Blender's assign material to face analog

aaii

I have a model of building that was made and imported from Blender. Building has just 2D-textured windows just as faces.

I want to make so called interior mapping. I simply assign needed material to window face and that's all. I made it in Blender, but unfortunately, model with that material is fails to export. So I decided to bring the model (with one whole material) to Godot and then do the same things as in Blender.

Imported model already had texture and some Blender`s material stuff like normal map, but I found how to add material in Godot: I choosed for imported mesh Material -> new ShaderMaterial -> Edit -> new VisualShader (then clicked it) -> in nodes editor I added Texture node with imported texture to "Albedo". It's ok.

But I can't figure out how to assign another material to some face of imported model. Actually, currently I do not understand at all how to select specific face of the imported model.

Megalomaniak

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