Codrops 사례 연구
A field made of functions.
섹션 · MIT
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</style></head><body><main id="root" class="study"><header class="masthead"><strong>STYLEGALLERY / STUDIES</strong><span>CODE + CURIOSITY / 06</span><span>INDEPENDENT EXAMPLE</span></header><div class="intro"><div><p class="eyebrow">06 / Parametric GPU tubes</p><h1>A field made of functions.</h1></div><p>A fixed grid stores only strand number, progress and radial angle. A vertex shader turns those parameters into curved, opaque tubes with real surface normals.</p></div><div class="workbench"><div class="visual strand-lab"><canvas class="art-canvas" data-strands aria-label="An illuminated field of parametric tubes"></canvas><div class="fallback" data-gl-fallback hidden><h2>Rendering needs WebGL</h2><p>This study uses a locally authored shader. Its source, explanation and parameter controls remain available if a drawing context cannot be created.</p></div><div class="stage-note">Each ring is progress × angle. No CPU position rebuild while moving.</div></div><aside class="panel" aria-label="Study controls"><label class="control"><span>Growth reveal<output data-value="reveal">86</output></span><input aria-label="Growth reveal" data-control="reveal" type="range" min="0" max="100" value="86" step="1"></label><label class="control"><span>Tube radius<output data-value="radius">0.016</output></span><input aria-label="Tube radius" data-control="radius" type="range" min="0.005" max="0.04" value="0.016" step="0.001"></label><label class="control"><span>Curve speed<output data-value="speed">0.6</output></span><input aria-label="Curve speed" data-control="speed" type="range" min="0" max="2" value="0.6" step="0.1"></label><label class="control"><span>Radial sides</span><select data-control="sides"><option value="6">6 sides</option><option value="10" selected>10 sides</option><option value="16">16 sides</option></select></label><label class="control"><span>Brush horizontal<output data-value="brushX">0</output></span><input aria-label="Brush horizontal" data-control="brushX" type="range" min="-100" max="100" value="0" step="1"></label><label class="control"><span>Brush vertical<output data-value="brushY">0</output></span><input aria-label="Brush vertical" data-control="brushY" type="range" min="-100" max="100" value="0" step="1"></label><label class="control"><span>Light angle<output data-value="light">35</output></span><input aria-label="Light angle" data-control="light" type="range" min="-180" max="180" value="35" step="1"></label><div class="controls"><button type="button" data-play aria-pressed="false">Play motion</button><button type="button" data-action="center" >Center brush</button></div><output class="readout" data-readout>LOCAL GEOMETRY / READY TO EXPLORE</output></aside></div><div class="motion-bar"><label><input type="checkbox" data-static> Static view · less motion</label><p class="feedback" data-feedback aria-live="polite">Motion starts only when requested. All inputs are local.</p></div><details class="contract"><summary>What this study teaches</summary><p>A native WebGL vertex shader derives curve positions, finite-difference tangents, a cross-section frame and normals from immutable progress/angle attributes. The animated reveal changes radius rather than transparency. A stable reference-axis fallback prevents zero-length cross products for this bounded curve family; it does not promise a globally continuous frame for arbitrary curves.</p><p>Independent implementation informed by “Drawing With Light: An Exploration of Lit GPU Tubes with TSL and WebGPU”, Mathis Biabiany, Codrops. This is newly authored code and artwork, not a recovered original project. Independent mathematical strands replace the original hand-derived dataset. This study uses WebGL shaders rather than the publisher’s TSL/WebGPU runtime. The fallback axis is nondegenerate but cannot guarantee globally continuous frames for every possible curve.</p></details><noscript><div class="fallback"><p>This study’s explanation and initial HTML illustration remain available. Interactive rendering needs JavaScript.</p></div></noscript></main><script>/* Generated by scripts/build-codrops-article-studies.mjs.
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const vertex='precision highp float;attribute vec3 aParameter;uniform vec2 uResolution,uBrush;uniform float uTime,uRadius,uReveal;varying vec3 vNormal,vPosition;varying float vSeed;vec3 spine(float t,float seed){float lane=(seed-10.)*.09;float wave=sin(t*5.5+seed*.43+uTime)*.18;vec3 p=vec3(lane+wave,-.9+t*1.8,cos(t*6.+seed*.2+uTime)*.16);vec2 delta=p.xy-uBrush;float force=exp(-dot(delta,delta)*8.);p.x+=force*.24*sin(seed+uTime);p.z+=force*.16;return p;}void main(){float t=aParameter.x,a=aParameter.y,seed=aParameter.z;vec3 p=spine(t,seed);vec3 tangent=normalize(spine(t+.001,seed)-spine(t-.001,seed));vec3 axis=abs(tangent.z)>.92?vec3(0.,1.,0.):vec3(0.,0.,1.);vec3 n=normalize(cross(tangent,axis)),b=normalize(cross(tangent,n));vec3 normal=n*cos(a)+b*sin(a);float radius=uRadius*smoothstep(0.,.035,uReveal-t);p+=normal*radius;vNormal=normal;vPosition=p;vSeed=seed;float aspect=uResolution.x/uResolution.y;gl_Position=vec4(p.x/aspect,p.y,p.z*.3,1.);}';
