in gym_soccer/envs/soccer_env.py [0:0]
def _start_viewer(self):
"""
Starts the SoccerWindow visualizer. Note the viewer may also be
used with a *.rcg logfile to replay a game. See details at
https://github.com/LARG/HFO/blob/master/doc/manual.pdf.
"""
cmd = hfo_py.get_viewer_path() +\
" --connect --port %d" % (self.server_port)
self.viewer = subprocess.Popen(cmd.split(' '), shell=False)