分享一套抖音特别火的圣诞树源代码

首先我们要新建一个TXT文档，然后把下面代码复制进去。

<!DOCTYPE html>
<html lang="en" >

body
{
margin: 0;
height: 100vh;
overflow: hidden;
display: flex;
align-items: center;
justify-content: center;
background: #161616;
color: #c5a880;
font-family: sans-serif;
}

label
{
display: inline-block;
background-color: #161616;
padding: 16px;
border-radius: 0.3rem;
cursor: pointer;
margin-top: 1rem;
width: 300px;
border-radius: 10px;
border: 1px solid #c5a880;
text-align: center;
}

ul
{
list-style-type: none;
padding: 0;
margin: 0;
}

.btn
{
background-color: #161616;
border-radius: 10px;
color: #c5a880;
border: 1px solid #c5a880;
padding: 16px;
width: 300px;
margin-bottom: 16px;
line-height: 1.5;
cursor: pointer;
}
.separator
{
font-weight: bold;
text-align: center;
width: 300px;
margin: 16px 0px;
color: #a07676;
}

.title
{
color: #a07676;
font-weight: bold;
font-size: 1.25rem;
margin-bottom: 16px;
}

.text-loading
{
font-size: 2rem;
}
</style>

</head>

<div id="overlay">
<ul>
<li class="title">请选择音乐</li>
<li>
<button class="btn" id="btnA" type="button">
Snowflakes Falling Down by Simon Panrucker
</button>
</li>
<li><button class="btn" id="btnB" type="button">This Christmas by Dott</button></li>
<li><button class="btn" id="btnC" type="button">No room at the inn by TRG Banks</button></li>
<li><button class="btn" id="btnD" type="button">Jingle Bell Swing by Mark Smeby</button></li>
<li class="separator">或者</li>
<li>
<input type="file" id="upload" hidden />
<label for="upload">Upload File</label>
</li>
</ul>
</div>

const map = (value, sMin, sMax, dMin, dMax) => {
return dMin + (value - sMin) / (sMax - sMin) * (dMax - dMin);
};

const range = (n, m = 0) =>
Array(n).
fill(m).
map((i, j) => i + j);

const rand = (max, min = 0) => min + Math.random() * (max - min);
const randInt = (max, min = 0) => Math.floor(min + Math.random() * (max - min));
const randChoise = arr => arr[randInt(arr.length)];
const polar = (ang, r = 1) => [r * cos(ang), r * sin(ang)];

let scene, camera, renderer, analyser;
let step = 0;
const uniforms = {
time: { type: "f", value: 0.0 },
step: { type: "f", value: 0.0 } };

const params = {
exposure: 1,
bloomStrength: 0.9,
bloomThreshold: 0,
bloomRadius: 0.5 };

let composer;

const fftSize = 2048;
const totalPoints = 4000;

const listener = new THREE.AudioListener();

const audio = new THREE.Audio(listener);

document.querySelector("input").addEventListener("change", uploadAudio, false);

const buttons = document.querySelectorAll(".btn");
buttons.forEach((button, index) =>
button.addEventListener("click", () => loadAudio(index)));

function init() {
const overlay = document.getElementById("overlay");
overlay.remove();

scene = new THREE.Scene();
renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

camera = new THREE.PerspectiveCamera(
60,
window.innerWidth / window.innerHeight,
1,
1000);

camera.position.set(-0.09397456774197047, -2.5597086635726947, 24.420789670889008);
camera.rotation.set(0.10443543723052419, -0.003827152981119352, 0.0004011488708739715);

const format = renderer.capabilities.isWebGL2 ?
THREE.RedFormat :
THREE.LuminanceFormat;

uniforms.tAudioData = {
value: new THREE.DataTexture(analyser.data, fftSize / 2, 1, format) };

addPlane(scene, uniforms, 3000);
addSnow(scene, uniforms);

range(10).map(i => {
addTree(scene, uniforms, totalPoints, [20, 0, -20 * i]);
addTree(scene, uniforms, totalPoints, [-20, 0, -20 * i]);
});