const fragment='precision highp float;varying vec3 vNormal,vPosition;varying float vSeed;uniform float uLight;void main(){vec3 n=normalize(vNormal),light=normalize(vec3(cos(uLight),sin(uLight),-1.2));float diffuse=max(dot(n,light),0.);float spec=pow(max(dot(reflect(-light,n),vec3(0.,0.,-1.)),0.),35.);vec3 base=mix(vec3(.22,.72,.68),vec3(.94,.68,.38),step(.65,fract(vSeed*.37)));vec3 color=base*(.18+diffuse*.82)+spec*.7;gl_FragColor=vec4(color,1.);}';
const canvas=$('[data-strands]'),{gl,program,uniform}=createGL(canvas,fragment,vertex);let meshSides=0,vertexCount=0,uploads=0,curveTime=.8;
function buildParameterGrid(){const sides=number('sides');if(sides===meshSides)return;meshSides=sides;const data=[];for(let strand=0;strand<21;strand++)for(let step=0;step<90;step++)for(let side=0;side<sides;side++){const t=step/90,n=(step+1)/90,a=side/sides*Math.PI*2,b=(side+1)/sides*Math.PI*2;data.push(t,a,strand,n,a,strand,t,b,strand,t,b,strand,n,a,strand,n,b,strand);}gl.bufferData(gl.ARRAY_BUFFER,new Float32Array(data),gl.STATIC_DRAW);const location=gl.getAttribLocation(program,'aParameter');gl.enableVertexAttribArray(location);gl.vertexAttribPointer(location,3,gl.FLOAT,false,0,0);vertexCount=data.length/3;uploads++;}
function renderStrands(dt){buildParameterGrid();curveTime+=dt*number('speed');gl.enable(gl.DEPTH_TEST);gl.clearColor(.025,.075,.105,1);gl.clear(gl.COLOR_BUFFER_BIT|gl.DEPTH_BUFFER_BIT);uniform('uTime',curveTime);uniform('uRadius',number('radius'));uniform('uReveal',number('reveal')/100);uniform('uBrush',number('brushX')/100,number('brushY')/100);uniform('uLight',number('light')/180*Math.PI);gl.drawArrays(gl.TRIANGLES,0,vertexCount);setText('[data-readout]','STRANDS / 21\nVERTICES / '+vertexCount.toLocaleString('en-US')+'\nGRID UPLOADS / '+uploads+'\nREVEAL / RADIUS · OPAQUE\nFRAME / Z AXIS + Y FALLBACK');}
on(canvas,'pointermove',event=>{if(isReduced)return;const r=canvas.getBoundingClientRect();$('[data-control="brushX"]').value=String(clamp((event.clientX-r.left)/r.width*200-100,-100,100));$('[data-control="brushY"]').value=String(clamp(100-(event.clientY-r.top)/r.height*200,-100,100));repaint();});listen('center',()=>{$('[data-control="brushX"]').value='0';$('[data-control="brushY"]').value='0';repaint();});install(renderStrands);
}catch(error){report(error);}
requestAnimationFrame(()=>requestAnimationFrame(()=>{if(preview.status!=='error'){preview.status='mounted';document.body.dataset.previewStatus='mounted';parent.postMessage({type:'sg-preview-ready',id},'*');observe();setTimeout(observe,700);}}));
})();</script></body></html>
styles.css독립 구현
/* Generated by scripts/build-codrops-article-studies.mjs.
MIT License
Copyright (c) 2026 StyleGallery contributors
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Scope: independently authored study HTML, CSS, JavaScript, shaders and SVG only. Original articles, source projects, brands, artwork and screenshots are excluded. Their licenses and acquisition dispositions are unchanged.
*/
*{box-sizing:border-box}html{color-scheme:dark}html,body{margin:0;min-height:100%}body{background:var(--paper,#0c1321);color:var(--ink,#f4f3e9);font-family:Arial,Helvetica,sans-serif}button,input,select{font:inherit}button,select,input{min-width:0}button{background:transparent;border:1px solid #ffffff40;border-radius:999px;color:inherit;cursor:pointer;min-height:40px;padding:10px 16px}button:hover{background:#ffffff15}button[aria-pressed=true]{background:var(--accent,#dbff78);border-color:transparent;color:#122014}button:disabled{cursor:default;opacity:.6}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid var(--accent,#dbff78);outline-offset:4px}input,select{accent-color:var(--accent,#dbff78)}select,input[type=text],input[type=number]{background:#132235;border:1px solid #ffffff50;border-radius:7px;color:#fff;min-height:38px;padding:8px;width:100%}input[type=range]{display:block;min-height:30px;width:100%}a{color:inherit}svg{display:block;max-width:100%}h1,h2,p,figure{margin:0}h1{font-size:clamp(36px,6.5vw,78px);font-weight:500;letter-spacing:-.06em;line-height:.99}h2{font-size:24px;font-weight:500;letter-spacing:-.025em}p{line-height:1.55}.study{isolation:isolate;min-height:100vh;padding:clamp(18px,3.8vw,48px)}.masthead{align-items:center;display:flex;flex-wrap:wrap;font:10px/1.5 ui-monospace,monospace;gap:16px;justify-content:space-between;letter-spacing:.11em;margin-bottom:35px;text-transform:uppercase}.masthead