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FAQ

This file contains a list of questions that ViZDoom users may ask at some point. You can find more questions and answers by searching for issues with "question" tag (is:issue label:question).

Did not find answer for your question? Post an issue

How to use Windows binaries?

For Windows we are providing a compiled environment that can be download from releases page. To install it see Building: Installation of Windows binaries.

Original issue and answer: Farama-Foundation#190

How to use original Doom's assets?

We cannot provide original Doom's assets due to licensing issues. ViZDoom uses freedoom2.wad as default assets. However, you can use original Doom's assets by placing doom.wad or doom2.wad in you working directory, specify path to it by using DoomGame: setDoomGamePath or place it in the same directory as vizdoom(.exe). On Unix you can also set DOOMWADDIR environment variable to directory with your wads files.

How to create/modify scenarios?

You can create or modify existing scenarios using many available Doom map editors. We recommend using one of these two editors:

  • SLADE3 - great Doom map (scenario) editor for Linux, MacOS and Windows.
  • Doom Builder 2 - another great Doom map editor for Windows.

You should select ZDoom as your Doom engine version and UDMF map format (Universal Doom Map Format), that supports the widest range of features.

Original issue and answer: Farama-Foundation#319

How to stack frames?

ViZDoom does not automatically stacks frames for you. You have to manually store the states from DoomGame: getState. and build up stacked states for your agent.

Original issue and answer: (contains code an example) Farama-Foundation#296

How to change keyboard binding for Spectator Mode?

When you launch an instance of vizdoom, it will create _vizdoom.ini in your working directory (if it does not exist yet). This file contains all the additional engine settings, including key bindings, that you can edit freely.

You can also load .ini file from different location using DoomGame: setDoomConfigPath.

Original issue and answer: Farama-Foundation#253

Is it possible to generate maze navigation scenario from a text file (like in DeepMind Lab)?

Try NavDoom or MazeExplorer.

Original issue and answer: Farama-Foundation#308

How to control game speed in ASYNC modes?

See: DoomGame: setTicrate and examples/python/ticrate.py

Original issue and answer: Farama-Foundation#209

How can to make an exact 90 degree turn in one action?

See: examples/python/delta_buttons.py

Original issue and answer: Farama-Foundation#279

See also:

Agent does not fire after picking up ammo or weapon?

Some weapons have a noautofire flag for weapons to prevent using them by accident when picking up. Agent needs to release ATTACK button and then press it again to start firing after picking one of those weapons or ammo for them.

Original issue and answer: Farama-Foundation#289

See also:

How to pick up items (medikit, ammo, armour) when inventory is full?

CVARs implemented in ZDoom engine are very helpful in quickly modifying some aspects of the game. game.add_game_args("+sv_unlimited_pickup 1") adding before init will allow picking up unlimited items.

Original issue and answer: Farama-Foundation#187

See also:

I am getting Buffers size mismatch. error

Make sure you can run ZDoom binary inside the ViZDoom package.

If the game works, go to Options -> Set Video Mode and see the list of available resolutions there. Try one of these resolutions viz ViZDoom.

Original issue and answer: Farama-Foundation#404

Issues getting ViZDoom instances communicating between each-other in Kubernetes

Try setting tty=True in all containers running ViZDoom.

Original issue: Farama-Foundation#329

Reading replays (invalid actions, wrong rewards)

Replay files are known to have wonky issues at times: Even when they are opened correctly, the read variables may be different from what they were during recording. There are tricks to fix this:

  • Try adding a small amount of sleep between proceeding actions (Original issue: Farama-Foundation#354)
  • Try using GameMode.SPECTATOR mode for reading replays. Note that processing of individual steps must be done fast, otherwise multiple steps get bundled up into one. (Original issue: Farama-Foundation#412)

Having multiple agents in one game / multiplayer issues

You can use ZDoom's multiplayer to have multiple agents in same game (see examples for how to do this). However if you use PLAYER Mode, you can not use frameskip of the make_actions (each agent has to make one step before server proceeds by one frame). See discussion in Issues below for more information.

Original issues: