superiorobs.py

import math
import numpy as np
from typing import Any, List
from rlgym.utils import common_values
from rlgym.utils.gamestates import PlayerData, GameState, PhysicsObject
from rlgym.utils.obs_builders import ObsBuilder

class SuperiorObs(ObsBuilder):
    VEL_STD = 2300
    POS_STD = 3000 # If you read this and wonder why, ping Rangler in the dead of night.
    CARANG_STD = 5.5
    BALLANG_STD = 6

    def __init__(self):
        super().__init__()

    def reset(self, initial_state: GameState):
        pass

    def build_obs(self, player: PlayerData, state: GameState, previous_action: np.ndarray) -> Any:

        if player.team_num == common_values.ORANGE_TEAM:
            inverted = True
            ball = state.inverted_ball
            pads = state.inverted_boost_pads
        else:
            inverted = False
            ball = state.ball
            pads = state.boost_pads

        obs = [ball.position / self.POS_STD,
               ball.linear_velocity / self.VEL_STD,
               ball.angular_velocity / self.BALLANG_STD,
               previous_action]

        player_car = self._add_player_to_obs(obs, player, ball, inverted)

        allies = []
        enemies = []

        for other in state.players:
            if other.car_id == player.car_id:
                continue

            if other.team_num == player.team_num:
                team_obs = allies
            else:
                team_obs = enemies

            other_car = self._add_player_to_obs(team_obs, other, ball, inverted)

            team_obs.extend([
                (other_car.position - player_car.position) / self.POS_STD,
                (other_car.linear_velocity - player_car.linear_velocity) / self.VEL_STD
            ])

        obs.extend(allies)
        obs.extend(enemies)
        return np.concatenate(obs)

    def _add_player_to_obs(self, obs: List, player: PlayerData, ball: PhysicsObject, inverted: bool):
        if inverted:
            player_car = player.inverted_car_data
        else:
            player_car = player.car_data

        rel_pos = ball.position - player_car.position
        local_pos = np.array([np.dot(player_car.forward(), rel_pos), np.dot(player_car.right(), rel_pos), np.dot(player_car.up(), rel_pos)])
        rel_vel = ball.linear_velocity - player_car.linear_velocity

        obs.extend([
            rel_pos / self.POS_STD,
            local_pos / self.POS_STD,
            rel_vel / self.VEL_STD,
            player_car.position / self.POS_STD,
            player_car.forward(),
            player_car.right(),
            player_car.up(),
            player_car.linear_velocity / self.VEL_STD,
            player_car.angular_velocity / self.CARANG_STD,
            [player.boost_amount,
             int(player.on_ground),
             int(player.has_flip)]])

        return player_car