strong{font-size:12px;letter-spacing:-.02em}.intro{display:grid;gap:18px;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);margin-bottom:30px;align-items:end}.intro p{color:var(--muted,#b7c7d4);font-size:13px;max-width:38em}.eyebrow{color:var(--accent,#dbff78);font:10px/1.4 ui-monospace,monospace;letter-spacing:.14em;margin-bottom:12px;text-transform:uppercase}.workbench{display:grid;gap:20px;grid-template-columns:minmax(0,1fr) 230px}.visual{background:var(--surface,#101d2b);border:1px solid #ffffff20;border-radius:20px;min-width:0;overflow:hidden;position:relative}.drawing{height:auto;width:100%}.art-canvas{aspect-ratio:1.55;display:block;height:auto;width:100%}.panel{align-content:start;display:grid;gap:17px}.control{display:grid;font-size:11px;gap:7px;min-width:0}.control>span{display:flex;gap:10px;justify-content:space-between}.control output{color:var(--accent,#dbff78);font-family:ui-monospace,monospace}.controls{display:flex;flex-wrap:wrap;gap:8px}.readout{background:#ffffff09;border:1px solid #ffffff18;border-radius:12px;font:11px/1.7 ui-monospace,monospace;overflow-wrap:anywhere;padding:14px;white-space:pre-line}.legend{align-items:center;display:flex;flex-wrap:wrap;font:10px/1.6 ui-monospace,monospace;gap:16px;padding:16px 20px}.legend i{background:var(--accent,#dbff78);border-radius:50%;display:inline-block;height:6px;margin-right:6px;width:6px}.contract{border-top:1px solid #ffffff20;color:var(--muted,#b7c7d4);font-size:11px;margin-top:28px;padding-top:18px}.contract summary{color:var(--ink,#f4f3e9);cursor:pointer;font-size:12px}.contract p{margin-top:10px;max-width:90ch}.motion-bar{align-items:center;border-top:1px solid #ffffff20;display:flex;flex-wrap:wrap;font-size:11px;gap:12px;justify-content:space-between;margin-top:26px;padding-top:18px}.motion-bar label{align-items:center;display:flex;gap:8px}.feedback{color:var(--muted,#b7c7d4);font:11px/1.5 ui-monospace,monospace;min-height:18px}.visually-hidden{clip-path:inset(50%);height:1px;overflow:hidden;position:absolute;width:1px}[hidden]{display:none!important}.stage-note{background:#07111ac9;bottom:18px;color:#dfe8f0;font:11px/1.5 ui-monospace,monospace;left:18px;max-width:calc(100% - 36px);padding:8px 12px;position:absolute;z-index:2}.big-number{font-size:clamp(70px,14vw,180px);letter-spacing:-.08em;line-height:1}.plain-list{display:grid;gap:12px;list-style:none;margin:0;padding:0}.plain-list li{border-bottom:1px solid #ffffff20;padding:12px 0}.tabs{display:flex;flex-wrap:wrap;gap:7px}.tabs button{font-size:11px}.two{display:grid;gap:20px;grid-template-columns:1fr 1fr}.code-sample{color:#c9ecbe;font:11px/1.7 ui-monospace,monospace;overflow:auto;white-space:pre-wrap}.fallback{padding:30px}.fallback p{max-width:38ch}.static-gallery{display:none}.study[data-reduced=true] .static-gallery{display:grid}.study[data-reduced=true] .animated-story{display:none}.study[data-reduced=true] *{animation:none!important;transition:none!important}body[data-preview-status=error] .feedback{color:#ffbba3}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;scroll-behavior:auto!important;transition:none!important}}@media(max-width:700px){.intro{grid-template-columns:1fr}.workbench{grid-template-columns:1fr}.panel{grid-template-columns:repeat(2,minmax(0,1fr))}.panel>.readout,.panel>.controls{grid-column:1/-1}.masthead{margin-bottom:26px}.two{grid-template-columns:1fr}}@media(max-width:380px){.panel{gap:12px}.control{font-size:10px}.panel button{font-size:11px;padding:9px 12px}.legend{gap:8px;padding:12px}.visual{border-radius:13px}}
.strand-lab{background:#081924}.strand-lab .art-canvas{aspect-ratio:1.3}.strand-lab .stage-note{font-size:9px}
@media(max-height:550px) and (min-width:500px){
.study{padding:18px}.masthead{font-size:8px;gap:10px;margin-bottom:16px}.masthead strong{font-size:10px}.intro{gap:18px;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);margin-bottom:18px}.intro h1{font-size:34px}.intro p{font-size:10px;line-height:1.5}.intro .eyebrow{font-size:8px;margin-bottom:8px}.workbench{gap:16px;grid-template-columns:minmax(0,1fr) 174px}.panel{gap:10px;grid-template-columns:1fr}.panel .control{font-size:9px;gap:3px}.panel .control input[type=range]{min-height:22px}.panel select,.panel input[type=text],.panel input[type=number]{font-size:10px;min-height:31px;padding:6px}.panel .controls{gap:5px}.panel button{font-size:9px;min-height:30px;padding:7px 10px}.panel .readout{font-size:8px;padding:10px}.art-canvas{aspect-ratio:auto!important;height:250px;object-fit:contain}.legend{font-size:8px;gap:8px;padding:10px 13px}.stage-note{bottom:12px;font-size:8px;left:12px;padding:5px 8px}.type-lab{min-height:280px;padding:23px}.type-heading{font-size:36px}.particle-rack{height:80px}.type-rule{font-size:7px}.bounce-lab>.drawing{height:230px;object-fit:contain}.track-graph{padding:9px 16px}.track-graph svg{height:43px}.member-lab{min-height:300px;padding:18px}.member-heading