setupOutput( builder, outputNode ) {

		// FOG

		if ( this.fog === true ) {

			outputNode = this.setupFog( builder, outputNode );

		}

		// PREMULTIPLIED ALPHA

		if ( this.premultipliedAlpha === true ) {

			outputNode = this.setupPremultipliedAlpha( builder, outputNode );

		}

		return outputNode;

	}
Setups the output node.

@param {NodeBuilder} builder - The current node builder.
@param {Node<vec4>} outputNode - The existing output node.
@return {Node<vec4>} The output node.