message: Don't use free build(BVH) function anymore
diff: @@ -251,7 +251,8 @@ int main(int argc, char** argv)
  std::cout << "Creating BVH...\n";
  t.reset();
  - auto h_bvh = build<index_bvh<basic_sphere<float>>>(spheres.data(), spheres.size(), true /* spatial splits */);
  + binned_sah_builder builder;
  + auto h_bvh = builder.build(index_bvh<basic_sphere<float>>{}, spheres.data(), spheres.size(), true /* spatial splits */);
  std::cout << "Time elapsed: " << t.elapsed() << "s\n\n";
  