Loss of Style for Building Elements (Walls, Slabs, ...) and Transparency for Windows

[lvanlier]

Thanks of lot for the work done in the IFCJSON project.

I am building a platform that converts IFC to IfcJSON with IFC2JSON and stores the IfcJSON in a PostgreSQL database. Thereafter, when needed, the IfcJSON is converted back to an IFC with JSON2IFC for visualization in a standard IFC Viewer. All this works fine, except for rendition.

In most IFC Viewers, building elements (Walls, Slabs, ...) are grey and transparency of Windows is lost so that it is not possible to see through. This is also the case for the IFC files provided in the Samples (e.g. Duplex_A_20110907_optimized_roundtrip.ifc).

My project is d4su-server and the doc in https://lvanlier.github.io/. This issue is highlighted in Transform the ifcJSON to IFC

Any fix or hint for a fix will be appreciated.