Ethosoft

A Gymnasium environment wrapping 331uw13/3D-Game — a raylib/C first-person shooter with procedural voxel terrain — as a headless, steppable RL environment.

The game runs off-screen (no visible window), driven one fixed timestep (1/60s) at a time by actions from Python, via a small native library (game3denv.dll) built from the game's own C source plus a thin env API (see src/env/ in the main repo). No game-logic files were modified to make this possible — see src/env/env_shim.c for how input is injected instead.

import gymnasium as gym
import ethosoft  # registers "Game3D-v0"

env = gym.make("Game3D-v0")
obs, info = env.reset()
for _ in range(1000):
    action = env.action_space.sample()
    obs, reward, terminated, truncated, info = env.step(action)
    if terminated or truncated:
        obs, info = env.reset()
env.close()

Spaces

• Action (Dict): move (MultiBinary(4): forward/back/left/right), run, jump, shoot, aim (Discrete(2)), look (Box(-1, 1, (2,)) mouse-look delta, scaled by look_scale).
• Observation (Dict): rgb (Box(0, 255, (H, W, 3), uint8) off-screen render, resolution from game.cfg), vector (Box(-inf, inf, (12,)): health fraction, armor fraction, xp, total kills, position xyz, yaw, pitch, onground, nearest enemy distance in the current chunk, nearest enemy alive).
• Reward: Δhealth * 0.1 + Δkills * 10 + 0.01 per step, -50 on death.
• terminated when the player dies; truncated after max_episode_steps (default 2000, set via Game3DEnv(max_episode_steps=...)).

Scope (v0.1)

• Same procedurally generated world persists across episodes in a process; reset() respawns the player, it does not regenerate terrain.
• Inventory, NPC dialogue, and item crafting are not part of the action/ observation space yet.
• Only one Game3DEnv may be alive per process (the native library holds a single global game state) — use separate processes to parallelize.
• Prebuilt binary ships for Windows x64 only. On Linux/macOS, build game3denv.so yourself from the main repo (mingw32-make envlib on Windows or the equivalent GCC/Make invocation using the Makefile's envlib target on Linux/macOS with raylib installed) and drop it into ethosoft/native/ alongside res/, weapons_cfg/, and game.cfg.

License

GPL-3.0-or-later, same as the upstream game (raylib itself is zlib-licensed).