Material options are shown for glTF materials that can't be serialized back right now

[hybridherbst]

Material options that aren't serialized in glTF can't be edited in this mode, we should either disable them or write them to an extension if non-default values are selected:

• Depth Write, Depth Test
• Cast Shadows, Receive Shadows
• Enable Vertex Colors
• Queue Control, Render Queue, Double Sided GI, Global Illumination