h2{font-size:24px}.member-collage{height:180px}.member-total .counter{font-size:52px}.member-total>span{font-size:7px}.member-card span{font-size:6px;padding:4px}.composer-surface{padding:20px}.composer-label{font-size:8px;margin-bottom:20px}.form-set{gap:10px}.form-set h2{font-size:20px;margin-top:12px}.form-set p{font-size:9px}.timeline-rows{padding:12px 17px}.mascot-lab>.drawing{height:250px;object-fit:contain}.pose-strip{padding:10px 14px}.pose-marker{font-size:8px;padding:6px 0}.fit-stage{min-height:270px;padding:20px}.fit-stage canvas{max-height:235px}.tree-columns{grid-template-columns:125px minmax(0,1fr);min-height:320px}.tree-inspector{padding:17px 12px}.tree-inspector pre{font-size:8px;margin-top:18px}.tree-rules{display:none}.tree-preview{min-height:0;padding:14px}.tree-width-label,.tree-caption{font-size:7px}.fixture-copy h2{font-size:1.6em}.fixture-copy p{font-size:.65em}.fixture-output{gap:10px;padding:12px}.fixture-art{max-height:90px}.semantic-lab{grid-template-columns:110px minmax(0,1fr);min-height:320px}.node-list{flex-direction:column;padding:12px 7px}.node-list button{font-size:8px;gap:5px;padding:9px 7px}.node-list button small{font-size:7px}.semantic-preview{padding:14px}.semantic-fixture{padding:8px}.semantic-fixture h2{font-size:27px}.semantic-fixture p{font-size:10px}.semantic-art{height:75px}.markup-panel{padding:15px}.markup-panel pre{font-size:8px}.plant-lab{padding:18px}.plant-heading h2{font-size:28px}.plant-heading span{font-size:8px}.plant-illustration{margin:-60px 0 -8px}.plant-illustration svg{height:250px}.plant-callouts{gap:5px}.plant-callouts button{font-size:7px;min-height:28px;padding:7px}.plant-feature,.care-plan{font-size:10px}.orbit-lab{min-height:300px}.orbit-camera{height:270px}.orbit-ring{height:170px;width:110px}.orbit-card{height:170px;width:110px}.orbit-foot{font-size:8px;padding:10px 14px}.botanical-window{aspect-ratio:1.5}.window-label h2{font-size:29px}.window-label span{font-size:8px}.gold-lab{padding:18px}.gold-heading h2{font-size:28px;margin-top:9px}.gold-heading>span,.gold-total>span{font-size:7px}.gold-lab>svg{height:175px;margin:-27px 0 -6px}.gold-total{padding-top:9px}.gold-total output{font-size:43px}.gold-disclaimer{font-size:9px}.story-controls{gap:10px;grid-template-columns:repeat(4,minmax(0,1fr));padding:10px 0;position:relative}.story-controls .control{font-size:8px}.story-controls input[type=range]{min-height:20px}.story-controls>.controls{grid-column:auto}.story-controls button{font-size:8px;min-height:27px;padding:6px 8px}.story-pin{top:10px}.story-pin>.visual{min-height:270px}.story-pin .art-canvas{height:270px}.story-copy{bottom:20px;left:20px;max-width:255px}.story-chapter h2{font-size:29px;margin:8px 0}.story-chapter p{font-size:10px}.story-chapter>span{font-size:8px}.moon-lab{aspect-ratio:auto;min-height:270px}.moon-progress,.cylinder-energy,.terrain-coordinates{font-size:8px}.story-skip{font-size:9px;margin-bottom:10px}.reading-chapter{grid-template-columns:1fr 1fr}.motion-bar{margin-top:18px}
}
함께 쓰는 파일 5개 보기
script.js독립 구현
/* Generated by scripts/build-codrops-article-studies.mjs.
MIT License
Copyright (c) 2026 StyleGallery contributors
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Scope: independently authored study HTML, CSS, JavaScript, shaders and SVG only. Original articles, source projects, brands, artwork and screenshots are excluded. Their licenses and acquisition dispositions are unchanged.
*/
(() => {
'use strict';
const id="codrops-491efbb3428f",stage=document.querySelector('.study');
const preview=window.__STYLEGALLERY_PREVIEW__={id,status:'loading',errors:[]};
const report=error=>{const message=error instanceof Error?error.message:String(error);if(!preview.errors.includes(message))preview.errors.push(message);preview.status='error';document.body.dataset.previewStatus='error';parent.postMessage({type:'sg-preview-error',id,message},'*');const feedback=document.querySelector('[data-feedback]');if(feedback)feedback.textContent=message;};
addEventListener('error',event=>report(event.error||event.message));addEventListener('unhandledrejection',event=>report(event.reason));
const $=selector=>stage.querySelector(selector),$$=selector=>[...stage.querySelectorAll(selector)];
const value=key=>$('[data-control="'+key+'"]').value,number=key=>Number(value(key));
const clamp=(x,a=0,b=1)=>Math.max(a,Math.min(b,x)),lerp=(a,b,t)=>a+(b-a)*t;
const setText=(selector,text)=>{const node=$(selector);if(node)node.textContent=text;};
const media=matchMedia('(prefers-reduced-motion: reduce)');
let isReduced=media.matches,playing=false,time=0,draw=()=>{},raf=0,last=0,disposed=false;
const cleanups=[],on=(target,type,fn,options)=>{target.addEventListener(type,fn,options);cleanups.push(()=>target.removeEventListener(type,fn,options));};
const listen=(key,fn)=>on($('[data-action="'+key+'"]'),'click',fn);
const repaint=()=>{if(!disposed){try{draw(0);}catch(error){report(error);}}};
