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Welcome to the official Speedometer Wiki! Speedometer is a lightweight, 100% Zero-Dependency client-side Minecraft Fabric mod designed to display real-time player and entity movement velocity directly in the native F3 Debug Screen in blocks per second (b/s).

📌 Repository Source Disclaimer: The documentation in this Wiki reflects the current source code state in the repository, which may include recent unreleased commits or developmental features ahead of public release builds on CurseForge and Modrinth.

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📊 Mod Overview Infobox

Property	Details
Mod Name	Speedometer
Mod ID	speedometer
Collection Track	Vanilla Outsider Collection
Target Minecraft Version	26.2 (>=26.2-)
Environment	Client-Side Only (client)
Dependencies	Fabric Loader (>=0.15.0)
License	GNU General Public License v3.0 (GPLv3)
Author / Developer	Dasik (Rifaditya)

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💡 Design Philosophy & Purpose

In vanilla Minecraft, movement mechanics are calculated on a per-tick basis ($20\text{ ticks} = 1\text{ second}$). In Minecraft 26.3+, vanilla introduced player_speed displaying raw velocity in blocks/tick. However, players and server administrators naturally measure travel speed in blocks per second (b/s).

Speedometer bridges this gap while respecting vanilla aesthetics:

1. Zero External Dependencies: Requires zero library mods or config engines—only Fabric Loader.
2. Native F3 Registration: Integrates directly into Minecraft's DebugScreenEntries engine under speedometer.
3. Smart Consolidation: Intelligently merges with vanilla's native player_speed line into a unified HUD display without cluttering the screen.
4. Detailed Vector Breakdown: Breaks velocity into total 3D speed, horizontal ground speed (H), and vertical velocity (V).

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📦 Minecraft Versions Directory

• Minecraft 26.2 Guide — Dedicated guide for the primary Minecraft 26.2 target release.
• Version Compatibility — Full Minecraft version lifecycle, dependency bounds, and migration history.

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🎮 Player & Feature Guides Directory

• Velocity Math & Vectors — Math formulas, vector components, and tick-to-second conversion.
• F3 Debug Integration — How Speedometer hooks into DebugScreenEntries and DebugScreenEntryList.
• Smart Consolidation & Layouts — Configuring F3 overlay states and line consolidation.
• Vehicle & Riding Physics — Tracking velocity while riding boats, minecarts, horses, or flying.
• Dynamic HUD Formatting — High-precision, zero-jitter string length formatting (%.2f).
• Camera & Entity Tracking — Spectator camera tracking and vehicle mount speed calculations.
• Ground Rest Fixes — Resolution of standing-still velocity artifacts (1.57 m/s).
• Advancements — Advancement integration status (Vanilla reliance policy).
• GameRules — GameRule configuration status (Client-side mod policy).
• Commands — Brigadier command status (GUI F3+F6 driven policy).
• Configuration — In-game F3 + F6 debug options menu setup.
• HUD & Diagnostics — Overlay display states (Always, In Overlay, OFF).

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💻 Developer & Technical Reference

• Developer Setup & Building — Building from source with JDK 25, Gradle 9.3+, and Loom 1.15+.
• Architecture & Mixins — Package hierarchy and Mixin target breakdown table.
• API & Addon Integration — Fabric entrypoints and DebugScreenEntry wrapper implementation.
• Zero-Dependency Design — Architecture rationale for lightweight client mod design.
• Performance & Rendering — Render thread impact ($<0.001\text{ ms}$) and memory allocation analysis.
• Troubleshooting & FAQ — Frequently asked questions and diagnostic solutions.