🧱 3D Level Creation Tool for Unity

A powerful Unity Editor extension designed to simplify and speed up level creation by replacing manual object placement with an intuitive, grid-based workflow.
This tool enables artists and designers to create structured, randomized, and layered levels with ease — while supporting prefab grouping, procedural touches, and flexible editing tools.

---

🚀 Key Features

🧩 Grid System

• Customizable Grid Size — e.g., Cell Width = 2.5m
• Adjustable Y-axis grid movement to add height variation
• Supports multiple grid layers for complex 3D layouts

---

🧰 Prefab Management Panel

• Central panel for storing and organizing all level prefabs (e.g., floor tiles, props)
• Grouping System — combine multiple prefabs into a Group and randomize placement
• Create new prefab groups directly from selected prefabs
• Supports offsets and random offsets for varied positioning
• Define number of prefabs per cell (e.g., grass clusters, prop scatter)

---

🎨 Brush Tools

Flexible placement tools for different workflows:

• Single Placement → Place one prefab at a time
• Fill → Fill an entire grid area with a chosen prefab
• Brush → Paint prefabs freely across the grid
• Line → Draw prefab lines for fences, walls, etc.
• Erase → Toggle removal of prefabs from grid cells

---

🧭 Selection & Editing

• Select multiple grid cells or prefabs by layer or box selection
• Move, rotate, and scale selected prefabs while keeping grid alignment
• Support for vertical selection (↑ / ↓ to select in Y direction)
• Copy / Paste selected areas to reuse sections quickly

---

🗂️ Layer System

• Organize prefabs by layers
• Toggle visibility per layer for easy management
• Each layer acts as a separate editing context

---

🔁 Undo & Redo

Full support for Unity’s Undo/Redo system for safe experimentation.

---

💾 Saving & Loading

• Save and load grid level data
• Export data for external tools or procedural systems

---

✨ Future Plans (If Time Allows)

• Add procedural generation for specific tile types inspired by Tiny Glade and TileWorldCreator 4
• Procedurally select:
  • Edge walls
  • Corner walls
  • Top face walls

---

🧠 Implementation Notes

• Built entirely in Unity’s Editor using EditorWindows, SerializedObjects, and GUI/IMGUI
• Grid data stored in ScriptableObjects for easy saving/loading
• Prefab previews generated via AssetPreview.GetAssetPreview()
• Designed for extensibility — developers can add new brush types, placement rules, or randomization logic

---

🏗️ Installation

1. Copy the tool folder (including the Editor scripts) into your Unity project under Assets/.
2. Open the editor window from the menu: