Developer Debug Menu

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When developing your mod, it is important to be able to have a fast feedback loop and have extensive set of tools which can help to test our mod. Exactly for that reason, we have the Developer Menu. This article goes in detail over the menu and all of its features.

Keyboard Shortcuts

The following keyboard shortcuts are enabled during dev mode:

Shortcut Key Action
F1 Brings up the developer debug menu. This needs to be done in order to have full access to the developer features when running a game in debug mode.
F2 Pauses / Resumes the game world processes, basically makes the game freeze. Note that you can still noclip in this state.
F3 This makes the game run 4 times faster. It is good if you want to skip specific sections in the map.
F4 This makes the game run 4 times slower. It is good if you want to want to focus on something that happens very fast in the map.
F5 Reloads the current map.
F7 Enables / Disables spectator camera mode (noclip).
F8 Takes a screenshot of the game and saves it inside the main game folder.
F9 Quick-saves the game.
F10 Quick-loads the last save.
Insert Starts / Stops quick input recording and saves to the file QuickRecord.sav.
Home Starts playing back the last quick input recorded file.

Debug Menu

The debug menu is where most of the work happens. There, you can find a list of useful actions which will help you in your mod development.

Debug Texts

This section is at the very top of the menu and consists of checkboxes which display different information about the game, map, physics, script, etc on in the form of text on the screen.

Texts Options

Option Description
Show FPS Shows the game FPS.
Show module info Shows information about different user modules. It does not seem to be useful however, as not enough information is displayed.
Show map info Shows the amount of entities in the map and their state.
Show entity info Does not work.
Show sounds playing Shows a list of all the sounds that currently play in the map, and information about them.
Show sound params Adds additional information to the sounds playing list (distance from player)
Show sound categories Shows a list of all the different sound level categories.
Show sound ai event Shows a message when an Ai agent has heard a sound.
Show debug messages Shows dev messages which are specified in the map script file.
Show event/voice messages Does not work.
Inspection Mode Enables inspection mode, which displays information about assets used in the map, such as texture files, location on disk, size, etc.
Occlusion Culling Enables occlusion culling (Skips rendering polygons that are no in the view of the player ).
God Mode Makes the player invincible and prevents from getting chased by enemies.
Draw physics debug Displays physics bodies (pink) of static objects and entities in the map.
Overlay physics debug Displays physics debug + normal game meshes.
Draw Gui debug Displays pink overlay which represents intractable GUI elements.
Show TV Safe Area Shows the safe area of a TV, surrounded by red borders.
Show Missing Voice Error Lists voice subjects which have missing voice files.
Resource Logging Logs game resources. [Clarify]
Show non-preloaded resources Lists resources which are not preloaded by the game. [Clarify]
Show Memory Usage Shows information about the game memory usage:

Memory Usage: The amount of VRAM used by the renderer. This contains frame buffers, shadows, terrain and post-effects. It is greatly affected by the resolution of the window.

Texture Memory Usage: The texture memory used by the level. This contains all the textures used for the materials of the objects. Texture memory is reduced by a lot with just a few changes in the config file.

Vertex Memory Usage: The amount of VRAM used by meshes and decals. The imporant difference between Vertex and Texture memory is that Vertex memory can't be reduced by changing a setting. It takes up as much space on a good and a bad computer.

Total Memory Usage: The sum of the above memory usage.

Show Rendering Info Shows information about the game rendering:

Draw Calls - The number of objects rendered in the current scene.

Rendered Triangles / Vertices - The total number of triangles and vertices rendered per frame.

Queries - A special draw call used to check if an object is occluded. It is more expensive than a draw call.

Show Garbage Collection Shows a graph of garbage collection. [Clarify]
Show Debug Info Window Displays a window with debug information. [Clarify]
Hide Sleeping Entities Makes sleeping entities invisible in the map. To do: Link to source about sleeping entities
Use Portal Culling Enables the game to use portal culling in the map. It is recommended to always leave that on, unless you want to see the difference in performance. To do: add reference link for portals

Additional Options


The brightness slide increases / decreases the brightness of the game. Not to be confused with gamma.

Print Container Debug Info

This button prints container debug info to the screen.

Merge Lang Files

Merges two language files between the main game language file and another.

Note icon.png This feature doesn't seem to be useful in practice.


The map section of the menu includes settings and actions which are related to maps in general, as well as the currently-loaded map.