const renderScene = new THREE.RenderPass(scene, camera);

const bloomPass = new THREE.UnrealBloomPass(
new THREE.Vector2(window.innerWidth, window.innerHeight),
1.5,
0.4,
0.85);

bloomPass.threshold = params.bloomThreshold;
bloomPass.strength = params.bloomStrength;
bloomPass.radius = params.bloomRadius;

composer = new THREE.EffectComposer(renderer);
composer.addPass(renderScene);
composer.addPass(bloomPass);

addListners(camera, renderer, composer);
animate();
}

function animate(time) {
analyser.getFrequencyData();
uniforms.tAudioData.value.needsUpdate = true;
step = (step + 1) % 1000;
uniforms.time.value = time;
uniforms.step.value = step;
composer.render();
requestAnimationFrame(animate);
}

function loadAudio(i) {
document.getElementById("overlay").innerHTML =
'<div class="text-loading">正在下载音乐，请稍等...</div>';
const files = [
"https://files.freemusicarchive.org/storage-freemusicarchive-org/music/no_curator/Simon_Panrucker/Happy_Christmas_You_Guys/Simon_Panrucker_-_01_-_Snowflakes_Falling_Down.mp3",
"https://files.freemusicarchive.org/storage-freemusicarchive-org/music/no_curator/Dott/This_Christmas/Dott_-_01_-_This_Christmas.mp3",
"https://files.freemusicarchive.org/storage-freemusicarchive-org/music/ccCommunity/TRG_Banks/TRG_Banks_Christmas_Album/TRG_Banks_-_12_-_No_room_at_the_inn.mp3",
"https://files.freemusicarchive.org/storage-freemusicarchive-org/music/ccCommunity/Mark_Smeby/En_attendant_Nol/Mark_Smeby_-_07_-_Jingle_Bell_Swing.mp3"];

const file = files[i];

const loader = new THREE.AudioLoader();
loader.load(file, function (buffer) {
audio.setBuffer(buffer);
audio.play();
analyser = new THREE.AudioAnalyser(audio, fftSize);
init();
});

}

function uploadAudio(event) {
document.getElementById("overlay").innerHTML =
'<div class="text-loading">请稍等...</div>';
const files = event.target.files;
const reader = new FileReader();

reader.onload = function (file) {
var arrayBuffer = file.target.result;

listener.context.decodeAudioData(arrayBuffer, function (audioBuffer) {
audio.setBuffer(audioBuffer);
audio.play();
analyser = new THREE.AudioAnalyser(audio, fftSize);
init();
});
};

reader.readAsArrayBuffer(files[0]);
}

function addTree(scene, uniforms, totalPoints, treePosition) {
const vertexShader = `
attribute float mIndex;
varying vec3 vColor;
varying float opacity;
uniform sampler2D tAudioData;

float norm(float value, float min, float max ){
return (value - min) / (max - min);
}
float lerp(float norm, float min, float max){
return (max - min) * norm + min;
}

float map(float value, float sourceMin, float sourceMax, float destMin, float destMax){
return lerp(norm(value, sourceMin, sourceMax), destMin, destMax);
}

void main() {
vColor = color;
vec3 p = position;
vec4 mvPosition = modelViewMatrix * vec4( p, 1.0 );
float amplitude = texture2D( tAudioData, vec2( mIndex, 0.1 ) ).r;
float amplitudeClamped = clamp(amplitude-0.4,0.0, 0.6 );
float sizeMapped = map(amplitudeClamped, 0.0, 0.6, 1.0, 20.0);
opacity = map(mvPosition.z , -200.0, 15.0, 0.0, 1.0);
gl_PointSize = sizeMapped * ( 100.0 / -mvPosition.z );
gl_Position = projectionMatrix * mvPosition;
}
`;
const fragmentShader = `
varying vec3 vColor;
varying float opacity;
uniform sampler2D pointTexture;
void main() {
gl_FragColor = vec4( vColor, opacity );
gl_FragColor = gl_FragColor * texture2D( pointTexture, gl_PointCoord );
}
`;
const shaderMaterial = new THREE.ShaderMaterial({
uniforms: {
...uniforms,
pointTexture: {
value: new THREE.TextureLoader().load(`https://assets.codepen.io/3685267/spark1.png`) } },

