XProfan

// non indexed BufferGeometry

function RoundEdgedBoxFlat( w, h, t, r, s ) {// width, height, thick, radius corner, smoothness

    // helper const's and let's
    const wi = w / 2 - r;// inner width, half
    const hi = h / 2 - r;// inner height, half
    const w2 = w / 2;// half width
    const h2 = h / 2;// half height
    let ul = r / w;// u left front side
    let ur = ( w - r ) / w;// u right front side
    const vl = r / h;// v low
    const vh = ( h - r ) / h;// v high
    let phia, phib, xc, yc, uc, vc, cosa, sina, cosb, sinb;
    let positions = [];
    let uvs = [];
    // for front side
    let t2 = t / 2;// +  half thick
    let u0 = ul;
    let u1 = ur;
    let u2 = 0;
    let u3 = 1;
    let sign = 1;

    for( let k = 0; k < 2; k ++ ) {// front and back side

        positions.push(
        -wi, -h2, t2,  wi, -h2, t2,  wi, h2, t2,
        -wi, -h2, t2,  wi,  h2, t2, -wi, h2, t2,
        -w2, -hi, t2, -wi, -hi, t2, -wi, hi, t2,
        -w2, -hi, t2, -wi,  hi, t2, -w2, hi, t2,
        wi, -hi, t2,  w2, -hi, t2,  w2, hi, t2,
        wi, -hi, t2,  w2,  hi, t2,  wi, hi, t2
        );
        uvs.push(
        u0,  0, u1,  0, u1,  1,
        u0,  0, u1,  1, u0,  1,
        u2, vl, u0, vl, u0, vh,
        u2, vl, u0, vh, u2, vh,
        u1, vl, u3, vl, u3, vh,
        u1, vl, u3, vh,	u1, vh
        );
        phia = 0;

        for ( let i = 0; i < s * 4; i ++ ) {

            phib = Math.PI * 2 * ( i + 1 ) / ( 4 * s );
            cosa = Math.cos( phia );
            sina = Math.sin( phia );
            cosb = Math.cos( phib );
            sinb = Math.sin( phib );
            xc = i < s || i >= 3 * s ? wi : -wi;
            yc = i < 2 * s ? hi : -hi;
            positions.push( xc, yc, t2,  xc + r * cosa, yc + r * sina, t2,  xc + r * cosb, yc + r * sinb, t2 );
            uc = i < s || i >= 3 * s ? u1 : u0;
            vc = i < 2 * s ? vh : vl;
            uvs.push( uc, vc, uc + sign * ul * cosa, vc + vl * sina, uc + sign * ul * cosb, vc + vl * sinb );
            phia = phib;

        }

        // for back side
        t2 = -t2;// - half thick
        u0 = ur;// right left exchange
        u1 = ul;
        u2 = 1;
        u3 = 0;
        sign = -1;

    }

    // framing
    t2 = t / 2;// + half thick (again)
    positions.push(
    -wi, -h2,  t2, -wi, -h2, -t2,  wi, -h2, -t2,
    -wi, -h2,  t2,  wi, -h2, -t2,  wi, -h2,  t2,
    w2, -hi,  t2,  w2, -hi, -t2,  w2,  hi, -t2,
    w2, -hi,  t2,  w2,  hi, -t2,  w2,  hi,  t2,
    wi,  h2,  t2,  wi,  h2, -t2, -wi,  h2, -t2,
    wi,  h2,  t2, -wi,  h2, -t2, -wi,  h2,  t2,
    -w2,  hi,  t2, -w2,  hi, -t2, -w2, -hi, -t2,
    -w2,  hi,  t2, -w2, -hi, -t2, -w2, -hi,  t2
    );
    const cf = 2 * ( ( w + h - 4 * r ) + Math.PI * r );// circumference
    const cc4 = Math.PI * r / 2 / cf// circle-circumference / 4 / circumference
    u0 = 0;
    u1 = 2 * wi / cf;
    u2 = u1 + cc4;
    u3 = u2 + 2 * hi / cf;
    const u4 = u3 + cc4;
    const u5 = u4 + 2 * wi / cf;
    const u6 = u5 + cc4;
    const u7 = u6 + 2 * hi / cf;
    uvs.push(
    u0, 1,  0, 0, u1, 0,
    u0, 1, u1, 0, u1, 1,
    u2, 1, u2, 0, u3, 0,
    u2, 1, u3, 0, u3, 1,
    u4, 1, u4, 0, u5, 0,
    u4, 1, u5, 0, u5, 1,
    u6, 1, u6, 0, u7, 0,
    u6, 1, u7, 0, u7, 1
    );
    phia = 0;
    let u, j, j1;
    const ccs = cc4 / s;// partial value according to smoothness

