Bits 0.. 2 : index of 1st child.
Bits 3.. 5 : index of 2nd child.
Bits 6.. 8 : index of 3rd child.
Bits 9..11 : index of 4th child.
Bits 12..14 : index of 5th child.
Bits 15..17 : index of 6th child.
Bits 18..20 : index of 7th child.
Bits 21..23 : index of 8th child.
Computes the order in which the child nodes shall be visited for optimal performance.
-1 if result is always less than or equal minimum in, 0 if result is always greater than or equal to maximum in, 1 if tandem traversal shall continue with first in, 2 if tandem traversal shall continue with second in
Checks if the given pair of spatial nodes needs to be considered for tandem traversal.