BCFTopics Import fails

[CarlosAMCG]

Describe the bug 📝

I attempted to integrate the BCF Component into my project. While the export functionality works flawlessly, importing the same BCF file triggers an error. To verify the issue, I revisited the official tutorial (https://thatopen.github.io/engine_components/examples/BCFTopics/), and the error is reproducible there as well. It seems the problem might be related to the import logic or file handling in the component.

Reproduction ▶️

https://thatopen.github.io/engine_components/examples/BCFTopics/

Steps to reproduce 🔢

Export the BCF file from the example
Import it again
An error is raised

System Info 💻

N/A

Used Package Manager 📦

npm

Error Trace/Logs 📃

index-Bv9-N0Ab.js:68 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'split')
at g (index-Bv9-N0Ab.js:68:4355)
at ve.load (index-Bv9-N0Ab.js:68:5688)
at async HTMLInputElement. (bCFTopics.js:1:2953)

Validations ✅

• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a repository issue and not a framework-specific issue. For example, if it's a THREE.js related bug, it should likely be reported to mrdoob/threejs instead.
• Check that this is a concrete bug. For Q&A join our Community.
• The provided reproduction is a minimal reproducible example of the bug.

[CarlosAMCG]

I figured it out — the issue occurs when the BCF file is created without any viewpoints (as in the example provided). In that case, the import fails. I implemented BCF topic creation with viewpoints in my project, and the export/import cycle works correctly.

For reference, I’m attaching a minimal working BCF example that the BCFTopics loader is able to import successfully (changed the extension to "zip" to bypass github file extension checks).

Cubos_Posicion.zip

Question:
Is this the expected behavior? Should the component always require at least one viewpoint for the import to succeed?