Ruler

Ruler is a lightweight, client-side selection and measurement tool for Minecraft 1.21.1 (Fabric). It lets you mark two positions in the world and instantly see a clean holographic 3D visualization of the selected area — along with all relevant measurements in a HUD overlay.

Inspired by WorldEdit CUI, but completely standalone. No server plugin or WorldEdit installation required.

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How it works

Press R to activate the ruler (rebindable under Controls → Ruler).

• Left-click a block to set Pos1
• Right-click a block to set Pos2

That's it. The selection renders immediately.

Press R again to deactivate and clear the selection.

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3D Visualization

The selection is rendered as a holographic wireframe box directly in the world:

• XYZ color-coded edges — X red, Y green, Z blue
• Subtle inner grid for spatial orientation
• Transparent block highlights at Pos1 (green) and Pos2 (red)
• Single positions are shown before the second is placed
• Clean, modern look — no chunky vanilla-style boxes

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HUD Overlay

A small panel in the top-left corner shows:

Field	Description
Pos1 / Pos2	Block coordinates
Distance	Direct 3D diagonal (air-line)
X / Y / Z	Dimensions of the selection
Area	Footprint (X × Z)
Volume	Total blocks (X × Y × Z)

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Languages

Ruler ships with 37 languages out of the box:

Standard: English, Deutsch, Français, Español, Italiano, Português, Русский, Українська, Polski, Nederlands, Svenska, Dansk, Norsk, Suomi, Čeština, Slovenčina, Magyar, Română, Türkçe, Ελληνικά, 简体中文, 繁體中文, 日本語, 한국어, العربية, עברית, Tiếng Việt, ภาษาไทย

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Compatibility

• ✅ Client-side only — works on any server, no server mod needed
• ✅ ModMenu — appears correctly in the mod list
• ✅ Fabric API required

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Requirements

• Minecraft 1.21.1
• Fabric Loader ≥ 0.17.3
• Fabric API