dayz-build-imageset

name	dayz-build-imageset
description	Pack PNG sprites from `<mod>/.gui-sources/<setname>/` into a DayZ imageset (`.imageset` + `.paa` atlas) at `<mod>/gui/imagesets/<setname>.{imageset,paa}`, with a 10px gutter between every sprite. Source PNGs live outside the PBO payload (in `.gui-sources/`); only the packed atlas + definition file ship. Each subfolder of `.gui-sources/` becomes one imageset.

Path note: <skill-dir> in commands below is the absolute path of this skill's folder. When the agent loads this skill the harness exposes the skill's base directory; substitute it before running. Sibling skills are reached via <skill-dir>\..\dayz-X\.

/dayz-build-imageset

Pack a folder of PNG sprites into a DayZ imageset (atlas + .imageset definition file). Source images stay in .gui-sources/ (kept out of the mod payload); only the packed .paa atlas and .imageset file land under gui/imagesets/ where the engine expects them.

Layout convention:

<mod-root>/
  .gui-sources/
    my_icons/
      hud_health.png
      hud_stamina.png
      hud_thirst.png
    main_menu/
      ...
  gui/
    imagesets/
      my_icons.imageset      <- generated
      my_icons.paa           <- generated
      main_menu.imageset
      main_menu.paa

Follow .claude/skills/_shared/dayz-conventions.md.

How to run

python "<skill-dir>\build_imageset.py" [<mod-root>] [--mod-name <name>]

Argument	Required?	Notes
<mod-root>	no	Folder containing .gui-sources/. Defaults to current directory.
--mod-name <name>	no	Name used in the path field of the .imageset (<name>\gui\imagesets\<setname>.paa). Defaults to the basename of <mod-root>.

What it does

1. Preflight gate (DayZ Tools needed for ImageToPAA.exe).
2. Resolve ImageToPAA.exe from DayZ Tools.
3. For each subfolder of <mod-root>/.gui-sources/:
   • Collect all .png files in that subfolder. Each file becomes one named sprite (the file's stem becomes the ImageSetDefClass name).
   • Sort sprites by height descending and shelf-pack into the smallest power-of-two atlas that fits (each dimension picked from 256 / 512 / 1024 / 2048 / 4096; rectangular atlases allowed; ordered by area, square preferred at equal area), with a 10px gutter on all sides of every sprite.
   • If everything fits in one atlas: emit <setname>.{paa,imageset}.
   • If sprites won't fit in a single 4096x4096 atlas: greedily split into multiple atlases and emit <setname>_1.{paa,imageset}, <setname>_2.{paa,imageset}, etc. Each part is its own self-contained imageset.
   • Compose each atlas as PNG via Pillow, convert to .paa via ImageToPAA.exe.
   • Each .imageset's path references its own .paa via <mod-name>\gui\imagesets\<stem>.paa.
4. Report a summary; exit non-zero if any imageset failed.

Generated .imageset format

ImageSetClass {
 Name "my_icons"
 RefSize 512 512
 Textures {
  ImageSetTextureClass {
   mpix 0
   path "MyMod\gui\imagesets\my_icons.paa"
  }
 }
 Images {
  ImageSetDefClass hud_health {
   Name "hud_health"
   Pos 10 10
   Size 64 64
   Flags 0
  }
  ...
 }
 Groups {
 }
}

Pos is the sprite's top-left in atlas pixels (after gutter); Size is the sprite's own dimensions (gutter is NOT included in Size).

Refuses to run if

• /dayz-preflight returns non-zero.
• <mod-root> isn't a directory.
• <mod-root>/.gui-sources/ doesn't exist or has no subfolders.
• A single sprite is larger than 4096x4096 minus gutter (won't fit in any allowed atlas size). Shrink it or deliver it outside an imageset.
• ImageToPAA.exe is missing from DayZ Tools.

Do not

• Don't pack source PNGs into the PBO; they stay in .gui-sources/ so the deployed mod ships only the atlas + definition.
• Don't add gutter pixels to the per-sprite Size values; the engine reads Size as the sprite's own dimensions.
• Don't drop the 10px gutter; it prevents bleed between adjacent sprites at non-1:1 scaling.
• Don't change atlas to non-power-of-two; both width and height are POT independently (rectangular allowed). DayZ's GUI subsystem and .paa toolchain expect POT dimensions.