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HTML 

              
                <a href='//twitter.com/ycwhk' target='_blank'>couple</a>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Nova+Mono&display=swap');

canvas {
    display: grid; width: 100%; height: 100vh;
    position: fixed; top: 0; left: 0;
    cursor: grab;
}

a {
    display: block;
    color: black;
    padding: 5vmin;
    width: min-content;
    font-family: 'nova mono', monospace;
    position: relative; z-index: 1;
}

a:hover:after {
    display: block;
    content: "#2374C6, #C20F00, #FFDD22, #FFFFFF, #000000."
}

body {
    display: block;
    height: 100vh;
}
!

JS 

              
                import * as $ from '//unpkg.com/three@0.118.3/build/three.module.js'
import { OrbitControls } from '//unpkg.com/three@0.118.3/examples/jsm/controls/OrbitControls.js'
import { EffectComposer } from '//unpkg.com/three@0.118.3/examples/jsm/postprocessing/EffectComposer'
import { RenderPass } from '//unpkg.com/three@0.118.3/examples/jsm/postprocessing/RenderPass'
import { UnrealBloomPass } from '//unpkg.com/three@0.118.3/examples/jsm/postprocessing/UnrealBloomPass'

// ----
// Boot
// ----


const renderer = new $.WebGLRenderer({ antialias: true });
const scene = new $.Scene();
const camera = new $.PerspectiveCamera(75, 2, 0.1, 100);
const controls = new OrbitControls(camera, renderer.domElement);
const composer = new EffectComposer(renderer);
const res = new $.Vector2();
window.addEventListener('resize', () => {
    const { clientWidth, clientHeight } = renderer.domElement;
    renderer.setPixelRatio(window.devicePixelRatio);
    renderer.setSize(clientWidth, clientHeight, false);
    camera.aspect = clientWidth / clientHeight;
    camera.updateProjectionMatrix();
    composer.setPixelRatio(window.devicePixelRatio);
    composer.setSize(clientWidth, clientHeight);
    renderer.getDrawingBufferSize(res);
});
document.body.prepend(renderer.domElement);
window.dispatchEvent(new Event('resize'));
renderer.setAnimationLoop(t => {
    composer.render();
    controls.update();
});

// ----
// Main
// ---- 

const BLUEISH = '#2374C6';
const REDISH = '#C20F00';
const YELLOWISH = '#FFDD22';
const BLACK = '#000000';
const WHITE = '#FFFFFF';

scene.background = new $.Color(WHITE);
camera.position.set(5, 7, 5);
controls.autoRotate = true;
renderer.shadowMap.enabled = true;

const light = new $.DirectionalLight(WHITE, 1.2);
light.position.set(0, 5, 0);
light.castShadow = true;
light.shadow.camera.near = 1;
light.shadow.camera.far = 10;
light.shadow.camera.left = -10;
light.shadow.camera.right = 10;
light.shadow.camera.top = 10;
light.shadow.camera.bottom = -10;
light.shadow.bias = -0.01;
scene.add(light);