vertexShader,
fragmentShader,
blending: THREE.AdditiveBlending,
depthTest: false,
transparent: true,
vertexColors: true });

const geometry = new THREE.BufferGeometry();
const positions = [];
const colors = [];
const sizes = [];
const phases = [];
const mIndexs = [];

const color = new THREE.Color();

for (let i = 0; i < totalPoints; i++) {
const t = Math.random();
const y = map(t, 0, 1, -8, 10);
const ang = map(t, 0, 1, 0, 6 * TAU) + TAU / 2 * (i % 2);
const [z, x] = polar(ang, map(t, 0, 1, 5, 0));

const modifier = map(t, 0, 1, 1, 0);
positions.push(x + rand(-0.3 * modifier, 0.3 * modifier));
positions.push(y + rand(-0.3 * modifier, 0.3 * modifier));
positions.push(z + rand(-0.3 * modifier, 0.3 * modifier));

color.setHSL(map(i, 0, totalPoints, 1.0, 0.0), 1.0, 0.5);

colors.push(color.r, color.g, color.b);
phases.push(rand(1000));
sizes.push(1);
const mIndex = map(i, 0, totalPoints, 1.0, 0.0);
mIndexs.push(mIndex);
}

geometry.setAttribute(
"position",
new THREE.Float32BufferAttribute(positions, 3).setUsage(
THREE.DynamicDrawUsage));

geometry.setAttribute("color", new THREE.Float32BufferAttribute(colors, 3));
geometry.setAttribute("size", new THREE.Float32BufferAttribute(sizes, 1));
geometry.setAttribute("phase", new THREE.Float32BufferAttribute(phases, 1));
geometry.setAttribute("mIndex", new THREE.Float32BufferAttribute(mIndexs, 1));

const tree = new THREE.Points(geometry, shaderMaterial);

const [px, py, pz] = treePosition;

tree.position.x = px;
tree.position.y = py;
tree.position.z = pz;

scene.add(tree);
}

function addSnow(scene, uniforms) {
const vertexShader = `
attribute float size;
attribute float phase;
attribute float phaseSecondary;

varying vec3 vColor;
varying float opacity;

uniform float time;
uniform float step;

float norm(float value, float min, float max ){
return (value - min) / (max - min);
}
float lerp(float norm, float min, float max){
return (max - min) * norm + min;
}

float map(float value, float sourceMin, float sourceMax, float destMin, float destMax){
return lerp(norm(value, sourceMin, sourceMax), destMin, destMax);
}
void main() {
float t = time* 0.0006;

vColor = color;

vec3 p = position;

p.y = map(mod(phase+step, 1000.0), 0.0, 1000.0, 25.0, -8.0);

p.x += sin(t+phase);
p.z += sin(t+phaseSecondary);

opacity = map(p.z, -150.0, 15.0, 0.0, 1.0);

vec4 mvPosition = modelViewMatrix * vec4( p, 1.0 );

gl_PointSize = size * ( 100.0 / -mvPosition.z );

gl_Position = projectionMatrix * mvPosition;

}
`;

const fragmentShader = `
uniform sampler2D pointTexture;
varying vec3 vColor;
varying float opacity;

void main() {
gl_FragColor = vec4( vColor, opacity );
gl_FragColor = gl_FragColor * texture2D( pointTexture, gl_PointCoord );
}
`;
function createSnowSet(sprite) {
const totalPoints = 300;
const shaderMaterial = new THREE.ShaderMaterial({
uniforms: {
...uniforms,
pointTexture: {
value: new THREE.TextureLoader().load(sprite) } },

vertexShader,
fragmentShader,
blending: THREE.AdditiveBlending,
depthTest: false,
transparent: true,
vertexColors: true });

