osu-lazer

Fix combined slider velocity calculation (#36773 )

This changes how the current/previous velocity is being calculated in
Aim. Currently it's being calculated as an addition of 2 velocities
together which isn't really correct, instead here velocity is being
calculated as a (combined distances) / (combined times). On practice
this buffs underweighted slider maps while overweighted ones stay about
the same

https://pp.huismetbenen.nl/rankings/players/use-proper-slider-velocity

StanR · 2026-03-02 23:14:31 +00:00

f241d9c84e

Refactor DifficultyHitObject to include ClockRate and HitWindows (#36630 )

This changes difficulty calculations to use `ClockRate` and `HitWindows`
from `DifficultyHitObjects` instead of providing them manually. It's
main purpose is unifying all the calculations to use the same source of
truth, and also allowing future work on supporting variable clockrates.

---------

Co-authored-by: James Wilson <tsunyoku@gmail.com>

StanR · 2026-02-10 20:01:51 +00:00

c8318d6edd

Add real sliderend check in rhythm (#36593 )

Classic blunder. See
https://discord.com/channels/546120878908506119/619291828054655016/1468738477297504489

StanR · 2026-02-05 17:38:59 +00:00

4eec06c1c3

Add a bunch of rhythm improvements (#36569 )

This does a couple of things:

- Adds slider->circle effective ratio adjustment
- Removes same polarity nerf for single delta count islands (which are
pretty much THE most unpredictable)
- Makes polarity nerf check actual deltas and not just the count
- Excludes spinners from ratio calculation

https://pp.huismetbenen.nl/rankings/players/minor-rhythm-improvements

---------

Co-authored-by: James Wilson <tsunyoku@gmail.com>

StanR · 2026-02-04 20:19:42 +00:00

52be3111b4

Simplify hidden difficulty calculation (#36465 )

It removes unnecessary function `DurationSpentInvisible` function that
just rescaled preempt.
Now it's just using preempt directly.
I've made multiplier to be very close to the current one, so pp deltas
should be minimal.

Givy120 · 2026-02-01 21:59:19 +00:00

ee0ac3eab4

Make sliderless aim in fact sliderless (#29993 )

Part of this PR - https://github.com/ppy/osu/pull/27303

Current aim calculation have a flaw of sliderless aim still accounting
for sliders. This happens because of usage of `LazyJumpDistance` as a
main distance metric.

This PR is fixing this by adding `JumpDistance` as true sliderless
metric, using it instead of `LazyJumpDistance`.
This can introduce very rare cases where sliderless aim is worth more
than normal aim (because of velocity change bonus).

The effect of this is minimal on most of the maps. It can be seen the
best on this map - https://osu.ppy.sh/beatmapsets/594751#osu/1257904
Before:

![image](https://github.com/user-attachments/assets/e96773e6-3274-4ed6-8293-ed9bdfa213d0)

After:

![image](https://github.com/user-attachments/assets/126e861b-c28d-4ed4-a0db-f5305225a749)

---------

Co-authored-by: James Wilson <tsunyoku@gmail.com>
Co-authored-by: StanR <8269193+stanriders@users.noreply.github.com>

Givy120 · 2026-01-27 20:23:22 +00:00

aefe31d315

Replace current AR and HD bonuses with a new Reading skill on the osu! ruleset (#33196 )

This PR aims to replace the current bonuses used to award high approach
rates and scores made using the Hidden mod with a Reading skill that
takes into account each note's reading difficulty separately, Important
to note is the fact that as reading difficulty is now a skill the
bonuses are now additive instead of multiplicative, meaning there are
vast changes in deltas on the high and low end of scores. Due to the
nature of adding a new skill new difficulty and performance attributes
need to be added.

Huis page:
[https://pp.huismetbenen.nl/rankings/admin/kwotaq-reading](url)

---------

Co-authored-by: apollo-dw <83023433+apollo-dw@users.noreply.github.com>
Co-authored-by: js1086 <js1086@student.le.ac.uk>
Co-authored-by: tsunyoku <tsunyoku@gmail.com>
Co-authored-by: StanR <hi@stanr.info>

kwotaq · 2026-01-26 01:49:51 +05:00

562f1f8004

Improve angle calculation to better represent the path taken on sliders (#35555 )

## This pr resolves the issue with the angle calculation.
The old system calculated the angle between three objects. If the last
object was a long slider that the player needed to follow, the system
calculated the angle using only the slider’s end point and the previous
object, which caused long sliders to have incorrect angle values.

---------

Co-authored-by: StanR <hi@stanr.info>
Co-authored-by: James Wilson <tsunyoku@gmail.com>

Dark98 · 2026-01-24 22:05:59 +00:00

fb8d198a64

Change the doubletapness scaling to be more punishing on the low end of the hitwindow (#36148 )

StanR · 2025-12-29 10:11:25 +00:00

dd261623cd

Use DeltaTime in RhythmEvaluator to increase stability (#32790 )

* Update RhythmEvaluator.cs

* Rename `StrainTime` into `AdjustedDeltaTime`

---------

Co-authored-by: StanR <hi@stanr.info>

Givy120 · 2025-09-16 13:31:14 +00:00

7852df639a

Buff precision difficulty rating in osu! (#28877 )

* Buff precision difficulty rating in osu!

* Fix position repetition calculation

* Fix aim evaluator crashing, move small circle bonus calculation, adjust the curve slightly

* Refactor

* Fix code quality

* Semicolon

* Apply small circle bonus to speed too

* Fix formatting

---------

Co-authored-by: James Wilson <tsunyoku@gmail.com>

StanR · 2025-05-22 09:11:51 +01:00

60eaf088df

Move difficulty calculation fields from Slider to OsuDifficultyHitObject (#32410 )

* Move difficulty calculation fields from `Slider` to `OsuDifficultyHitObject`

* Remove redundant check

* Use `LastObject` where possible

* Update tests

* Make `LazyTravelDistance` `double`

---------

Co-authored-by: James Wilson <tsunyoku@gmail.com>

StanR · 2025-04-09 13:37:26 +00:00

cf7fdc0627

Fix code issues

StanR · 2024-11-07 21:23:26 +05:00

c9d3b6557d

Add DifficultyCalculationUtils

StanR · 2024-11-07 20:36:00 +05:00

78c97d2cd7

Scale difficulty with doubletapness, make kicksliders not reduce the difficulty of the next object, adjust balancing

StanR · 2024-08-24 04:37:58 +05:00

ce8286d299

Implement a bunch of rhythm difficulty calculation fixes