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    Variable METAL_ROUGHNESS_TEXTURE_UNITConst

    METAL_ROUGHNESS_TEXTURE_UNIT: 2

    Packed metallic-roughness map unit (StandardMaterial.metalRoughnessMap). Unit 2: 0 is albedo, 1 is the shadow map that stays live across a shaded draw. Node-material samplers also start at 2 and overwrite this unit on their own draws — never simultaneous. Unbound in render's finally.