load( urls, onLoad, onProgress, onError ) {

		const texture = new CubeTexture();

		texture.type = this.type;

		switch ( texture.type ) {

			case FloatType:

				texture.colorSpace = LinearSRGBColorSpace;
				texture.minFilter = LinearFilter;
				texture.magFilter = LinearFilter;
				texture.generateMipmaps = false;
				break;

			case HalfFloatType:

				texture.colorSpace = LinearSRGBColorSpace;
				texture.minFilter = LinearFilter;
				texture.magFilter = LinearFilter;
				texture.generateMipmaps = false;
				break;

		}

		const scope = this;

		let loaded = 0;

		function loadHDRData( i, onLoad, onProgress, onError ) {

			new FileLoader( scope.manager )
				.setPath( scope.path )
				.setResponseType( 'arraybuffer' )
				.setWithCredentials( scope.withCredentials )
				.load( urls[ i ], function ( buffer ) {

					loaded ++;

					const texData = scope.hdrLoader.parse( buffer );

					if ( ! texData ) return;

					if ( texData.data !== undefined ) {

						const dataTexture = new DataTexture( texData.data, texData.width, texData.height );

						dataTexture.type = texture.type;
						dataTexture.colorSpace = texture.colorSpace;
						dataTexture.format = texture.format;
						dataTexture.minFilter = texture.minFilter;
						dataTexture.magFilter = texture.magFilter;
						dataTexture.generateMipmaps = texture.generateMipmaps;

						texture.images[ i ] = dataTexture;

					}

					if ( loaded === 6 ) {

						texture.needsUpdate = true;
						if ( onLoad ) onLoad( texture );

					}

				}, onProgress, onError );

		}

		for ( let i = 0; i < urls.length; i ++ ) {

			loadHDRData( i, onLoad, onProgress, onError );

		}

		return texture;

	}
Starts loading from the given URLs and passes the loaded HDR cube texture
to the `onLoad()` callback.

@param {Array<string>} urls - The paths/URLs of the files to be loaded. This can also be a data URIs.
@param {function(CubeTexture)} onLoad - Executed when the loading process has been finished.
@param {onProgressCallback} onProgress - Executed while the loading is in progress.
@param {onErrorCallback} onError - Executed when errors occur.
@return {CubeTexture} The HDR cube texture.