CastAway

CastAway is a lightweight Minecraft mod for Fabric that prevents lava cast griefing by modifying the way lava and water interact. Specifically, it disables the automatic generation of cobblestone when lava meets water, thus breaking lava casts.

Key Features:

❌ Cobblestone generators no longer work.
✅ Stone generators continue to function as usual.
✅ Obsidian generation continue to function as usual.
✅ Modded fluid interactions remain unaffected unless involving a lava or water variant.

CastAway is ideal for servers where lava casts are problematic, offering a seamless solution without performance penalties.

How Lava-Water Interactions Work (Vanilla)

In vanilla Minecraft, when lava and water come into contact, the resulting block depends on several factors:

The type of lava (flowing or source).
The type of water (flowing or source).
The direction of interaction.

Interaction Table

Interaction	Resulting Block	Affected by CastAway?
Water → source lava	Obsidian	❌ Unaffected
Water → flowing lava	Cobblestone	✅ Replaced with flowing water
Lava → water (from above)	Stone	❌ Unaffected
Lava → water (others)	Cobblestone	✅ Replaced with flowing water

CastAway intercepts the interaction and replaces cobblestone with flowing water, preventing lava casts from forming while leaving other mechanics untouched.

Installation

Drop the CastAway .jar into your mods folder.
Start the server or enter the world — the mod is active immediately.

This mod operates server-side only, meaning clients do not need to install it.

Compatibility and Performance

CastAway uses a Mixin to intercept the call that generates a new block when lava interacts with water. It modifies the shouldSpreadLiquid method, which controls the formation of cobblestone during lava-water interactions.

✅ Affected:

Vanilla lava and water.
Modded fluids tagged as lava or water.

❌ Not Affected:

Fluids not tagged as lava or water (e.g., oil, molten metals, gases).
Manual cobblestone placement or non-fluid generation mechanics.
Custom fluid systems not using standard FluidBlock logic.

Documentation (2.0.0+)

enabled:
Enables or disables the mod.
Type: boolean Default: true
water_level:
Property that specifies the height of water on a scale of 1 to 7.
Type: integer Default: 1
water_falling:
Property that specifies if water is falling.
Type: boolean Default: false

Checks

CastAway performs the following checks in the config file:

Water Level Below 1:
Checks if the water level is below 1.
On Failure: Adjusts to 1.
Water Level Above 7:
Checks if the water level is above 7.
On Failure: Adjusts to 7.

Full Configuration Example:

{
  "enabled": true,
  "water_level": 1,
  "water_falling": false
}

Stone Generator (Working)

Alternative/Working Stone Generator

Cast Away