三个js阴影

我一直在tree.js中研究场景，以帮助理解如何创建类似于3dsMax的场景。我正试图添加阴影。

根据我所读到的内容，我应该看到地面上有一个阴影，由lightSpot_Right投射，barStool是遮挡对象。但我不是！如果有人有任何建议，我们将不胜感激！

///webGL - Locking down the Basics
/////////////////////////////////////////////////////////////Environment Settings///////////////////////////////////////////////////////////////////////
///Renderer 
var scene = new THREE.Scene();
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMapEnabled = true;
document.body.appendChild(renderer.domElement);
///Camera's
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
scene.add(camera);
var cubeCamera = new THREE.CubeCamera(1, 1000, 256); // parameters: near, far, resolution
cubeCamera.renderTarget.texture.minFilter = THREE.LinearMipMapLinearFilter; // mipmap filter
scene.add(cubeCamera);
camera.position.set(0, 16, 25);
camera.rotation.x += -0.32;
///Controls

///Lights
var lightSpot_Right = new THREE.SpotLight(0xffffff);
lightSpot_Right.position.set(50, 50, 0);
lightSpot_Right.castShadow = true;
lightSpot_Right.shadowMapWidth = 1024;
lightSpot_Right.shadowMapHeight = 1024;
lightSpot_Right.shadowCameraNear = 500;
lightSpot_Right.shadowCameraFar = 4000;
lightSpot_Right.shadowCameraFov = 30;
scene.add(lightSpot_Right);
var lightDirect_Left = new THREE.DirectionalLight(0xffffff, 0.25);
lightDirect_Left.position.set(-1, 0, 0);
scene.add(lightDirect_Left);
//var lightAmb = new THREE.AmbientLight(0x262626); // soft white light
//scene.add(lightAmb);
///Loaders
var loadTexture = new THREE.TextureLoader();
var loader = new THREE.JSONLoader();
///skyBox
var imagePrefix = "textures/";
var directions = ["skyboxRight", "skyboxLeft", "skyboxTop", "skyboxBottom", "skyboxFront", "skyboxBack"];
var imageSuffix = ".jpg";
var skyMaterialArray = [];
for (var i = 0; i < 6; i++)
    skyMaterialArray.push(new THREE.MeshBasicMaterial({
        map: new THREE.TextureLoader().load(imagePrefix + directions[i] + imageSuffix),
        side: THREE.BackSide
    }));
var skyMaterial = new THREE.MeshFaceMaterial(skyMaterialArray);

var skyGeometry = new THREE.CubeGeometry(500, 500, 500);
var skyBox = new THREE.Mesh(skyGeometry, skyMaterial);
scene.add(skyBox);
var groundPlaneMat = new THREE.MeshPhongMaterial({

})
////////////////////////////////////////////////////////Object Settings//////////////////////////////////////////////////////////////////
//Textures
var seatTexture = loadTexture.load("textures/Maharam_Mister_Notice_Diffuse.jpg");
var conceteDiffuse = loadTexture.load("textures/Contrete_Diffuse.jpg");
var conceteNormal = loadTexture.load("textures/Contrete_Normal.jpg");
var conceteSpecular = loadTexture.load("textures/Contrete_Specular.jpg");
///Materials
var seatMaterial = new THREE.MeshLambertMaterial({
    map: seatTexture,
    side: THREE.doubleside
});
var frameMaterial = new THREE.MeshPhongMaterial({
    envMap: cubeCamera.renderTarget,
    color: 0xcccccc
});
var frameHardwareMat = new THREE.MeshPhongMaterial({
    color: 0x000000
});
var feetMat = new THREE.MeshPhongMaterial({
    color: 0x050505,
    shininess: 99
});
var sphereMat = new THREE.MeshPhongMaterial({
    envMap: cubeCamera.renderTarget
});
var groundMat = new THREE.MeshPhongMaterial({
    map: conceteDiffuse,
    specularMap: conceteSpecular
});
///Geometry and Meshes
var barStool = new THREE.Object3D();
scene.add(barStool);
barStool.castShadow = true;
var seatMesh;
loader.load("models/stoolSeat.js", function (geometry, material) {
    seatMesh = new THREE.Mesh(geometry, seatMaterial);
    seatMesh.scale.set(.5, .5, .5);
    barStool.add(seatMesh);
});
var frameMesh;
loader.load("models/stoolFrame.js", function (geometry, material) {
    frameMesh = new THREE.Mesh(geometry, frameMaterial);
    frameMesh.scale.set(.5, .5, .5);
    barStool.add(frameMesh);
});
var frameFeetMesh;
loader.load("models/stoolFeet.js", function (geometry, material) {
    frameFeetMesh = new THREE.Mesh(geometry, feetMat);
    frameFeetMesh.scale.set(.5, .5, .5);
    barStool.add(frameFeetMesh);
});
var frameHardwareMesh;
loader.load("models/stoolHardware.js", function (geomtry, material) {
    frameHardwareMesh = new THREE.Mesh(geomtry, frameHardwareMat);
    frameHardwareMesh.scale.set(.5, .5, .5);
    barStool.add(frameHardwareMesh);
});

var sphereGeo = new THREE.SphereGeometry(2.5, 50, 50);
var sphereMesh = new THREE.Mesh(sphereGeo, sphereMat);
scene.add(sphereMesh);
sphereMesh.position.set(-10, 5, 0);
var groundGeo = new THREE.PlaneGeometry(100, 50, 1);
var groundMesh = new THREE.Mesh(groundGeo, groundMat);
scene.add(groundMesh);
groundMesh.rotation.x = -90 * Math.PI / 180;
groundMesh.receiveShadow = true;

///Render Scene
var render = function () {
    requestAnimationFrame(render);
    barStool.rotation.y += 0.01;
    sphereMesh.visible = false;
    cubeCamera.position.copy(sphereMesh.position);
    cubeCamera.updateCubeMap(renderer, scene);
    sphereMesh.visible = true;
    /*
    frameMesh.visible = false;
    cubeCamera.position.copy(frameMesh.position);
    cubeCamera.updateCubeMap(renderer, scene);
    frameMesh.visible = true;
    */
    renderer.render(scene, camera);
};
render();