const geometry = new THREE.BufferGeometry();
const positions = [];
const colors = [];
const sizes = [];
const phases = [];
const phaseSecondaries = [];

const color = new THREE.Color();

for (let i = 0; i < totalPoints; i++) {
const [x, y, z] = [rand(25, -25), 0, rand(15, -150)];
positions.push(x);
positions.push(y);
positions.push(z);

color.set(randChoise(["#f1d4d4", "#f1f6f9", "#eeeeee", "#f1f1e8"]));

colors.push(color.r, color.g, color.b);
phases.push(rand(1000));
phaseSecondaries.push(rand(1000));
sizes.push(rand(4, 2));
}

geometry.setAttribute(
"position",
new THREE.Float32BufferAttribute(positions, 3));

geometry.setAttribute("color", new THREE.Float32BufferAttribute(colors, 3));
geometry.setAttribute("size", new THREE.Float32BufferAttribute(sizes, 1));
geometry.setAttribute("phase", new THREE.Float32BufferAttribute(phases, 1));
geometry.setAttribute(
"phaseSecondary",
new THREE.Float32BufferAttribute(phaseSecondaries, 1));

const mesh = new THREE.Points(geometry, shaderMaterial);

scene.add(mesh);
}
const sprites = [
"https://assets.codepen.io/3685267/snowflake1.png",
"https://assets.codepen.io/3685267/snowflake2.png",
"https://assets.codepen.io/3685267/snowflake3.png",
"https://assets.codepen.io/3685267/snowflake4.png",
"https://assets.codepen.io/3685267/snowflake5.png"];

sprites.forEach(sprite => {
createSnowSet(sprite);
});
}

function addPlane(scene, uniforms, totalPoints) {
const vertexShader = `
attribute float size;
attribute vec3 customColor;
varying vec3 vColor;

void main() {
vColor = customColor;
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_PointSize = size * ( 300.0 / -mvPosition.z );
gl_Position = projectionMatrix * mvPosition;

}
`;
const fragmentShader = `
uniform vec3 color;
uniform sampler2D pointTexture;
varying vec3 vColor;

void main() {
gl_FragColor = vec4( vColor, 1.0 );
gl_FragColor = gl_FragColor * texture2D( pointTexture, gl_PointCoord );

}
`;
const shaderMaterial = new THREE.ShaderMaterial({
uniforms: {
...uniforms,
pointTexture: {
value: new THREE.TextureLoader().load(`https://assets.codepen.io/3685267/spark1.png`) } },

vertexShader,
fragmentShader,
blending: THREE.AdditiveBlending,
depthTest: false,
transparent: true,
vertexColors: true });

const geometry = new THREE.BufferGeometry();
const positions = [];
const colors = [];
const sizes = [];

const color = new THREE.Color();

for (let i = 0; i < totalPoints; i++) {
const [x, y, z] = [rand(-25, 25), 0, rand(-150, 15)];
positions.push(x);
positions.push(y);
positions.push(z);

color.set(randChoise(["#93abd3", "#f2f4c0", "#9ddfd3"]));

colors.push(color.r, color.g, color.b);
sizes.push(1);
}

geometry.setAttribute(
"position",
new THREE.Float32BufferAttribute(positions, 3).setUsage(
THREE.DynamicDrawUsage));

geometry.setAttribute(
"customColor",
new THREE.Float32BufferAttribute(colors, 3));

geometry.setAttribute("size", new THREE.Float32BufferAttribute(sizes, 1));

const plane = new THREE.Points(geometry, shaderMaterial);

plane.position.y = -8;
scene.add(plane);
}

window.addEventListener(
"resize",
() => {
const width = window.innerWidth;
const height = window.innerHeight;

camera.aspect = width / height;
camera.updateProjectionMatrix();

renderer.setSize(width, height);
composer.setSize(width, height);
},
false);

}
</script>

</body>

</html>

然后报存，把文件后缀名称改为.html 再用浏览器打开它就可以看到效果啦~

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