constructor( toneMapping, exposureNode = toneMappingExposure, colorNode = null ) {

		super( 'vec3' );

		/**
		 * The tone mapping type.
		 *
		 * @type {number}
		 */
		this.toneMapping = toneMapping;

		/**
		 * The tone mapping exposure.
		 *
		 * @type {Node}
		 * @default null
		 */
		this.exposureNode = exposureNode;

		/**
		 * Represents the color to process.
		 *
		 * @type {?Node}
		 * @default null
		 */
		this.colorNode = colorNode;

	}
Constructs a new tone mapping node.

@param {number} toneMapping - The tone mapping type.
@param {Node} exposureNode - The tone mapping exposure.
@param {Node} [colorNode=null] - The color node to process.