  };
        const groupLayer = new maptalks.GroupGLLayer('group', [baseLayer,threeLayer], { sceneConfig, onlyWebGL1: true });
        groupLayer.addTo(map);

        var gltfLoader = new THREE.GLTFLoader();

        function loadModel(modelUrl, callback) {
            gltfLoader.load(modelUrl, function (gltf) {
                const model = gltf.scene;
                model.position.set(0, 0, 0);
                const box = new THREE.Box3().setFromObject(model);
                const center = new THREE.Vec