o3de-atom-sampleviewer/Materials/DiffuseGIExample/white.material

{
    "materialType": "Materials\\Types\\StandardPBR.materialtype",
    "materialTypeVersion": 5,
    "propertyValues": {
        "baseColor.color": [
            1.0,
            1.0,
            1.0,
            1.0
        ],
        "baseColor.useTexture": false,
        "irradiance.manualColor": [
            1.0,
            1.0,
            1.0,
            1.0
        ]
    }
}