示例

HTML

.p-summaryh1 Butterflypa(href="https://ykob.github.io/sketch-threejs/sketch/butterfly.html", target="_blank")|this source.canvas(id="canvas-webgl", class="p-canvas-webgl")

CSS

@import url('https://fonts.googleapis.com/css?family=Homenaje');.p-canvas-webgl {position: fixed;z-index: 1;top: 0; left: 0;
}.p-summary {position: absolute;top: 20px; left: 20px;z-index: 2;color: #111;font-family: 'Homenaje', sans-serif;h1 {margin: 0 0 0.8em;font-size: 5px;font-weight: 400;letter-spacing: 0.05em;}p {margin: 0;font-size: 1.1rem;letter-spacing: 0.1em;}a {color: #1FFFF;}
}

JS

class ConsoleSignature {constructor() {this.message = `created by yoichi kobayashi`;this.url = `http://www.tplh.net`;this.show();}show() {if (navigator.userAgent.toLowerCase().indexOf('chrome') > -1) {const args = [`\n%c ${this.message} %c%c ${this.url} \n\n`,'color: #fff; background: #222; padding:3px 0;','padding:3px 1px;','color: #fff; background: #47c; padding:3px 0;',];console.log.apply(console, args);} else if (window.console) {console.log(`${this.message} ${this.url}`);}}
}const debounce = (callback, duration) => {var timer;return function(event) {clearTimeout(timer);timer = setTimeout(function(){callback(event);}, duration);};
};const SIZE = 280;class Butterfly {constructor(i, texture) {this.uniforms = {index: {type: 'f',value: i},time: {type: 'f',value: 0},size: {type: 'f',value: SIZE},texture: {type: 't',value: texture},}this.physicsRenderer = null;this.obj = this.createObj();}createObj() {const geometry = new THREE.PlaneBufferGeometry(SIZE, SIZE / 3, 48, 24);const mesh = new THREE.Mesh(geometry,new THREE.RawShaderMaterial({uniforms: this.uniforms,vertexShader: `attribute vec3 position;
attribute vec2 uv;uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
uniform float index;
uniform float time;
uniform float size;varying vec3 vPosition;
varying vec2 vUv;void main() {float flapTime = radians(sin(time * 6.0 - length(position.xy) / size * 2.6 + index * 2.0) * 45.0 + 30.0);float hovering = cos(time * 2.0 + index * 3.0) * size / 16.0;vec3 updatePosition = vec3(cos(flapTime) * position.x,position.y + hovering,sin(flapTime) * abs(position.x) + hovering);vec4 mvPosition = modelViewMatrix * vec4(updatePosition, 1.0);vPosition = position;vUv = uv;gl_Position = projectionMatrix * mvPosition;
}
`,fragmentShader: `precision highp float;uniform float index;
uniform float time;
uniform float size;
uniform sampler2D texture;varying vec3 vPosition;
varying vec2 vUv;//
// Description : Array and textureless GLSL 2D/3D/4D simplex
//               noise functions.
//      Author : Ian McEwan, Ashima Arts.
//  Maintainer : ijm
//     Lastmod : 20110822 (ijm)
//     License : Copyright (C) 2011 Ashima Arts. All rights reserved.
//               Distributed under the MIT License. See LICENSE file.
//               https://github.com/ashima/webgl-noise
//vec3 mod289(vec3 x) {return x - floor(x * (1.0 / 289.0)) * 289.0;
}vec4 mod289(vec4 x) {return x - floor(x * (1.0 / 289.0)) * 289.0;
}vec4 permute(vec4 x) {return mod289(((x*34.0)+1.0)*x);
}vec4 taylorInvSqrt(vec4 r)
{return 1.79284291400159 - 0.85373472095314 * r;
}float snoise3(vec3 v){const vec2  C = vec2(1.0/6.0, 1.0/3.0) ;const vec4  D = vec4(0.0, 0.5, 1.0, 2.0);// First cornervec3 i  = floor(v + dot(v, C.yyy) );vec3 x0 =   v - i + dot(i, C.xxx) ;// Other cornersvec3 g = step(x0.yzx, x0.xyz);vec3 l = 1.0 - g;vec3 i1 = min( g.xyz, l.zxy );vec3 i2 = max( g.xyz, l.zxy );//   x0 = x0 - 0.0 + 0.0 * C.xxx;//   x1 = x0 - i1  + 1.0 * C.xxx;//   x2 = x0 - i2  + 2.0 * C.xxx;//   x3 = x0 - 1.0 + 3.0 * C.xxx;vec3 x1 = x0 - i1 + C.xxx;vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.yvec3 x3 = x0 - D.yyy;      // -1.0+3.0*C.x = -0.5 = -D.y// Permutationsi = mod289(i);vec4 p = permute( permute( permute(i.z + vec4(0.0, i1.z, i2.z, 1.0 ))+ i.y + vec4(0.0, i1.y, i2.y, 1.0 ))+ i.x + vec4(0.0, i1.x, i2.x, 1.0 ));// Gradients: 7x7 points over a square, mapped onto an octahedron.
