getSubvoxel()

Voxel& Voxel::getSubvoxel(std::array<unsigned,3> p_index, unsigned p_lvl, std::array<char,3>& sub_index);
Voxel& Voxel::getSubvoxel(std::array<unsigned,3> p_index, unsigned p_lvl, char j);
Voxel& Voxel::getSubvoxel(std::array<unsigned,3> sub_index, unsigned p_lvl);

Method of the Voxel class. Returns a reference to a child voxel using either the parent index p_index or the child's index sub_index directly. The three-number index refers to the index inside the order 3 storage tensor in the Space class.

p_lvl refers to the level of the parent voxel. If the parent index is used for access, then either an array of chars or a single char can be used to specify the exact child. In the array of chars, each number refers to the index in the 2x2x2 block with which the children fill out their parent.