o3de-multiplayersample/Materials/basic_grey.material

{
    "materialType": "@gemroot:Atom_Feature_Common@/Assets/Materials/Types/StandardPBR.materialtype",
    "materialTypeVersion": 5,
    "propertyValues": {
        "baseColor.color": [
            0.02720683626830578,
            0.02720683626830578,
            0.02720683626830578,
            1.0
        ]
    }
}