constructor( index ) {

		super( null, 'vec4' );

		/**
		 * This flag can be used for type testing.
		 *
		 * @type {boolean}
		 * @readonly
		 * @default true
		 */
		this.isVertexColorNode = true;

		/**
		 * The attribute index to enable more than one sets of vertex colors.
		 *
		 * @type {number}
		 * @default 0
		 */
		this.index = index;

	}
Constructs a new vertex color node.

@param {number} index - The attribute index.