{"job_id":"anim-job-46ffb8a6-b825-42a4-a971-f5e915d92b15","request_id":"test-physics-coulomb-fef4a9a4-ee3c-4109-9b59-ca80c158fc36-1778702709883","status":"complete","asset":{"primary_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-46ffb8a6-b825-42a4-a971-f5e915d92b15/walkthrough.mp4","thumbnail_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-46ffb8a6-b825-42a4-a971-f5e915d92b15/thumb.jpg","transcript_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-46ffb8a6-b825-42a4-a971-f5e915d92b15/transcript.vtt","interactive_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-46ffb8a6-b825-42a4-a971-f5e915d92b15/index.html","scenefile_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-46ffb8a6-b825-42a4-a971-f5e915d92b15/scene-source.json","duration_seconds":15,"byte_size":253983,"renderer":"html_three_js_local","parameters":{"style":"auto","executor":"native_render_executor","localPath":"/app/storage/assets/anim-job-46ffb8a6-b825-42a4-a971-f5e915d92b15","control_count":3,"interactivity":"none","simulation_id":"physics.12.electrostatics.coulomb_field_lines","renderer_style":"three_js","durationSeconds":15,"render_manifest":{"jobId":"anim-job-46ffb8a6-b825-42a4-a971-f5e915d92b15","request":{"gap":{"topic":"coulomb-field-lines","severity":"dangerous","error_type":"concept_misunderstanding","memory_state":"fragile","display_topic":"Coulomb 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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 DOES depend on distance—inverse square relationship</p>\n    <p class=\"formula\">F = k·|q₁·q₂|/r²</p>\n    <label class=\"control\"><span>Charge q₁: <strong id=\"v-q1\">5</strong> μC</span><input id=\"c-q1\" type=\"range\" min=\"1\" max=\"10\" step=\"0.5\" value=\"5\"/></label>\n    <label class=\"control\"><span>Charge q₂: <strong id=\"v-q2\">5</strong> μC</span><input id=\"c-q2\" 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>x</span><input id=\"c-speed\" type=\"range\" min=\"0.5\" max=\"2\" step=\"0.1\" value=\"1\"/></label>\n    <ul>\n      <li><strong style=\"color:var(--accent);\">✓ Correct:</strong> Force ∝ 1/r²</li>\n      <li><strong style=\"color:var(--red);\">✗ Mistake:</strong> \"Force is same at any r\"</li>\n      <li>Field WEAKENS rapidly with distance</li>\n      <li>Double distance → 1/4 force</li>\n      <li>Triple distance → 1/9 force</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\":\"q1\",\"label\":\"Charge q₁\",\"min\":1,\"max\":10,\"step\":0.5,\"value\":5,\"units\":\"μC\"},\n  {\"key\":\"q2\",\"label\":\"Charge q₂\",\"min\":1,\"max\":10,\"step\":0.5,\"value\":5,\"units\":\"μC\"},\n  {\"key\":\"speed\",\"label\":\"Animation Speed\",\"min\":0.5,\"max\":2,\"step\":0.1,\"value\":1,\"units\":\"x\"}\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',()=>{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  \n  // State variables\n  let t = 0;\n  let testPoints = [];\n  let fieldStrengthGraph = [];\n  \n  function resetState(){\n    t = 0;\n    testPoints = [];\n    fieldStrengthGraph = [];\n  }\n  \n  function glowDot(x,y,r,color,a){\n    const g=ctx.createRadialGradient(x,y,0,x,y,r*2.6);\n    const rgb = color.includes('rgb') ? color : color;\n    g.addColorStop(0, rgb.replace(')', ', '+a).replace('rgb', 'rgba'));\n    g.addColorStop(1, rgb.replace(')', ', 0').replace('rgb', 'rgba'));\n    ctx.fillStyle=g;\n    ctx.beginPath();\n    ctx.arc(x,y,r*2.6,0,Math.PI*2);\n    ctx.fill();\n  }\n  \n  function arrow(x1,y1,x2,y2,color,width=2){\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=10;\n    ctx.strokeStyle=color;\n    ctx.lineWidth=width;\n    ctx.beginPath();\n    ctx.moveTo(x1,y1);\n    ctx.lineTo(x2,y2);\n    ctx.stroke();\n    ctx.fillStyle=color;\n    ctx.beginPath();\n    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