message: Fix compile error, make fit-model-simple use Eigen
diff: @@ -181,8 +181,8 @@ int main(int argc, char *argv[])
  continue;
  }
  int vertex_idx = std::stoi(converted_name.get());
  - Vec4f vertex = morphable_model.get_shape_model().get_mean_at_point(vertex_idx);
  - model_points.emplace_back(vertex);
  + auto vertex = morphable_model.get_shape_model().get_mean_at_point(vertex_idx);
  + model_points.emplace_back(Vec4f(vertex.x(), vertex.y(), vertex.z(), 1.0f));
  vertex_indices.emplace_back(vertex_idx);
  image_points.emplace_back(landmarks[i].coordinates);
  }
  