{"job_id":"anim-job-1b4f1f00-d923-4a5c-bd51-eb4caaff58b3","request_id":"test-physics-shm-fef4a9a4-ee3c-4109-9b59-ca80c158fc36-1778702709883","status":"complete","asset":{"primary_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-1b4f1f00-d923-4a5c-bd51-eb4caaff58b3/walkthrough.mp4","thumbnail_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-1b4f1f00-d923-4a5c-bd51-eb4caaff58b3/thumb.jpg","transcript_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-1b4f1f00-d923-4a5c-bd51-eb4caaff58b3/transcript.vtt","interactive_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-1b4f1f00-d923-4a5c-bd51-eb4caaff58b3/index.html","scenefile_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-1b4f1f00-d923-4a5c-bd51-eb4caaff58b3/scene-source.json","duration_seconds":15,"byte_size":263067,"renderer":"html_three_js_local","parameters":{"style":"auto","executor":"native_render_executor","localPath":"/app/storage/assets/anim-job-1b4f1f00-d923-4a5c-bd51-eb4caaff58b3","interactivity":"none","renderer_style":"three_js","durationSeconds":15,"render_manifest":{"jobId":"anim-job-1b4f1f00-d923-4a5c-bd51-eb4caaff58b3","request":{"gap":{"topic":"shm-restoring-force","severity":"dangerous","error_type":"concept_misunderstanding","memory_state":"fragile","display_topic":"Simple Harmonic Motion — Restoring Force","common_wrong_answer":"The restoring force in SHM is constant regardless of displacement.","confidence_at_error":"high","correct_understanding":"Restoring force is proportional to displacement: F = -kx. Maximum at extremes, zero at mean position."},"target":{"style":"auto","render":{"fps":30,"format":"mp4","resolution":"1920x1080","include_thumbnail":true,"include_transcript":true},"audience":{"tone":"neutral_instructional","grade":"11","language":"en"},"interactivity":"none","duration_seconds":15},"context":{"chapter":{"name":"Oscillations","ncert_class":11,"ncert_chapter_number":14},"sub_topics":[{"topic":"Simple Harmonic Motion","key_concepts":["SHM","restoring force","amplitude","time period"]}]},"metadata":{"priority":"normal"},"exam_type":"neet","asset_type":"simulation","request_id":"test-physics-shm-fef4a9a4-ee3c-4109-9b59-ca80c158fc36-1778702709883","subject_area":"physics"},"renderer":"html_three_js_local","storyboard":{"beats":[{"label":"Topic","visual":"Show the topic title and the key physical context.","narration":"Simple Harmonic Motion — Restoring Force"},{"label":"Mistake","visual":"Show the wrong approach and why it seems plausible.","narration":"The restoring force in SHM is constant regardless of displacement."},{"label":"Correction","visual":"Show the right approach step by step.","narration":"Restoring force is proportional to displacement: F = -kx. Maximum at extremes, zero at mean position."