message: Apply the same Eigen::Vector3f change to fitting.hpp
  This seems to be unused (uninstantiated) code, and only clang complains, but not MSVC & gcc.
diff: @@ -160,8 +160,8 @@ inline auto get_corresponding_pointset(const T& landmarks, const core::LandmarkM
  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);
  }
  