high pass randomness bug

[LiuShuai26]

When executing a high pass there are two manifestations, one is that the ball will kick into the air and land at the teammate's position(higher one), and the other is that the ball will kick into the air and land on the ground midway through the approach to the teammate and bounce up to the teammate's position(lower one).

I thought that the two manifestations of the high pass were meant to add randomness to the high pass. However, I found that when starting a game where one team's high pass manifestation is one of the above two, and it will remain the same for the entire game. At the same time, the other team's high pass performance will be the other one and will remain the same for the entire game too. This will affect the balance of the game.

Here is some screen records.

higher one: lower one:

test code i am using as below. you can continually execute this script to see both manifestations.

import gfootball.env as football_env


env = football_env.create_environment(
    env_name="test_custom",
    number_of_left_players_agent_controls=2,
    number_of_right_players_agent_controls=2,
    render=True,
    other_config_options={
        "real_time": True,
    },
)


o = env.reset()

while True:
    a = [10, 0, 0, 0]

    o, r, d, info = env.step(a)
    if d:
        break

scenario:

from . import *

def build_scenario(builder):
  builder.config().game_duration = 3000
  builder.config().right_team_difficulty = 1
  builder.config().left_team_difficulty = 1
  builder.config().deterministic = False
  if builder.EpisodeNumber() % 2 == 0:
    first_team = Team.e_Left
    second_team = Team.e_Right
  else:
    first_team = Team.e_Right
    second_team = Team.e_Left
  builder.SetTeam(first_team)
  builder.AddPlayer(0.000000, 0.000000, e_PlayerRole_GK)
  builder.AddPlayer(0.9,  0.0, e_PlayerRole_CB)
  builder.SetTeam(second_team)
  builder.AddPlayer(-1.000000, 0.000000, e_PlayerRole_GK)
  builder.AddPlayer(0.9,  0.0, e_PlayerRole_CB)