loadCubemapAsync( urls, onProgress ) {

		return new Promise( ( resolve, reject ) => {

			this.loadCubemap( urls, resolve, onProgress, reject );

		} );

	}
Async version of {@link RGBMLoader#loadCubemap}.

@async
@param {Array<string>} urls - The paths/URLs of the files to be loaded. This can also be a data URIs.
@param {onProgressCallback} onProgress - Executed while the loading is in progress.
@return {Promise<CubeTexture>} A Promise that resolves with the loaded cube map.