An attempt to show how to put points in formations, animate and color them. Also, to show how to use rotation.order to incline a rotating object.
Created
January 11, 2023 03:56
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Nova - Points (color, animation, rotation.order)
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<div id="word">Nova</div> |
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import * as THREE from "https://cdn.skypack.dev/three@0.136.0"; | |
import {OrbitControls} from "https://cdn.skypack.dev/three@0.136.0/examples/jsm/controls/OrbitControls"; | |
console.clear(); | |
let scene = new THREE.Scene(); | |
scene.background = new THREE.Color(0x160016); | |
let camera = new THREE.PerspectiveCamera(60, innerWidth / innerHeight, 1, 1000); | |
camera.position.set(0, 4, 21); | |
let renderer = new THREE.WebGLRenderer(); | |
renderer.setSize(innerWidth, innerHeight); | |
document.body.appendChild(renderer.domElement); | |
window.addEventListener("resize", event => { | |
camera.aspect = innerWidth / innerHeight; | |
camera.updateProjectionMatrix(); | |
renderer.setSize(innerWidth, innerHeight); | |
}) | |
let controls = new OrbitControls(camera, renderer.domElement); | |
controls.enableDamping = true; | |
controls.enablePan = false; | |
let gu = { | |
time: {value: 0} | |
} | |
let sizes = []; | |
let shift = []; | |
let pushShift = () => { | |
shift.push( | |
Math.random() * Math.PI, | |
Math.random() * Math.PI * 2, | |
(Math.random() * 0.9 + 0.1) * Math.PI * 0.1, | |
Math.random() * 0.9 + 0.1 | |
); | |
} | |
let pts = new Array(50000).fill().map(p => { | |
sizes.push(Math.random() * 1.5 + 0.5); | |
pushShift(); | |
return new THREE.Vector3().randomDirection().multiplyScalar(Math.random() * 0.5 + 9.5); | |
}) | |
for(let i = 0; i < 100000; i++){ | |
let r = 10, R = 40; | |
let rand = Math.pow(Math.random(), 1.5); | |
let radius = Math.sqrt(R * R * rand + (1 - rand) * r * r); | |
pts.push(new THREE.Vector3().setFromCylindricalCoords(radius, Math.random() * 2 * Math.PI, (Math.random() - 0.5) * 2 )); | |
sizes.push(Math.random() * 1.5 + 0.5); | |
pushShift(); | |
} | |
let g = new THREE.BufferGeometry().setFromPoints(pts); | |
g.setAttribute("sizes", new THREE.Float32BufferAttribute(sizes, 1)); | |
g.setAttribute("shift", new THREE.Float32BufferAttribute(shift, 4)); | |
let m = new THREE.PointsMaterial({ | |
size: 0.125, | |
transparent: true, | |
depthTest: false, | |
blending: THREE.AdditiveBlending, | |
onBeforeCompile: shader => { | |
shader.uniforms.time = gu.time; | |
shader.vertexShader = ` | |
uniform float time; | |
attribute float sizes; | |
attribute vec4 shift; | |
varying vec3 vColor; | |
${shader.vertexShader} | |
`.replace( | |
`gl_PointSize = size;`, | |
`gl_PointSize = size * sizes;` | |
).replace( | |
`#include <color_vertex>`, | |
`#include <color_vertex> | |
float d = length(abs(position) / vec3(40., 10., 40)); | |
d = clamp(d, 0., 1.); | |
vColor = mix(vec3(227., 155., 0.), vec3(100., 50., 255.), d) / 255.; | |
` | |
).replace( | |
`#include <begin_vertex>`, | |
`#include <begin_vertex> | |
float t = time; | |
float moveT = mod(shift.x + shift.z * t, PI2); | |
float moveS = mod(shift.y + shift.z * t, PI2); | |
transformed += vec3(cos(moveS) * sin(moveT), cos(moveT), sin(moveS) * sin(moveT)) * shift.w; | |
` | |
); | |
//console.log(shader.vertexShader); | |
shader.fragmentShader = ` | |
varying vec3 vColor; | |
${shader.fragmentShader} | |
`.replace( | |
`#include <clipping_planes_fragment>`, | |
`#include <clipping_planes_fragment> | |
float d = length(gl_PointCoord.xy - 0.5); | |
//if (d > 0.5) discard; | |
` | |
).replace( | |
`vec4 diffuseColor = vec4( diffuse, opacity );`, | |
`vec4 diffuseColor = vec4( vColor, smoothstep(0.5, 0.1, d)/* * 0.5 + 0.5*/ );` | |
); | |
//console.log(shader.fragmentShader); | |
} | |
}); | |
let p = new THREE.Points(g, m); | |
p.rotation.order = "ZYX"; | |
p.rotation.z = 0.2; | |
scene.add(p) | |
let clock = new THREE.Clock(); | |
renderer.setAnimationLoop(() => { | |
controls.update(); | |
let t = clock.getElapsedTime() * 0.5; | |
gu.time.value = t * Math.PI; | |
p.rotation.y = t * 0.05; | |
renderer.render(scene, camera); | |
}); |
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@import "https://fonts.googleapis.com/css2?family=Megrim&display=swap"; | |
body{ | |
overflow: hidden; | |
margin: 0; | |
} | |
#word{ | |
font-family: Megrim, cursive; | |
font-size: 20vh; | |
position: absolute; | |
margin: 10; | |
/*bottom: 0;*/ | |
color: #fc0; | |
-webkit-text-stroke: 0.15vh #c0f; | |
} |
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