const loop=now=>{raf=0;if(disposed||!playing||isReduced)return;const dt=Math.min((now-last)/1000,.05);last=now;time+=dt;try{draw(dt);}catch(error){report(error);stop();return;}raf=requestAnimationFrame(loop);};
function stop(){playing=false;cancelAnimationFrame(raf);raf=0;$$('[data-play]').forEach(button=>{button.setAttribute('aria-pressed','false');button.textContent=isReduced?'Static view active':'Play motion';});}
function start(){if(isReduced)return;playing=true;last=performance.now();$$('[data-play]').forEach(button=>{button.setAttribute('aria-pressed','true');button.textContent='Pause motion';});if(!raf)raf=requestAnimationFrame(loop);}
function applyMotionPreference(){isReduced=media.matches||$('[data-static]').checked;stage.dataset.reduced=String(isReduced);if(isReduced)stop();$$('[data-play]').forEach(button=>{button.disabled=isReduced;button.textContent=playing?'Pause motion':isReduced?'Static view active':'Play motion';});repaint();}
function install(render){draw=render;applyMotionPreference();}
const observe=()=>{const root=document.getElementById('root'),elements=[...root.querySelectorAll('*')],rect=root.getBoundingClientRect();parent.postMessage({type:'sg-preview-observation',id,diagnostics:{textLength:root.textContent.trim().length,elementCount:elements.length,visibleElementCount:elements.filter(element=>{const r=element.getBoundingClientRect(),s=getComputedStyle(element);return r.width>0&&r.height>0&&s.display!=='none'&&s.visibility!=='hidden'&&Number(s.opacity)!==0;}).length,images:[],canvases:$$('canvas').map(c=>({width:c.width,height:c.height})),rootRect:{width:rect.width,height:rect.height},documentWidth:document.documentElement.scrollWidth,viewportWidth:innerWidth}},'*');};
on(media,'change',applyMotionPreference);on($('[data-static]'),'change',applyMotionPreference);
$$('[data-play]').forEach(button=>on(button,'click',()=>playing?stop():start()));
$$('[data-control]').forEach(input=>on(input,'input',()=>{const output=$('[data-value="'+input.dataset.control+'"]');if(output)output.textContent=input.value;if(input.dataset.control!=='story')repaint();}));
on(document,'visibilitychange',()=>{if(document.hidden)stop();});
on(window,'pagehide',()=>{disposed=true;stop();cleanups.forEach(fn=>fn());});
function canvas2D(selector,width=900,height=580){const canvas=$(selector);canvas.width=width;canvas.height=height;const context=canvas.getContext('2d');if(!context)throw Error('A 2D drawing surface is unavailable.');return {canvas,ctx:context,width,height};}
function createGL(canvas,fragment,vertex){const gl=canvas.getContext('webgl',{alpha:false,antialias:true,preserveDrawingBuffer:true});if(!gl){canvas.hidden=true;const fallback=$('[data-gl-fallback]');if(fallback)fallback.hidden=false;throw Error('WebGL is unavailable. The study explanation and controls remain readable.');}
const shader=(type,source)=>{const s=gl.createShader(type);gl.shaderSource(s,source);gl.compileShader(s);if(!gl.getShaderParameter(s,gl.COMPILE_STATUS))throw Error(gl.getShaderInfoLog(s));return s;};
const vs=shader(gl.VERTEX_SHADER,vertex||'attribute vec2 aPosition;varying vec2 vUv;void main(){vUv=aPosition*.5+.5;gl_Position=vec4(aPosition,0.,1.);}'),fs=shader(gl.FRAGMENT_SHADER,fragment),program=gl.createProgram();gl.attachShader(program,vs);gl.attachShader(program,fs);gl.linkProgram(program);if(!gl.getProgramParameter(program,gl.LINK_STATUS))throw Error(gl.getProgramInfoLog(program));gl.useProgram(program);
const buffer=gl.createBuffer();gl.bindBuffer(gl.ARRAY_BUFFER,buffer);if(!vertex){gl.bufferData(gl.ARRAY_BUFFER,new Float32Array([-1,-1,1,-1,-1,1,-1,1,1,-1,1,1]),gl.STATIC_DRAW);const location=gl.getAttribLocation(program,'aPosition');gl.enableVertexAttribArray(location);gl.vertexAttribPointer(location,2,gl.FLOAT,false,0,0);}
const uniforms=new Map(),uniform=(name,...args)=>{if(!uniforms.has(name))uniforms.set(name,gl.getUniformLocation(program,name));const location=uniforms.get(name);if(location===null)return;if(args[0] instanceof Float32Array)gl.uniform3fv(location,args[0]);else gl['uniform'+args.length+'f'](location,...args);};
function resize(){const r=canvas.getBoundingClientRect();canvas.width=Math.max(1,Math.round(Math.min(r.width,850)));canvas.height=Math.max(1,Math.round(canvas.width/(r.width/Math.max(1,r.height))));gl.viewport(0,0,canvas.width,canvas.height);uniform('uResolution',canvas.width,canvas.height);repaint();}
const observer=new ResizeObserver(resize);observer.observe(canvas);cleanups.push(()=>{observer.disconnect();gl.deleteBuffer(buffer);gl.deleteProgram(program);gl.deleteShader(vs);gl.deleteShader(fs);});resize();return {gl,program,buffer,uniform,resize};}
try{