},{"label":"Concept","visual":"Highlight the key formula and the governing relationship.","narration":"SHM. restoring force. amplitude"}],"title":"Simple Harmonic Motion — Restoring Force","sceneCode":"<!doctype html>\n<html lang=\"en\">\n<head>\n  <meta charset=\"utf-8\"/>\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"/>\n  <title>SHM Restoring Force: F = -kx</title>\n  <style>\n    :root{--bg:#0f1418;--panel:#182228;--line:#2e3e46;--accent:#e5ba67;--text:#f4f1ea;--muted:#c8d4da;--blue:#63b3ff;--green:#87e8a8;--red:#de7f76;}\n    *{box-sizing:border-box;}\n    body{margin:0;font-family:\"Plus Jakarta Sans\",\"Manrope\",ui-sans-serif,system-ui,sans-serif;background:radial-gradient(120% 90% at 20% -5%,#24343d 0%,var(--bg) 55%);color:var(--text);}\n    main{min-height:100vh;display:grid;grid-template-columns:minmax(300px,380px) 1fr;}\n    aside{border-right:1px solid var(--line);background:linear-gradient(180deg,rgba(31,46,53,.86),rgba(24,34,40,.92));padding:24px;overflow:auto;backdrop-filter:blur(6px);}\n    section{padding:24px;display:grid;place-items:center;}\n    h1{margin:0 0 10px;font-size:1.65rem;line-height:1.15;}\n    .sub{margin:0 0 16px;color:var(--muted);}\n    .formula{margin:0 0 14px;padding:10px;border:1px solid var(--line);border-radius:10px;background:#11191e;color:var(--accent);font-family:ui-monospace,monospace;font-size:0.9rem;box-shadow:inset 0 0 28px rgba(229,186,103,.08);}\n    .control{display:grid;gap:6px;margin:12px 0;}\n    .control input{width:100%;accent-color:var(--accent);}\n    ul{margin:14px 0 0 18px;padding:0;color:var(--muted);display:grid;gap:6px;}\n    .stage{width:min(1020px,95%);aspect-ratio:16/9;border:1px solid #445862;border-radius:14px;position:relative;overflow:hidden;background:radial-gradient(circle at 50% 38%,#2f4a57,#0f1418 72%);box-shadow:0 18px 60px rgba(0,0,0,.45), inset 0 0 90px 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min=\"1.0\" max=\"6.0\" step=\"0.5\" value=\"3.0\"/></label>\n    <label class=\"control\"><span>Graph Scale: <strong id=\"v-scale\">1.0</strong>x</span><input id=\"c-scale\" type=\"range\" min=\"0.5\" max=\"2.0\" step=\"0.1\" value=\"1.0\"/></label>\n    <ul>\n      <li><strong>Red zone:</strong> Large displacement → large |F|</li>\n      <li><strong>Center:</strong> x=0 → F=0 (zero force)</li>\n      <li><strong>Direction:</strong> Force opposes displacement</li>\n      <li><strong>Myth:</strong> F is constant—<span style=\"color:var(--red)\">FALSE</span></li>\n    </ul>\n  </aside>\n  <section>\n    <div class=\"stage\" id=\"stage\">\n      <div class=\"legend\" id=\"legend\">Ready</div>\n      <canvas id=\"sim-cv\" style=\"position:absolute;inset:0;width:100%;height:100%;\"></canvas>\n    </div>\n  </section>\n</main>\n<script>\nconst controls = [{\"key\":\"k\",\"label\":\"Spring Constant\",\"min\":0.3,\"max\":3.0,\"step\":0.1,\"value\":1.0,\"units\":\"N/m\"},{\"key\":\"a\",\"label\":\"Amplitude\",\"min\":1.0,\"max\":6.0,\"step\":0.5,\"value\":3.0,\"units\":\"cm\"},{\"key\":\"scale\",\"label\":\"Graph Scale\",\"min\":0.5,\"max\":2.0,\"step\":0.1,\"value\":1.0,\"units\":\"x\"}];\nfor(const c of controls){\n  const inp=document.getElementById('c-'+c.key);\n  const out=document.getElementById('v-'+c.key);\n  inp?.addEventListener('input',()=>{out.textContent=inp.value;window.updateModel?.();});\n}\n(function(){\n  const cv=document.getElementById('sim-cv');\n  const ctx=cv.getContext('2d');\n  function resize(){const r=cv.getBoundingClientRect();if(r.width>0){cv.width=r.width;cv.height=r.height;}}\n  resize();new ResizeObserver(resize).observe(cv);\n  let lastTs=0;\n  \n  // State\n  let phase=0;\n  let k=1.0;\n  let A=3.0;\n  let scale=1.0;\n  let forceTrail=[];\n  let maxTrailLen=180;\n  \n  function glowDot(x,y,r,color,a){\n    const g=ctx.createRadialGradient(x,y,0,x,y,r*2.6);\n    g.addColorStop(0,color.replace('ALPHA',String(a)));\n    g.addColorStop(1,color.replace('ALPHA','0'));\n    ctx.fillStyle=g;ctx.beginPath();ctx.arc(x,y,r*2.6,0,Math.PI*2);ctx.fill();\n  }\n  \n  function arrow(x1,y1,x2,y2,color,width=2){\n    const dx=x2-x1,dy=y2-y1,len=Math.sqrt(dx*dx+dy*dy);\n    if(len<1)return;\n    const nx=dx/len,ny=dy/len,s=14;\n    ctx.strokeStyle=color;ctx.lineWidth=width;ctx.beginPath();\n    ctx.moveTo(x1,y1);ctx.lineTo(x2,y2);ctx.stroke();\n    ctx.fillStyle=color;ctx.beginPath();\n    ctx.moveTo(x2,y2);\n    ctx.lineTo(x2-s*nx+s*0.4*ny,y2-s*ny-s*0.4*nx);\n    ctx.lineTo(x2-s*nx-s*0.4*ny,y2-s*ny+s*0.4*nx);\n    ctx.fill();\n  }\n  \n  function tick(ts){\n    const dt=Math.min(0.04,(ts-lastTs)/1000);lastTs=ts;\n    const W=cv.width,H=cv.height;\n    \n    // Read sliders\n    k=parseFloat(document.getElementById('c-k').value);\n    A=parseFloat(document.getElementById('c-a').value);\n    scale=parseFloat(document.getElementById('c-scale').value);\n    \n    // Update physics\n    phase+=(2*Math.PI/4)*dt; // 4 second period\n    if(phase>Math.PI*2)phase-=Math.PI*2;\n    \n    const x=A*Math.cos(phase); // displacement in cm\n    const v=-A*Math.sin(phase)*(2*Math.PI/4); // velocity\n    const F=-k*x; // restoring force F=-kx\n    \n    // Store force for graph\n    forceTrail.push({t:phase,f:F});\n    if(forceTrail.length>maxTrailLen)forceTrail.shift();\n    \n    // Clear\n    ctx.clearRect(0,0,W,H);\n    ctx.fillStyle='#0f1418';ctx.fillRect(0,0,W,H);\n    \n    // Background grid\n    ctx.strokeStyle='rgba(78,102,114,0.15)';ctx.lineWidth=1;\n    for(let i=0;i<W;i+=40){ctx.beginPath();ctx.moveTo(i,0);ctx.lineTo(i,H);ctx.stroke();}\n    for(let i=0;i<H;i+=40){ctx.beginPath();ctx.moveTo(0,i);ctx.lineTo(W,i);ctx.stroke();}\n    \n    // ===== LEFT PANEL: Mass-Spring System =====\n    const springX=W*0.16;\n    const springY=H*0.35;\n    \n    // Spring anchor\n    ctx.fillStyle='#445862';\n    ctx.fillRect(springX-20,springY-8,12,16);\n    \n    // Spring coils\n    const coilSpacing=2;\n    const coilCount=12;\n    const springLen=80;\n    const displacement=x*10; // scale to pixels\n    ctx.strokeStyle='#87e8a8';ctx.lineWidth=3;\n    ctx.beginPath();\n    ctx.moveTo(springX-8,springY);\n    for(let i=0;i<coilCount;i++){\n      const px=springX-8+i*(springLen-displacement)/coilCount;\n      const py=springY+(i%2===0?-4:4);\n      ctx.lineTo(px,py);\n    }\n    ctx.lineTo(springX-8+springLen-displacement,springY);\n    ctx.stroke();\n    \n    // Mass (box)\n    const massX=springX-8+springLen-displacement;\n    const massSize=16;\n    ctx.fillStyle=F>0?'