{"job_id":"anim-job-a9fc46eb-1af2-4270-a8f1-e6f4cc57ed3f","request_id":"test-physics-coulomb-ba30c5e5-e5bb-4ff3-90a7-a40b2e480a51-1778708287067","status":"complete","asset":{"primary_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-a9fc46eb-1af2-4270-a8f1-e6f4cc57ed3f/walkthrough.mp4","thumbnail_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-a9fc46eb-1af2-4270-a8f1-e6f4cc57ed3f/thumb.jpg","transcript_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-a9fc46eb-1af2-4270-a8f1-e6f4cc57ed3f/transcript.vtt","interactive_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-a9fc46eb-1af2-4270-a8f1-e6f4cc57ed3f/index.html","scenefile_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-a9fc46eb-1af2-4270-a8f1-e6f4cc57ed3f/scene-source.json","duration_seconds":15,"byte_size":456739,"renderer":"html_three_js_local","parameters":{"style":"auto","executor":"native_render_executor","localPath":"/app/storage/assets/anim-job-a9fc46eb-1af2-4270-a8f1-e6f4cc57ed3f","control_count":3,"interactivity":"none","simulation_id":"physics.12.electrostatics.coulomb_field_lines","renderer_style":"three_js","durationSeconds":15,"render_manifest":{"jobId":"anim-job-a9fc46eb-1af2-4270-a8f1-e6f4cc57ed3f","request":{"gap":{"topic":"coulomb-field-lines","severity":"dangerous","error_type":"concept_misunderstanding","memory_state":"fragile","display_topic":"Coulomb Law Field Lines","common_wrong_answer":"Field strength does not change with distance.","confidence_at_error":"high","correct_understanding":"Coulomb force scales with charge product and inverse square of distance."},"target":{"style":"auto","render":{"fps":30,"format":"mp4","resolution":"1920x1080","include_thumbnail":true,"include_transcript":true},"audience":{"tone":"neutral_instructional","grade":"12","language":"en"},"interactivity":"none","duration_seconds":15},"context":{"chapter":{"name":"Electrostatics","ncert_class":12,"ncert_chapter_number":1},"sub_topics":[{"topic":"Coulomb Law","key_concepts":["Coulomb","field lines"]}]},"metadata":{"priority":"normal"},"exam_type":"neet","asset_type":"simulation","request_id":"test-physics-coulomb-ba30c5e5-e5bb-4ff3-90a7-a40b2e480a51-1778708287067","subject_area":"physics"},"renderer":"html_three_js_local","storyboard":{"beats":[{"label":"Topic","visual":"Show the topic title and the key physical context.","narration":"Coulomb Law Field Lines"},{"label":"Mistake","visual":"Show the wrong approach and why it seems plausible.","narration":"Field strength does not change with distance."},{"label":"Correction","visual":"Show the right approach step by step.","narration":"Coulomb force scales with charge product and inverse square of distance."},{"label":"Concept","visual":"Highlight the key formula and the governing relationship.","narration":"Coulomb. field lines"}],"title":"Coulomb Law Field Lines","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>Coulomb's Law: Field Strength & Distance</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 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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    .legend{position:absolute;right:12px;top:12px;padding:8px 10px;border-radius:10px;border:1px solid #465a64;background:rgba(9,14,18,.58);font-size:0.8rem;color:var(--muted);backdrop-filter:blur(4px);}\n    @media(max-width:900px){main{grid-template-columns:1fr;}aside{border-right:0;border-bottom:1px solid var(--line);}}\n  </style>\n</head>\n<body>\n<main>\n  <aside>\n    <h1>Coulomb's Law</h1>\n    <p class=\"sub\">Field strength depends on distance — not constant!</p>\n    <p class=\"formula\">E = k|Q|/r²</p>\n    <label class=\"control\"><span>Source Charge: <strong id=\"v-charge\">5</strong> µC</span><input id=\"c-charge\" type=\"range\" min=\"1\" max=\"10\" step=\"0.5\" value=\"5\"/></label>\n    <label class=\"control\"><span>Animation Speed: <strong id=\"v-speed\">1</strong>×</span><input id=\"c-speed\" type=\"range\" min=\"0.3\" max=\"2\" step=\"0.1\" value=\"1\"/></label>\n    <label class=\"control\"><span>Show Distance Grid: <strong id=\"v-grid\">ON</strong></span><input id=\"c-grid\" type=\"range\" min=\"0\" max=\"1\" step=\"1\" value=\"1\"/></label>\n    <ul>\n      <li><strong>❌ Misconception:</strong> Field strength stays the same everywhere.