Auto Reload Resources

This makes the map reload resources (mostly game assets) automatically, should you change or add something to the mod.

Reload Script At Task Switch

The script file for the map will be updated when a task switch has been performed. Meaning, as long as you do not go back to the game after changing the script, the new script won't be updated in the game.

Reload Script Constantly

The script file for the map will be updated constantly every time it is saved. It doesn't matter if the game task is focused or not.

Recompile Script and Lang

Leftover feature from HPL2. The button does not work.

Reload from current pos

When reloading a map, the player will retain the current position instead of starting at the beginning of the map.

Fast Physics Load

Unknown option. [Clarify]

Reload Game

Reloads the map. This also resets the state of the player and all the other scripts which run in the background.

Script Debug

Script Debug enables further scripting features that won't work otherwise, such as OnAction. It is also useful to make your map behave differently. In your map script file, you may want to change the behavior of your map depends if the script debug is enabled or not. For example:

// This script will enable the player's flashlight only if the script debug is on.
void OnStart()
  if (cScript_ScriptDebugOn()) // Checks if Script Debug option is turned on or not

Teleport to Start Pos

Teleports the player to a specific PlayerStart Area that can be selected from the dropdown list. Useful for skipping areas in a map.

Load Map

Select a map file to load in the game. HPL3 Map File (.hpm) and HPL2 Map File (.map) are accepted.

Alert icon.png Warning: Some things are almost guranteed to not load correctly when loading HPL2 map files, mostly related to issues with static-objects. This is due to the internal structure of the .map files and how it handles assets information.

Test Change Map Save

Unknown option. [Clarify]

Preload Map

Loads another map in the background so it can be loaded later much faster. Main article: Level Streaming

Start Preloaded Map

Loads the pre-loaded map. If no map has been pre-loaded, the button will do nothing.

Keep Previous Map Loaded

Keeps the previous map loaded. This is useful if you want to go quickly switch between two maps.

Preload Priority

Sets the priority of the map preload process. Ranges from paused to very high


The game section of the menu includes general-purposes option which affect how you play and move in the game. It also displays debug information such as scripting errors.


The Input section of the menu includes tools and option for capturing and analyzing user input.

Stress Test

This is a tool used to test the map under heavy performance conditions.


The misc section include options which don't fit anywhere else.

Graphics Debug

Debugging the graphic performance of a level is vital to understand which parts are causing the bottleneck. It can also be used to find bugged/incorrect meshes or entities. With this section of the debug menu, you will be able to find which parts of the scene take up the most performance.

Show FPS Graph

This option displays on the screen a graph that shows FPS peaks on a time scale. It's useful for finding areas in a map that reduce FPS the most.

FPS graph.

Large Light Test

Unknown option.

Previous Frame Occlusion

This option pauses the occlusion culling and renders the scene with the occlusion culling from before the checkbox was ticked. This is used to see how effective the occlusion culling is in the specific scene. After activating this you can switch to to spectator camera mode and look at the scene from another angle to see where the culling fails. Activating this will disable rendering of translucent objects since they can be unstable.

On the left, you can see what the player sees. On the right, the camera has been moved back and it is now possible to see all the objects that get rendered this frame. There are a lot more than what it looks like in the left picture.


Shows what the frame buffers look like. These are then used by the lights to shade the scene. It can be used to check if a model has incorrect textures or normals.

A scene in a g-buffer mode. Notice the different graphic modes.

Light Complexity

Light complexity shows how expensive the lighting of a scene is. It creates a heat map on the screen to show how much power each light takes. Overdraw of light is not very expensive, it is about twice as expensive as a translucent object. When the light has a shadow map it becomes much more expensive. The complexity of a shadow casting light is based on how many draw calls and triangles are required to generate the shadow map.

The red areas on the right image are not good. There seem to be multiple large (in screen space) shadow casting lights in this scene.
Icon tip.png Tip: To test if most of the complexity comes from shadows or not, you can toggle the Draw Shadows checkbox in the menu. Here is what the scene complexity looks like without shadows. Here is what the scene complexity looks like without shadows:


Creates a heat map that shows how much translucent overdraw each pixel receives. Overdraw is how many times a pixel gets rendered to.[Clarify]
The goal should be that no part of the screen is red. It does not matter that much if only a small part is, however.

On the left you can see the scene rendered normally. The fog particles are barely visible here. On the right the pixel overdraw is rendered. The red areas show that more than 32 translucent planes are rendered, which is not good.