//// Generalize https://codepen.io/ycw/pen/ExKyJdR?editors=0010 `class Box`

class F {
    constructor({ mat, size }) {
        this.size = size;
        this.mat = mat;
        const { pivot, object } = this.buildMesh();
        this.object = object;
        this.pivot = pivot;
    }
    buildPivot(w, h, d, tx, ty, tz, px, py, pz) {
        const geom = new $.BoxBufferGeometry(w, h, d);
        geom.translate(tx, ty, tz);
        const pivot = new $.Mesh(geom, this.mat);
        pivot.position.set(px, py, pz);
        pivot.castShadow = true;
        pivot.receiveShadow = true;
        return pivot;
    }
    buildMesh() { // t-pose on xz heading to z-
        const SZ = this.size;
        const S = SZ / 2; // box half size
        const T = SZ / 50; // thickness
        const pivot = {};
        pivot.right = this.buildPivot(SZ * 2, T, SZ, SZ, 0, 0, S, 0, 0);
        pivot.left = this.buildPivot(SZ * 2, T, SZ, -SZ, 0, 0, -S, 0, 0);
        pivot.body = this.buildPivot(SZ, T, SZ, 0, 0, 0, 0, 0, 0);
        pivot.head = this.buildPivot(SZ, T, SZ, 0, 0, -S, 0, 0, -S);
        pivot.head.rotation.x = Math.PI / 20;
        pivot.uppertail = this.buildPivot(SZ, T, SZ, 0, 0, S, 0, 0, S);
        pivot.lowertail = this.buildPivot(SZ, T, SZ, 0, 0, S, 0, 0, SZ);
        const object = new $.Group();
        object.add(pivot.right);
        object.add(pivot.left);
        object.add(pivot.body);
        object.add(pivot.head);
        object.add(pivot.uppertail);
        pivot.uppertail.add(pivot.lowertail);
        return { pivot, object };
    }
    animate_wing(duration) {
        return new Promise((onComplete) => {
            const defaults = {
                ease: 'power3',
                duration: duration / 3
            };
            const k = Math.PI / 6;
            const n_flutter = 2;
            const t_down = duration * 0.2 / n_flutter;
            const t_up = duration * 0.2 / n_flutter;
            const t_soar = duration - t_down - t_up;
            const tl_flutter = gsap.timeline({ defaults, repeat: n_flutter })
                .addLabel('DOWN')
                .to(this.pivot.right.rotation, { z: -k, duration: t_down }, 'DOWN')
                .to(this.pivot.left.rotation, { z: k, duration: t_down }, 'DOWN')
                .addLabel('UP')
                .to(this.pivot.right.rotation, { z: k, duration: t_up }, 'UP')
                .to(this.pivot.left.rotation, { z: -k, duration: t_up }, 'UP');
            const tl_soar = gsap.timeline({ defaults, pasused: true })
                .addLabel('SOAR')
                .to(this.pivot.right.rotation, { z: 0, duration: t_soar }, 'SOAR')
                .to(this.pivot.left.rotation, { z: 0, duration: t_soar }, 'SOAR');
            gsap.timeline({ onComplete, repeat: -1 })
                .add(tl_flutter)
                .add(tl_soar);
        });
    }
    animate_tail(duration) {
        return new Promise((onComplete) => {
            const defaults = {
                ease: 'power3.out',
                duration: duration / 4
            };
            const k = Math.PI / 100;
            gsap.timeline({ onComplete, defaults, repeat: -1 })
                .addLabel('UP')
                .to(this.pivot.uppertail.rotation, { x: -k }, 'UP')
                .to(this.pivot.lowertail.rotation, { x: k * 2 }, 'UP')
                .addLabel('DOWN')
                .to(this.pivot.uppertail.rotation, { x: k }, 'DOWN')
                .to(this.pivot.lowertail.rotation, { x: -k * 2 }, 'DOWN')
        });
    }
    animate(duration) {
        return Promise.all([
            this.animate_wing(duration),
            this.animate_tail(duration)
        ]);
    }
}

//// Make F

{
    const size = 1;
    const colors = [REDISH, YELLOWISH];

    for (let i = 0, I = 2; i < I; ++i) {
        const color = colors[i % colors.length];
        const mat = new $.MeshLambertMaterial({ color });
        const f = new F({ mat, size });
        f.animate(2);
        const fly_pivot = new $.Group();
        fly_pivot.position.x = (i * size * 4);
        fly_pivot.position.z = (i * size * 4);
        fly_pivot.position.y = 5 + size;
        fly_pivot.add(f.object);
        scene.add(fly_pivot);
        f.object.position.y = size - fly_pivot.position.y;
        const duration = i / I * 2 + 1;
        const ease = 'power3';
        gsap.timeline({ repeat: -1, defaults: { ease, duration } })
            .set(fly_pivot.rotation, { z: Math.PI / -5 })
            .to(fly_pivot.rotation, { z: Math.PI / 5 })
            .to(fly_pivot.rotation, { z: Math.PI / -5 });
    }
}

//// Ground

{
    const geom = new $.BoxBufferGeometry(1000, 0.01, 1000, 100, 1, 100);
    const mat = new $.MeshLambertMaterial({ color: BLUEISH })
    const mesh = new $.Mesh(geom, mat);
    mesh.receiveShadow = true;
    scene.add(mesh);
}

//// Animate - repeating background

{
    const bg = new $.Group();
    for (let i = 0, I = 64; i < I; ++i) {
        const h = Math.random();
        const r = 1 + Math.random() * 4;
        const geom = new $.ConeBufferGeometry(r, h);
        const mat = new $.MeshLambertMaterial({ color: BLUEISH });
        const mesh = new $.Mesh(geom, mat);
        mesh.receiveShadow = true;
        bg.add(mesh);
        reset(mesh);
    }
    scene.add(bg);
    function reset(mesh) {
        const z = -50 - Math.random() * 100;
        mesh.position.z = z;
        mesh.position.x = Math.random() * 100 - 50;
        const duration = Math.abs(z) / 20;
        const ease = 'linear';
        const onComplete = () => reset(mesh);
        gsap.to(mesh.position, { z: Math.abs(z), duration, onComplete, ease });
    }
}

//// PostProcessing

const renderPass = new RenderPass(scene, camera);
const bloomPass = new UnrealBloomPass(res, .4, 1, 0.8);
composer.addPass(renderPass);
composer.addPass(bloomPass);
!
999px

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