Dimension Separator
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Minecraft Forge mod (1.20.1) for modpack makers — restrict which mods can interact with which dimensions. Block mob spawning, loot tables, world generation and item usage per dimension via a simple JSON config.
Forge is a popular mod loader for versions 1.1+ of Minecraft.
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CurseForge
Modrinth
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Runs entirely on the server. Also works in singleplayer.
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Description
Dimension Separator
This mod is created to separate what can appear in wich dimension. Tested on Minecraft 1.20.1 with Forge 47.1.3+.
What does it do?
I wanted to make a RP server where all the "magic" was forbiden in the overworld for lore purposes but I struggled to prevent some structures to appear in the overworld while still be in my custom dimension.
So I tried to create a mod to help me just do that.
It's still in testing but you can use a simple json config to tell the mod what exactly you want to let appear in wich dimension.
For each dimension, you can blacklist or whitelist mod namespaces to block:
- World generation features (ores, plants, structures...)
- Mob spawning
- Loot tables (chests, mob drops...)
- Item usage (right-click on blocks, in the air, or on entities)
- Structure generation
Configuration
The config file is located at config/dimensionseparator.json.~~~~
Here is an example :
{
"dimensions": {
"minecraft:overworld": {
"mode": "blacklist",
"bypassLevel": 2,
"namespaces": ["ars_nouveau", "iceandfire"],
"blacklistedIds": ["minecraft:zombie"],
"whitelistedIds": ["ars_nouveau:bookwyrm_familiar"],
"features": true,
"mobs": true,
"loot": true,
"items": true,
"structures": true
}
}
}
Fields
| Field | Type | Description |
|---|---|---|
mode |
string | "blacklist" to block listed mods, "whitelist" to allow only listed mods |
bypassLevel |
int | Minimum operator level allowed to /summon blocked entities (-1 or absent = no bypass) |
namespaces |
string array | Mod IDs to block or allow depending on mode |
blacklistedIds |
string array | Specific IDs always blocked, regardless of mode (e.g. "minecraft:zombie") |
whitelistedIds |
string array | Specific IDs always allowed, regardless of mode (e.g. "ars_nouveau:bookwyrm_familiar") |
features |
boolean | Block world generation features (ores, plants...) from listed mods |
mobs |
boolean | Block mob spawning from listed mods |
loot |
boolean | Block loot tables from listed mods (chests, mob drops...) |
items |
boolean | Block item usage (right-click) from listed mods |
structures |
boolean | Block structure generation from listed mods |
Setting a category to false disables blocking for that category, even if the namespace is listed.
Known Limitations
/locateon a blocked structure will search indefinitely without result. This is vanilla Minecraft behavior when no matching structure exists in the dimension.- Client-side keybinds (e.g. opening a mod's GUI with a custom key) are not blocked — only right-click interactions are covered. In practice, opening an interface without being able to interact with the dimension is harmless.
- Item usage via custom keybinds is client-side and cannot be intercepted server-side.
Compatibility
This mod uses Mixins and event handlers and should be compatible with most Forge mods. If you encounter a conflict, please open an issue.
Issues & Contributions
Found a bug or have a suggestion? Open an issue on GitHub.
Dimension Separator
This mod is created to separate what can appear in wich dimension. Tested on Minecraft 1.20.1 with Forge 47.1.3+.
What does it do?
I wanted to make a RP server where all the "magic" was forbiden in the overworld for lore purposes but I struggled to prevent some structures to appear in the overworld while still be in my custom dimension.
So I tried to create a mod to help me just do that.
It's still in testing but you can use a simple json config to tell the mod what exactly you want to let appear in wich dimension.
For each dimension, you can blacklist or whitelist mod namespaces to block:
- World generation features (ores, plants, structures...)
- Mob spawning
- Loot tables (chests, mob drops...)
- Item usage (right-click on blocks, in the air, or on entities)
- Structure generation
Configuration
The config file is located at config/dimensionseparator.json.~~~~
Here is an example :
{
"dimensions": {
"minecraft:overworld": {
"mode": "blacklist",
"bypassLevel": 2,
"namespaces": ["ars_nouveau", "iceandfire"],
"blacklistedIds": ["minecraft:zombie"],
"whitelistedIds": ["ars_nouveau:bookwyrm_familiar"],
"features": true,
"mobs": true,
"loot": true,
"items": true,
"structures": true
}
}
}
Fields
| Field | Type | Description |
|---|---|---|
mode |
string | "blacklist" to block listed mods, "whitelist" to allow only listed mods |
bypassLevel |
int | Minimum operator level allowed to /summon blocked entities (-1 or absent = no bypass) |
namespaces |
string array | Mod IDs to block or allow depending on mode |
blacklistedIds |
string array | Specific IDs always blocked, regardless of mode (e.g. "minecraft:zombie") |
whitelistedIds |
string array | Specific IDs always allowed, regardless of mode (e.g. "ars_nouveau:bookwyrm_familiar") |
features |
boolean | Block world generation features (ores, plants...) from listed mods |
mobs |
boolean | Block mob spawning from listed mods |
loot |
boolean | Block loot tables from listed mods (chests, mob drops...) |
items |
boolean | Block item usage (right-click) from listed mods |
structures |
boolean | Block structure generation from listed mods |
Setting a category to false disables blocking for that category, even if the namespace is listed.
Known Limitations
/locateon a blocked structure will search indefinitely without result. This is vanilla Minecraft behavior when no matching structure exists in the dimension.- Client-side keybinds (e.g. opening a mod's GUI with a custom key) are not blocked — only right-click interactions are covered. In practice, opening an interface without being able to interact with the dimension is harmless.
- Item usage via custom keybinds is client-side and cannot be intercepted server-side.
Compatibility
This mod uses Mixins and event handlers and should be compatible with most Forge mods. If you encounter a conflict, please open an issue.
Issues & Contributions
Found a bug or have a suggestion? Open an issue on GitHub.
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