Importing a GLB exported from SketchUp, all materials have an IOR of 1000

[videopilot]

I exported a model from SketchUp 2024 as DAE and GLB. The GLB had all materials set to an IOR of 1000. Comparison below:

Not sure if SketchUp is putting that value in the file or if it's the importer, but I also converted the GLB to GLTF at 3dpea.com, and there doesn't seem to be any IOR stored in the converted file. Importing that GLTF had a more reasonable IOR of 1.5.

floor 3.zip

[scurest]

The .glb file uses the extension KHR_materials_pbrSpecularGlossiness, which is always imported with an IOR of 1000, see #2127. This makes some of the math come out correctly IIRC.