Adding chapters to your mod
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Chapters are used to split single-player mods down into manageable chunks. They give your story more structure and allow players to jump into the game half-way through if they so desire. They can also be used to control which background maps/images are displayed.
Adding chapters to your mod is a little complicated, because you need to modify a number of files in order to add new chapters.
Scripts
Registering a chapter
Create <mod>\cfg\chapter1.cfg. This will create a chapter, and contains the console commands that the game will run when it is started. Typically just:
map <first map of the chapter>
Do this for all your chapters.
Localising names
Create (or open, if it exists already) <mod>\resource\<mod>_english.txt (or _french, _japanese, etc). This is your mod's localisation file, where you write the unicode titles for your chapters.
Yours should look something like this:
lang
{
Language "English"
Tokens
{
modname_Chapter1_Title "Chapter 1 title"
}
}
If there are existing tokens in the file, don't remove them. Just add yours somewhere.
Note:Localization files must be saved in the UCS-2 Little Endian format. In Notepad's "Save As..." dialogue this is called "Unicode".
In Notepad++, in Toolbars > Encoding, this is called "UCS-2 LE BOM".
Note:Wrap any keys or values with whitespace in "quote marks".Fixing on-screen titles
<mod>\scripts\titles.txt defines what appears on-screen when a new chapter starts.
Find the "chapter titles" section and modify it like so:
//CHAPTER TITLES
$fadein 0.01
$holdtime 3.5
$position -1 0.58
CHAPTER1_TITLE
{
#YourModName_Chapter1_Title
}
This file should be saved as normal ANSI.
Images
Thumbnails
You need to create thumbnails for each of your chapters. They should be in <mod>\materials\vgui\chapters\ and named chapter1, chapter2, chapter3 etc.
Note:The images displayed in the new game dialogue are 152x86. Since texture dimensions must both be a power of two, your VTFs will be 256x128 with a border to the right and bottom.
Note:For 
Half-Life 2 20th anniversary (and also games on 
Team Fortress 2 branch), which support VGUI High-DPI scaling, higher resolution such as 512x256 can be also used, to make chapter thumbnail less blurry or pixelated on higher DPI display. You will need to add $basetexturetransform if you use high resolution.Note:For the Gamepad UI (used on 
Steam Deck by default), the chapter thumbnails are instead located in materials\gamepadui\chapter#.vtf, and they are in higher "2048x1024" resolution.Note:Since these are UI textures, they should be compiled without mipmaps and with level of detail disabled. The VTEX commands for this are nomip and nolod.
Disabling mipmapping are not required for Gamepad UI thumbnails.
Your material should look something like this:
Backgrounds
<mod>\scripts\chapterbackgrounds.txt ties background maps and images to chapters. A background will not be used until the chapter it is associated with has been unlocked (see next section).
Here is what it might look like:
chapters
{
1 "my_background01"
2 "my_background02"
3 "my_background03"
}
Each value should be the name of a map in <mod>\maps\ (unless you don't want background maps at all) and a material in <mod>\materials\console\. It's okay to omit a chapter.
See Menu Background Map for more details.
Maps
Unlocking chapters
By default, all chapters except the first start off locked. Unfortunately, Valve's not-terribly-good method of unlocking requires your maps to have the same names as theirs!
You can work around this issue by starting your mod off with all chapters unlocked (set sv_unlockedchapters to the number of chapters your mod has in <mod>\cfg\modsettings.cfg). To actually unlock chapters, you will need to edit your mod's code, or hack it within maps. The latter method is not recommended unless you are modding a game such as Portal that does not provide code.
Equipping players
Players who start a new game at a chapter half-way through your mod will drop into the world without any items. To equip them with the weapons and other goodies they are supposed to have, use a logic_auto's OnNewGame output to spawn a point_template.
The map list
This is not necessary but is used to easily find the names of maps without quitting and relaunching the game.
Create <mod>\maplist.txt and list of maps that your mod will use. For example:
Map1 Map2
Creating chapters with XBLAH's Modding Tool
Chapters for single-player games can be created with 
XBLAH's Modding Tool through an UI. The modder can easily create new chapters, select the chapter images, chapter background images, the first map of the chapter, the background map, and the tool will do the dirty work of creating the required vtfs, vmts and scripts. It gives the option to automatically blur the background images, so the modder can just take a screenshot of the background map and the tool will apply the usual blur. This replaces the need of saving VTFs, creating chapter images with weird proportions, and so on.
Where to find it
This can be accessed within the tool through Mod > Chapters.
How to use it
You can insert a new chapter by clicking 
button.
Select a chapter ID (Example 1, 2, 3, or A, B, C, etc) and a chapter title. Right click the picture box next to the Chapter Image label and select a screenshot to show up in the New Menu window. Right click the picture box next to the Chapter Background label and select a screenshot to show up as the menu background (or as the loading screen if a background map is set). Select the map that will load when the user selects that chapter, and, optionally, select a background map.
