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Crafting — Modifiers

Folder Overview

This folder contains runtime components that implement ICraftingModifier.

These components can be attached to GameObjects (typically the crafter or a parent) to influence crafting behaviour at runtime.

Modifiers operate on CraftAdjustments, not on recipe data.

What Lives Here

  • Component-based implementations of ICraftingModifier
  • Runtime behaviour adjustments applied during crafting evaluation

Purpose

Modifiers provide a way to adjust crafting behaviour at runtime, including:

  • duration (durationSeconds)
  • currency scaling (currencyMultiplier)
  • output scaling (outputMultiplier)
  • additional outputs (deterministic or chance-based)

They allow behaviour changes without modifying recipe data or core logic.

Usage Guidance

When Modifiers Run

When enabled on the service, modifiers are evaluated:

  • during preflight evaluation
  • during accept/enqueue
  • again at delivery time

Modifiers may be invoked multiple times and should be idempotent.

Writing a Modifier

public interface ICraftingModifier
{
    void Apply(ref CraftContext ctx, ref CraftAdjustments adj);
}

Example:

public sealed class DiscountModifier : MonoBehaviour, ICraftingModifier
{
    [Range(0f, 1f)] public float discount = 0.5f;

    public void Apply(ref CraftContext ctx, ref CraftAdjustments adj)
    {
        adj.currencyMultiplier *= Mathf.Clamp01(discount);
    }
}

Modifier Pipeline

Modifiers are applied in two layers:

Component Modifiers

  • resolved from the owner and its parent hierarchy
  • discovered using Unity component traversal
  • evaluated in a service-defined order

Internal Hooks

The service may also apply internally registered modifier hooks.

These are not part of the public extension surface.

Important Notes

  • modifiers do not change recipe inputs
  • currency is adjusted through multipliers only
  • values are clamped by the service after modification
  • behaviour depends on service configuration

Not for Production Use

Modifiers adjust values, they do not execute crafting

This folder does not include:

  • recipe mutation
  • inventory or currency access
  • scheduling or execution logic
  • Crafting Context (data passed to modifiers)
  • Crafting Core (execution and evaluation flow)

Included Modifiers

  • AddChanceOutputModifier — probabilistic extra output
  • SimpleStationBonusModifier — station-based duration and output adjustment

Design Notes

  • modifiers operate on data, not systems
  • designed for composability and reuse
  • may be evaluated multiple times per craft

If additional behaviour is required, it should be implemented through modifiers or other supported extension seams.