Andy Ward

Yes these are all types introduced in IFC4 and as touched upon in #600, EntityCreator only supports IFC 2x3 entities as a baseline. What I think may work is to...

FYI IFC4 changelog here: https://standards.buildingsmart.org/IFC/DEV/IFC4_2/FINAL/HTML/link/ifc2x3-to-ifc4-changelog.htm

Some example of how this could be implemented using ExtensionMethods on `IModel` so you can try out yourself. 1. Compile time approach: https://gist.github.com/andyward/6d6281b0794571ef2429096ed50a4317 ```csharp IModel model = new IO.Memory.MemoryModel(new EntityFactoryIfc4());...

Have addressed the immediate issue but there may be other scenarios. E.g. 'derived' measures or other Selects that reference sub-classes.

A broader issue is we cannot use Measures in a schema agnostic fashion since we don't provide a cross-schema interface for them. E.g. while this is now addressed for _IfcLengthMeasures_,...

Looks to me that these 2 tests should be deleted since the more comprehensive Floating point tests are now in the tolerance folder.

I think it would be easier if you share the test harness you've built (and affected model)? It's tricky to see the hotspot from the screenshots. Not sure how much...

It feels like adding parallelism is probably dodging the issue here. And as you see you're only getting 25% improvement. Fundamentally I'd suggest it's an algorithm problem. I did a...

No problem. If it helps we can do an NDA -just email me (See my profile) But you can take a look yourself: Do you want to pull this [branch](https://github.com/xBimTeam/XbimEssentials/commit/c777ef67d037a9c30aa4620f4a67db56322478e6)...

> However, I noticed in the viewer that the model only has a single geometry, instead of individual objects that could be selected. I'm assuming it's a really complex triangulated...