小盆友进来听听巫娜姐姐的《飞升》

马黑黑 · 发表于 2025-5-6 19:46

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马黑黑 · 发表于 2025-5-6 19:48

帖子代码（threejs 特效源于 threejs 的一个公开示例）：

<style>
#tz { --state: running; margin: 30px 0; left: calc(50% - 81px); transform: translateX(-50%); width: clamp(600px, 90vw, 1400px); min-height: 80vh; aspect-ratio: 16/9; background: #666 url('https://638183.freep.cn/638183/t24/webp3/scene.webp') no-repeat center/cover; box-shadow: 2px 2px 10px rgba(0,0,0,.65); z-index: 1; position: relative; }
#player { position: absolute; left: 3%; top: 2%; z-index: 9; clip-path: circle(45%); transition: filter .7s; cursor: pointer; animation: rot 2s infinite linear var(--state); }
#player:hover { filter: hue-rotate(120deg); }
#btnFs { left: 4.5%; top: 22%; width: 5%; color: #eee; text-align: center; }
#btnFs:hover { color: red; }
@keyframes rot { to { transform: rotate(360deg); } }
</style>
<div id="tz">
<audio id="aud" src="https://music.163.com/song/media/outer/url?id=304962" autoplay loop></audio>
<img id="player" src="https://638183.freep.cn/638183/small/202501.png" width="10%" title="播放/暂停" />
</div>
<script type="importmap">
{
"imports": {
"three": "https://esm.sh/three@0.176.0?target=es2022",
"three/addons/": "https://esm.sh/three@0.176.0/addons/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import { RapierPhysics } from 'three/addons/physics/RapierPhysics.js';
import { FS } from 'https://638183.freep.cn/638183/web/ku/fscreen.js';
let camera, scene, renderer;
let physics, position;
let boxes, spheres;
init();
FS(tz, player);
async function init() {
physics = await RapierPhysics();
position = new THREE.Vector3();
camera = new THREE.PerspectiveCamera(50, tz.offsetWidth / tz.offsetHeight, 0.1, 100);
camera.position.set(- 1, 1.5, 5);
camera.lookAt(0, 0.5, 0);
scene = new THREE.Scene();
const hemiLight = new THREE.HemisphereLight();
scene.add(hemiLight);
const dirLight = new THREE.DirectionalLight(0xffffff, 3);
dirLight.position.set(5, 5, 5);
dirLight.castShadow = true;
dirLight.shadow.camera.zoom = 2;
scene.add(dirLight);
const shadowPlane = new THREE.Mesh(
new THREE.PlaneGeometry(10, 10),
new THREE.ShadowMaterial({
color: 0x444444
}),
);
shadowPlane.rotation.x = - Math.PI / 2;
shadowPlane.receiveShadow = true;
scene.add(shadowPlane);
const floorCollider = new THREE.Mesh(
new THREE.BoxGeometry(10, 5, 10),
new THREE.MeshBasicMaterial({ color: 0x666666 })
);
floorCollider.position.y = - 2.5;
floorCollider.userData.physics = { mass: 0 };
floorCollider.visible = false;
scene.add(floorCollider);
const material = new THREE.MeshLambertMaterial();
const matrix = new THREE.Matrix4();
const color = new THREE.Color();
const geometryBox = new THREE.BoxGeometry(0.075, 0.075, 0.075);
boxes = new THREE.InstancedMesh(geometryBox, material, 400);
boxes.instanceMatrix.setUsage(THREE.DynamicDrawUsage);
boxes.castShadow = true;
boxes.receiveShadow = true;
boxes.userData.physics = { mass: 1 };
scene.add(boxes);
for (let i = 0; i < boxes.count; i ++) {
matrix.setPosition(Math.random() - 0.5, Math.random() * 2, Math.random() - 0.5);
boxes.setMatrixAt(i, matrix);
boxes.setColorAt(i, color.setHex(0xffffff * Math.random()));
}
const geometrySphere = new THREE.IcosahedronGeometry(0.05, 4);
spheres = new THREE.InstancedMesh(geometrySphere, material, 400);
spheres.instanceMatrix.setUsage(THREE.DynamicDrawUsage);
spheres.castShadow = true;
spheres.receiveShadow = true;
spheres.userData.physics = { mass: 1 };
scene.add(spheres);
for (let i = 0; i < spheres.count; i ++) {
matrix.setPosition(Math.random() - 0.5, Math.random() * 2, Math.random() - 0.5);
spheres.setMatrixAt(i, matrix);
spheres.setColorAt(i, color.setHex(0xffffff * Math.random()));
}
physics.addScene(scene);
renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(tz.offsetWidth, tz.offsetHeight);
renderer.setAnimationLoop(animate);
renderer.shadowMap.enabled = true;
tz.appendChild(renderer.domElement);
const controls = new OrbitControls(camera, renderer.domElement);
controls.target.y = 0.5;
controls.update();
setInterval(() => {
let index = Math.floor(Math.random() * boxes.count);
position.set(0, Math.random() + 1, 0);
physics.setMeshPosition(boxes, position, index);
index = Math.floor(Math.random() * spheres.count);
position.set(0, Math.random() + 1, 0);
physics.setMeshPosition(spheres, position, index);
}, 1000 / 60);
window.addEventListener('resize', onWindowResize);
}
function onWindowResize() {
camera.aspect = tz.offsetWidth / tz.offsetHeight;
camera.updateProjectionMatrix();
renderer.setSize(tz.offsetWidth, tz.offsetHeight);
}
function animate() {
if (aud.paused) return;
renderer.render(scene, camera);
}
</script>

复制代码

马黑黑 · 发表于 2025-5-6 19:56

本帖特效的核心在于 RapierPhysics，这是一个模拟物理现象的API库，里面包含引力对物体的作用、物体运动过程中的惯性、边界与碰撞等等，做的十分齐全。

光源也是重要的核心内容。示例中使用了两种光源，一个负责对3d对象的渲染，里一个负责阴影的营造。

Threejs的示例是全屏模式即整个页面用于渲染效果，所有的示例都是这样。帖子将其作为帖子容器的子内容，这样符合做帖规范。