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211 lines
5.5 KiB
211 lines
5.5 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - node particles</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl node particles example
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/",
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"three/nodes": "./jsm/nodes/Nodes.js"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import * as Nodes from 'three/nodes';
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import Stats from 'three/addons/libs/stats.module.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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import { TeapotGeometry } from 'three/addons/geometries/TeapotGeometry.js';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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import { nodeFrame } from 'three/addons/renderers/webgl/nodes/WebGLNodes.js';
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let camera, scene, renderer, stats;
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 55, window.innerWidth / window.innerHeight, 2, 2000 );
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camera.position.x = 0;
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camera.position.y = 100;
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camera.position.z = - 300;
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scene = new THREE.Scene();
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scene.fog = new THREE.FogExp2( 0x000000, 0.001 );
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// geometries
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const teapotGeometry = new TeapotGeometry( 50, 7 );
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const sphereGeometry = new THREE.SphereGeometry( 50, 130, 16 );
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const geometry = new THREE.BufferGeometry();
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// buffers
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const speed = [];
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const intensity = [];
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const size = [];
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const positionAttribute = teapotGeometry.getAttribute( 'position' );
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const particleCount = positionAttribute.count;
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for ( let i = 0; i < particleCount; i ++ ) {
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speed.push( 20 + Math.random() * 50 );
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intensity.push( Math.random() * .15 );
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size.push( 30 + Math.random() * 230 );
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}
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geometry.setAttribute( 'position', positionAttribute );
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geometry.setAttribute( 'targetPosition', sphereGeometry.getAttribute( 'position' ) );
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geometry.setAttribute( 'particleSpeed', new THREE.Float32BufferAttribute( speed, 1 ) );
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geometry.setAttribute( 'particleIntensity', new THREE.Float32BufferAttribute( intensity, 1 ) );
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geometry.setAttribute( 'particleSize', new THREE.Float32BufferAttribute( size, 1 ) );
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// maps
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// Forked from: https://answers.unrealengine.com/questions/143267/emergency-need-help-with-fire-fx-weird-loop.html
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const fireMap = new THREE.TextureLoader().load( 'textures/sprites/firetorch_1.jpg' );
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// nodes
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const targetPosition = new Nodes.AttributeNode( 'targetPosition', 'vec3' );
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const particleSpeed = new Nodes.AttributeNode( 'particleSpeed', 'float' );
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const particleIntensity = new Nodes.AttributeNode( 'particleIntensity', 'float' );
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const particleSize = new Nodes.AttributeNode( 'particleSize', 'float' );
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const time = new Nodes.TimerNode();
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const spriteSheetCount = new Nodes.ConstNode( new THREE.Vector2( 6, 6 ) );
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const fireUV = new Nodes.SpriteSheetUVNode(
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spriteSheetCount, // count
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new Nodes.PointUVNode(), // uv
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new Nodes.OperatorNode( '*', time, particleSpeed ) // current frame
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);
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const fireSprite = new Nodes.TextureNode( fireMap, fireUV );
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const fire = new Nodes.OperatorNode( '*', fireSprite, particleIntensity );
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const lerpPosition = new Nodes.UniformNode( 0 );
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const positionNode = new Nodes.MathNode( Nodes.MathNode.MIX, new Nodes.PositionNode( Nodes.PositionNode.LOCAL ), targetPosition, lerpPosition );
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// material
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const material = new Nodes.PointsNodeMaterial( {
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depthWrite: false,
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transparent: true,
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sizeAttenuation: true,
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blending: THREE.AdditiveBlending
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} );
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material.colorNode = fire;
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material.sizeNode = particleSize;
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material.positionNode = positionNode;
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const particles = new THREE.Points( geometry, material );
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scene.add( particles );
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// renderer
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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// stats
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stats = new Stats();
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document.body.appendChild( stats.dom );
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// gui
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const gui = new GUI();
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const guiNode = { lerpPosition: 0 };
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gui.add( material, 'sizeAttenuation' ).onChange( function () {
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material.needsUpdate = true;
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} );
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gui.add( guiNode, 'lerpPosition', 0, 1 ).onChange( function () {
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lerpPosition.value = guiNode.lerpPosition;
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} );
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gui.open();
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// controls
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const controls = new OrbitControls( camera, renderer.domElement );
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controls.maxDistance = 1000;
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controls.update();
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// events
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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nodeFrame.update();
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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