updating dat.gui based on selected object

http://stackoverflow.com/questions/25128277/updating-dat-gui-based-on-selected-object

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5/dat.gui.min.js"></script>
<script src="https://mrdoob.github.com/three.js/build/three.min.js"></script>
<script src="https://mrdoob.github.com/three.js/examples/js/controls/OrbitControls.js"></script>

CSS

body {
    font-family: Monospace;
    background-color: #f0f0f0;
    margin: 0px;
    overflow: hidden;
}

JavaScript

var camera, controls, scene, renderer;
    var cubeHeight = 50;

    init();
    animate();

    function init() {
        // create empty div element in the DOM, we'll add renderer, stats, and gui to this later
        var container = document.createElement('div');
        document.body.appendChild(container);

        // scene
        scene = new THREE.Scene();
        scene.add(new THREE.GridHelper(100, 5));  //GridHelper(size, step)

        // PerspectiveCamera(fov, aspect, near, far )
        camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);
        camera.position.set(0, 10, 20);
        camera.lookAt(scene.position);

        // controls
        controls = new THREE.OrbitControls(camera);

        // renderer
        renderer = new THREE.WebGLRenderer();
        renderer.setClearColor(0xCCCCCC, 1);
        renderer.setSize(window.innerWidth, window.innerHeight);
        container.appendChild(renderer.domElement);

        // Defines the cube and its original position
var cubeHeight = 1; // 0.1;
var boxGeometry = new THREE.BoxGeometry(5, cubeHeight, 5);
        var boxMaterial = new THREE.MeshBasicMaterial({color: 0x880000, transparent: true, opacity: 0.5});
cube = new THREE.Mesh(boxGeometry, boxMaterial);
cube.position.set(0, cubeHeight/2, 0);
scene.add(cube);

var chimneyHeight = 0.5;
var chimneyGeometry = new THREE.BoxGeometry(0.1, chimneyHeight, 0.1);
var chimneyMaterial = new THREE.MeshBasicMaterial({color: 0x000088});  
chimney = new THREE.Mesh(chimneyGeometry, chimneyMaterial);
chimney.position.set(0, cubeHeight+chimneyHeight/2, 0);
scene.add(chimney);

        // GUI PANEL INTERACTION
        // Now the GUI panel for the interaction is defined
        gui = new dat.GUI();

        parameters = {
            depth: 1, height: 1, width: 1,
            tallChimney: 1
        }

        var folder1 = gui.addFolder("House dimensions (cm)");
        folder1.open();

        var cubeX =...