public static long getXYZHash(int x,int y,int z)
{
    long sign_bits = (long)((x & 0x80000000) >> 29 | (y & 0x80000000) >> 30 | (z & 0x80000000) >> 31);
    return ((long)x & 0x0000ffff)<<31|((long)y & 0x0000ffff)<<17|((long)z & 0x0000ffff)<<3|sign_bits;
}