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   "source": [
    "from k3d import K3D\n",
    "from math import sqrt, sin, cos\n",
    "\n",
    "width = height = length = 100\n",
    "\n",
    "def r(x, y, z):\n",
    "    r = sqrt((x - width / 2) * (x - width / 2) + (y - height / 2) * (y - height / 2) + (z - length / 2) * (z - length / 2))\n",
    "    r += sin(x / 2) * 3\n",
    "    r += cos(y / 10) * 5\n",
    "    \n",
    "    return r\n",
    "\n",
    "def f(x, y, z):\n",
    "    return 0 if r(x, y, z) > width / 2 else 1 if y + sin(x / 20) * 10 > height / 2 else 2\n",
    "\n",
    "color_map = (0xffff00, 0xff0000)\n",
    "voxels = [[[f(x, y, z) for z in range(length)] for y in range(height)] for x in range(width)]\n",
    "\n",
    "plot = K3D()\n",
    "plot += K3D.voxels(voxels, color_map)\n",
    "plot.display()"
   ]
  }
 ],
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