Gleam

A lightweight, client-side Fabric mod that renders a light overlay to show exactly where mobs can spawn.

Mob Spawn Overlay
Translucent red overlays indicate where monsters can spawn (block light 0).

Optimal Torch Placement
Translucent yellow markers show the most efficient locations for torch placement.

Features

Renders a translucent red overlay on blocks that are dark enough for monsters to spawn (block light level 0).
Optimal Torch Placement: Calculates efficient locations for torches, rendered as golden markers, based on a fixed world grid to maximize coverage with minimal torches.
Smart scanning only highlights valid spawn locations (solid blocks with air above them).
Configurable Visibility Modes: Toggle (default), Hold or Always Show.
Performance-friendly, throttled area scanning to maintain high framerates.
Fully client-side; works perfectly on multiplayer servers.

By default, press F7 to toggle the light overlay on and off. You can change this behavior to “Hold” or “Always” in the configuration menu.

The keybind can be changed in the vanilla Minecraft controls menu under the “Misc” category.

Gleam supports ModMenu for in-game configuration. You can also manually edit the config/gleam.json file.

Available settings:

Visibility Mode: Choose how the overlay is shown (Hold key, Toggle with key or Always).
Optimal Torches: Toggle the display of golden markers showing the most efficient locations for torch placement. These are fixed to a stable world grid and will not shift around as you move.
Horizontal Radius: The horizontal distance scanned around the player for dark blocks.
Vertical Radius: The vertical distance (up and down) scanned around the player for dark blocks.

This project is licensed under the GNU General Public License v3.0 (GPL-3.0).