    for ( let i = 0; i < s * 4; i ++ ) {

        phib = Math.PI * 2 * ( i + 1 ) / ( 4 * s );
        cosa = Math.cos( phia );
        sina = Math.sin( phia );
        cosb = Math.cos( phib );
        sinb = Math.sin( phib );
        xc = i < s || i >= 3 * s ? wi : -wi;
        yc = i < 2 * s ? hi : -hi;
        positions.push( xc + r * cosa, yc + r * sina, t2,  xc + r * cosa, yc + r * sina, -t2,  xc + r * cosb, yc + r * sinb, -t2 );
        positions.push( xc + r * cosa, yc + r * sina, t2,  xc + r * cosb, yc + r * sinb, -t2,  xc + r * cosb, yc + r * sinb,  t2 );
        u = i < s ? u3 : ( i < 2 * s ? u5 : ( i < 3 * s ? u7 : u1 ) );// Attention! different start to front/back
        j = i % s;
        j1 = j + 1;
        uvs.push( u + j * ccs, 1,  u + j  * ccs, 0,  u + j1 * ccs, 0 );
        uvs.push( u + j * ccs, 1,  u + j1 * ccs, 0,  u + j1 * ccs, 1 );
        phia = phib;

    }

    const geometry = new THREE.BufferGeometry( );
    geometry.setAttribute('position', new THREE.BufferAttribute( new Float32Array( positions ), 3 ) );
    geometry.setAttribute('uv', new THREE.BufferAttribute( new Float32Array( uvs ), 2 ) );
    // add multimaterial groups for front, back, framing
    const vtc = ( 6 + 4 * s ) * 3;// vertex count one side
    geometry.addGroup ( 0, vtc , 0 );
    geometry.addGroup ( vtc, vtc , 1 );
    geometry.addGroup ( 2 * vtc, 24 +  2 * 3  *  4 * s, 2 );
    volver geometry;

}

<!DOCTYPE html>
<!-- https://discourse.threejs.org/t/create-circle-with-fuzzy-edge-made-of-individual-random-particles/30150/6 -->
<!-- see also
https://discourse.threejs.org/t/how-move-all-points-to-sphere/1836/2
and
https://codepen.io/looeee/pen/LQLQRd
-->
<head>
<title> PointsToCircleRandomMultiple </title>
<meta charset="utf-8" />
<style>

body {

    margin: 0;
    overflow: hidden;

}

</style>
</head>
<body> </body>
<script type="module">
// @author  looeee - strongly changed by hofk
import * as THREE from "../jsm/three.module.132.js";
import { OrbitControls } from "../jsm/OrbitControls.132.js";
let camera, renderer, scene;
const v = new THREE.Vector2();
let r;
let positions = [];
const distributionA = n => Math.pow( n, 1 / 4 );
const distributionB = n => 0.2 * Math.pow( n, 1 / 2 );
const distributionC = n => 0.6 * Math.pow( Math.random( ), 2 );
window.addEventListener('resize', onWindowResize );
init();
randomPoints();
animate();

function onWindowResize() {

    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize( window.innerWidth, window.innerHeight );

}

function init() {

    renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight );
    renderer.setPixelRatio( window.devicePixelRatio );
    document.body.appendChild( renderer.domElement );
    scene = new THREE.Scene();
    camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 1000 );
    camera.position.set( 2, -3, 4 );
    const controls = new OrbitControls( camera, renderer.domElement );

}

function randomPoints() {

    //      count, rMin, distribution
    pushpos( 1200, -0.1, distributionA );
    pushpos( 2000,  0.8, distributionB );
    pushpos(  300, 1.05, distributionC );
    const geometry = new THREE.BufferGeometry( );
    geometry.setAttribute('position', new THREE.Float32BufferAttribute( positions, 3 ) );
    const material = new THREE.PointsMaterial( { color: 0xffff34, size: 0.001 } );
    const particles = new THREE.Points(geometry, material);
    scene.add( particles );

}

function animate() {

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

}

// .......................

function pushpos( count, rMin, distribution ) {

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

        const phi = Math.random( ) * Math.PI * 2;
        const rnd = Math.random( )
        r = rMin + distribution( rnd );
        v.x = r * Math.cos( phi );
        v.y = r * Math.sin( phi );
        positions.push( v.x, v.y, 0 );

    }

}

</script>
</html>