# Example for: gbsa.scorer()
# This will calculate the GB/SA implicit solvation energy for a model.

from modeller import *
from modeller import gbsa
from modeller.scripts import complete_pdb

env = environ()
env.io.atom_files_directory = ['../atom_files']
env.libs.topology.read(file='$(LIB)/top_heav.lib')
env.libs.parameters.read(file='$(LIB)/par.lib')

# Calculate just the GB/SA score; turn off soft-sphere
env.edat.dynamic_sphere = False
env.edat.energy_terms.append(gbsa.Scorer())
# GB/SA falls off slowly with distance, so a larger cutoff than the
# default (4.0) is recommended
env.edat.contact_shell = 8.0

mdl = complete_pdb(env, "1fas")

# Select all atoms
atmsel = selection(mdl)

# Calculate the energy
atmsel.energy()