constructor( params ) {

		super();

		/**
		 * The pass uniforms.
		 *
		 * @type {Object}
		 */
	 	this.uniforms = UniformsUtils.clone( HalftoneShader.uniforms );

		/**
		 * The pass material.
		 *
		 * @type {ShaderMaterial}
		 */
	 	this.material = new ShaderMaterial( {
	 		uniforms: this.uniforms,
	 		fragmentShader: HalftoneShader.fragmentShader,
	 		vertexShader: HalftoneShader.vertexShader
	 	} );


		for ( const key in params ) {

			if ( params.hasOwnProperty( key ) && this.uniforms.hasOwnProperty( key ) ) {

				this.uniforms[ key ].value = params[ key ];

			}

		}

		// internals

		this._fsQuad = new FullScreenQuad( this.material );

	}
Constructs a new halftone pass.

@param {Object} params - The halftone shader parameter.