Lumen Java 1.0.0-beta.1 - Minecraft 26.3

First public Fabric beta of Lumen for Minecraft Java 26.3.

Features

• Ore Xray with ten ore categories and independent filters for normal, trapped and ender chests.
• Optional through-wall markers, a 4-24 block radius and 32-512 nearest markers.
• Hold-to-zoom (2x-20x), Fullbright and an English in-game menu in Auron colors.
• Saved settings and rebindable keys. Defaults: Insert menu, X Xray, hold C Zoom, B Fullbright.

Install

1. Install Fabric Loader 0.19.5 or newer for Minecraft Java 26.3.
2. Put lumen-java-1.0.0-beta.1.jar and Fabric API 0.161.0+26.3 in that profile's mods folder.
3. Start the Fabric profile, enter a world and press Insert. Enable Xray and select the filters you want.

Fabric Loader · Matching Fabric API download

The official Minecraft launcher supplies the required Java 25 game runtime. The mod is client-only. Updates are manual: replace the JAR while Minecraft is closed.

Validation and beta status

Seven unit tests passed. An isolated local game test exercised ore/chest scanning, removed markers, through-wall visibility, zoom and brightness restoration, menu/cursor handling, a mouse-operated slider, saved filters and world re-entry. Actual game screenshots were inspected. The initial standalone repository preserves those tested gameplay classes byte-for-byte.

This is a prerelease: acceptance in a normal installed Fabric profile remains pending. Shader packs, Sodium/Iris, Vulkan, other operating systems and multiplayer compatibility have not been tested. See TESTING.md.

The download includes the mod JAR, complete buildable source ZIP and SHA-256 checksums. Source and build scripts are licensed under GPL-3.0-only with dependency notices preserved. Only install the mod JAR and its Fabric API dependency, not the source archive.