three.js中使用PlaneBufferGeometry和ShaderMaterial实现水晶球效果

要实现水晶球效果，可以按照以下步骤进行：

1. 创建一个球体，并使用PlaneBufferGeometry替换默认的球体几何体。

let geometry = new THREE.PlaneBufferGeometry(1, 1, 32, 32);

2. 创建一个ShaderMaterial，并使用GLSL编写着色器代码。

let material = new THREE.ShaderMaterial({
    vertexShader: document.getElementById('vertexShader').textContent,
    fragmentShader: document.getElementById('fragmentShader').textContent,
    uniforms: {
        uTime: { value: 0 },
        uResolution: { value: new THREE.Vector2() },
        uTexture: { value: null }
    }
});

其中，uniforms是传递给着色器的参数，uTime表示时间，uResolution表示屏幕分辨率，uTexture表示贴图。

3. 将着色器代码写入HTML中，并使用JavaScript获取。

<script type="x-shader/x-vertex" id="vertexShader">
    // vertex shader code
</script>

<script type="x-shader/x-fragment" id="fragmentShader">
    // fragment shader code
</script>

4. 加载一个纹理贴图，并传递给ShaderMaterial。

let texture = new THREE.TextureLoader().load('texture.png');
material.uniforms.uTexture.value = texture;

5. 在渲染循环中更新时间，并将屏幕分辨率传递给ShaderMaterial。

function render() {
    requestAnimationFrame(render);

    material.uniforms.uTime.value += 0.1;
    material.uniforms.uResolution.value.set(window.innerWidth, window.innerHeight);

    renderer.render(scene, camera);
}

6. 将球体添加到场景中，并使用ShaderMaterial进行渲染。

let sphere = new THREE.Mesh(geometry, material);
scene.add(sphere);

完整代码如下：

HTML：

<script type="x-shader/x-vertex" id="vertexShader">
    void main() {
        gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
    }
</script>

<script type="x-shader/x-fragment" id="fragmentShader">
    uniform float uTime;
    uniform vec2 uResolution;
    uniform sampler2D uTexture;

    void main() {
        vec2 uv = gl_FragCoord.xy / uResolution.xy;
        uv.y += uTime * 0.05;

        vec4 color = texture2D(uTexture, uv);
        gl_FragColor = color;
    }
</script>

<script>
    let renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild(renderer.domElement);

    let camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000);
    camera.position.z = 5;

    let scene = new THREE.Scene();

    let geometry = new THREE.PlaneBufferGeometry(1, 1, 32, 32);

    let material = new THREE.ShaderMaterial({
        vertexShader: document.getElementById('vertexShader').textContent,
        fragmentShader: document.getElementById('fragmentShader').textContent,
        uniforms: {
            uTime: { value: 0 },
            uResolution: { value: new THREE.Vector2() },
            uTexture: { value: null }
        }
    });

    let texture = new THREE.TextureLoader().load('texture.png');
    material.uniforms.uTexture.value = texture;

    let sphere = new THREE.Mesh(geometry, material);
    scene.add(sphere);

    function render() {
        requestAnimationFrame(render);

        material.uniforms.uTime.value += 0.1;
        material.uniforms.uResolution.value.set(window.innerWidth, window.innerHeight);

        renderer.render(scene, camera);
    }

    render();
</script>