public static double Distance(Residue r1, Residue r2)
{
double minDist = double.MaxValue;
foreach (Atom a1 in r1._atoms)
{
foreach (Atom a2 in r2._atoms)
{
double dist = Atom.Distance(a1, a2);
minDist = Math.Min(dist, minDist);
}
}
return(minDist);
}