async load(url, onProgress) {
            const loaded = (await this.loader.loadAsync(url, onProgress));
            const mesh = loaded.scene;
            const modelID = this.getModelID();
            this.GLTFModels[modelID] = mesh;
            this.context.getScene().add(mesh);
            return mesh;
        }
Loads any glTF file into the scene using [Three.js loader](https://threejs.org/docs/#examples/en/loaders/GLTFLoader).
@url The URL of the GLTF file to load
@onProgress (optional) A callback function that is called when the file is loaded