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Commit 4dcdf1d6 authored by Stephen Constable's avatar Stephen Constable Committed by GitHub
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Merge pull request #1 from peastman/gromacstop 

Fixes to GromacsTopFile with different combining rules
parents 1665962a 5a81b23d
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Showing with 36 additions and 36 deletions
wrappers/python/simtk/openmm/app/gromacstopfile.py
View file @ 4dcdf1d6
......@@ -596,15 +596,13 @@ class GromacsTopFile(object):
sys.setDefaultPeriodicBoxVectors(*boxVectors)
elif nonbondedMethod in (ff.CutoffPeriodic, ff.Ewald, ff.PME, ff.LJPME):
raise ValueError('Illegal nonbonded method for a non-periodic system')
if self._defaults[1] == '1':
# factor of 138.935456 for coulomb taken from tests/TestCustomNonbondedForce.h:574
nb = mm.CustomNonbondedForce('138.935456*q1*q2/r-sqrt(C1*C2)/r^6+sqrt(A1*A2)/r^12')
nb.addPerParticleParameter('q')
nb.addPerParticleParameter('C')
nb.addPerParticleParameter('A')
elif self._defaults[1] == '2':
nb = mm.NonbondedForce()
nb = mm.NonbondedForce()
sys.addForce(nb)
if self._defaults[1] == '1':
lj = mm.CustomNonbondedForce('sqrt(A1*A2)/r^12-sqrt(C1*C2)/r^6')
lj.addPerParticleParameter('C')
lj.addPerParticleParameter('A')
sys.addForce(lj)
if implicitSolvent is OBC2:
gb = mm.GBSAOBCForce()
gb.setSoluteDielectric(soluteDielectric)
......@@ -622,7 +620,7 @@ class GromacsTopFile(object):
mapIndices = {}
bondIndices = []
topologyAtoms = list(self.topology.atoms())
exceptions = []
exclusions = []
pairs = []
fudgeQQ = float(self._defaults[4])
fudgeLJ = float(self._defaults[3])
......@@ -793,7 +791,7 @@ class GromacsTopFile(object):
phi0 = float(params[5])
if k != 0:
if harmonicTorsion is None:
harmonicTorsion = mm.CustomTorsionForce('0.5*k*(thetap-theta0)^2; thetap = step(-(theta-theta0+pi))*2*pi+theta+step(theta-theta0-pi)*(-2*pi); pi = 3.14159')
harmonicTorsion = mm.CustomTorsionForce('0.5*k*(thetap-theta0)^2; thetap = step(-(theta-theta0+pi))*2*pi+theta+step(theta-theta0-pi)*(-2*pi); pi = %.15g' % math.pi)
harmonicTorsion.addPerTorsionParameter('theta0')
harmonicTorsion.addPerTorsionParameter('k')
sys.addForce(harmonicTorsion)
......@@ -849,7 +847,8 @@ class GromacsTopFile(object):
q = float(params[4])
if self._defaults[1] == '1':
nb.addParticle([q, float(params[6]), float(params[7])])
nb.addParticle(q, 1.0, 0.0)
lj.addParticle([float(params[6]), float(params[7])])
elif self._defaults[1] == '2':
nb.addParticle(q, float(params[6]), float(params[7]))
......@@ -880,44 +879,37 @@ class GromacsTopFile(object):
continue # We'll use the automatically generated parameters
atom1params = nb.getParticleParameters(baseAtomIndex+atoms[0])
atom2params = nb.getParticleParameters(baseAtomIndex+atoms[1])
# enable tracking pairs and exceptions separately
if self._defaults[1] == '1':
pairs.append((baseAtomIndex+atoms[0], baseAtomIndex+atoms[1], atom1params[0]*atom2params[0]*fudgeQQ, params[0], params[1]))
elif self._defaults[1] == '2':
exceptions.append((baseAtomIndex+atoms[0], baseAtomIndex+atoms[1], atom1params[0]*atom2params[0]*fudgeQQ, params[0], params[1]))
pairs.append((baseAtomIndex+atoms[0], baseAtomIndex+atoms[1], atom1params[0]*atom2params[0]*fudgeQQ, params[0], params[1]))
for fields in moleculeType.exclusions:
atoms = [int(x)-1 for x in fields]
for atom in atoms[1:]:
if atom > atoms[0]:
if self._defaults[1] == '1':
exceptions.append((baseAtomIndex+atoms[0], baseAtomIndex+atom))
elif self._defaults[1] == '2':
exceptions.append((baseAtomIndex+atoms[0], baseAtomIndex+atom, 0, 0, 0))
exclusions.append((baseAtomIndex+atoms[0], baseAtomIndex+atom))
