getDefaultUV() {

		const texture = this.value;

		if ( texture.mapping === CubeReflectionMapping ) {

			return reflectVector;

		} else if ( texture.mapping === CubeRefractionMapping ) {

			return refractVector;

		} else {

			console.error( 'THREE.CubeTextureNode: Mapping "%s" not supported.', texture.mapping );

			return vec3( 0, 0, 0 );

		}

	}
Returns a default uvs based on the mapping type of the cube texture.

@return {Node<vec3>} The default uv attribute.