for (int f = 0; f < Block::FACE_COUNT; ++f) {
Block::Face face = Block::Face(f);
BlockLookup next(const_cast<Chunk *>(this), pos, face);
for (int f = 0; f < Block::FACE_COUNT; ++f) {
Block::Face face = Block::Face(f);
BlockLookup next(const_cast<Chunk *>(this), pos, face);