</li>\n      <li><strong>✓ Truth:</strong> Inverse square law—field halves at 2× distance.</li>\n      <li><strong>Why:</strong> Field lines spread over larger sphere: 4πr².</li>\n      <li><strong>Action:</strong> Watch the test charge accelerate less as r increases.</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 = [\n  {\"key\":\"charge\",\"label\":\"Source Charge\",\"min\":1,\"max\":10,\"step\":0.5,\"value\":5,\"units\":\"µC\"},\n  {\"key\":\"speed\",\"label\":\"Animation Speed\",\"min\":0.3,\"max\":2,\"step\":0.1,\"value\":1,\"units\":\"×\"},\n  {\"key\":\"grid\",\"label\":\"Show Distance Grid\",\"min\":0,\"max\":1,\"step\":1,\"value\":1,\"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==='grid')out.textContent=inp.value==='1'?'ON':'OFF';\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  let lastTs=0;\n  \n  // Physics state\n  let state={\n    testCharges:[],\n    time:0,\n    sourceX:0,\n    sourceY:0,\n    elapsedSec:0,\n    cyclePhase:0\n  };\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',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){\n    const dx=x2-x1,dy=y2-y1,l=Math.sqrt(dx*dx+dy*dy);\n    if(l<3)return;\n    const nx=dx/l,ny=dy/l,s=10;\n    ctx.strokeStyle=color;ctx.lineWidth=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*0.4*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 fieldStrengthAtDistance(Q,r){\n    // E = k|Q|/r^2, normalized\n    if(r<10)r=10;\n    return Q/(r*r)*40000;\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    const Q=Number(document.getElementById('c-charge').value);\n    const speed=Number(document.getElementById('c-speed').value);\n    const showGrid=Number(document.getElementById('c-grid').value)>0.5;\n    \n    // Update state\n    state.elapsedSec+=dt*speed;\n    state.cyclePhase=(state.elapsedSec%20)/20; // 20-second cycle\n    state.sourceX=W*0.25;\n    state.sourceY=H*0.5;\n    \n    // Initialize or update test charges at discrete rings\n    if(state.testCharges.length===0){\n      for(let i=0;i<5;i++){\n        state.testCharges.push({\n          ring:i+1,\n          angle:Math.random()*Math.PI*2,\n          baseRadius:40+i*35,\n          pos:{x:0,y:0},\n          accel:0\n        });\n      }\n    }\n    \n    // Update test charge dynamics\n    for(const tc of state.testCharges){\n      const r=tc.baseRadius;\n      const E=fieldStrengthAtDistance(Q,r);\n      tc.accel=E*dt*0.08; // smooth acceleration damping\n      tc.angle+=(tc.accel)*0.3*dt;\n      tc.pos.x=state.sourceX+r*Math.cos(tc.angle);\n      tc.pos.y=state.sourceY+r*Math.sin(tc.angle);\n    }\n    \n    // Clear canvas\n    ctx.clearRect(0,0,W,H);\n    \n    // Draw distance grid/rings\n    if(showGrid){\n      ctx.strokeStyle='rgba(99,179,255,0.15)';\n      ctx.lineWidth=1;\n      ctx.setLineDash([4,4]);\n      for(let i=1;i<=5;i++){\n        const r=40+i*35;\n        ctx.beginPath();ctx.arc(state.sourceX,state.sourceY,r,0,Math.PI*2);\n        ctx.stroke();\n      }\n      ctx.setLineDash([]);\n      // Labels for distances\n      ctx.fillStyle='rgba(200,212,218,0.5)';\n      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ctx.fillText('+',state.sourceX,state.sourceY);\n    \n    // Draw test charges + force vectors\n    for(let i=0;i<state.testCharges.length;i++){\n      const tc=state.testCharges[i];\n      const r=tc.baseRadius;\n      const E=fieldStrengthAtDistance(Q,r);\n      const intensity=Math.min(1,E/100);\n      \n      // Radial direction (outward from source)\n      const dx=tc.pos.x-state.sourceX;\n      const dy=tc.pos.y-state.sourceY;\n      const dist=Math.sqrt(dx*dx+dy*dy);\n      const nx=dist>0?dx/dist:1;\n      const ny=dist>0?dy/dist:0;\n      \n      // Test charge glow\n      const glowCol=`rgba(135,232,168,ALPHA)`;\n      glowDot(tc.pos.x,tc.pos.y,8,glowCol,0.7*intensity);\n      ctx.fillStyle=`rgba(135,232,168,${0.5+0.5*intensity})`;\n      ctx.beginPath();ctx.arc(tc.pos.x,tc.pos.y,6,0,Math.PI*2);ctx.fill();\n      \n      // Force arrow (magnitude and color code inversely with distance)\n      const forceLen=Math.max(5,E*0.4);\n      const 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