There’s a spatial hash function described in Optimized Spatial Hashing for Collision Detection of Deformable Objects. They use the hash function
hash(x,y,z) = ( x p1 xor y p2 xor z
p3) mod nwhere p1, p2, p3 are large
prime numbers, in our case 73856093,
19349663, 83492791, respectively. The
value n is the hash table size.
In the paper, x, y, and z are the discretized coordinates; you could probably also use the binary values of your floats.