Chunithm: Add song ranks, improve non-S rating calculation #166

mrarythmia · 2024-07-15T01:56:59Z

mrarythmia commented

2024-07-15 01:56:59 +00:00

This change adds song ranks to the Chunithm Rating pages and tries to improve the song rating calculation for <= AAA ranks. It looks like this now:

Before this change, all <= AAA ranks had their ratings calculated as the minimum possible value for a given score interval (for example, for AAA scores, the rating was the score constant - 3). Chunithm increases this score (almost) linearly throughout the score interval, per the rating formula in this guide.

Almost linearly, because the guide and its linked rating calculator on Google Sheets also appears to be wrong. For example, a 月の光 (14.8) scored at 961592 (AAA) gets a rating of 13.36 in the guide calculator, 13.99 in the Artemis frontend as of this change, 11.8 in the Artemis frontend before this change, but gets rated by Chunithm itself somewhere between 13.96 (MEGALOVANIA, 13.5, 986697, S - all calculators agree on the rating) and 13.81 (SON OF SUN, 13.8, 975467, S - same). So 13.99 is obviously not right here, but a lot closer to the real value than 11.8. (The real solution is to get gud.)

This also tries to correctly calculate ratings for Chunithm versions before New. The maximum rating ceiling in New onwards is 2.15 for 1 090 000, while it used to be 2.0 for 1 075 000.

This change adds song ranks to the Chunithm Rating pages and tries to improve the song rating calculation for <= AAA ranks. It looks like this now: ![image](/attachments/8edb4d97-a96e-4752-b47a-5f37b49ba19b) Before this change, all <= AAA ranks had their ratings calculated as the minimum possible value for a given score interval (for example, for AAA scores, the rating was the score constant - 3). Chunithm increases this score (almost) linearly throughout the score interval, per the rating formula in [this guide](https://docs.google.com/document/d/1bsVv3-cOuk_0ZMlLq8joqcwa5YUM_Ff4VnQCgJIkUOk/edit#heading=h.i8cyuvfqjg1). Almost linearly, because the guide and its linked rating calculator on Google Sheets also appears to be wrong. For example, a 月の光 (14.8) scored at 961592 (AAA) gets a rating of 13.36 in the guide calculator, 13.99 in the Artemis frontend as of this change, 11.8 in the Artemis frontend before this change, but gets rated by Chunithm itself somewhere between 13.96 (MEGALOVANIA, 13.5, 986697, S - all calculators agree on the rating) and 13.81 (SON OF SUN, 13.8, 975467, S - same). So 13.99 is obviously not right here, but a lot closer to the real value than 11.8. (The real solution is to get gud.) This also tries to correctly calculate ratings for Chunithm versions before New. The maximum rating ceiling in New onwards is 2.15 for 1 090 000, while it used to be 2.0 for 1 075 000.

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25 KiB

mrarythmia added 1 commit 2024-07-15 01:57:04 +00:00

Add song ranks, improve non-S rating calculation 39e89d4908

mrarythmia changed title from ~~Add song ranks, improve non-S rating calculation~~ to Chunithm: Add song ranks, improve non-S rating calculation

2024-07-15 01:59:31 +00:00

Hay1tsme commented

2024-07-15 18:30:50 +00:00

Looks good, thank you for contributing!

Hay1tsme merged commit 2647baef1e into develop

2024-07-15 18:31:13 +00:00

Hay1tsme referenced this issue from a commit

2024-07-15 18:31:16 +00:00

Merge pull request 'Chunithm: Add song ranks, improve non-S rating calculation' (#166) from mrarythmia/artemis:develop into develop

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