o3de/Gems/PrimitiveAssets/Assets/Objects/_Primitives/_Box_1x1_MiddleGrey.material

{
    "materialType": "@gemroot:Atom_Feature_Common@/Assets/Materials/Types/StandardPBR.materialtype",
    "materialTypeVersion": 5,
    "propertyValues": {
        "baseColor.textureMap": "../../Textures/_Primitives/Middle_Gray_Checker.tif",
        "emissive.color": [
            0.0,
            0.0,
            0.0,
            1.0
        ],
        "normal.textureMap": "../../Textures/_Primitives/Middle_Gray_Checker_ddn.tif",
        "opacity.factor": 1.0,
        "roughness.lowerBound": 0.25,
        "roughness.textureMap": "../../Textures/_Primitives/Middle_Gray_Checker_spec.tif",
        "roughness.upperBound": 0.75
    }
}