A Pen By
Louis Hoebregts
Pro

` ````
<canvas></canvas>
```

` ````
body{
overflow: hidden;
margin:0;
}
canvas{
position: absolute;
top: 0;
left: 0;
width: 100%;
height:100%;
}
```

` ````
//Get window size
var ww = window.innerWidth,
wh = window.innerHeight;
//Create a WebGL renderer
var renderer = new THREE.WebGLRenderer({
canvas: document.querySelector("canvas")
});
renderer.setSize(ww, wh);
//Create an empty scene
var scene = new THREE.Scene();
scene.fog = new THREE.Fog(0x000000, 30, 150);
//Create a perpsective camera
var camera = new THREE.PerspectiveCamera(45, ww / wh, 0.1, 150);
camera.position.y = 400;
camera.position.z = 400;
//Array of points
var points = [
[68.5, 185.5],
[1, 262.5],
[270.9, 281.9],
[345.5, 212.8],
[178, 155.7],
[240.3, 72.3],
[153.4, 0.6],
[52.6, 53.3],
[68.5, 185.5]
];
//Convert the array of points into vertices
for (var i = 0; i < points.length; i++) {
var x = points[i][0];
var y = Math.random() * 100;
var z = points[i][1];
points[i] = new THREE.Vector3(x, y, z);
}
//Create a path from the points
var path = new THREE.CatmullRomCurve3(points);
path.closed = true;
// Define the precision of the finale tube, the amount of divisions
var tubeDetail = 1600;
// Define the precision of the circles
var circlesDetail = 40;
// Define the radius of the finale tube
var radius = 4;
// Get all the circles that will compose the tube
var frames = path.computeFrenetFrames(tubeDetail, true);
// Create an empty Geometry where we will put the particles
var geometry = new THREE.Geometry();
// Define a basic color
var color = new THREE.Color(0x000000);
// First loop through all the circles
for (var i = 0; i < tubeDetail; i++) {
// Get the normal values for each circle
var normal = frames.normals[i];
// Get the binormal values
var binormal = frames.binormals[i];
// Calculate the index of the circle (from 0 to 1)
var index = i / tubeDetail;
// Get the coordinates of the point in the center of the circle
var p = path.getPointAt(index);
// Loop for the amount of particles we want along each circle
for (var j = 0; j < circlesDetail; j++) {
// Clone the position of the point in the center
var position = p.clone();
// Calculate the angle for each particle along the circle (from 0 to Pi*2)
var angle = (j / circlesDetail) * Math.PI * 2 + (index * Math.PI * 5);
// Calculate the sine of the angle
var sin = Math.sin(angle);
// Calculate the cosine from the angle
var cos = -Math.cos(angle);
// Calculate the normal of each point based on its angle
var normalPoint = new THREE.Vector3(0, 0, 0);
normalPoint.x = (cos * normal.x + sin * binormal.x);
normalPoint.y = (cos * normal.y + sin * binormal.y);
normalPoint.z = (cos * normal.z + sin * binormal.z);
// Multiple the normal by the radius
normalPoint.multiplyScalar(radius);
// We add the normal values for each point
position.add(normalPoint);
var color = new THREE.Color("hsl(" + (index * 360 * 4) + ", 100%, 50%)");
geometry.colors.push(color);
geometry.vertices.push(position);
}
}
// Material for the points
var material = new THREE.PointsMaterial({
size: 0.2,
vertexColors: THREE.VertexColors
});
var tube = new THREE.Points(geometry, material);
//Add tube into the scene
scene.add(tube);
var percentage = 0;
function render() {
percentage += 0.0005;
var p1 = path.getPointAt(percentage % 1);
var p2 = path.getPointAt((percentage + 0.01) % 1);
camera.position.set(p1.x, p1.y, p1.z);
camera.lookAt(p2);
//Render the scene
renderer.render(scene, camera);
requestAnimationFrame(render);
}
requestAnimationFrame(render);
```

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