Slider FOLLOW_AREA

[Vergenter]

In this line, the FOLLOW_AREA of the slider is assumed to be 3. Is there a specific reason for this?

slider/slider/replay.py

Line 165 in d70dc7d

and _within(nearest_pos, datum.position, rad * 3))):

In the osu!lazer repository, it is set to 2.4f:
https://github.com/ppy/osu/blob/3793a552b8756ae19722382879af72156f039cec/osu.Game.Rulesets.Osu/Objects/Drawables/DrawableSliderBall.cs#L21

Other Player Analysis

7 years ago
~2.4x circle radius based on my tests.

Source: Drezi from https://osu.ppy.sh/community/forums/topics/604682?n=4

My In-Game Analysis

Furthest Successful Hit

The follow circle expanded on a slider tick, and the score was judged.
Circle size: 72px ± 5px
Distance from slider tick to cursor: 171px ± 2px
171 / 72= 2.375, which is less than 2.4

Nearest miss

The follow circle expanded on a slider tick, and the slider tick miss animation started (cross began to fade in).
Circle size: 72px ± 5px
Distance from slider tick to cursor: 175px ± 2px
175 / 72 = 2.43 , which is greater than 2.4

Therefore, the FOLLOW_AREA should be set to 2.4.

[tybug]

Thanks, I think you're right. Replay calculation has never been perfect in slider and this is probably one of several reasons why. I've fixed this in 3b6659c.