Better `rsqrt`
Replaces the constants Minecraft uses for their functions for calculating the reciprocal square root (aka rsqrt) with more accurate alternatives
⬇ Download on ModrinthBetter 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:
- Ships as better-rsqrt-1.0.1.jar — drop this file into the mods folder
- Download size: 11 KB
- Download link checked 5 Sept 2026 — working
These come from our own check of the pack file, not from the source page.