PR: Joins between elements not exported correctly in Revit 2026
Open
problem
- Dominant language
- C#
- Stars
- 637
- Forks
- 225
- PR merge metrics
- No merged PRs in 30d
Description
### Problem Description
It seems that for both IFC for Revit version 26.1.0 and 26.4.1 joins between elements are not longer exported correctly. This worked fine in Revit 2025 with IFC exporter 25.4.40.
Geometry in Revit:
Geometry in IFC for Revit 2026:
Geometry in IFC from Revit 2025:
### Revit Version
2026.4.x
### IFC for Revit Addon Version
26.4.1
### Windows Version
11 25H2
Contributor guide
Research direction
Reproduce the export with Revit 2026.4.x and IFC for Revit 26.4.1, then compare the resulting joins with the Revit 2025 export shown in the report. No source files or tests are named; done means joined elements export with the expected geometry in Revit 2026.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp
- Domain
- computer-graphics
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Needs clarification
- Newbie friendliness
- 38/100