tenzit / sa2-chao-re

Python scripts that reverse-engineer parts of SA2's chao

sa2-chao-re

This repo contains scripts that reverse-engineer parts of the chao code in Sonic Adventure 2: Battle.

Requirements

This project was developed on Linux and uses python3-venv to manage dependencies.

sudo apt install python3-venv
python3 -m venv venv
. venv/bin/activate
pip install -r requirements.txt

Usage

chao_gen.py

chao_gen.py will search for a chao with given stats and output the rng call that said chao would be generated on.

./chao_gen.py --min-stats 2 1 5 3 2 --rng-iters 200
RNG Calls: 147 Seed: 0x5c58fca5 Method C: Swim 2, Fly 1, Run 5, Power 3, Stam 2, Int 0, Luck 0, Unknown 1

See chao_gen.py --help for a full list of options

chao_animals_solver.py

chao_animals_solver.py will output the minimal number of animal glitches required to get to 99 all from a given starting amount of XP.

This was primarily used for research into the chao fruit method of chao raising.

Command-line arguments have yet to be added, so users have to dive into the code to modify any arguments.

chao_animals_solver.py isn't perfect, as there are some issues with rounding that are unaccounted for.

Precompiled output for chao_animals_solver.py can be found here