{"job_id":"anim-job-53197cb5-01bd-4b56-adee-a3ad2e59d925","request_id":"bulk-2026-05-20T10-21-44-856Z-16-physics.11.kinematics.relative-motion","status":"complete","asset":{"primary_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-53197cb5-01bd-4b56-adee-a3ad2e59d925/walkthrough.mp4","thumbnail_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-53197cb5-01bd-4b56-adee-a3ad2e59d925/thumb.jpg","transcript_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-53197cb5-01bd-4b56-adee-a3ad2e59d925/transcript.vtt","interactive_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-53197cb5-01bd-4b56-adee-a3ad2e59d925/index.html","scenefile_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-53197cb5-01bd-4b56-adee-a3ad2e59d925/scene-source.json","duration_seconds":15,"byte_size":463234,"renderer":"html_three_js_local","parameters":{"style":"auto","executor":"native_render_executor","localPath":"/app/storage/assets/anim-job-53197cb5-01bd-4b56-adee-a3ad2e59d925","interactivity":"none","renderer_style":"three_js","durationSeconds":15,"render_manifest":{"jobId":"anim-job-53197cb5-01bd-4b56-adee-a3ad2e59d925","request":{"gap":{"topic":"kinematics-relative_motion","severity":"moderate","error_type":"concept_misunderstanding","memory_state":"fragile","display_topic":"Relative Motion","common_wrong_answer":"The concept works the same way in all conditions.","confidence_at_error":"high","correct_understanding":"The concept depends on constraints, assumptions, and variable relationships."},"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":"Kinematics","ncert_class":11},"sub_topics":[{"topic":"kinematics-relative_motion","key_concepts":["Relative Motion","Kinematics"]}]},"metadata":{"priority":"normal","trace_id":"bulk-run-2026-05-20T10-21-44-856Z"},"exam_type":"neet","asset_type":"simulation","request_id":"bulk-2026-05-20T10-21-44-856Z-16-physics.11.kinematics.relative-motion","subject_area":"physics"},"renderer":"html_three_js_local","storyboard":{"beats":[{"label":"Topic","visual":"Show the topic title and the key physical context.","narration":"Relative Motion"},{"label":"Mistake","visual":"Show the wrong approach and why it seems plausible.","narration":"The concept works the same way in all conditions."},{"label":"Correction","visual":"Show the right approach step by step.","narration":"The concept depends on constraints, assumptions, and variable relationships."},{"label":"Concept","visual":"Highlight the key formula and the governing relationship.","narration":"Relative Motion. Kinematics"}],"title":"Relative Motion","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>Relative Motion: Context Matters</title>\n  <style>\n    :root{--bg:#0e121a;--panel:#1c232e;--line:#303449;--accent:#fc884f;--text:#faf9f8;--muted:#9f9ea1;--blue:#627da5;--green:#8decb0;--red:#df8279;}\n    *{box-sizing:border-box;}\n    body{margin:0;font-family:\"Plus Jakarta Sans\",\"Manrope\",\"Inter\",ui-sans-serif,system-ui,sans-serif;background:radial-gradient(120% 90% at 20% -5%,#1c232e 0%,#0e121a 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(28,35,46,.86),rgba(14,18,26,.94));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 rgba(255,255,255,.03);}\n    .stage::before{content:\"\";position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,255,255,.06),transparent 34%);pointer-events:none;}\n    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id=\"v-frame\">Ground</strong></span><input id=\"c-frame\" type=\"range\" min=\"0\" max=\"1\" step=\"1\" value=\"0\"/></label>\n    <ul>\n      <li>❌ <strong>Misconception:</strong> Motion is the same from all perspectives</li>\n      <li>✓ <strong>Truth:</strong> Velocity changes with the observer's reference frame</li>\n      <li>🔑 <strong>Key:</strong> v_rel depends on frame constraints & relative positions</li>\n    </ul>\n  </aside>\n  <section>\n    <div class=\"stage\" id=\"stage\">\n      <div class=\"legend\" id=\"legend\">Ground Frame</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 = [\n  {\"key\":\"obsSpeed\",\"label\":\"Observer Speed\",\"min\":0,\"max\":8,\"step\":0.5,\"value\":2,\"units\":\"m/s\"},\n  {\"key\":\"objSpeed\",\"label\":\"Object Speed\",\"min\":1,\"max\":10,\"step\":0.5,\"value\":5,\"units\":\"m/s\"},\n  {\"key\":\"frame\",\"label\":\"Frame\",\"min\":0,\"max\":1,\"step\":1,\"value\":0,\"units\":\"\"}\n];\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',()=>{\n    if(c.key==='frame'){out.textContent=inp.value==='0'?'Ground':'Observer';}\n    else{out.textContent=inp.value;}\n    window.updateModel?.();\n  });\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  \n  let lastTs=0;\n  let phase=0;\n  let objTrail=[];\n  let relTrail=[];\n  let obsTrail=[];\n  \n  function glowDot(x,y,r,color,a){\n    const g=ctx.createRadialGradient(x,y,0,x,y,r*2.6);\n    const c1=color.replace('ALPHA',String(a));\n    const c2=color.replace('ALPHA','0');\n    g.addColorStop(0,c1);\n    g.addColorStop(1,c2);\n    ctx.fillStyle=g;ctx.beginPath();ctx.arc(x,y,r*2.6,0,Math.PI*2);ctx.fill();\n  }\n  \n  function trail(points,color,width){\n    if(points.length<2)return;\n    ctx.strokeStyle=color;ctx.lineWidth=width;ctx.globalAlpha=0.4;\n    ctx.beginPath();ctx.moveTo(points[0].x,points[0].y);\n    for(let i=1;i<points.length;i++)ctx.lineTo(points[i].x,points[i].y);\n    ctx.stroke();ctx.globalAlpha=1;\n  }\n  \n  function arrow(x1,y1,x2,y2,color,wd){\n    const dx=x2-x1,dy=y2-y1,l=Math.sqrt(dx*dx+dy*dy);\n    if(l<2)return;\n    const nx=dx/l,ny=dy/l,s=12;\n    ctx.strokeStyle=color;ctx.lineWidth=wd||2;\n    ctx.beginPath();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*0.5*ny,y2-s*ny-s*0.5*nx);\n    ctx.lineTo(x2-s*nx-s*0.5*ny,y2-s*ny+s*0.5*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    const obsSpeed=Number(document.getElementById('c-obsSpeed').value);\n    const objSpeed=Number(document.getElementById('c-objSpeed').value);\n    const frameMode=Number(document.getElementById('c-frame').value);\n    \n    phase+=(objSpeed*0.3)*dt;\n    \n    const objX=150+phase*W*0.35;\n    const obsX=100+obsSpeed*dt*W*0.35*phase;\n    \n    const objXWrapped=(objX%W+W)%W;\n    const obsXWrapped=(obsX%W+W)%W;\n    \n    if(objTrail.length===0||Math.abs(objX-objTrail[objTrail.length-1].x)>2){\n      objTrail.push({x:objXWrapped,y:H*0.35});\n      if(objTrail.length>80)objTrail.shift();\n    }\n    if(obsTrail.length===0||Math.abs(obsX-obsTrail[obsTrail.length-1].x)>2){\n      