Hello,
Is there a way within Substance Painter to export glTF and glb with the alphamode MASK and doubleSided: true ?
Set up a model with an opacity channel that contains a mask. With the alpha-test shader, the model displays correctly in the viewport. When I export the model to glTF it automatically has the alphamode: BLEND and no doublesided in the material properties.
If there's no way to do this now, I hope this can be a new feature in a future release!

Thanks!