问使用ObjectLoader加载包含具有多个材料的BufferGeometry的JSON不起作用

EN

const materials = [
    new THREE.MeshPhongMaterial({});
    new THREE.ShaderMaterial({ visible: false});
]

const geometry = new THREE.SphereBufferGeometry(2,100,100);
geometry.addGroup(0, Infinity, 0);
geometry.addGroup(0, Infinity, 1);

const mesh = new THREE.Mesh(geometry, materials);
scene.add(mesh);

const loader = new THREE.ObjectLoader();
loader.parse(jsonObject, function(object) {

    // instance is an object containing a bunch of things,
    // including the current scene. 
    // So I replace the current scene with the new one from the JSON

    instance.scene = object;
}

const geometry = new THREE.SphereGeometry(2,100,100);