Better `rsqrt`

Replaces the constants Minecraft uses for their functions for calculating the reciprocal square root (aka rsqrt) with more accurate alternatives

470 Downloads

fabricutility

Rent Server with this Mod

About this Mod

Better `rsqrt`

N.B.: The accuracy benefits of this is negligible at best, so don't expect anything big to happen. This is created
purely because I want to, and I can.

Tested to work every version since 1.14 (v1.0.1)

Replaces the constant Minecraft uses in their fast reciprocal square root
(also known as InvSqrt or rsqrt) functions, to yield better accuracy:

Function	Original Value	More Accurate™ Value
`fastInverseSqrt(float)`	`0x5f3759df`	`0x5f375a86`
`fastInverseSqrt(double)`	`0x5fe6eb50c7b537aa`	`0x5fe6eb50c7b537a9`

Since Minecraft only use these functions in rendering, this "fix" should not affect world generation or other functions
that rely on the vanilla result to yield expected results.

References

Both accessed on June 13th, 2021:

Available Versions

v1.0.1release

MC 18w43a, 18w43b, 18w43c, 18w44a, 18w45a, 18w46a, 18w47a, 18w47b, 18w48a, 18w48b, 18w49a, 18w50a, 19w02a, 19w03a, 19w03b, 19w03c, 19w04a, 19w04b, 19w05a, 19w06a, 19w07a, 19w08a, 19w08b, 19w09a, 19w11a, 19w11b, 19w12a, 19w12b, 19w13a, 19w13b, 19w14a, 19w14b, 1.14-pre1, 1.14-pre2, 1.14-pre3, 1.14-pre4, 1.14-pre5, 1.14, 1.14.1-pre1, 1.14.1-pre2, 1.14.1, 1.14.2-pre1, 1.14.2-pre2, 1.14.2-pre3, 1.14.2-pre4, 1.14.2, 1.14.3-pre1, 1.14.3-pre2, 1.14.3-pre3, 1.14.3-pre4, 1.14.3, 1.14.4-pre1, 1.14.4-pre2, 1.14.4-pre3, 1.14.4-pre4, 1.14.4-pre5, 1.14.4-pre6, 1.14.4-pre7, 1.14.4, 19w34a, 19w35a, 19w36a, 19w37a, 19w38a, 19w38b, 19w39a, 19w40a, 19w41a, 19w42a, 19w44a, 19w45a, 19w45b, 19w46a, 19w46b, 1.15-pre1, 1.15-pre2, 1.15-pre3, 1.15-pre4, 1.15-pre5, 1.15-pre6, 1.15-pre7, 1.15, 1.15.1-pre1, 1.15.1, 1.15.2-pre1, 1.15.2-pre2, 1.15.2, 20w06a, 20w07a, 20w08a, 20w09a, 20w10a, 20w11a, 20w12a, 20w13a, 20w13b, 20w14infinite, 20w14a, 20w15a, 20w16a, 20w17a, 20w18a, 20w19a, 20w20a, 20w20b, 20w21a, 20w22a, 1.16-pre1, 1.16-pre2, 1.16-pre3, 1.16-pre4, 1.16-pre5, 1.16-pre6, 1.16-pre7, 1.16-pre8, 1.16-rc1, 1.16, 1.16.1, 20w27a, 20w28a, 20w29a, 20w30a, 1.16.2-pre1, 1.16.2-pre2, 1.16.2-pre3, 1.16.2-rc1, 1.16.2-rc2, 1.16.2, 1.16.3-rc1, 1.16.3, 1.16.4-pre1, 1.16.4-pre2, 1.16.4-rc1, 1.16.4, 20w45a, 20w46a, 20w48a, 20w49a, 20w51a, 1.16.5-rc1, 1.16.5, 21w03a, 21w05a, 21w05b, 21w06a, 21w07a, 21w08a, 21w08b, 21w10a, 21w11a, 21w13a, 21w14a, 21w15a, 21w16a, 21w17a, 21w18a, 21w19a, 21w20a, 1.17-pre1, 1.17-pre2, 1.17-pre3, 1.17-pre4, 1.17-pre5, 1.17-rc1, 1.17-rc2, 1.17fabric

June 13, 2021

How to Install Better `rsqrt` on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.17).

Install Mod

Open the mod browser in the dashboard and search for "Better `rsqrt`". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.17, 1.17-rc2, 1.17-rc1 (+163 more)

Server-side

~ Optional

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Better `rsqrt` server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.17). You can switch loaders with one click in the panel.

Is Better `rsqrt` compatible with fabric?

Better `rsqrt` officially supports fabric for Minecraft 1.17, 1.17-rc2, 1.17-rc1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Better `rsqrt` – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Better `rsqrt` consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.