#de7f76':'#63b3ff';\n    ctx.fillRect(massX-massSize/2,springY-massSize/2,massSize,massSize);\n    ctx.strokeStyle='rgba(255,255,255,0.3)';ctx.lineWidth=1;\n    ctx.strokeRect(massX-massSize/2,springY-massSize/2,massSize,massSize);\n    \n    // Glow around mass (intensity based on force magnitude)\n    const glowIntensity=Math.min(0.8,Math.abs(F)/5);\n    const forceColor=F>0?'rgba(222,127,118,ALPHA)':'rgba(99,179,255,ALPHA)';\n    glowDot(massX,springY,massSize*0.7,forceColor,glowIntensity*0.6);\n    \n    // Displacement label\n    ctx.fillStyle='var(--muted)';ctx.font=Math.round(H*0.035)+'px sans-serif';\n    ctx.textAlign='center';\n    ctx.fillText('x = '+x.toFixed(2)+' cm',springX,springY+50);\n    \n    // ===== CENTER: Force Vector =====\n    const forceGraphX=W*0.5;\n    const forceGraphY=H*0.3;\n    \n    // Draw force vector arrow\n    const forceScale=20;\n    const forceVecLen=F*forceScale;\n    const arrowColor=F<0?'#de7f76':'#63b3ff';\n    arrow(forceGraphX,forceGraphY,forceGraphX+forceVecLen,forceGraphY,arrowColor,3);\n    \n    // Force label\n    ctx.fillStyle='var(--accent)';ctx.font=Math.round(H*0.04)+'px sans-serif';\n    ctx.textAlign='center';\n    ctx.fillText('F = −kx',forceGraphX,forceGraphY-35);\n    ctx.fillStyle='var(--muted)';ctx.font=Math.round(H*0.032)+'px sans-serif';\n    ctx.fillText('F = '+F.toFixed(2)+' N',forceGraphX,forceGraphY+45);\n    \n    // ===== RIGHT PANEL: Force vs Displacement Graph =====\n    const graphX=W*0.75;\n    const graphY=H*0.5;\n    const graphW=120;\n    const graphH=100;\n    \n    // Graph frame\n    ctx.strokeStyle='#445862';ctx.lineWidth=1;\n    ctx.strokeRect(graphX-graphW/2,graphY-graphH/2,graphW,graphH);\n    \n    // Axes\n    ctx.strokeStyle='#c8d4da';ctx.lineWidth=1.5;\n    ctx.beginPath();ctx.moveTo(graphX-graphW/2+10,graphY);ctx.lineTo(graphX+graphW/2-10,graphY);ctx.stroke(); // x-axis\n    ctx.beginPath();ctx.moveTo(graphX,graphY-graphH/2+10);ctx.lineTo(graphX,graphY+graphH/2-10);ctx.stroke(); // y-axis\n    \n    // Draw F vs x line (theoretical)\n    ctx.strokeStyle='rgba(99,179,255,0.4)';ctx.lineWidth=2;ctx.beginPath();\n    for(let ix=-A;ix<=A;ix+=0.1){\n      const fval=-k*ix;\n      const px=graphX+(ix/(A*1.2))*graphW/2;\n      const py=graphY-(fval/(k*A*1.2))*graphH/2*scale;\n      if(ix===-A)ctx.moveTo(px,py);else ctx.lineTo(px,py);\n    }\n    ctx.stroke();\n    \n    // Current point on graph\n    const px_curr=graphX+(x/(A*1.2))*graphW/2;\n    const py_curr=graphY-(F/(k*A*1.2))*graphH/2*scale;\n    ctx.fillStyle='#e5ba67';\n    ctx.beginPath();ctx.arc(px_curr,py_curr,5,0,Math.PI*2);ctx.fill();\n    glowDot(px_curr,py_curr,4,'rgba(229,186,103,ALPHA)',0.5);\n    \n    // Labels\n    ctx.fillStyle='var(--muted)';ctx.font=Math.round(H*0.025)+'px sans-serif';\n    ctx.textAlign='center';\n    ctx.fillText('Displacement (cm)',graphX,graphY+graphH/2+20);\n    ctx.textAlign='right';\n    ctx.fillText('Force (N)',graphX-graphW/2-15,graphY-graphH/2-5);\n    \n    // ===== BOTTOM: Myth vs Truth =====\n    const mythY","remediationGoal":"Close concept_misunderstanding for physics."},"rendererStyle":"three_js"}}},"metadata":{"rendered_at":"2026-05-13T20:15:52.498Z","cache_hit":false,"cost_usd":0},"error":null}