Merge multiple versions of an IFC file?

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Open theoryshaw opened 7 years ago

theoryshaw commented 7 years ago

Does anyone know of a solution that...

removes duplicate GUIDs
monitor objects that have been deleted (that is, not reintroduce them again on future merges downstream)

Essentially looking for a solution that merges multiple versions of an IFC file over time.

aahoo commented 7 years ago

Using IfcOpenShell, the first question can be solved with a few lines of code. The second one requires a lot of work.

aothms commented 7 years ago

In addition, there might be some overlap with what the BIMserver's ModelComparePlugin tries to accomplish.

I-Sokolov commented 7 years ago

Some important details may depend on your specific application/task so I doubt there is ready solution.

If 2 objects have equal GUID which of them will remain? IFC file has no order.
To identify removed object on next run you need some key to identify them. GUID is not suitable, there must be another key. Maybe it helps to think not 'remove' but 'merge' duplicated objects? Do you mean objects as IfcObject entities? Relations or type objects it may be a different story.

theoryshaw commented 7 years ago

Hi Igor,

Do you mean objects as IfcObject entities? Relations or type objects it may be a different story.

Would be just IfcObjects at this point. Worry about relations and type objects later.