All the intermediate floors are IfcSlab_FLOOR elements. The slabs are all 12" thick. The origin is set to the underside of the ground floor slab although I have also experimented with it at the top of the ground floor slab but this seems to generate greater inconsistencies.
On upper floors, Solibri seems to take the IfcBuildingStorey Elevation as being to the
underside of the IfcSlab; for a basement floor (IfcSlab_BASESLAB) and ground floor (IfcSlab_FLOOR), Solibri is reading the IfcBuilding Storey Elevation as the
top of slab. Is this correct? Should there be this difference?
The top level IfcBuildingStorey seems to run from the
underside of the IfcSlab_FLOOR to the
top side of the IfcSlab_ROOF. Is that correct?
Is there a preferred elevation for the model origin to be set so that Solibri returns accurate IfcBuildingStorey elevation data?
Lastly, is there any Solibri documentation that explains how all these elevation properties fit together?