Autodesk / Autodesk/revit-ifc

PR: Multiple IFC types for single Revit type element

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problem
Dominant language
C#
Stars
637
Forks
225
PR merge metrics
No merged PRs in 30d

Description

### Problem Description

I have a single alarm type, which has 10 instances in a model. It is exported as 3 different types, with the same name and information.
When I check the ifc file within Solibri or Notepad, the only different information is GUIDs for those types. The instances in the project are seperated as 1-4-5. Normally, they should all belong to the single Ifc type.

This behaviour is not version specific. I attached the model (default revit template with the 10 instances of the same type). Also, using standard 2x3 CV export or IFC4RV export, or using or not using userdefinedpropertyset file doesnt change the behaviour.
[test_for_ifc.zip](https://github.com/user-attachments/files/17042457/test_for_ifc.zip)
![ifc type 1](https://github.com/user-attachments/assets/4cdef683-fa3f-498a-8951-63fad2174937)
![ifc type 2](https://github.com/user-attachments/assets/fc819b15-9fac-41ab-860c-3ec1e6e6e1e5)

### Revit Version

2022.0.x

### IFC for Revit Addon Version

24.x.x

### Windows Version

10 22H2

Contributor guide

Open the contributing guide

Research direction

Reproduce the report using the attached test_for_ifc.zip with Revit 2022 and inspect the resulting IFC in Solibri or a text editor. Compare standard IFC 2x3 CV and IFC4RV exports, with and without the user-defined property set, and consider the issue complete when the 10 instances of one Revit type are assigned to one IFC type.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
desktop-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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