Codrops 사례 연구
One object. Two truths.
배경 · MIT
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</style></head><body><main id="root" class="study"><header class="masthead"><strong>STYLEGALLERY / STUDIES</strong><span>CODE + CURIOSITY / 03</span><span>INDEPENDENT EXAMPLE</span></header><div class="intro"><div><p class="eyebrow">03 / Material passes & compositing</p><h1>One object. Two truths.</h1></div><p>A knotted surface is drawn twice: once as a lit solid and once as a line network. A soft moving mask decides which rendering reaches the final image.</p></div><div class="workbench"><div class="visual knot-lab"><canvas class="art-canvas" data-knot aria-label="A torus knot blending solid faces and wireframe"></canvas><div class="legend"><span><i></i>SOLID TARGET</span><span>＋</span><span><i style="background:#8ce9e3"></i>WIRE TARGET</span><span>× DIRECTIONAL MASK</span></div></div><aside class="panel" aria-label="Study controls"><label class="control"><span>Reveal<output data-value="reveal">53</output></span><input aria-label="Reveal" data-control="reveal" type="range" min="0" max="100" value="53" step="1"></label><label class="control"><span>Mask angle<output data-value="angle">12</output></span><input aria-label="Mask angle" data-control="angle" type="range" min="-90" max="90" value="12" step="1"></label><label class="control"><span>Mask softness<output data-value="softness">25</output></span><input aria-label="Mask softness" data-control="softness" type="range" min="1" max="70" value="25" step="1"></label><label class="control"><span>Object rotation<output data-value="rotation">25</output></span><input aria-label="Object rotation" data-control="rotation" type="range" min="0" max="360" value="25" step="1"></label><label class="control"><span>Output pass</span><select data-control="pass"><option value="mix" selected>Composite</option><option value="solid">Solid only</option><option value="wire">Wire only</option></select></label><div class="controls"><button type="button" data-play aria-pressed="false">Play motion</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>An independently generated torus knot is projected once into two offscreen 2D render targets. Solid and wire passes share geometry and camera; a directional alpha mask composites their outputs. This browser-canvas study isolates the article’s render-target principle without claiming its Three.js shader implementation.</p><p>Independent implementation informed by “Building a Blended Material Shader in WebGL with Solid.js”, Nathan Nye, Codrops. This is newly authored code and artwork, not a recovered original project. Uses independently authored Canvas 2D render targets and a compositing mask rather than the original Three.js project. No original source or assets are included.</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 mesh=[];for(let i=0;i<=112;i++){const t=i/112*Math.PI*2,p=knotPoint(t),tangent=unit(subtract(knotPoint(t+.001),p)),reference=Math.abs(tangent[2])>.93?[0,1,0]:[0,0,1],n=unit(cross(tangent,reference)),b=cross(tangent,n),ring=[];for(let j=0;j<12;j++){const a=j/12*Math.PI*2;ring.push(p.map((v,k)=>v+.43*(Math.cos(a)*n[k]+Math.sin(a)*b[k])));}mesh.push(ring);}
function projectKnot(p,angle){const x=p[0]*Math.cos(angle)+p[2]*Math.sin(angle),z=-p[0]*Math.sin(angle)+p[2]*Math.cos(angle),y=p[1]*.78-z*.62,depth=p[1]*.62+z*.78,scale=105*8/(8-depth);return [W/2+x*scale,H/2+y*scale,depth];}
function compositeMaterialPasses(dt){if(dt){$('[data-control="rotation"]').value=String((number('rotation')+dt*18)%360);}const angle=number('rotation')/180*Math.PI,points=mesh.map(ring=>ring.map(p=>projectKnot(p,angle))),faces=[];for(let i=0;i<112;i++)for(let j=0;j<12;j++){const vertices=[points[i][j],points[i+1][j],points[i+1][(j+1)%12],points[i][(j+1)%12]];faces.push({vertices,depth:vertices.reduce((s,p)=>s+p[2],0)/4,i,j});}faces.sort((a,b)=>a.depth-b.depth);
for(let pass=0;pass<2;pass++){const c=targets[pass].ctx;c.clearRect(0,0,W,H);c.fillStyle='#101827';c.fillRect(0,0,W,H);for(const face of faces){c.beginPath();face.vertices.forEach((p,i)=>i?c.lineTo(p[0],p[1]):c.moveTo(p[0],p[1]));c.closePath();if(pass===0){c.fillStyle='hsl('+(20+face.j*8+face.i*.5)+' 65% '+(40+face.depth*5+face.j%5*3)+'%)';c.fill();c.strokeStyle=c.fillStyle;c.lineWidth=.5;c.stroke();}else{c.fillStyle='#101827';c.fill();c.strokeStyle='hsl('+(165+face.j*3)+' 70% '+(48+face.depth*5)+'%)';c.lineWidth=.85;c.stroke();}}}
const mode=value('pass');ctx.clearRect(0,0,W,H);ctx.drawImage(targets[mode==='wire'?1:0].canvas,0,0);if(mode==='mix'){const masked=targets[2].ctx;masked.clearRect(0,0,W,H);masked.globalCompositeOperation='source-over';masked.drawImage(targets[1].canvas,0,0);masked.globalCompositeOperation='destination-in';const a=number('angle')/180*Math.PI,half=Math.hypot(W,H)/2,gradient=masked.createLinearGradient(W/2-Math.cos(a)*half,H/2-Math.sin(a)*half,W/2+Math.cos(a)*half,H/2+Math.sin(a)*half),p=number('reveal')/100,soft=number('softness')/100*.4;gradient.addColorStop(clamp(p-soft),'white');gradient.addColorStop(clamp(p+soft),'transparent');masked.fillStyle=gradient;masked.fillRect(0,0,W,H);masked.globalCompositeOperation='source-over';ctx.drawImage(targets[2].canvas,0,0);}setText('[data-value="rotation"]',Math.round(number('rotation')));setText('[data-readout]','GEOMETRY / '+(112*12)+' QUADS\nRENDER TARGETS / 2 × '+W+' × '+H+'\nFINAL / '+mode.toUpperCase()+'\nREVEAL / '+number('reveal')+'%');}
install(compositeMaterialPasses);
}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}}
.knot-lab{background:#101827}
@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-72b32cb70de2",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 {canvas,ctx,width:W,height:H}=canvas2D('[data-knot]');
const targets=Array.from({length:3},()=>{const c=document.createElement('canvas');c.width=W;c.height=H;return {canvas:c,ctx:c.getContext('2d')};});
const subtract=(a,b)=>a.map((v,i)=>v-b[i]),cross=(a,b)=>[a[1]*b[2]-a[2]*b[1],a[2]*b[0]-a[0]*b[2],a[0]*b[1]-a[1]*b[0]],unit=a=>{const n=Math.hypot(...a)||1;return a.map(v=>v/n);};
function knotPoint(t){return [(2+.65*Math.cos(t*3))*Math.cos(t*2),(2+.65*Math.cos(t*3))*Math.sin(t*2),.95*Math.sin(t*3)];}
const mesh=[];for(let i=0;i<=112;i++){const t=i/112*Math.PI*2,p=knotPoint(t),tangent=unit(subtract(knotPoint(t+.001),p)),reference=Math.abs(tangent[2])>.93?[0,1,0]:[0,0,1],n=unit(cross(tangent,reference)),b=cross(tangent,n),ring=[];for(let j=0;j<12;j++){const a=j/12*Math.PI*2;ring.push(p.map((v,k)=>v+.43*(Math.cos(a)*n[k]+Math.sin(a)*b[k])));}mesh.push(ring);}
function projectKnot(p,angle){const x=p[0]*Math.cos(angle)+p[2]*Math.sin(angle),z=-p[0]*Math.sin(angle)+p[2]*Math.cos(angle),y=p[1]*.78-z*.62,depth=p[1]*.62+z*.78,scale=105*8/(8-depth);return [W/2+x*scale,H/2+y*scale,depth];}
function compositeMaterialPasses(dt){if(dt){$('[data-control="rotation"]').value=String((number('rotation')+dt*18)%360);}const angle=number('rotation')/180*Math.PI,points=mesh.map(ring=>ring.map(p=>projectKnot(p,angle))),faces=[];for(let i=0;i<112;i++)for(let j=0;j<12;j++){const vertices=[points[i][j],points[i+1][j],points[i+1][(j+1)%12],points[i][(j+1)%12]];faces.push({vertices,depth:vertices.reduce((s,p)=>s+p[2],0)/4,i,j});}faces.sort((a,b)=>a.depth-b.depth);
for(let pass=0;pass<2;pass++){const c=targets[pass].ctx;c.clearRect(0,0,W,H);c.fillStyle='#101827';c.fillRect(0,0,W,H);for(const face of faces){c.beginPath();face.vertices.forEach((p,i)=>i?c.lineTo(p[0],p[1]):c.moveTo(p[0],p[1]));c.closePath();if(pass===0){c.fillStyle='hsl('+(20+face.j*8+face.i*.5)+' 65% '+(40+face.depth*5+face.j%5*3)+'%)';c.fill();c.strokeStyle=c.fillStyle;c.lineWidth=.5;c.stroke();}else{c.fillStyle='#101827';c.fill();c.strokeStyle='hsl('+(165+face.j*3)+' 70% '+(48+face.depth*5)+'%)';c.lineWidth=.85;c.stroke();}}}
