[Bug]: Potential Duplication Issue with StreamAllMeshesWithTypes vs. StreamAllMeshes

[onderilkesever]

What happened?

Hi,
I am trying to generate meshes from an IFC file, and I have been following the example provided in your viewer. When I use StreamAllMeshes, the mesh generation works perfectly, and the model is correct.

However, when I try to create meshes using the following snippet with StreamAllMeshesWithTypes, I get a correct model, but I also notice duplicate elements in the output.

Here’s the snippet I used, rest of the code is the same:

		const types = this.webIfc.GetAllTypesOfModel(modelID);

		const excludedTypeIDs = new Set<number>([IFCSPACE, IFCOPENINGELEMENT]);

		const typeIDs = types
			.filter((ifc) => !excludedTypeIDs.has(ifc.typeID)) // Exclude unwanted IDs
			.map((ifc) => ifc.typeID); // Extract typeID

		this.webIfc.StreamAllMeshesWithTypes(modelID, typeIDs, (mesh: FlatMesh) =>
		{

Is this behavior caused by a bug in the library, or could there be an issue with my implementation?

Here is my ifc file if you would like to try out yourself. https://drive.google.com/file/d/1kXqb-5_7z05Trn655KQG7WmQBNoAH94E/view?usp=sharing

Thank you for your help!

Version

0.0.66

What browsers are you seeing the problem on?

Chrome

Relevant log output

No response

Anything else?

No response

[beachtom]

So our code for streaming meshes - excludes IFCOPENINGELEMENT IFCSPACE and IFCOPENINGSTANDARDCASE - then streams all of them if you implement the same logic does the duplicate go away?

[onderilkesever]

Unfortunately, no, the issue still persists. I've included my code snippet above for reference. (I also added IFCOPENINGSTANDARDCASE, but it didn’t make a difference.)

[beachtom]

Thanks. To help me track it down - can you check if you are getting any duplicate typeIds appearing in your typeIDs arrays?

[onderilkesever]

Unfortunately no @beachtom, that was the first thing I also checked. See my updated snippet to ensure no duplicates in the list.

		const excludedTypeIDs = new Set<number>([IFCSPACE, IFCOPENINGELEMENT, IFCOPENINGSTANDARDCASE]);
		
		const types = this.webIfc.GetIfcEntityList(modelID);

		const uniqueTypes = Array.from(new Set(types));

		const filteredUniqueTypes = uniqueTypes.filter(type => !excludedTypeIDs.has(type));

		this.webIfc.StreamAllMeshesWithTypes(modelID, filteredUniqueTypes, (mesh: FlatMesh) =>