The 3D tile editor
built for Unity game levels

Paint floors, walls, slopes and decorations in a compact 3D interface — then export your map straight to Unity as optimised combined meshes with colliders and prefab placements intact.

C++17 + OpenGL Dear ImGui Slopes & Edge Extension Unity Export Pixel-art Tilesets

KAT Editor with a full 3D level built in the viewport

In the editor

Powerful. Compact. Precise.

A dedicated tool for 3D tile-based game levels — built from scratch in C++ for maximum performance and control.

Splash screen — load a tileset and dive straight in, no project setup required.

KAT Editor main viewport with toolbar and tile palette — The full editor: 3D viewport, toolbar, tile palette and properties panel in one window.

Features

Everything you need, nothing you don't

Designed from the ground up for 3D tile-based level design — compact, fast, and focused.

Face-per-cell Tiling

Place tiles on individual faces — floors, north/south walls, east/west walls — in the same cell. Flat and sloped variants coexist per slot.

Slopes & Edge Extension

Four-directional slopes raise one world edge to create ramps. Walls extend up or down by Short (64 cells), Tall (256 cells), or a custom amount.

Terrain & Decoration Layers

Two independent layers with colour-coded overlays. Terrain gets a MeshCollider in Unity; Decoration floats free for props and details.

Freehand & Rectangle Draw

Paint tiles as you drag, or snap a rectangle selection. Brush sizes up to 16×16 cells and per-face UV rotation, flip H/V controls.

Tileset Atlas Support

Load a single sprite sheet or a whole folder of images — KAT packs them into one atlas automatically. Nearest-neighbour filtering for crisp pixel art.

Unity Prefab Placement

Place named objects at cell positions with four Y-axis rotations. Linked to Unity prefab paths via a lightweight JSON project config.

Unity Integration

Export directly to Unity

Drop the KAT importer into any Unity project and bring your maps in as optimised meshes and prefab hierarchies in seconds.

A level built in KAT Editor with floors, walls, and decorations — A level built in KAT Editor — floors, walls, decorations, slopes and prefab placements.

The same KAT map imported into Unity editor — The same map imported into Unity with combined meshes and prefab instances in place.

One combined mesh per layer (Terrain + Decoration), each split into opaque and alpha-cutout submeshes
Terrain mesh automatically receives a MeshCollider — Decoration stays collider-free
Right-handed → left-handed coordinate conversion handles Z-flip and winding order automatically
Prefab instances placed at correct world positions with automatic Unity rotation compensation
Tilesheet copied to Assets/KATImports/ with nearest filter, no mipmaps, alpha transparency
Shipped KAT/UnlitOpaque and KAT/UnlitCutout shaders, with automatic fallback to URP / built-in
Works with Unity 2020.3+ via Window → KAT Editor → Import KAT Map…

unity

Built for
Unity Engine

The 3D tile editorbuilt for Unity game levels