const vertex='precision highp float;attribute vec3 aParameter;uniform vec2 uResolution,uBrush;uniform float uTime,uRadius,uReveal;varying vec3 vNormal,vPosition;varying float vSeed;vec3 spine(float t,float seed){float lane=(seed-10.)*.09;float wave=sin(t*5.5+seed*.43+uTime)*.18;vec3 p=vec3(lane+wave,-.9+t*1.8,cos(t*6.+seed*.2+uTime)*.16);vec2 delta=p.xy-uBrush;float force=exp(-dot(delta,delta)*8.);p.x+=force*.24*sin(seed+uTime);p.z+=force*.16;return p;}void main(){float t=aParameter.x,a=aParameter.y,seed=aParameter.z;vec3 p=spine(t,seed);vec3 tangent=normalize(spine(t+.001,seed)-spine(t-.001,seed));vec3 axis=abs(tangent.z)>.92?vec3(0.,1.,0.):vec3(0.,0.,1.);vec3 n=normalize(cross(tangent,axis)),b=normalize(cross(tangent,n));vec3 normal=n*cos(a)+b*sin(a);float radius=uRadius*smoothstep(0.,.035,uReveal-t);p+=normal*radius;vNormal=normal;vPosition=p;vSeed=seed;float aspect=uResolution.x/uResolution.y;gl_Position=vec4(p.x/aspect,p.y,p.z*.3,1.);}';
const fragment='precision highp float;varying vec3 vNormal,vPosition;varying float vSeed;uniform float uLight;void main(){vec3 n=normalize(vNormal),light=normalize(vec3(cos(uLight),sin(uLight),-1.2));float diffuse=max(dot(n,light),0.);float spec=pow(max(dot(reflect(-light,n),vec3(0.,0.,-1.)),0.),35.);vec3 base=mix(vec3(.22,.72,.68),vec3(.94,.68,.38),step(.65,fract(vSeed*.37)));vec3 color=base*(.18+diffuse*.82)+spec*.7;gl_FragColor=vec4(color,1.);}';
const canvas=$('[data-strands]'),{gl,program,uniform}=createGL(canvas,fragment,vertex);let meshSides=0,vertexCount=0,uploads=0,curveTime=.8;
function buildParameterGrid(){const sides=number('sides');if(sides===meshSides)return;meshSides=sides;const data=[];for(let strand=0;strand<21;strand++)for(let step=0;step<90;step++)for(let side=0;side<sides;side++){const t=step/90,n=(step+1)/90,a=side/sides*Math.PI*2,b=(side+1)/sides*Math.PI*2;data.push(t,a,strand,n,a,strand,t,b,strand,t,b,strand,n,a,strand,n,b,strand);}gl.bufferData(gl.ARRAY_BUFFER,new Float32Array(data),gl.STATIC_DRAW);const location=gl.getAttribLocation(program,'aParameter');gl.enableVertexAttribArray(location);gl.vertexAttribPointer(location,3,gl.FLOAT,false,0,0);vertexCount=data.length/3;uploads++;}
function renderStrands(dt){buildParameterGrid();curveTime+=dt*number('speed');gl.enable(gl.DEPTH_TEST);gl.clearColor(.025,.075,.105,1);gl.clear(gl.COLOR_BUFFER_BIT|gl.DEPTH_BUFFER_BIT);uniform('uTime',curveTime);uniform('uRadius',number('radius'));uniform('uReveal',number('reveal')/100);uniform('uBrush',number('brushX')/100,number('brushY')/100);uniform('uLight',number('light')/180*Math.PI);gl.drawArrays(gl.TRIANGLES,0,vertexCount);setText('[data-readout]','STRANDS / 21\nVERTICES / '+vertexCount.toLocaleString('en-US')+'\nGRID UPLOADS / '+uploads+'\nREVEAL / RADIUS · OPAQUE\nFRAME / Z AXIS + Y FALLBACK');}
on(canvas,'pointermove',event=>{if(isReduced)return;const r=canvas.getBoundingClientRect();$('[data-control="brushX"]').value=String(clamp((event.clientX-r.left)/r.width*200-100,-100,100));$('[data-control="brushY"]').value=String(clamp(100-(event.clientY-r.top)/r.height*200,-100,100));repaint();});listen('center',()=>{$('[data-control="brushX"]').value='0';$('[data-control="brushY"]').value='0';repaint();});install(renderStrands);
}catch(error){report(error);}
requestAnimationFrame(()=>requestAnimationFrame(()=>{if(preview.status!=='error'){preview.status='mounted';document.body.dataset.previewStatus='mounted';parent.postMessage({type:'sg-preview-ready',id},'*');observe();setTimeout(observe,700);}}));
})();LICENSE독립 구현
MIT License
Copyright (c) 2026 StyleGallery contributors
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Scope: independently authored study HTML, CSS, JavaScript, shaders and SVG only. Original articles, source projects, brands, artwork and screenshots are excluded. Their licenses and acquisition dispositions are unchanged.
NOTES.md독립 구현
# A field made of functions.
Independent article case study. Domain: website consumer / Design Engineering presentation.
A native WebGL vertex shader derives curve positions, finite-difference tangents, a cross-section frame and normals from immutable progress/angle attributes. The animated reveal changes radius rather than transparency. A stable reference-axis fallback prevents zero-length cross products for this bounded curve family; it does not promise a globally continuous frame for arbitrary curves.
## Attribution and evidence
Studied: [Drawing With Light: An Exploration of Lit GPU Tubes with TSL and WebGPU](https://tympanus.net/codrops/2026/09/07/drawing-with-light-an-exploration-of-lit-gpu-tubes-with-tsl-and-webgpu/), Mathis Biabiany. Article SHA-256: a30040c4d3bdf7c8ff56f13c4b6e2782736ae1a7eafd91410614046372570395. Analysis SHA-256: 784ae8e9c29d0353860261969d5fd3c6fa5b11d7eb4088d1518f340c011dddca. Source revision: 40f0c44e3ac76b0a496bc57cdabcb2952b15fb8e133da23bf2e418407fa137c6. The revision hashes the article/analysis hashes, the analyst principle and code-block evidence references; it identifies studied evidence, not a claim that the original demo executes.
