Null Field Emitters

Null Field Emitters adds three placeable field generators that prevent Sophisticated Backpacks magnet upgrades from collecting dropped items and experience within a configurable area.

The mod is designed for workshops, storage rooms, farms, Create factories, public server areas, and any other location where player magnets interfere with item transport or automation.

Features

Three progressively larger field emitters
Block-aligned cubical protection areas
Configurable range for every tier
In-world range visualization
Full Sophisticated Backpacks magnet compatibility
Normal item pickup remains functional
Hoppers, belts, funnels, chutes, importers, and other automation remain functional
Recipes appear in the vanilla recipe book
Recipes are automatically visible in JEI when JEI is installed
All emitters appear in the Functional Blocks creative tab
Works in single-player and on dedicated servers

Emitters

Emitter	Default Range	Total Protected Area
Null Field Emitter	16 blocks in each direction	33 × 33 × 33
Resonant Null Field Emitter	64 blocks in each direction	129 × 129 × 129
Quantum Null Field Emitter	256 blocks in each direction	513 × 513 × 513

The emitter itself occupies the center block. A range of 16 therefore protects the emitter block plus 16 blocks in every direction along the X, Y, and Z axes.

The complete cubical area is protected, including its corners.

Range Display

Right-click an emitter to display the boundary of its active field.

The display includes:

The outer edges of the protected cube
Center guide lines
Boundary markers aligned with blocks
A distinct color for each emitter tier

Sneak-right-click the emitter to hide the range display.

The preview is client-side and does not change the field itself.

Configuration

The default ranges can be changed independently through the Forge server configuration.

Configuration file:

<world folder>/serverconfig/nullfield-server.toml

Default settings:

[ranges]
nullFieldEmitter = 16
resonantNullFieldEmitter = 64
quantumNullFieldEmitter = 256

Each range can be set from 1 to 4096 blocks.

Existing placed emitters use the current configured value, so they do not need to be broken and replaced after changing the configuration.

Forge-compatible configuration menu mods may also expose these settings in-game.

Recipes

The recipes use only vanilla Minecraft and Sophisticated Backpacks components.

Null Field Emitter

Requires:

4 Magnet Upgrades
2 Eyes of Ender
1 Upgrade Base
1 Obsidian
1 Redstone Block

Resonant Null Field Emitter

Requires:

4 Advanced Magnet Upgrades
2 Amethyst Blocks
2 Diamonds
1 Null Field Emitter

Quantum Null Field Emitter

Requires:

4 Resonant Null Field Emitters
4 Eyes of Ender
1 Diamond

Install JEI to view the exact shaped recipes in-game, or unlock them through the vanilla recipe book.

What the Field Blocks

Null Field Emitters stop remote magnet collection performed through Sophisticated Core.

They do not disable:

Normal player pickup when walking over an item
Hoppers
Create belts
Funnels
Chutes
Mechanical arms
Refined Storage importers
Other ordinary item transportation systems

This allows automation to continue working while preventing a nearby player's backpack magnet from stealing items.

Requirements

Minecraft 1.20.1
Minecraft Forge
Sophisticated Core
Sophisticated Backpacks

Both the client and server must have the mod and its required dependencies installed.

Optional Compatibility

Just Enough Items displays all crafting recipes automatically.
Forge config-screen mods can expose the server configuration through an in-game interface.

Neither is required.

Installation

Install Forge for Minecraft 1.20.1.
Install Sophisticated Core.
Install Sophisticated Backpacks.
Place Null Field Emitters in the mods folder.
Install the same mod version on the server and all connecting clients.

Modpack Use

You may include Null Field Emitters in public or private modpacks, provided the mod is distributed through its official CurseForge project or another officially approved distribution page.

Default ranges may be changed to fit the progression and scale of your modpack.

Issues and Feedback

When reporting a problem, include:

Minecraft version
Forge version
Null Field Emitters version
Sophisticated Core version
Sophisticated Backpacks version
The latest log or crash report
Steps needed to reproduce the issue

Null Field Emitters was created to solve a specific automation problem: magnets are useful almost everywhere, but sometimes dropped items need to stay exactly where they are.