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IFC Import Issues

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We have been sent an IFC.

 

The IFC when viewed in Solibri is correctly located in X, Y and Z.

 

The 'default' building is correctly located.

 

The 'Bottom Elevation' of objects in the IFC are correct.

 

However, when importing into Vectorworks the Design Layer elevation is incorrect.

 

On further investigation, the 'IFCSITE' level is correct, but the 'IFCBUILDINGSTOREY' level is incorrect.  It looks like Vectorworks imports layers related to 'IFCBUILDINGSTOREY', which is logical but clearly the IFC is not giving the right information.

 

It would appear that the author of the model (who uses another well-known BIM authoring tool) has set their model up so that the model levels are related to 0m, and not true levels AOD.

 

And have set the level of the model on export by using a value entered at the 'Project Base Point'.

 

It would appear that the export of IFC from their software does not summate the value of the IFCBUILDINGSTOREY and IFCSITE levels to correctly export the model at the correct height, or conversely, Vectorworks is not adding the two values to define the correct layer elevation.

 

Who is right?

 

This is the only project I have worked on where this is a problem.  In all other models, we usually have no issue when the models are located at their correct level AOD.  The override specified at the Project Base Point is causing the issue.  Seems to me the issue is their end, not ours.

 

Thought I would bring this up just in case anyone else is having coordination issued caused by others not setting up their models correctly and artificially exporting IFC by cheating the software into thinking the model is somewhere it isn't.

 

 

 

 

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