const mode=value('pass');ctx.clearRect(0,0,W,H);ctx.drawImage(targets[mode==='wire'?1:0].canvas,0,0);if(mode==='mix'){const masked=targets[2].ctx;masked.clearRect(0,0,W,H);masked.globalCompositeOperation='source-over';masked.drawImage(targets[1].canvas,0,0);masked.globalCompositeOperation='destination-in';const a=number('angle')/180*Math.PI,half=Math.hypot(W,H)/2,gradient=masked.createLinearGradient(W/2-Math.cos(a)*half,H/2-Math.sin(a)*half,W/2+Math.cos(a)*half,H/2+Math.sin(a)*half),p=number('reveal')/100,soft=number('softness')/100*.4;gradient.addColorStop(clamp(p-soft),'white');gradient.addColorStop(clamp(p+soft),'transparent');masked.fillStyle=gradient;masked.fillRect(0,0,W,H);masked.globalCompositeOperation='source-over';ctx.drawImage(targets[2].canvas,0,0);}setText('[data-value="rotation"]',Math.round(number('rotation')));setText('[data-readout]','GEOMETRY / '+(112*12)+' QUADS\nRENDER TARGETS / 2 × '+W+' × '+H+'\nFINAL / '+mode.toUpperCase()+'\nREVEAL / '+number('reveal')+'%');}
install(compositeMaterialPasses);
}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
# One object. Two truths.
Independent article case study. Domain: website consumer / Design Engineering presentation.
An independently generated torus knot is projected once into two offscreen 2D render targets. Solid and wire passes share geometry and camera; a directional alpha mask composites their outputs. This browser-canvas study isolates the article’s render-target principle without claiming its Three.js shader implementation.
## Attribution and evidence
Studied: [Building a Blended Material Shader in WebGL with Solid.js](https://tympanus.net/codrops/2025/08/12/building-a-blended-material-shader-in-webgl-with-solid-js/), Nathan Nye. Article SHA-256: b61727f2cb40c16e62f8ee70023579bfcf02a78ae10b92fdef171b034d6bfd08. Analysis SHA-256: 30c7e798dd280ca590e848daeaefe409af3aa431c912a431a584796be9436821. Source revision: da99d4998c41326e680df816e3a29f6a5c29237a3017047b0221bac4d5a9b772. 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. The cached Visit snapshot is the Blackbird showcase. The exact article-linked StackBlitz tutorial source was not acquired and no grant for republishing the showcase was established; 17 tutorial code fragments remain usable for analysis.
No original article prose, code, artwork, source project or screenshot is distributed here. The authored-code MIT notice applies only to the independent implementation. Uses independently authored Canvas 2D render targets and a compositing mask rather than the original Three.js project. No original source or assets are included.
## Initial state and controls
A knotted surface is drawn twice: once as a lit solid and once as a line network. A soft moving mask decides which rendering reaches the final image.
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 | 53 |
| angle | 12 |
| softness | 25 |
| rotation | 25 |
| pass | mix |
## 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-72b32cb70de2-article-0",
"source": "motion/rendering-and-performance.md",
"anchor": "a-diagnostic-sequence",
"sourceSha256": "1523fdeaa290fa064c4db17d36040de3f35ad39bb18a37517ceb5995f97d1dfd",
"title": "03 / Material passes & compositing · compositeMaterialPasses",
"principle": "Two separately inspectable material targets isolate the compositing mask from the underlying projected geometry.",
"application": "An independently generated torus knot is projected once into two offscreen 2D render targets. Solid and wire passes share geometry and camera; a directional alpha mask composites their outputs. This browser-canvas study isolates the article’s render-target principle without claiming its Three.js shader implementation. This binding describes the authored study and does not verify the original project.",
"code": [
{
"file": "vendor/codrops-article-studies/records/codrops-72b32cb70de2/script.js",
"symbol": "compositeMaterialPasses",
"explanation": "The named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles."
