{

  if ( indices_segments != opt_segments )
    {
      for ( int i=1; i<chain_length; i++ )
        for ( int t=0; t<opt_segments; t++ )
          for ( int inner=0; inner<2; inner++ )
            bset_spiral2 << ivec4(i,t,inner,0);
    }

  buf_uni_common->chain_length = chain_length;
}


{ for(int i=0;i<chain_length;i++)balls[i].push(amt);}
{ for(int i=0;i<chain_length;i++)balls[i].stop();}