Better 3D hash

// Tested with coords x -100 to 100, y 0 to 255, z -100 to 100

// Vec3.hashCode() has a 50:1 collision rate.  (Out of 10327500 coords, had 10127195 collisions)
// Algorithm below has a 0.0018:1 collision rate.  (Out of 10327500 coords, had 18640 collisions)

// Constants: Horizontal (x,z) and Vertical (y) ranges of values < 0
final int H = 100;
final int V = 0;

// Make coords positive with different prime bases
int xh = x + H + 31;
int yh = y + V + 37;
int zh = z + H + 41;

// Not pretty, but best I've found yet
hash =  yh + ((yh * 43) * (xh+(xh * 47)) * zh) + (zh * 53);