# Create nonbonded exceptions.
nb.createExceptionsFromBonds(bondIndices, fudgeQQ, fudgeLJ)
for exclusion in exclusions:
nb.addException(exclusion[0], exclusion[1], 0.0, 1.0, 0.0, True)
if self._defaults[1] == '1':
# implement named exceptions (generally used for 1-4 interactions)
# We're using a CustomNonbondedForce for LJ interactions, so also create a CustomBondForce
# to handle the exceptions.
pair_bond = mm.CustomBondForce('138.935456*q/r-C/r^6+A/r^12')
pair_bond.addPerBondParameter('q')
pair_bond.addPerBondParameter('C')
pair_bond.addPerBondParameter('A')
sys.addForce(pair_bond)
# generate 1-2, 1-3, and 1-4 exclusions
nb.createExclusionsFromBonds(bondIndices, 3)
lj.createExclusionsFromBonds(bondIndices, 3)
for pair in pairs:
pair_bond.addBond(pair[0], pair[1], [pair[2],float(pair[3])*fudgeLJ, float(pair[4])*fudgeLJ])
# create requested exclusions
for exception in exceptions:
nb.addExclusion(exception[0], exception[1])
nb.addException(pair[0], pair[1], pair[2], 1.0, 0.0, True)
pair_bond.addBond(pair[0], pair[1], [pair[2],float(pair[3]), float(pair[4])])
for exclusion in exclusions:
lj.addExclusion(exclusion[0], exclusion[1])
elif self._defaults[1] == '2':
nb.createExceptionsFromBonds(bondIndices, fudgeQQ, fudgeLJ)
for exception in exceptions:
nb.addException(exception[0], exception[1], exception[2], float(exception[3])*fudgeLJ, float(exception[4]), True)
for pair in pairs:
nb.addException(pair[0], pair[1], pair[2], float(pair[3]), float(pair[4]), True)
# Finish configuring the NonbondedForce.
......@@ -929,8 +921,16 @@ class GromacsTopFile(object):
ff.LJPME:mm.NonbondedForce.LJPME}
nb.setNonbondedMethod(methodMap[nonbondedMethod])
nb.setCutoffDistance(nonbondedCutoff)
if self._defaults[1] == '2':
nb.setEwaldErrorTolerance(ewaldErrorTolerance)
nb.setEwaldErrorTolerance(ewaldErrorTolerance)
if self._defaults[1] == '1':
methodMap = {ff.NoCutoff:mm.CustomNonbondedForce.NoCutoff,
ff.CutoffNonPeriodic:mm.CustomNonbondedForce.CutoffNonPeriodic,
ff.CutoffPeriodic:mm.CustomNonbondedForce.CutoffPeriodic,
ff.Ewald:mm.CustomNonbondedForce.CutoffPeriodic,
ff.PME:mm.CustomNonbondedForce.CutoffPeriodic,
ff.LJPME:mm.CustomNonbondedForce.CutoffPeriodic}
lj.setNonbondedMethod(methodMap[nonbondedMethod])
lj.setCutoffDistance(nonbondedCutoff)
# Adjust masses.
......
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