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    "# File: stack.ipynb\n",
    "# Code: Claude Code and Codex\n",
    "# Review: Ryoichi Ando (ryoichi.ando@zozo.com)\n",
    "# License: Apache v2.0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b187458e-24ce-4d33-8fad-ddd1c248499c",
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   "outputs": [],
   "source": [
    "from frontend import App\n",
    "\n",
    "# create an app\n",
    "app = App.create(\"stack\")\n",
    "\n",
    "# create a square sheet mesh\n",
    "V, F = app.mesh.square(res=128, ex=[1, 0, 0], ey=[0, 0, 1])\n",
    "app.asset.add.tri(\"sheet\", V, F)\n",
    "\n",
    "# create a sphere tetrahedral mesh\n",
    "V, F, T = app.mesh.icosphere(r=0.25, subdiv_count=4).tetrahedralize()\n",
    "app.asset.add.tet(\"sphere\", V, F, T)\n",
    "\n",
    "# create a scene\n",
    "scene = app.scene.create()\n",
    "\n",
    "# add invisible floor\n",
    "scene.add.invisible.wall([0, 0, 0], [0, 1, 0])\n",
    "\n",
    "# add stacked sheets with rotation\n",
    "n, space = 10, 0.05\n",
    "for i in range(n):\n",
    "    y = (i + 1) * space\n",
    "    deg = i * 90 / n\n",
    "    obj = scene.add(\"sheet\")\n",
    "    obj.at(0, y, 0).jitter().rotate(deg, \"y\")\n",
    "    obj.param.set(\"strain-limit\", 0.05).set(\"bend\", 2.5).set(\"friction\", 0.5)\n",
    "\n",
    "# add heavy sphere with downward velocity to crash through sheets\n",
    "sphere = scene.add(\"sphere\").at(0, 1, 0).velocity(0, -5, 0)\n",
    "sphere.param.set(\"density\", 5e4)\n",
    "\n",
    "# compile the scene and report stats\n",
    "scene = scene.build().report()\n",
    "\n",
    "# preview the initial scene\n",
    "scene.preview()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f1dcff97-9d59-4772-acdc-e43ae5142b06",
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   "outputs": [],
   "source": [
    "# create a new session with the compiled scene\n",
    "session = app.session.create(scene)\n",
    "\n",
    "# set session parameters\n",
    "session.param.set(\"frames\", 120).set(\"friction-mode\", \"max\")\n",
    "\n",
    "# build this session\n",
    "session = session.build()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e4e0775f-cb2c-415e-afef-ddecc393adc6",
   "metadata": {},
   "outputs": [],
   "source": [
    "# start the simulation and live-preview the results\n",
    "session.start().preview()\n",
    "\n",
    "# also show simulation logs in realtime\n",
    "session.stream()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "63a8883d-714a-474a-9ee0-0846f2b84365",
   "metadata": {},
   "outputs": [],
   "source": [
    "# create an animation from the simulation results\n",
    "session.animate()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5face31e-4a26-472f-b455-969ec0bc8190",
   "metadata": {},
   "outputs": [],
   "source": [
    "# export the animation to file\n",
    "session.export.animation()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f4615e45-ea8c-434f-9452-c235068fb404",
   "metadata": {},
   "outputs": [],
   "source": [
    "# this is for CI\n",
    "if app.ci:\n",
    "    assert session.finished()"
   ]
  }
 ],
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