I'm working on converting IFC to CITYJSON.

[Pdongjaelee]

hello.
I'm working on converting IFC to CITYJSON.

Currently, IFCOPENSHELL is used to extract geometry information from IFC data.

Now I just need to create this data as a CITYJSON file, but I keep getting an error.

I mainly used cjio to create cityjson, but is there another way?

[hugoledoux]

this is a discussion, not an issue wiht the specs

[Pdongjaelee]

hello.
I am using cjio to convert ifc to cityjson.

Could you please take a look at my code?

[hugoledoux]

cjio cannot convert IFC to CityJSON I'm afraid, it only reads CityJSON and OBJ as input.

[Pdongjaelee]

Ah, I have a lot of obj files.

If I have an obj file, can I convert it to cityjson using cjio?

[Pdongjaelee]

Oh, then there is currently no way to convert ifc, obj to cityjson using cjio?

[hugoledoux]

No. cjio is designed to manipulate CityJSON files and export to a few easy formats like glTF or CityJSONSeq.

There are papers to convert IFC to CityJSON, some have code, but it's not a simple operation.

[Pdongjaelee]

Ah, I am currently using the ifc library to extract the parts needed for cityjson.
Just extract it into cityjson.
I was using cjio for that.

Has there ever been a situation like this?

[jaspervdv]

We are working on an application that abstracts IFC models and stores it as a CityJSON model. It does not extract the ifc data and store it in the CityJSON format 1:1 but it might still be interesting for you to take a look at.

https://github.com/jaspervdv/IFC_BuildingEnvExtractor

[Pdongjaelee]

hello.
I successfully converted cityjson to lod3.2 yesterday.

But there is a problem.
he external and internal forms of this converted cityjson have been converted intact.
However, there is no representation of converted objects in ifc.
Objects like ifcbeam.

[Pdongjaelee]

https://github.com/jaspervdv/IFC_BuildingEnvExtractor
Oh, so using this link, is it possible to abstract the IFC model and save it as a CityJSON model?

That's what it looks like when I take a quick look at the link.