Function cost_diff

src/vec.cpp:969–973

}

static double cost_diff(int desired_chunks, std::complex<double> costs) {
  double left_cost = real(costs) / (desired_chunks / 2);
  double right_cost = imag(costs) / (desired_chunks - desired_chunks / 2);
  return right_cost - left_cost;
}

void grid_volume::tile_split(int &best_split_point, direction &best_split_direction) const {
  const size_t ntot_thresh = 10;