{
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   "source": [
    "import cadquery as cq\n",
    "\n",
    "# 1.  Establishes a workplane that an object can be built on.\n",
    "# 1a. Uses the named plane orientation \"front\" to define the workplane, meaning\n",
    "#     that the positive Z direction is \"up\", and the negative Z direction\n",
    "#     is \"down\".\n",
    "# 2.  Creates a 3D box that will have a hole placed in it later.\n",
    "result = cq.Workplane(\"front\").box(3, 2, 0.5)\n",
    "\n",
    "# 3.  Select the lower left vertex and make a workplane.\n",
    "# 3a. The top-most Z face is selected using the >Z selector.\n",
    "# 3b. The lower-left vertex of the faces is selected with the <XY selector.\n",
    "# 3c. A new workplane is created on the vertex to build future geometry on.\n",
    "result = result.faces(\">Z\").vertices(\"<XY\").workplane()\n",
    "\n",
    "# 4.  A circle is drawn with the selected vertex as its center.\n",
    "# 4a. The circle is cut down through the box to cut the corner out.\n",
    "result = result.circle(1.0).cutThruAll()\n",
    "\n",
    "# Displays the result of this script\n",
    "show_object(result)\n"
   ]
  }
 ],
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