{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pybindmagic"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "%%cpp -f generateMesh\n",
    "#include <pybind11/eigen.h>\n",
    "\n",
    "std::tuple<Eigen::MatrixXd,Eigen::MatrixXi> generateMesh()\n",
    "{\n",
    "  // Inline mesh of a cube\n",
    "  const Eigen::MatrixXd V = (Eigen::MatrixXd(8,3)<<\n",
    "    0.0,0.0,0.0,\n",
    "    0.0,0.0,1.0,\n",
    "    0.0,1.0,0.0,\n",
    "    0.0,1.0,1.0,\n",
    "    1.0,0.0,0.0,\n",
    "    1.0,0.0,1.0,\n",
    "    1.0,1.0,0.0,\n",
    "    1.0,1.0,1.0).finished();\n",
    "  const Eigen::MatrixXi F = (Eigen::MatrixXi(12,3)<<\n",
    "    1,7,5,\n",
    "    1,3,7,\n",
    "    1,4,3,\n",
    "    1,2,4,\n",
    "    3,8,7,\n",
    "    3,4,8,\n",
    "    5,7,8,\n",
    "    5,8,6,\n",
    "    1,5,6,\n",
    "    1,6,2,\n",
    "    2,6,8,\n",
    "    2,8,4).finished().array()-1;\n",
    "    return std::make_tuple(V,F);\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "scrolled": true
   },
   "outputs": [],
   "source": [
    "V,F = generateMesh()\n",
    "print(\"Vertices:\\n\",V)\n",
    "print(\"Faces:\\n\",F)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "%%cpp\n",
    "#include <pybind11/eigen.h>\n",
    "\n",
    "\n",
    "std::tuple<Eigen::MatrixXd,Eigen::MatrixXi> generateMesh()\n",
    "{\n",
    "  // Inline mesh of a cube\n",
    "  const Eigen::MatrixXd V = (Eigen::MatrixXd(8,3)<<\n",
    "    0.0,0.0,0.0,\n",
    "    0.0,0.0,1.0,\n",
    "    0.0,1.0,0.0,\n",
    "    0.0,1.0,1.0,\n",
    "    1.0,0.0,0.0,\n",
    "    1.0,0.0,1.0,\n",
    "    1.0,1.0,0.0,\n",
    "    1.0,1.0,1.0).finished();\n",
    "  const Eigen::MatrixXi F = (Eigen::MatrixXi(12,3)<<\n",
    "    1,7,5,\n",
    "    1,3,7,\n",
    "    1,4,3,\n",
    "    1,2,4,\n",
    "    3,8,7,\n",
    "    3,4,8,\n",
    "    5,7,8,\n",
    "    5,8,6,\n",
    "    1,5,6,\n",
    "    1,6,2,\n",
    "    2,6,8,\n",
    "    2,8,4).finished().array()-1;\n",
    "    return std::make_tuple(V,F);\n",
    "}\n",
    "\n",
    "void printMesh(Eigen::MatrixXd V,Eigen::MatrixXi F)\n",
    "{\n",
    "    py::print(\"Vertices:\\n\", V);\n",
    "    py::print(\"Faces:\\n\", F);\n",
    "}\n",
    "\n",
    "defs\n",
    "    m.def(\"generateMesh\",&generateMesh);\n",
    "    m.def(\"printMesh\",&printMesh);"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "printMesh(*generateMesh())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# CMAKE example\n",
    "\n",
    "Take a look at _pathtocmake/CMAKEList.txt_. Its a template cmake file. Make sure that the following lines are present:\n",
    "\n",
    "```\n",
    "project({name} LANGUAGES CXX)\n",
    "\n",
    "find_package(Python COMPONENTS Interpreter Development REQUIRED)\n",
    "add_subdirectory(pybind11)\n",
    "pybind11_add_module(${PROJECT_NAME} ${SRCFILES})\n",
    "```\n",
    "\n",
    "This example needs libigl in the pathtocmake folder. Clone it using:\n",
    "\n",
    "`git clone https://github.com/libigl/libigl.git`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "%%cpp -c pathtocmake -f viewMesh -rebuild\n",
    "\n",
    "#include <igl/opengl/glfw/Viewer.h>\n",
    "#include <pybind11/eigen.h>\n",
    "\n",
    "\n",
    "void viewMesh(Eigen::Matrix<double, Eigen::Dynamic, 3> V, Eigen::Matrix<int, Eigen::Dynamic, 3> F)\n",
    "{\n",
    "  // Plot the mesh\n",
    "  igl::opengl::glfw::Viewer viewer;\n",
    "  viewer.data().set_mesh(V, F);\n",
    "  viewer.data().set_face_based(true);\n",
    "  viewer.launch();\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "\n",
    "V = np.array([\n",
    "    [0.0,0.0,0.0],\n",
    "    [0.0,0.0,1.0],\n",
    "    [0.0,1.0,0.0],\n",
    "    [0.0,1.0,1.0],\n",
    "    [1.0,0.0,0.0],\n",
    "    [1.0,0.0,1.0],\n",
    "    [1.0,1.0,0.0],\n",
    "    [1.0,1.0,1.0]])\n",
    "\n",
    "F = np.array(\n",
    "    [\n",
    "        [1,7,5],\n",
    "        [1,3,7],\n",
    "        [1,4,3],\n",
    "        [1,2,4],\n",
    "        [3,8,7],\n",
    "        [3,4,8],\n",
    "        [5,7,8],\n",
    "        [5,8,6],\n",
    "        [1,5,6],\n",
    "        [1,6,2],\n",
    "        [2,6,8],\n",
    "        [2,8,4]\n",
    "    ], dtype=np.int32)-1\n",
    "viewMesh(V,F)"
   ]
  }
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