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HTML 

              
                <div class="container">
    <canvas id="canvas"></canvas>
</div>

<div class="links">
    <a href="https://tympanus.net/codrops/2023/01/25/crafting-a-dice-roller-with-three-js-and-cannon-es/" target="_blank">tutorial<img class="icon" src="https://ksenia-k.com/img/icons/link.svg"></a>
</div>
!

CSS 

              
                html, body {
    padding: 0;
    margin: 0;
}
.container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
}


.links {
    position: fixed;
    bottom: 20px;
    right: 20px;
    font-size: 18px;
    font-family: sans-serif;
}
a {
    text-decoration: none;
    color: black;
    margin-left: 1em;
}
a:hover {
    text-decoration: underline;
}
a img.icon {
    display: inline-block;
    height: 1em;
    margin: 0 0 -0.1em 0.3em;
}
!

JS 

              
                import * as THREE from 'https://cdn.skypack.dev/three@0.133.1/build/three.module';
import { OrbitControls } from 'https://cdn.skypack.dev/three@0.133.1/examples/jsm/controls/OrbitControls'
import * as BufferGeometryUtils from 'https://cdn.skypack.dev/three@0.133.1/examples/jsm/utils/BufferGeometryUtils.js';

import { GUI } from "https://cdn.skypack.dev/lil-gui@0.16.1";


const container = document.querySelector('.container');
const canvasEl = document.querySelector('#canvas');

let renderer, scene, camera, orbit, lightHolder, clock;
let boxMaterialOuter, boxMaterialOuterWireframe;

let diceMesh;

const params = {
    segments: 50,
    edgeRadius: .07,
    notchRadius: .12,
    notchDepth: .1,
    showOuterMesh: true,
    showInnerMesh: true,
    showOuterWireframe: false
}

initScene();
createControls();
window.addEventListener('resize', updateSceneSize);


function initScene() {

    renderer = new THREE.WebGLRenderer({
        alpha: true,
        antialias: true,
        canvas: canvasEl
    });
    renderer.shadowMap.enabled = true
    renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));

    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(45, container.clientWidth / container.clientHeight, .1, 100);
    camera.position.set(1, 1, 3);

    updateSceneSize();

    clock = new THREE.Clock()

    const ambientLight = new THREE.AmbientLight(0xffffff, .5);
    scene.add(ambientLight);
    lightHolder = new THREE.Group();
    const sideLight = new THREE.PointLight(0xffffff, .5);
    sideLight.position.set(5, 5, 5);
    lightHolder.add(sideLight);
    scene.add(lightHolder);

    orbit = new OrbitControls(camera, canvasEl);
    orbit.enableDamping = true;

    createDiceMesh();

    render();
}

function createDiceMesh() {
    boxMaterialOuterWireframe = new THREE.MeshNormalMaterial({
        wireframe: true
    })
    boxMaterialOuter = new THREE.MeshStandardMaterial({
        color: 0xeeeeee,
        visible: params.showOuterMesh,
    })
    const boxMaterialInner = new THREE.MeshStandardMaterial({
        color: 0x000000,
        roughness: 0,
        metalness: 1,
        visible: params.showInnerMesh,
        side: THREE.DoubleSide,
    })

    diceMesh = new THREE.Group();
    const innerMesh = new THREE.Mesh(createInnerGeometry(), boxMaterialInner);
    const outerMesh = new THREE.Mesh(createBoxGeometry(), params.showOuterWireframe ? boxMaterialOuterWireframe : boxMaterialOuter);
    diceMesh.add(innerMesh, outerMesh);
    scene.add(diceMesh)
}

function createBoxGeometry() {
    let boxGeometry = new THREE.BoxGeometry(1, 1, 1, params.segments, params.segments, params.segments);

    const positionAttr = boxGeometry.attributes.position;
    const subCubeHalfSize = .5 - params.edgeRadius;

    for (let i = 0; i < positionAttr.count; i++) {

        let position = new THREE.Vector3().fromBufferAttribute(positionAttr, i);

        const subCube = new THREE.Vector3(Math.sign(position.x), Math.sign(position.y), Math.sign(position.z)).multiplyScalar(subCubeHalfSize);
        const addition = new THREE.Vector3().subVectors(position, subCube);

        if (Math.abs(position.x) > subCubeHalfSize && Math.abs(position.y) > subCubeHalfSize && Math.abs(position.z) > subCubeHalfSize) {
            addition.normalize().multiplyScalar(params.edgeRadius);
            position = subCube.add(addition);
        } else if (Math.abs(position.x) > subCubeHalfSize && Math.abs(position.y) > subCubeHalfSize) {
            addition.z = 0;
            addition.normalize().multiplyScalar(params.edgeRadius);
            position.x = subCube.x + addition.x;
            position.y = subCube.y + addition.y;
        } else if (Math.abs(position.x) > subCubeHalfSize && Math.abs(position.z) > subCubeHalfSize) {
            addition.y = 0;
            addition.normalize().multiplyScalar(params.edgeRadius);
            position.x = subCube.x + addition.x;
            position.z = subCube.z + addition.z;
        } else if (Math.abs(position.y) > subCubeHalfSize && Math.abs(position.z) > subCubeHalfSize) {
            addition.x = 0;
            addition.normalize().multiplyScalar(params.edgeRadius);
            position.y = subCube.y + addition.y;
            position.z = subCube.z + addition.z;
        }