// The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294)float n_ = 0.142857142857; // 1.0/7.0vec3  ns = n_ * D.wyz - D.xzx;vec4 j = p - 49.0 * floor(p * ns.z * ns.z);  //  mod(p,7*7)vec4 x_ = floor(j * ns.z);vec4 y_ = floor(j - 7.0 * x_ );    // mod(j,N)vec4 x = x_ *ns.x + ns.yyyy;vec4 y = y_ *ns.x + ns.yyyy;vec4 h = 1.0 - abs(x) - abs(y);vec4 b0 = vec4( x.xy, y.xy );vec4 b1 = vec4( x.zw, y.zw );//vec4 s0 = vec4(lessThan(b0,0.0))*2.0 - 1.0;//vec4 s1 = vec4(lessThan(b1,0.0))*2.0 - 1.0;vec4 s0 = floor(b0)*2.0 + 1.0;vec4 s1 = floor(b1)*2.0 + 1.0;vec4 sh = -step(h, vec4(0.0));vec4 a0 = b0.xzyw + s0.xzyw*sh.xxyy ;vec4 a1 = b1.xzyw + s1.xzyw*sh.zzww ;vec3 p0 = vec3(a0.xy,h.x);vec3 p1 = vec3(a0.zw,h.y);vec3 p2 = vec3(a1.xy,h.z);vec3 p3 = vec3(a1.zw,h.w);//Normalise gradientsvec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3)));p0 *= norm.x;p1 *= norm.y;p2 *= norm.z;p3 *= norm.w;// Mix final noise valuevec4 m = max(0.6 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0);m = m * m;return 42.0 * dot( m*m, vec4( dot(p0,x0), dot(p1,x1),dot(p2,x2), dot(p3,x3) ) );}vec3 convertHsvToRgb(vec3 c) {vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}void main() {vec4 texColor = texture2D(texture, vUv);float noise = snoise3(vPosition / vec3(size * 0.25) + vec3(0.0, 0.0, time));vec3 hsv = vec3(1.0 + noise * 0.2 + index * 0.7, 0.4, 1.0);vec3 rgb = convertHsvToRgb(hsv);gl_FragColor = vec4(rgb, 1.0) * texColor;
}`,depthWrite: false,side: THREE.DoubleSide,transparent: true}));mesh.rotation.set(-45 * Math.PI / 180, 0, 0);return mesh;}render(renderer, time) {this.uniforms.time.value += time;this.obj.position.z = (this.obj.position.z > -900) ? this.obj.position.z - 4 : 900;}
}const resolution = {x: 0,y: 0
};
const canvas = document.getElementById('canvas-webgl');
const renderer = new THREE.WebGLRenderer({antialias: false,canvas: canvas,
});
const scene = new THREE.Scene();
const camera = new THREE.OrthographicCamera(-1, 1, 1, -1, 1, 10000);
const clock = new THREE.Clock();
const loader = new THREE.TextureLoader();const vectorTouchStart = new THREE.Vector2();
const vectorTouchMove = new THREE.Vector2();
const vectorTouchEnd = new THREE.Vector2();const CAMERA_SIZE_X = 640;
const CAMERA_SIZE_Y = 480;const BUTTERFLY_NUM = 7;
const butterflies = [];const resizeCamera = () => {const x = Math.min((resolution.x / resolution.y) / (CAMERA_SIZE_X / CAMERA_SIZE_Y), 1.0) * CAMERA_SIZE_X;const y = Math.min((resolution.y / resolution.x) / (CAMERA_SIZE_Y / CAMERA_SIZE_X), 1.0) * CAMERA_SIZE_Y;camera.left   = x * -0.5;camera.right  = x *  0.5;camera.top    = y *  0.5;camera.bottom = y * -0.5;camera.updateProjectionMatrix();
};
const resizeWindow = () => {resolution.x = window.innerWidth;resolution.y = window.innerHeight;canvas.width = resolution.x;canvas.height = resolution.y;resizeCamera();renderer.setSize(resolution.x, resolution.y);
}
const render = () => {const time = clock.getDelta();for (var i = 0; i < butterflies.length; i++) {butterflies[i].render(renderer, time);}renderer.render(scene, camera);
}
const renderLoop = () => {render();requestAnimationFrame(renderLoop);
}
const on = () => {window.addEventListener('resize', debounce(resizeWindow), 1000);
}const init = () => {resizeWindow();on();renderer.setClearColor(0x1FFFF, 1.0);camera.position.set(250, 500, 1000);camera.lookAt(new THREE.Vector3());loader.crossOrigin = 'anonymous';  loader.load('http://ykob.github.io/sketch-threejs/img/sketch/butterfly/tex.png', (texture) => {texture.magFilter = THREE.NearestFilter;texture.minFilter = THREE.NearestFilter;for (var i = 0; i < BUTTERFLY_NUM; i++) {butterflies[i] = new Butterfly(i, texture);butterflies[i].obj.position.set(((i + 1) % 3 - 1) * i * 50, 0, 1800 / BUTTERFLY_NUM * i);scene.add(butterflies[i].obj);}renderLoop();});
}
init();new ConsoleSignature();

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蝴蝶飞舞（butterfly）

蝴蝶

示例

HTML

CSS

JS

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