addMaterials( materials ) {

		for ( let i = 0, l = materials.length; i < l; i ++ ) {

			this.addMaterial( materials[ i ] );

		}

		return this;

	}
Adds a list of materials to the loader's material library.

@param {Array<Material>} materials - The materials to add.
@return {LDrawLoader} A reference to this loader.