        const notchWave = (v) => {
            v = (1 / params.notchRadius) * v;
            v = Math.PI * Math.max(-1, Math.min(1, v));
            return params.notchDepth * (Math.cos(v) + 1.);
        }
        const notch = (pos) => notchWave(pos[0]) * notchWave(pos[1]);

        const offset = .23;

        if (position.y === .5) {
            position.y -= notch([position.x, position.z]);
        } else if (position.x === .5) {
            position.x -= notch([position.y + offset, position.z + offset]);
            position.x -= notch([position.y - offset, position.z - offset]);
        } else if (position.z === .5) {
            position.z -= notch([position.x - offset, position.y + offset]);
            position.z -= notch([position.x, position.y]);
            position.z -= notch([position.x + offset, position.y - offset]);
        } else if (position.z === -.5) {
            position.z += notch([position.x + offset, position.y + offset]);
            position.z += notch([position.x + offset, position.y - offset]);
            position.z += notch([position.x - offset, position.y + offset]);
            position.z += notch([position.x - offset, position.y - offset]);
        } else if (position.x === -.5) {
            position.x += notch([position.y + offset, position.z + offset]);
            position.x += notch([position.y + offset, position.z - offset]);
            position.x += notch([position.y, position.z]);
            position.x += notch([position.y - offset, position.z + offset]);
            position.x += notch([position.y - offset, position.z - offset]);
        } else if (position.y === -.5) {
            position.y += notch([position.x + offset, position.z + offset]);
            position.y += notch([position.x + offset, position.z]);
            position.y += notch([position.x + offset, position.z - offset]);
            position.y += notch([position.x - offset, position.z + offset]);
            position.y += notch([position.x - offset, position.z]);
            position.y += notch([position.x - offset, position.z - offset]);
        }

        positionAttr.setXYZ(i, position.x, position.y, position.z);
    }

    boxGeometry.deleteAttribute('normal');
    boxGeometry.deleteAttribute('uv');
    boxGeometry = BufferGeometryUtils.mergeVertices(boxGeometry);

    boxGeometry.computeVertexNormals();

    return boxGeometry;
}

function createInnerGeometry() {
    const baseGeometry = new THREE.PlaneGeometry(1 - 2 * params.edgeRadius, 1 - 2 * params.edgeRadius);
    const offset = .48;
    return BufferGeometryUtils.mergeBufferGeometries([
        baseGeometry.clone().translate(0, 0, offset),
        baseGeometry.clone().translate(0, 0, -offset),
        baseGeometry.clone().rotateX(.5 * Math.PI).translate(0, -offset, 0),
        baseGeometry.clone().rotateX(.5 * Math.PI).translate(0, offset, 0),
        baseGeometry.clone().rotateY(.5 * Math.PI).translate(-offset, 0, 0),
        baseGeometry.clone().rotateY(.5 * Math.PI).translate(offset, 0, 0),
    ], false);
}

function recreateGeometry() {
    diceMesh.children[0].geometry = createInnerGeometry();
    diceMesh.children[1].geometry = createBoxGeometry();
}

function render() {

    orbit.update();
    lightHolder.quaternion.copy(camera.quaternion);

    const elapsedTime = .4 * clock.getElapsedTime()
    diceMesh.rotation.x = 2.2 + elapsedTime;
    diceMesh.rotation.y = elapsedTime;

    renderer.render(scene, camera);
    requestAnimationFrame(render);
}

function updateSceneSize() {
    camera.aspect = container.clientWidth / container.clientHeight;
    camera.updateProjectionMatrix();
    renderer.setSize(container.clientWidth, container.clientHeight);
}

function createControls() {
    const gui = new GUI();
	 const appearance = gui.addFolder('APPEARANCE');
	 const internalParams = gui.addFolder('INTERNAL STRUCTURE');
    internalParams.add(params, 'showInnerMesh').onChange(v => {
        diceMesh.children[0].visible = v;
    });
    internalParams.add(params, 'showOuterWireframe').onChange(v => {
		  diceMesh.children[1].visible = true;
        diceMesh.children[1].material = v ? boxMaterialOuterWireframe : boxMaterialOuter;
    });
    internalParams.add(params, 'showOuterMesh').onChange(v => {
        diceMesh.children[1].visible = v;
    });
    appearance.add(params, 'edgeRadius', .01, .2).step(.01).onChange(recreateGeometry)
        .name('box edgeRadius');
    appearance.add(params, 'notchRadius', .01, .2).step(.01).onChange(recreateGeometry)
        .name('notches edgeRadius');
    appearance.add(params, 'notchDepth', .02, .2).step(.01).onChange(recreateGeometry)
        .name('notches depth');
    internalParams.add(params, 'segments', 2, 70).step(1).onChange(recreateGeometry)
        .name('outer mesh segments');
}
!
999px

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