spaghetti - a function hooker for cooked unreal engine blueprints

guide

usage

you can run spaghetti normally with/without using cli

spaghetti --help
Usage: spaghetti [OPTIONS] [hook] [original]

Arguments:
  [hook]      path to hook-containing blueprint
  [original]  path to original blueprint

Options:
  -v <VERSION>          engine version used to create the blueprints [default: 5.1]
  -o <output path>      path to save the hooked blueprint to [default: overwrites original]
  -h, --help            Print help

limitations

• the same limitations of normal asset patching applies
• this means only one modded asset can be loaded at a time
• currently no support for hooking hooks (i need to check for existing orig_ functions)
• if there was you could unpack, merge mod blueprints and repack for compatibility
• i could add a command which merges hooks in mod paks if that's done to make that easier too

concept

• i modded my first unity game and thought "Monomod HookGen is real nifty for hooking functions and whatnot"
• on the same day i discovered kismet-analyzer's merge-functions command which merges function kismet
• that made me think "i have decent experience dealing with assets having made stove and whatnot"
• and then i thought "i could make it like hookgen where you can call the original function in your hook"
• turns out you don't need to edit kismet
• transplanting hooks using modified code from stove works
• you can redirect the funcmap to your hook and register the original under a different name
• wow you've got hookgen but for blueprint functions
• mind blown

credits

• truman for creating kismet-analyzer since, although implemented differently, it helped me come up with this idea
• atenfyr for creating the extensive UAssetAPI which made this project possible ❤️
• localcc for rewriting it as unreal_asset, allowing me to program this in rust