Mob Spawn Indicator

By
Fn0

Highlights block surfaces where hostile mobs can spawn using color-coded overlays.

Preview 2

Description

Mob Spawn Indicator highlights valid mob spawn floors in your vicinity with color-coded overlays. It uses vanilla spawn rules, so it works on any server without needing to be installed server-side.

Features

Color-coded overlays on valid spawn floors: red (danger), yellow (warn), green (safe)
Configurable render distance, opacity, and which colors to display
Settings GUI accessible from the Options screen or via commands
Client-side only — works on vanilla servers, SMPs, and modded servers

Commands

/msi settings — open the settings GUI
/msi toggle — toggle the overlay on/off
/msi on | /msi off — enable or disable the overlay
/msi reset — reset all settings to defaults

Configuration

Default keybind: J (toggle overlay)

Config file: config/msi-common.toml

Option	Default	Description
`render_rad`	16	Render distance in blocks
`overlay_opacity`	0.5	Overlay transparency
`show_danger`	true	Show red overlay (valid spawn, no space for mobs)
`show_warn`	true	Show yellow overlay (valid spawn, 1 block space)
`show_safe`	false	Show green overlay (valid spawn, 2+ block space)

Notes

Uses vanilla Minecraft spawn rules: slabs, stairs, trapdoors, glass, and leaves are correctly excluded as non-spawnable
Overlays update every 5 ticks
Works in singleplayer, LAN, and multiplayer

The Mob Spawn Indicator Team

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