2D Map Generator

Editor + runtime tool that generates 2D tile levels with three algorithms and auto-selected walls. Random Walk, Rooms + Corridors, Cellular Automata, sprite profiles, Scene-view live preview.

• Unity 6.2 or higher (the editor code uses EntityId; please confirm your minimum version)
• Editor + Runtime
• 4 scripts in the Tbox_2DMapGenerator namespace: LevelGenerator, LevelGeneratorTileSet, and two Editor scripts (LevelGeneratorEditor, LevelGeneratorTileSetEditorWindow)
• Uses the 2D Sprite package's UnityEditor.U2D.Sprites API for slicing
• No external dependencies
• Maximum grid: 1024 cells per side, 1,000,000 cells total
• Prefab-based spawning with SpriteRenderer sprite overrides

Building procedural 2D rooms usually means writing the generator, then hand-wiring every wall corner to the right sprite. 2D Map Generator does both. Pick a fill algorithm, link a Tile Set Profile, and the level appears in your Scene view with walls matched to the surrounding floor layout.

🎲 Three Generation Modes

• Random Walk with configurable walker direction, spawn and removal chances
• Rooms + Corridors with non-overlapping rooms joined by L-shaped corridors
• Cellular Automata with smoothing passes and automatic region connection
• The inspector shows only the settings for the active mode

⚡ Live Preview

• Regenerates in the Scene view as you change settings, seeds, prefabs or profiles
• Preview objects are not saved into your scene file
• Clears on entering Play Mode and rebuilds when you return
• Stops at 10,000 cells and keeps the last valid preview

🧱 Automatic Wall Placement

• Walls surround every floor, including diagonal-only corners
• Each wall stores an eight-neighbor floor mask
• Isolated single walls are converted to floor
• Falls back from exact mask to canonical mask to cardinal mask to directional sprite to Generic Wall

🎨 Tile Set Profile

• A ScriptableObject that stores sprite assignments for Base Wall, Floor, Generic Wall, Wall Up/Down/Left/Right and Wall Topology
• Several sprites per role are chosen at random
• Your template prefabs keep their hierarchy, colliders and sorting
• Editing the profile refreshes every linked generator

🔧 Tile Set Builder Window

• Open from Tools > 2D Map Generator > Tile Set Builder
• Import existing sliced sprites by dropping textures or sprites
• Visual 3x3 topology board with filter by mask, hex or direction (N, SE, NW)
• Floors tab with a gallery and a preview panel
• Sprite palette with a role drop-down per sprite
• Undo support on assignments

🎯 Exact Tile Sizing

• Sprite Render Size is set in world units
• Compensates for renderer scale
• Independent of texture Pixels Per Unit
• Prefab transforms and colliders are not changed

📂 Optional Grid Slicing and Prefab Baking

• Slice an atlas by cell size, offset, spacing and PPU
• Bake one prefab per assigned sprite into a dedicated folder
• Apply baked arrays to a LevelGenerator with Undo

🔒 Safety Limits

• Validates grid size, probabilities, room settings and prefab arrays before generating
• Clear console errors instead of silent failures
• Iteration and work caps prevent runaway generation

🌱 Fixed Seeds

• Reproduce the same layout on demand
• The previous random state is restored afterwards, so other systems are unaffected