Custom World Height

Customize the height limits of Minecraft dimensions with simple commands. Create taller Overworlds, expand the Nether, or adjust the End to fit your world-generation needs.

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Features

• Change dimension height limits using commands.
• Supports the Overworld, Nether, and End independently.
• Saves settings automatically to a configuration file.
• Simple and lightweight implementation.
• Works through a configurable per-dimension height system.

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Commands

Set Height for Current Dimension

/customworldheight <height>

Set Height for a Specific Dimension

/customworldheight <height> <dimension>

Examples

/customworldheight 512
/customworldheight 512 overworld
/customworldheight 256 the_nether
/customworldheight 384 the_end

Supported dimensions:

• overworld
• the_nether
• the_end

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Height Behavior

Overworld

• Minimum Y: -64
• Maximum Y: (height - 65)

Example:

/customworldheight 512 overworld

Result:

Y = -64 to Y = 447

Nether

• Minimum Y: 0
• Maximum Y: (height - 1)

End

• Minimum Y: 0
• Maximum Y: (height - 1)

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Important Warnings

⚠️ Read carefully before using this mod.

Always Configure Height Before Creating a World

For best results, set your desired height before generating a new world.

Never Change Height While a World Is Loaded

Changing dimension height settings while playing can cause serious issues.

Restart Minecraft After Changing Height

After using the command:

1. Save and exit your world.
2. Close Minecraft completely.
3. Launch Minecraft again.

The new height settings will only apply correctly after a full restart.

Existing Worlds Are Not Compatible With Different Heights

Opening a world with a different configured height than the one it was created with may cause:

• Crashes
• Chunk errors
• World corruption
• Other unexpected issues

Creating a new world after changing height settings is strongly recommended.

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Configuration

The mod stores all height settings in:

.minecraft/config/custom-world-height.json

Settings are automatically saved whenever a height value is changed.

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How It Works

1. The mod loads its configuration file during startup.
2. Height values for each dimension are read from the config.
3. The /customworldheight command updates and saves these values.
4. Minecraft's dimension height calculations are overridden using Mixins.
5. After restarting Minecraft, newly created worlds use the configured height limits.

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Recommended Usage

1. Install the mod.
2. Launch Minecraft.
3. Set your desired height using the command.
4. Close Minecraft completely.
5. Restart Minecraft.
6. Create a new world.
7. Enjoy your custom-sized dimensions.

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Note

This mod modifies dimension height limits at a fundamental level. Following the setup instructions and warnings is essential to avoid compatibility and world-generation issues.