GLB export loses normal map?

[John_H]

Hi,

I've created a model that needs to be exported as a GLB. It has a texture and a normal map, but when I export as a GLB and upload to sketchfab, the normal map seems to have disappeared (switching normal map on and off has no effect). If I export the same object as an OBJ, the normal map works fine...

Is this a bug, or a feature?! As far as I know, GLBs do support normal maps...

Thanks,
John