obsTrail.push({x:obsXWrapped,y:H*0.65});\n      if(obsTrail.length>80)obsTrail.shift();\n    }\n    \n    const relV=objSpeed-obsSpeed;\n    if(relTrail.length===0||phase*dt>0.01){\n      relTrail.push({x:W*0.5+relV*20*phase,y:H*0.5});\n      if(relTrail.length>60)relTrail.shift();\n    }\n    \n    ctx.clearRect(0,0,W,H);\n    \n    // Background grid\n    ctx.strokeStyle='rgba(48,52,73,0.3)';ctx.lineWidth=1;\n    for(let i=0;i<=5;i++){\n      const y=H*0.2+i*H*0.15;\n      ctx.beginPath();ctx.moveTo(0,y);ctx.lineTo(W,y);ctx.stroke();\n    }\n    \n    // === GROUND FRAME ===\n    if(frameMode===0){\n      ctx.fillStyle='rgba(98,125,165,0.15)';ctx.fillRect(0,H*0.08,W,H*0.08);\n      ctx.fillStyle='var(--muted)';ctx.font=Math.round(H*0.03)+'px sans-serif';\n      ctx.fillText('GROUND FRAME (static)',W*0.02,H*0.12);\n      \n      // Ground line\n      ctx.strokeStyle='var(--line)';ctx.lineWidth=2;\n      ctx.beginPath();ctx.moveTo(0,H*0.82);ctx.lineTo(W,H*0.82);ctx.stroke();\n      \n      // Observer (stationary reference)\n      ctx.fillStyle='var(--blue)';\n      ctx.beginPath();ctx.arc(obsXWrapped,H*0.65,12,0,Math.PI*2);ctx.fill();\n      glowDot(obsXWrapped,H*0.65,12,'rgba(98,125,165,ALPHA)',0.5);\n      \n      // Object (moving)\n      ctx.fillStyle='var(--accent)';\n      ctx.beginPath();ctx.arc(objXWrapped,H*0.35,14,0,Math.PI*2);ctx.fill();\n      glowDot(objXWrapped,H*0.35,14,'rgba(252,136,79,ALPHA)',0.6);\n      trail(objTrail,'var(--accent)',2);\n      \n      // Velocity vectors\n      arrow(objXWrapped,H*0.35,objXWrapped+objSpeed*25,H*0.35,'var(--green)',2.5);\n      ctx.fillStyle='var(--green)';ctx.font=Math.round(H*0.027)+'px sans-serif';\n      ctx.fillText('v='+objSpeed.toFixed(1)+' m/s',objXWrapped+objSpeed*25+8,H*0.32);\n      \n      arrow(obsXWrapped,H*0.65,obsXWrapped+obsSpeed*25,H*0.65,'var(--red)',2);\n      ctx.fillStyle='var(--red)';\n      ctx.fillText('v='+obsSpeed.toFixed(1)+' m/s',obsXWrapped+obsSpeed*25+8,H*0.62);\n      \n      // Relative velocity annotation\n      ctx.fillStyle='rgba(252,136,79,0.4)';ctx.fillRect(W*0.5-100,H*0.48,200,60);\n      ctx.fillStyle='var(--accent)';ctx.font='bold '+Math.round(H*0.035)+'px sans-serif';\n      ctx.fillText('Relative v = '+relV.toFixed(1)+' m/s',W*0.5-90,H*0.62);\n      ctx.font=Math.round(H*0.025)+'px sans-serif';ctx.fillStyle='var(--muted)';\n      ctx.fillText('(from ground)',W*0.5-90,H*0.72);\n      \n    }else{\n      // === OBSERVER FRAME ===\n      ctx.fillStyle='rgba(181,103,69,0.15)';ctx.fillRect(0,H*0.08,W,H*0.08);\n      ctx.fillStyle='var(--muted)';ctx.font=Math.round(H*0.03)+'px sans-serif';\n      ctx.fillText('OBSERVER FRAME (moving)',W*0.02,H*0.12);\n      \n      // Observer at center (stationary in own frame)\n      ctx.fillStyle='var(--blue)';\n      ctx.beginPath();ctx.arc(W*0.35,H*0.65,12,0,Math.PI*2);ctx.fill();\n      glowDot(W*0.35,H*0.65,12,'rgba(98,125,165,ALPHA)',0.5);\n      ctx.fillStyle='var(--muted)';ctx.font=Math.round(H*0.024)+'px sans-serif';\n      ctx.fillText('YOU',W*0.35-12,H*0.745);\n      \n      // Object (relative motion)\n      const relObjX=W*0.5+relV*25*phase;\n      ctx.fillStyle='var(--accent)';\n      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