Estoy siguiendoesta Tutorial sobre cómo cargar modelos mayas con Three.js.

Todo está bien, pero el tutorial solo explica cómo cargar modelos con una textura.

Aquí está el código fuente del tutorial:

function createScene(geometry, x, y, z, scale, tmap) {
            zmesh = new THREE.Mesh(geometry, new THREE.MeshLambertMaterial({map: THREE.ImageUtils.loadTexture(tmap)}));
            zmesh.position.set(x, y, z);
            zmesh.scale.set(scale, scale, scale);
            meshes.push(zmesh);
            scene.add(zmesh);
        }

JS completoEnlace en vivo

            var SCREEN_WIDTH = window.innerWidth;
        var SCREEN_HEIGHT = window.innerHeight;

        var container;

        var camera, scene;
        var canvasRenderer, webglRenderer;

        var mesh, zmesh, geometry, materials;

        var windowHalfX = window.innerWidth / 2;
        var windowHalfY = window.innerHeight / 2;

        var meshes = [];

        init();
        animate();

        function init() {

            container = document.createElement('div');
            document.body.appendChild(container);

            camera = new THREE.PerspectiveCamera(75, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 100000);
            camera.position.x = 400;
            camera.position.y = 200;
            camera.position.z = 400;

            scene = new THREE.Scene();

            // LIGHTS
            var ambient = new THREE.AmbientLight(0x666666);
            scene.add(ambient);

            var directionalLight = new THREE.DirectionalLight(0xffeedd);
            directionalLight.position.set(0, 70, 100).normalize();
            scene.add(directionalLight);

            // RENDERER
            webglRenderer = new THREE.WebGLRenderer();
            webglRenderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
            webglRenderer.domElement.style.position = "relative";

            container.appendChild(webglRenderer.domElement);
            var loader = new THREE.JSONLoader(),
                callbackKey = function (geometry, materials) {
                    createScene(geometry, materials, 0, 0, 0, 6);
                };
            loader.load("chameleon.js", callbackKey);

            window.addEventListener('resize', onWindowResize, false);

        }

        function createScene(geometry, materials, x, y, z, scale) {


            zmesh = new THREE.Mesh(geometry, new THREE.MeshFaceMaterial(materials));
            zmesh.position.set(x, y, z);
            zmesh.scale.set(scale, scale, scale);
            meshes.push(zmesh);
            scene.add(zmesh);

        }

        function onWindowResize() {

            windowHalfX = window.innerWidth / 2;
            windowHalfY = window.innerHeight / 2;

            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();

            webglRenderer.setSize(window.innerWidth, window.innerHeight);
        }

        function animate() {
            for (var i = 0; i < meshes.length; i++) {
                meshes[i].rotation.y += 0.01;
            }
            requestAnimationFrame(animate);
            render();
        }

        function render() {
            camera.lookAt(scene.position);
            webglRenderer.render(scene, camera);
        }

Pero mi modelo tiene cuatro texturas. ¿Qué debo cambiar para cargarlos todos?Enlace en vivo