Genre: Survival

Resource scarcity, needs management, and progression through crafting define survival games.

NEVER Do (Expert Anti-Patterns)

Physiology & Needs

• NEVER use constant "Needs" decay; strictly scale with activity (e.g., Sprinting drains hunger 3x faster than idling).
• NEVER use Instant Death for starvation/dehydration; strictly trigger gradual HP drain and provide distinct visual/audio warnings.
• NEVER use float timers for exact life-critical checks; strictly use is_equal_approx() or <= to prevent 0.0 precision misses.
• NEVER represent world time/day cycles within UI scripts; strictly use an AutoLoad (Singleton) to decouple state from visuals.

Gathering & Inventory

• NEVER make gathering tedious without progression; strictly implement Tiered Tool Scaling (e.g., Stone Axe = 1 wood/hit, Steel Axe = 5 wood/hit) to reward technical advancement.
• NEVER allow infinite inventory stacking; strictly use Weight Capacity or strict Stack Limits (e.g., 64 items) to force strategic resource management.
• NEVER force players to "Guess" crafting recipes; strictly use a Discovery System where recipes unlock upon acquiring materials.
• NEVER forget to duplicate(true) a shared Resource (like Item Durability); otherwise, all instances will break simultaneously.
• NEVER store heavy item/crafting definitions in Node properties; strictly use custom Resource containers for lightweight data.

World & Performance

• NEVER spawn threats at Respawn Points; strictly enforce a Safe Zone radius (Beds/Spawn) where enemy spawning is prohibited.
• NEVER instance 10,000 individual MeshInstance3D nodes for foliage; strictly use MultiMeshInstance3D for batched draw calls.
• NEVER load massive world chunks synchronously; strictly use ResourceLoader.load_threaded_request() to prevent hitches.
• NEVER save complex dictionaries to standard text files; strictly use binary serialization for speed and size efficiency.
• NEVER run procedural terrain/noise algorithms on the main thread; strictly offload to the WorkerThreadPool.
• NEVER hardcode massive crafting tables in GDScript; strictly use ConfigFile or JSON for easy balancing and modding.

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🛠 Expert Components (scripts/)

Original Expert Patterns

• inventory_slot_resource.gd - Data-driven inventory slot model using Resources for seamless serialization and durability tracking.
• survival_patterns.gd - 10 Essential Survival Expert Patterns (Decay scaling, Environment tweens, MultiMesh optimization).

Modular Components

• interactable.gd - Universal interface for harvesting, picking up items, and world triggers.
• inventory_data.gd - Core business logic for grid-based inventories and stacking.
• inventory_slot_data.gd - Lightweight data container for UI-to-Logic inventory communication.
• inventory_data.gd - High-performance Resource-based storage with stack limits and metadata support.
• inventory_data.gd - Master item definition for weight, stack-size, and consumption effects (Resource-based).

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Phase	Skills	Purpose
1. Data	resources, custom-resources	Item data (weight, stack size), Recipes
2. UI	grid-containers, drag-and-drop	Inventory management, crafting menu
3. World	tilemaps, noise-generation	Procedural terrain, resource spawning
4. Logic	state-machines, signals	Player stats (Needs), Interaction system
5. Save	file-system, json-serialization	Saving world state, inventory, player stats

Architecture Overview

1. Item Data (Resource-based)

Everything in the inventory is an Item.

# item_data.gd
extends Resource
class_name ItemData

@export var id: String
@export var name: String
@export var icon: Texture2D
@export var max_stack: int = 64
@export var weight: float = 1.0
@export var consumables: Dictionary # { "hunger": 10, "health": 5 }

2. Inventory System

A grid-based data structure.

# inventory.gd
extends Node

signal inventory_updated

var slots: Array[ItemSlot] = [] # Array of Resources or Dictionaries
@export var size: int = 20

func add_item(item: ItemData, amount: int) -> int:
    # 1. Check for existing stacks
    # 2. Add to empty slots
    # 3. Return amount remaining (that couldn't fit)
    pass

3. Interaction System

A universal way to harvest, pickup, or open things.

# interactable.gd
extends Area2D
class_name Interactable

@export var prompt: String = "Interact"

func interact(player: Player) -> void:
    _on_interact(player)

func _on_interact(player: Player) -> void:
    pass # Override this

Key Mechanics Implementation

Needs System

Simple float values that deplete over time.

# needs_manager.gd
var hunger: float = 100.0
var thirst: float = 100.0
var decay_rate: float = 1.0

func _process(delta: float) -> void:
    hunger -= decay_rate * delta
    thirst -= decay_rate * 1.5 * delta
    
    if hunger <= 0:
        take_damage(delta)

Crafting Logic

Check if player has ingredients -> Remove ingredients -> Add result.

func craft(recipe: Recipe) -> bool:
    if not has_ingredients(recipe.ingredients):
        return false
        
    remove_ingredients(recipe.ingredients)
    inventory.add_item(recipe.result_item, recipe.result_amount)
    return true

### 4. Tiered Tool Scaling
Scaling resource yield with tool quality (`item_data.gd` metadata):
- **Stone Axe**: 1 yield per hit, 3s harvest time.
- **Steel Axe**: 5 yield per hit, 1.5s harvest time.
- **Auto-Saw**: Constant yield stream while within proximity.

### 5. Spawn Safe Zones
Preventing "Spawn Camping" via check:
```gdscript
func get_spawn_point() -> Vector3:
    var point = find_random_point()
    for bed in get_tree().get_nodes_in_group("player_beds"):
        if point.distance_to(bed.global_position) < safe_radius:
            return get_spawn_point() # Re-roll
    return point

## Godot-Specific Tips

*   **TileMaps**: Use `TileMap` (Godot 3) or `TileMapLayer` (Godot 4) for the world.
*   **FastNoiseLite**: Built-in noise generator for procedural terrain (trees, rocks, biomes).
*   **ResourceSaver**: Save the `Inventory` resource directly to disk if it's set up correctly with `export` vars.
*   **Y-Sort**: Essential for top-down 2D games so player sorts behind/in-front of trees correctly.

## Common Pitfalls

1.  **Tedium**: Harvesting takes too long. **Fix**: Scale resource gathering with tool tier (Stone Axe = 1 wood, Steel Axe = 5 wood).
2.  **Inventory Clutter**: Too many unique items that don't stack. **Fix**: Be generous with stack sizes and storage options.
3.  **No Goals**: Player survives but gets bored. **Fix**: Add a tech tree or a "boss" to work towards.


## Reference
- Master Skill: [godot-master](../godot-master/SKILL.md)