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              html, body, canvas
    margin 0
    padding 0
    width 100vw
    height 100vh
    overflow hidden
    background #1B2B34
    background radial-gradient(ellipse at center, #001B36 0%, #000 100%)
    position absolute
    top 0
    left 0

div
    z-index 100
    
div:last-child
    top 48px !important
        
canvas
    z-index 10
            
          
!
            
              imageSrc = 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`

let renderer
    , controls
    , scene
    , camera
let w, h
    , statsFps
    , statsMs
    , radius = .2
    , material
    , uniforms

resize()
init()
animate()

function rand(min, max) {
    return Math.random() * (max - min) + min
}

function resize() {
    w = document.body.clientWidth
    h = document.body.clientHeight
    if (!camera) {
        return
    }
    
    uniforms.scale.value = h * .5
    camera.aspect = w / h
    camera.updateProjectionMatrix()
    renderer.setSize(w, h)
}

function init() {
    
    scene = new THREE.Scene()

    camera = new THREE.PerspectiveCamera(75, w / h, 1, 6000)
    camera.position.z = 25
    
    renderer = new THREE.WebGLRenderer({alpha: true})
    renderer.setSize(w, h)
    renderer.setClearColor("#0C7CA5", 0)
    renderer.setPixelRatio(window.devicePixelRatio)
    renderer.sortObjects = false
    renderer.autoClear = false
    renderer.generateMipmaps = false
    
    let light = new THREE.HemisphereLight('#fff', '#eee', 50)
    light.position.set(0, 0, 300)
    light.castShadow = true
    scene.add(light)

    light = new THREE.PointLight(0x222222, 3)
    light.position.x = 1000
    light.position.y = 500
    light.position.z = 1000
    light.castShadow = true
    scene.add(light)
    
    const pointsGeometry = makeLine()
    
    material = new THREE.PointsMaterial({
        size: radius,
        // color: 0xff00ff,
        map:  new THREE.TextureLoader().load(imageSrc),
        blending: THREE.AdditiveBlending,
        depthWrite: false,
        transparent: true
    })
    
    const shaderPoint = THREE.ShaderLib.points
    uniforms = THREE.UniformsUtils.clone(shaderPoint.uniforms)

    const image = new Image()
    uniforms.map.value = new THREE.Texture(image)
    image.onload = function() {
        uniforms.map.value.needsUpdate = true
    };
    image.src = imageSrc
    uniforms.size.value = radius
    uniforms.scale.value = h * .5
    
    material = new THREE.ShaderMaterial({
        uniforms: uniforms,
        defines: {
            USE_MAP: "",
            USE_SIZEATTENUATION: ""
        },
        transparent: true,
        // alphaTest: .4,
        depthWrite: false,
        // depthTest: false,
        blending: THREE.AdditiveBlending,        
        vertexShader: shaderPoint.vertexShader,
        fragmentShader: shaderPoint.fragmentShader
    })
    
    const points = new THREE.Points(pointsGeometry, material)
    scene.add(points)
    
    camera.lookAt(scene.position)
    
    controls = new THREE.OrbitControls(camera, renderer.domElement);
    
    document.body.appendChild(renderer.domElement)
        
    statsFps = new Stats()
    document.body.appendChild(statsFps.dom)
    
    statsMs = new Stats()
    statsMs.showPanel(1)
    document.body.appendChild(statsMs.dom)
    
    window.addEventListener('resize', resize, false)
    
    renderer.domElement.addEventListener('dblclick', () => {
        material.size = rand(.1, 1)
        material.needsUpdate = true
    }, false)
    
}

let t = 0
function animate() {
    
    requestAnimationFrame(animate)
    
    renderer.clear()
    renderer.render(scene, camera)
    

    // if (!(t++ % 500)) {
    //     material.size = rand(.1, 1)
    //     material.needsUpdate = true
    // }
    
    controls.update()
    statsFps.update()
    statsMs.update()
    
}

function getPoints(start, end, size) {
    const vec3 = start.clone()
    const res = []
    for(let i = 0; i < size; i++) {
        vec3.set(start.x, start.y, start.z)
        vec3.lerp(end, i/size)
        res.push(vec3.x, vec3.y, vec3.z)
    }
    return res
}

function getPositions(points, count, alpha) {
    let positions = []
    if (!points)
        return positions
    
    let l = count
    let index = 0
    const vec3s = new THREE.Vector3()
    const vec3e = vec3s.clone()
    const vec3n = vec3s.clone()
    let dist, size, i, items
    while(l--) {
        vec3s.set(points.getX(l), points.getY(l), points.getZ(l))
        vec3n.set(vec3s.x, vec3s.y, vec3s.z)
        if (l < 1) {
            positions.push(vec3n.x, vec3n.y, vec3n.z)
            break;
        }
        vec3e.set(points.getX(l - 1), points.getY(l - 1), points.getZ(l - 1));

        dist = vec3n.distanceTo(vec3e);
        size = dist * alpha | 0
        
        items = getPoints(vec3s, vec3e)
        
        positions.push.apply(positions, items)
    }
    
    return positions
}

function sortFunction(a, b) {
    return a - b;
}

function genWireframe(geometry, alpha) {
    var vertices = geometry.vertices;
    var faces = geometry.faces;
    var numEdges = 0;
    var l, i, j;

    var edge = [0, 0], hash = {};
    var keys = [ 'a', 'b', 'c' ];

    // allocate maximal size
    var edges = new Uint32Array(6 * faces.length);

    for (i = 0, l = faces.length; i < l; i++) {

        var face = faces[i];

        for (j = 0; j < 3; j++) {

            edge[0] = face[keys[j]];
            edge[1] = face[keys[( j + 1 ) % 3]];
            edge.sort(sortFunction);

            var key = edge.toString();

            if (hash[key] === undefined) {

                edges[2 * numEdges] = edge[0];
                edges[2 * numEdges + 1] = edge[1];
                hash[key] = true;
                numEdges++;

            }
        }
    }

    const coords = []
    let vec3s
        , vec3e
        , dist
        , items
        , size
        ;

    for (i = 0, l = numEdges; i < l; i++) {
        vec3s = vertices[edges [2 * i]]
        vec3e = vertices[edges [2 * i + 1]]
        
        dist = vec3s.distanceTo(vec3e)
        size = dist * alpha | 0

        items = getPoints(vec3s, vec3e, size)

        coords.push.apply(coords, items);
    }

    return coords;
}

function makeLine() {
    
    let geometry = new THREE.IcosahedronGeometry(20, 4)    
        
    const pos = genWireframe(geometry, 10/radius)
    
    geometry = new THREE.BufferGeometry()
    geometry.addAttribute("position", new THREE.BufferAttribute(new Float32Array(pos), 3))
    return geometry
}
            
          
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