Depressing compromise to make the ordering of atoms in improper torsions as...

Depressing compromise to make the ordering of atoms in improper torsions as consistent as possible with both AMBER and CHARMM

wrappers/python/simtk/openmm/app/forcefield.py

@@ -902,7 +902,6 @@ class PeriodicTorsionGenerator:
                 if type1 in types1:
                     for (t2, t3, t4) in itertools.permutations(((type2, 1), (type3, 2), (type4, 3))):
                         if t2[0] in types2 and t3[0] in types3 and t4[0] in types4:
-                            if wildcard in (types1, types2, types3, types4):
                             # Workaround to be more consistent with AMBER.  It uses wildcards to define most of its
                             # impropers, which leaves the ordering ambiguous.  It then follows some bizarre rules
                             # to pick the order.
@@ -917,11 +916,6 @@ class PeriodicTorsionGenerator:
                             for i in range(len(tordef.phase)):
                                 if tordef.k[i] != 0:
                                     force.addTorsion(a1, a2, torsion[0], torsion[t4[1]], tordef.periodicity[i], tordef.phase[i], tordef.k[i])
-                            else:
-                                # There are no wildcards, so the order is unambiguous.
-                                for i in range(len(tordef.phase)):
-                                    if tordef.k[i] != 0:
-                                        force.addTorsion(torsion[0], torsion[t2[1]], torsion[t3[1]], torsion[t4[1]], tordef.periodicity[i], tordef.phase[i], tordef.k[i])
                             done = True
                             break
 
@@ -1549,7 +1543,6 @@ class CustomTorsionGenerator:
                                     (a1, a2) = (a2, a1)
                                 elif e1 != elem.carbon and (e2 == elem.carbon or e1.mass < e2.mass):
                                     (a1, a2) = (a2, a1)
-                                print a1, a2, torsion[0], torsion[t4[1]]
                                 force.addTorsion(a1, a2, torsion[0], torsion[t4[1]], tordef.paramValues)
                             else:
                                 # There are no wildcards, so the order is unambiguous.