}
],
"checks": [
{
"id": "codrops-72b32cb70de2-compositeMaterialPasses",
"action": "Select Solid only, Wire only, and Composite at the same object rotation.",
"expected": "The silhouette remains aligned across outputs; only the material and mask differ."
}
],
"runtime_verified": false
},
{
"id": "codrops-72b32cb70de2-article-1",
"source": "design-engineering/state-management/patterns/derived-state.md",
"anchor": "state-model-and-ownership",
"sourceSha256": "22192b2fbab970a71ec0237221dc2d35c578e59723bc0032c2347f8ef595cd6c",
"title": "03 / Material passes & compositing · projectKnot",
"principle": "Every pass derives its projection from one rotation and the same immutable mesh.",
"application": "An independently generated torus knot is projected once into two offscreen 2D render targets. Solid and wire passes share geometry and camera; a directional alpha mask composites their outputs. This browser-canvas study isolates the article’s render-target principle without claiming its Three.js shader implementation. This binding describes the authored study and does not verify the original project.",
"code": [
{
"file": "vendor/codrops-article-studies/records/codrops-72b32cb70de2/script.js",
"symbol": "projectKnot",
"explanation": "The named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles."
}
],
"checks": [
{
"id": "codrops-72b32cb70de2-projectKnot",
"action": "Set rotation to 90 and reveal to 20, then 80, then 20.",
"expected": "The knot geometry stays fixed and the same reveal value reconstructs the same mask."
}
],
"runtime_verified": false
},
{
"id": "codrops-72b32cb70de2-article-2",
"source": "motion/accessible-motion.md",
"anchor": "preference-changes-during-work",
"sourceSha256": "db0ad692d5bb3103a3cbe13ec08dbe5cf12552aed7ecf2c93b1d7cc0b8a34b8b",
"title": "03 / Material passes & compositing · applyMotionPreference",
"principle": "One effective preference owns CSS and script playback. The initial view is stationary, and manual controls retain the study values.",
"application": "An independently generated torus knot is projected once into two offscreen 2D render targets. Solid and wire passes share geometry and camera; a directional alpha mask composites their outputs. This browser-canvas study isolates the article’s render-target principle without claiming its Three.js shader implementation. This binding describes the authored study and does not verify the original project.",
"code": [
{
"file": "vendor/codrops-article-studies/records/codrops-72b32cb70de2/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-72b32cb70de2-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
03 / Material passes & compositing · compositeMaterialPasses
Two separately inspectable material targets isolate the compositing mask from the underlying projected geometry.
- 이 예제에서는
- An independently generated torus knot is projected once into two offscreen 2D render targets. Solid and wire passes share geometry and camera; a directional alpha mask composites their outputs. This browser-canvas study isolates the article’s render-target principle without claiming its Three.js shader implementation. This binding describes the authored study and does not verify the original project.
코드와 함께 확인하기
코드에서 찾기
compositeMaterialPassesscript.jsThe named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles.
직접 해보기
Select Solid only, Wire only, and Composite at the same object rotation.
살펴볼 변화The silhouette remains aligned across outputs; only the material and mask differ.
03 / Material passes & compositing · projectKnot
Every pass derives its projection from one rotation and the same immutable mesh.
- 이 예제에서는
- An independently generated torus knot is projected once into two offscreen 2D render targets. Solid and wire passes share geometry and camera; a directional alpha mask composites their outputs. This browser-canvas study isolates the article’s render-target principle without claiming its Three.js shader implementation. This binding describes the authored study and does not verify the original project.
코드와 함께 확인하기
코드에서 찾기
projectKnotscript.jsThe named local function implements this mechanism in the downloadable standalone page; its source hash is listed in codeFiles.
직접 해보기
Set rotation to 90 and reveal to 20, then 80, then 20.
살펴볼 변화The knot geometry stays fixed and the same reveal value reconstructs the same mask.
03 / Material passes & compositing · applyMotionPreference
One effective preference owns CSS and script playback. The initial view is stationary, and manual controls retain the study values.
- 이 예제에서는
- An independently generated torus knot is projected once into two offscreen 2D render targets. Solid and wire passes share geometry and camera; a directional alpha mask composites their outputs. This browser-canvas study isolates the article’s render-target principle without claiming its Three.js shader implementation. 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.