The AI assistant is almost right here. Glass materials are explained in the UnityGLTF docs, but for completeness I’m gonna post it here as well.
- Create a new material
- Switch the shader to UnityGLTF/PBRGraph
- Enable transmission (which is what makes glass look like glass in contrast to opacity)
- Set transmission to 1, roughness to 0, metalness to 0
- If you want to be able to preview the glass material in Unity, add this renderer feature (in URP):
or this script in BiRP:
Optionally you can also turn on volume, thickness, and/or dispersion to make more realistic glass. These additional features are not supported in QuickLook at the moment, but regular full-glass materials are supported there as well.