Original acquisition: unresolved. Original license: unverified. originalSourceAcquired: false. Linked live experiment files are cached, but no complete licensed source release or original hand/strand dataset was established. Four tube-geometry/shader fragments are present in the article.
No original article prose, code, artwork, source project or screenshot is distributed here. The authored-code MIT notice applies only to the independent implementation. Independent mathematical strands replace the original hand-derived dataset. This study uses WebGL shaders rather than the publisher’s TSL/WebGPU runtime. The fallback axis is nondegenerate but cannot guarantee globally continuous frames for every possible curve.
## Initial state and controls
A fixed grid stores only strand number, progress and radial angle. A vertex shader turns those parameters into curved, opaque tubes with real surface normals.
The page starts stationary. Play motion, where present, advances this study’s presentation until paused; text, bounce, portrait, orbit, strand and mascot motion loops, while the event composer stops at its endpoint. Scroll studies advance through ordinary document scroll or their chapter buttons. Static view stops time-based motion; manual controls still inspect values. The three scroll studies instead show every chapter in ordinary reading flow. Pointer parallax centers its decorative layers.
Initial control values:
| Control key | Value |
| --- | --- |
| reveal | 86 |
| radius | 0.016 |
| speed | 0.6 |
| sides | 10 |
| brushX | 0 |
| brushY | 0 |
| light | 35 |
## Running and editing
Open index.html directly. It contains all runtime code and visuals and needs no package install, account, network, remote asset or browser-origin storage. Edit its inline style and script to change the downloaded page. styles.css and script.js are reference copies of the inline source; changing those copies alone does not change the running page. Repository regeneration overwrites index.html and all generated copies, including any manual edits. Keep a separate copy when editing a download. The repository authoring modules in vendor/codrops-article-studies/scenes-*.mjs and runtime.mjs regenerate these copies through node scripts/build-codrops-article-studies.mjs. Repository regeneration also needs the private source evidence; downloaded-page execution does not.
## Verification boundary
This generation passed the captured article/analysis hash checks, exact ID membership, local canonical Markdown anchor/hash checks, implementation-symbol checks, JavaScript parsing, semantic main/title counts, duplicate-ID checks and runtime URL/storage exclusion. The manifest codeFiles entries identify every emitted file by SHA-256. Each code symbol is a searchable named function, not a claimed executed call trace. Proposed checks are in KNOWLEDGE.json. runtime_verified: false. SG artifact capture proves only a recorded initial render; no interactive runtime, keyboard, accessibility, comfort or performance result is claimed.
Manual Chrome interaction is blocked by extension UI in this session. No alternate browser-control route was used. Preview sizing is native responsive width. Initial-render captures are tracked separately at site/artifacts/full-import/preview-posters/index.json and site/artifacts/full-import/preview-posters/visual-review.json in the repository. No capture receipt is bundled with this download. The bounded initial-render matrix requests all 21 studies at 320 pixels and three representative studies at 1280 pixels; the separate poster surface is 640 × 420. The authored CSS also adapts at 375 and 768 pixels, without claiming those widths were captured. A width request does not mean that capture exists or passed. Motion starts on explicit playback; system reduced motion and the Static view switch stop it.
consumer_reference: consumer-reference/agent-native/registry.json
KNOWLEDGE.json독립 구현
[
{
"id": "codrops-491efbb3428f-article-0",
"source": "motion/rendering-and-performance.md",
"anchor": "a-diagnostic-sequence",
"sourceSha256": "1523fdeaa290fa064c4db17d36040de3f35ad39bb18a37517ceb5995f97d1dfd",
"title": "06 / Parametric GPU tubes · buildParameterGrid",
"principle": "The upload counter distinguishes grid construction from animated uniform updates; this is a mechanism probe, not a frame-rate claim.",
"application": "A native WebGL vertex shader derives curve positions, finite-difference tangents, a cross-section frame and normals from immutable progress/angle attributes. The animated reveal changes radius rather than transparency. A stable reference-axis fallback prevents zero-length cross products for this bounded curve family; it does not promise a globally continuous frame for arbitrary curves. This binding describes the authored study and does not verify the original project.",
"code": [
{
"file": "vendor/codrops-article-studies/records/codrops-491efbb3428f/script.js",
"symbol": "buildParameterGrid",
"explanation": "The named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles."
}
],
"checks": [
{
"id": "codrops-491efbb3428f-buildParameterGrid",
"action": "Play motion, change radius and reveal, then change radial sides.",
"expected": "The grid upload count stays fixed for motion/radius/reveal and increments only when radial topology changes."
}
],
"runtime_verified": false
},
{
"id": "codrops-491efbb3428f-article-1",
"source": "design-engineering/component-contract.md",
"anchor": "contract-template",
"sourceSha256": "79e496160e28ab26397d2c5b68075fd14c732d13002ff6c6e41c031d86cac039",
"title": "06 / Parametric GPU tubes · renderStrands",
"principle": "The brush has native X/Y controls in addition to pointer motion; display inputs stay independent of the decorative shader.",
"application": "A native WebGL vertex shader derives curve positions, finite-difference tangents, a cross-section frame and normals from immutable progress/angle attributes. The animated reveal changes radius rather than transparency. A stable reference-axis fallback prevents zero-length cross products for this bounded curve family; it does not promise a globally continuous frame for arbitrary curves. This binding describes the authored study and does not verify the original project.",
"code": [
{
"file": "vendor/codrops-article-studies/records/codrops-491efbb3428f/script.js",
"symbol": "renderStrands",
"explanation": "The named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles."
