请给出three.js局部辉光的代码案例

以下是一个three.js局部辉光的代码案例：

// 创建一个场景
var scene = new THREE.Scene();

// 创建一个相机
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);

// 创建一个渲染器
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// 创建一个立方体
var geometry = new THREE.BoxGeometry(1, 1, 1);
var material = new THREE.MeshBasicMaterial({ color: 0xffffff });
var cube = new THREE.Mesh(geometry, material);
scene.add(cube);

// 创建一个局部辉光效果
var glowMaterial = new THREE.ShaderMaterial({
  uniforms: {
    "c": { type: "f", value: 0.3 },
    "p": { type: "f", value: 5.0 },
    glowColor: { type: "c", value: new THREE.Color(0x00ffff) },
    viewVector: { type: "v3", value: camera.position }
  },
  vertexShader: document.getElementById('vertexShader').textContent,
  fragmentShader: document.getElementById('fragmentShader').textContent,
  side: THREE.FrontSide,
  blending: THREE.AdditiveBlending,
  transparent: true
});

// 将局部辉光效果应用到立方体上
var glowCube = new THREE.Mesh(geometry.clone(), glowMaterial.clone());
glowCube.position = cube.position;
glowCube.scale.multiplyScalar(1.2);
scene.add(glowCube);

// 渲染场景
function render() {
  requestAnimationFrame(render);

  // 更新局部辉光效果的视角
  glowMaterial.uniforms.viewVector.value = new THREE.Vector3().subVectors(camera.position, glowCube.position);

  renderer.render(scene, camera);
}
render();

其中，vertexShader 和 fragmentShader 分别是顶点着色器和片元着色器的代码，可以在 HTML 中定义：

<script id="vertexShader" type="x-shader/x-vertex">
  uniform vec3 viewVector;
  uniform float c;
  uniform float p;
  varying float intensity;
  void main() {
    vec3 vNormal = normalize(normalMatrix * normal);
    vec3 vNormel = normalize(normalMatrix * viewVector);
    intensity = pow(c - dot(vNormal, vNormel), p);
    gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
  }
</script>

<script id="fragmentShader" type="x-shader/x-fragment">
  uniform vec3 glowColor;
  varying float intensity;
  void main() {
    vec3 glow = glowColor * intensity;
    gl_FragColor = vec4(glow, 1.0);
  }
</script>