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       "require.undef(\"nbextensions/vpython_libraries/glow.min\");"
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       "require([\"nbextensions/vpython_libraries/glow.min\"], function(){console.log(\"GLOW LOADED\");})"
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   "source": [
    "from vpython import *\n",
    "scene.background = color.gray(0.8)\n",
    "scene.forward = vec(0,-0.2,-1)\n",
    "scene.fov = 0.2\n",
    "scene.range = 3.8\n",
    "scene.caption = \"\"\"Right button drag or Ctrl-drag to rotate \"camera\" to view scene.\n",
    "To zoom, drag with middle button or Alt/Option depressed, or use scroll wheel.\n",
    "     On a two-button mouse, middle is left + right.\n",
    "Touch screen: pinch/extend to zoom, swipe or two-finger rotate.\\n\"\"\"\n",
    "\n",
    "E1 = extrusion(path=[vec(0,0,0), vec(0,0,-0.7)], texture=textures.wood_old,\n",
    "    shape=[ shapes.circle(radius=1.5),\n",
    "            shapes.triangle(pos=[0,-0.6], length=1.2),\n",
    "            shapes.trapezoid(pos=[0,0.6], width=1.6,\n",
    "              height=1, top=0.6) ], pos=vec(-4,1.5,0))\n",
    "\n",
    "copper = vec(0.722,0.451,0.200)\n",
    "E2 = extrusion(path=paths.arc(radius=1.7, angle2=pi), texture=textures.metal, \n",
    "    shape=[ [shapes.triangle(length=2), shapes.circle(pos=[0,.5], radius=0.2),\n",
    "    shapes.trapezoid(pos=[0,-0.2],\n",
    "    width=0.6, height=0.4)],\n",
    "    [shapes.rectangle(pos=[0,1.8],\n",
    "    width=1,height=0.3)] ],\n",
    "    start_face_color=copper, end_face_color=copper)\n",
    "E2center = E2.pos    # initial pos of center of extrusion\n",
    "E2.pos = vec(3,2,0)  # new pos of center of extrsion\n",
    "E2rot = E2.pos+vec(0,0,-E2center.z) # a location at the front of the extrusion\n",
    "\n",
    "halo = ring(pos=vec(0,0,1), radius=0.8, thickness=0.2, color=color.cyan )\n",
    "\n",
    "rect = extrusion(path=paths.rectangle(width=5, height=2), \n",
    "            shape=shapes.hexagon(length=0.3), color=color.red)\n",
    "\n",
    "bottom = extrusion(path=paths.cross(width=4, thickness=1),\n",
    "            shape=shapes.circle(radius=0.2), color=color.green)\n",
    "\n",
    "tube = extrusion(path=[vec(0,0,0), vec(2,0,0)], shape=shapes.circle(radius=0.6, thickness=0.2),\n",
    "                    pos=vec(-1,1.7,0), axis=vec(0,0,2), color=color.yellow, end_face_color=color.blue)\n",
    "text(pos=tube.pos+vec(0,0,1), text='tube', align='center',\n",
    "        height=0.25, depth=0, color=color.blue)\n",
    "\n",
    "run = True\n",
    "\n",
    "def runner(r):\n",
    "    global run\n",
    "    run = r.checked\n",
    "    \n",
    "checkbox(bind=runner, text='Run', checked=True)\n",
    "\n",
    "#scene.waitfor('textures')\n",
    "\n",
    "t = 0\n",
    "dt = 0.01\n",
    "dtheta = 0.01\n",
    "while True:\n",
    "    rate(100)\n",
    "    if run:\n",
    "        halo.pos.x = -1+sin(2*t)\n",
    "        bottom.pos.y = -2+0.5*cos(3*t)\n",
    "        E1.rotate(angle=dtheta, axis=vec(0,1,0))\n",
    "        E2.rotate(angle=-dtheta, axis=vec(0,1,0), origin=E2rot)\n",
    "        t += dt\n",
    "\n"
   ]
  },
  {
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   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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