tinyobjloader

Tiny but poweful single file wavefront obj loader written in C++. no dependency except for C++ STL. Good for embedding .obj loader to your renderer ;-)

Features

• Vertex
• Texcoord
• Normal
• Material
  • Unknown material attributes are treated as key-value.

Notes

Polygon is converted into triangle.

Usage

std::string inputfile = "cornell_box.obj";
std::vector<tinyobj::shape_t> shapes;

std::string err = tinyobj::LoadObj(shapes, inputfile.c_str());

if (!err.empty()) {
  std::cerr << err << std::endl;
}

std::cout << "# of shapes : " << shapes.size() << std::endl;

for (size_t i = 0; i < shapes.size(); i++) {
  printf("shape[%ld].name = %s\n", i, shapes[i].name.c_str());
  printf("shape[%ld].indices: %ld\n", i, shapes[i].mesh.indices.size());
  assert((shapes[i].mesh.indices.size() % 3) == 0);
  for (size_t f = 0; f < shapes[i].mesh.indices.size(); f++) {
    printf("  idx[%ld] = %d\n", f, shapes[i].mesh.indices[f]);
  }

  printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
  assert((shapes[i].mesh.positions.size() % 3) == 0);
  for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
    printf("  v[%ld] = (%f, %f, %f)\n", v,
      shapes[i].mesh.positions[3*v+0],
      shapes[i].mesh.positions[3*v+1],
      shapes[i].mesh.positions[3*v+2]);
  }

  printf("shape[%ld].material.name = %s\n", i, shapes[i].material.name.c_str());
  printf("  material.Ka = (%f, %f ,%f)\n", shapes[i].material.ambient[0], shapes[i].material.ambient[1], shapes[i].material.ambient[2]);
  printf("  material.Kd = (%f, %f ,%f)\n", shapes[i].material.diffuse[0], shapes[i].material.diffuse[1], shapes[i].material.diffuse[2]);
  printf("  material.Ks = (%f, %f ,%f)\n", shapes[i].material.specular[0], shapes[i].material.specular[1], shapes[i].material.specular[2]);
  printf("  material.Tr = (%f, %f ,%f)\n", shapes[i].material.transmittance[0], shapes[i].material.transmittance[1], shapes[i].material.transmittance[2]);
  printf("  material.Ke = (%f, %f ,%f)\n", shapes[i].material.emission[0], shapes[i].material.emission[1], shapes[i].material.emission[2]);
  printf("  material.Ns = %f\n", shapes[i].material.shininess);
  printf("  material.map_Ka = %s\n", shapes[i].material.ambient_texname.c_str());
  printf("  material.map_Kd = %s\n", shapes[i].material.diffuse_texname.c_str());
  printf("  material.map_Ks = %s\n", shapes[i].material.specular_texname.c_str());
  printf("  material.map_Ns = %s\n", shapes[i].material.normal_texname.c_str());
  std::map<std::string, std::string>::iterator it(shapes[i].material.unknown_parameter.begin());
  std::map<std::string, std::string>::iterator itEnd(shapes[i].material.unknown_parameter.end());
  for (; it != itEnd; it++) {
    printf("  material.%s = %s\n", it->first.c_str(), it->second.c_str());
  }
  printf("\n");
}