LayerAssignments inverse attribute for IfcRepresentation and IfcRepresentationItem are not followed

[Krzysztof-FF]

It seems that after deserializing IFC file, LayerAssignments inverse attribute for IfcRepresentation and IfcRepresentationItem are "not followed", i.e. they have not been resolved and function getLayerAssignments() returns an empty list.
I do not know how to configure IfcStepDeserializer so as to fill inverse references to layer(s) that reference given IfcRepresentation / IfcRepresentationItem.
Implementations of ObjectIDM seem to be used only in serialization / comparing / copying processes, but there are no occurrences of using this concept (of limiting / allowing classes by shouldIncludeClass and references by shouldFollowReference) in reading, i.e. deserialization process.
So I suppose it may be some deficiency of EMF deserializing process.

[rubendel]

Are you storing the model in de BIMserver database in between? Or are you just deserializing to EMF and then calling getLayerAssignments?

[Krzysztof-FF]

Just deserializing to EMF and then calling getLayerAssignments.

On Tuesday, November 12, 2013, Ruben de Laat wrote:

Are you storing the model in de BIMserver database in between? Or are you
just deserializing to EMF and then calling getLayerAssignments?

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[rubendel]

Sorry for the late reply. This seems to be yet another case of the issue described here: https://github.com/opensourceBIM/BIMserver/wiki/Known-Issues#inverses

The problem in short is that the IFC model (actually STEP models in general) are not fully mappable onto EMF.

I think this is an important problem that's worth looking into, maybe there is some kind of fix for it, but it will have quite some impact on BIMserver.

So for now there's not really a solution, other that iterating over all IfcPresentationLayerAssignment objects in the model and looking for the AssignedItems references that are referring the IfcRepresentation/Item you are interested in.

[Krzysztof-FF]

That's exactly what I was afraid of, and how I've managed to do it
"manually". Thank you for replying anyway.

On Thursday, November 21, 2013, Ruben de Laat wrote:

Sorry for the late reply. This seems to be yet another case of the issue
described here:
https://github.com/opensourceBIM/BIMserver/wiki/Known-Issues#inverses

The problem in short is that the IFC model (actually STEP models in
general) are not fully mappable onto EMF.

I think this is an important problem that's worth looking into, maybe
there is some kind of fix for it, but it will have quite some impact on
BIMserver.

So for now there's not really a solution, other that iterating over all
IfcPresentationLayerAssignment objects in the model and looking for the
AssignedItems references that are referring the IfcRepresentation/Item you
are interested in.

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.