Converts in depth

An osu! beatmap can be played in another ruleset. parsecore reproduces each conversion exactly like osu!, so converted star ratings and pp match the game.

osu! → taiko

Circles become don/kat notes (decided by hit sound), and sliders are either kept as drum rolls or split into a run of hit circles following osu!-stable’s tick-spacing and velocity rules. Scroll-speed effect points are inserted so the new Reading skill sees the right velocities.

osu! → catch

Objects become fruits, droplets and juice streams. Hyperdashes are detected, and the legacy RNG is consumed for droplet jitter and banana showers exactly as in the game.

osu! → mania

This is the most involved conversion: the full legacy pattern generator decides how many columns the map uses and places notes/hold notes using osu!stable’s RNG. The generated pattern and therefore the star rating and pp is bit-identical to osu!.

from parsecore.Beatmap.beatmap import Beatmap as UserBeatmap
from parsecore.Performance import Beatmap, Difficulty, GameMode

bm = Beatmap.from_user_beatmap(
    UserBeatmap.from_path("osu_map.osu"), override_mode=GameMode.TAIKO
)
print(Difficulty().calculate(bm).stars)

Native maps of each ruleset are, of course, calculated directly without conversion.