; (function (Cesium) {
    checkSkyScenery(Cesium);
    function addTree(jsonUrl, gltfUrl) {
        return new Promise((resolve, reject) => {
            $.getJSON(jsonUrl, function (obj) {
                let keyArr = Object.keys(obj);
                let objectArr = Object.values(obj);
                let primitiveArr = keyArr.map(function (key, index) {
                    return loadBigDataGltf(objectArr[index].positions, key, gltfUrl);
                });
                resolve(primitiveArr);
            });
        });
    }
    // 加载大批量gltf文件
    function loadBigDataGltf(array, gltfName, gltfUrl) {
        let instances = [];
        for (let i = 0; i < array.length; i++) {
            let modelMatrix = Cesium.Transforms.headingPitchRollToFixedFrame(
                Cesium.Cartesian3.fromRadians(array[i], array[i + 1], 5),
                new Cesium.HeadingPitchRoll(0, 0, 0)
            );
            Cesium.Matrix4.multiplyByUniformScale(modelMatrix, 1, modelMatrix); // 缩放
            instances.push({
                modelMatrix: modelMatrix,
            });
        }

        let primitive = new Cesium.ModelInstanceCollection({
            // url: "./static/gltf/" + gltfName + ".gltf",
            url: gltfUrl + gltfName + ".gltf",
            instances: instances,
        });

        return primitive
        // globalVariable.viewer.scene.primitives.add(primitive);
    }
    Cesium.addTree = addTree;
}(SkyScenery))