}
],
"checks": [
{
"id": "codrops-491efbb3428f-renderStrands",
"action": "Enable Static view and move Brush horizontal/vertical using the keyboard.",
"expected": "The shader renders the requested stationary bend with playback disabled and all values readable."
}
],
"runtime_verified": false
},
{
"id": "codrops-491efbb3428f-article-2",
"source": "motion/accessible-motion.md",
"anchor": "preference-changes-during-work",
"sourceSha256": "db0ad692d5bb3103a3cbe13ec08dbe5cf12552aed7ecf2c93b1d7cc0b8a34b8b",
"title": "06 / Parametric GPU tubes · applyMotionPreference",
"principle": "One effective preference owns CSS and script playback. The initial view is stationary, and manual controls retain the study values.",
"application": "A native WebGL vertex shader derives curve positions, finite-difference tangents, a cross-section frame and normals from immutable progress/angle attributes. The animated reveal changes radius rather than transparency. A stable reference-axis fallback prevents zero-length cross products for this bounded curve family; it does not promise a globally continuous frame for arbitrary curves. This binding describes the authored study and does not verify the original project.",
"code": [
{
"file": "vendor/codrops-article-studies/records/codrops-491efbb3428f/script.js",
"symbol": "applyMotionPreference",
"explanation": "The named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles."
}
],
"checks": [
{
"id": "codrops-491efbb3428f-applyMotionPreference",
"action": "Enable Static view during playback, then adjust the visible native controls.",
"expected": "Playback stops, its button is disabled while the preference applies, and the current values remain inspectable without continuous motion."
}
],
"runtime_verified": false
}
]
RETRIEVAL-LOG.md독립 구현
# Retrieval log
Understood as: preserve all 21 original catalog IDs and acquisition dispositions while independently implementing each article’s technical principle as a consumer-owned case study.
SG discover and workflow read from site-compiler revision 6deb1970c80ed113b90be8d6ca617616bbe336c4; workflow SHA-256 0318a99707293af423e52b99b40cf1d87d9c7725e3ab06c5a231e3946f2bebb9. Stage 3 handoff is the primary implementation brief. No original scene assets or source files are reused.
Read-only canonical traversal:
1. AGENTS.md
2. README.md
3. DOMAINS.md
4. GOVERNANCE.md
5. design-engineering/index.md
6. motion/index.md
7. design-engineering/component-contract.md
8. design-engineering/state-management/patterns/derived-state.md
9. design-engineering/native-interaction-contracts.md
10. motion/accessible-motion.md
11. motion/rendering-and-performance.md
12. motion/interruption-and-retargeting.md
13. motion/interaction-recipes.md
Applied canonical sections and current-authoring hashes are recorded in KNOWLEDGE.json. No design-terminology records are relied on. External references within canonical guidance were not independently rechecked by this implementation lane; only the local sections and article capture identities were checked. Root Layout corpus, Game UI, provider integrations and publisher export claims were rejected as outside this lane.
BEHIND THE EXAMPLE
이 장면을 만드는 원리
06 / Parametric GPU tubes · buildParameterGrid
The upload counter distinguishes grid construction from animated uniform updates; this is a mechanism probe, not a frame-rate claim.
- 이 예제에서는
- A native WebGL vertex shader derives curve positions, finite-difference tangents, a cross-section frame and normals from immutable progress/angle attributes. The animated reveal changes radius rather than transparency. A stable reference-axis fallback prevents zero-length cross products for this bounded curve family; it does not promise a globally continuous frame for arbitrary curves. This binding describes the authored study and does not verify the original project.
코드와 함께 확인하기
코드에서 찾기
buildParameterGridscript.jsThe named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles.
직접 해보기
Play motion, change radius and reveal, then change radial sides.
살펴볼 변화The grid upload count stays fixed for motion/radius/reveal and increments only when radial topology changes.
06 / Parametric GPU tubes · renderStrands
The brush has native X/Y controls in addition to pointer motion; display inputs stay independent of the decorative shader.
- 이 예제에서는
- A native WebGL vertex shader derives curve positions, finite-difference tangents, a cross-section frame and normals from immutable progress/angle attributes. The animated reveal changes radius rather than transparency. A stable reference-axis fallback prevents zero-length cross products for this bounded curve family; it does not promise a globally continuous frame for arbitrary curves. This binding describes the authored study and does not verify the original project.
코드와 함께 확인하기
코드에서 찾기
renderStrandsscript.jsThe named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles.
직접 해보기
Enable Static view and move Brush horizontal/vertical using the keyboard.
살펴볼 변화The shader renders the requested stationary bend with playback disabled and all values readable.
06 / Parametric GPU tubes · applyMotionPreference
One effective preference owns CSS and script playback. The initial view is stationary, and manual controls retain the study values.
- 이 예제에서는
- A native WebGL vertex shader derives curve positions, finite-difference tangents, a cross-section frame and normals from immutable progress/angle attributes. The animated reveal changes radius rather than transparency. A stable reference-axis fallback prevents zero-length cross products for this bounded curve family; it does not promise a globally continuous frame for arbitrary curves. This binding describes the authored study and does not verify the original project.
코드와 함께 확인하기
코드에서 찾기
applyMotionPreferencescript.jsThe named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles.
직접 해보기
Enable Static view during playback, then adjust the visible native controls.
살펴볼 변화Playback stops, its button is disabled while the preference applies, and the current values remain inspectable without continuous motion.