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POAccessing single particles in THREE.js Particle System
 

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  1. POAccessing single particles in THREE.js Particle System
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    <p>I really tried every example, searched the web for hours but I can't seem to get it working!</p> <p>So I simply tried to implement a little particle system simulating falling snow, just like this: <a href="http://www.aerotwist.com/tutorials/creating-particles-with-three-js/" rel="nofollow">http://www.aerotwist.com/tutorials/creating-particles-with-three-js/</a></p> <p>But I only can access it in whole. Meaning I can rotate it as such but as soon as I try to iterate over it's vertices, the whole animation is getting the hiccups! I would really appreciate some help here!</p> <p>-</p> <p>Here are the key parts:</p> <p>-> Setting up the particle system:</p> <pre><code>var partikelGeo = new THREE.Geometry(); var partikelMaterial = new THREE.ParticleBasicMaterial({ color:0xffffff, size: 10, map: THREE.ImageUtils.loadTexture('snowflake2.png'), blending: THREE.AdditiveBlending, transparent:true }); var partikelAnzahl = 3500; for (var p = 0; p &lt; partikelAnzahl; p++) { var pX = Math.random() * 1000 -500; var pY = Math.random() * 1000 -500; var pZ = Math.random() * 1000 -500; var partikel = new THREE.Vertex(new THREE.Vector3(pX,pY,pZ)); partikel.velocity = new THREE.Vector3(0,-Math.random(),0); partikelGeo.vertices.push(partikel); } var partikelSystem = new THREE.ParticleSystem(partikelGeo, partikelMaterial); partikelSystem.sortParticles = true; scene.add(partikelSystem); </code></pre> <p>-> Rendering &amp; Animation on mouseclick</p> <pre><code>var frame = 0; function animate(){ // request new frame requestAnimationFrame(function(){ animate(); }); // render render(); } animate(); var check = 0; onmousedown = function(){ if (check) { check = 0; }else{ check = 1; } } function render() { if (check) { clickDo(); } camera.lookAt(new THREE.Vector3(0,0,0)); renderer.render(scene,camera); } function clickDo() { frame++; partikelSystem.rotation.y += 0.01; var pCount = partikelAnzahl; while(pCount--) { // get the particle var particle = partikelGeo.vertices[pCount]; // check if we need to reset if(particle.position.y &lt; -200) { particle.position.y = 200; particle.velocity.y = 0; } // update the velocity with // a splat of randomniz particle.velocity.y -= Math.random() * .1; // and the position particle.position.addSelf( particle.velocity); } // flag to the particle system // that we've changed its vertices. partikelSystem. geometry. __dirtyVertices = true; } </code></pre> <p>Rah</p>
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    1. COwhat do you want to do with this particle? usually you need to use shaders for this purpose (here is a tutorial http://www.aerotwist.com/tutorials/an-introduction-to-shaders-part-1/). But if you want simply change the position of single particle, you can choose it from partikelGeo.vertices, change it coordinates and then set flag partikelGeo.verticesNeedUpdate to true (in old revisions of three.js I guess it is partikelGeo.__dirtyVertices = true).
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