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# Dwarf Fortress Under the Hood: 3D Tile Sim, Job Queues & Connectivity Pathfinding
- URL: https://simstructures.com/dwarf-fortress-under-the-hood/
- Published: 2026-08-31T17:11:33.000Z
- Updated: 2026-08-31T21:48:19.000Z
- Description: Inside Dwarf Fortress: a single-dev custom C++ engine simulating a 3D tile world with 7-level fluids, a labor job queue, and A* short-circuited by a connectivity map.
- Author: ENGN GAME STUDIO LLC
- Tags: Dwarf Fortress, Articles

### Engine & Tech Stack

- **Engine / language:** a bespoke **C++** engine; the Steam release renders through **SDL** with tilesets (historically curses/OpenGL).
- **Map representation:** a **3D grid of tiles across z-levels**; every tile carries material, temperature and liquid state. The world is simulated at multiple scales, from worldgen down to the local embark.

### Core AI & Decision Making

- **Architecture:** agent-based dwarves with needs, personalities and a **thoughts/emotions** model: custom C++ logic rather than a formal behavior tree.
- **Dispatch:** tasks flow through a **labor/job queue**; enabled labors plus proximity and reachability decide who picks up which job.

### State Management & Data Architecture

- **Model:** object-oriented custom C++, historically **single-threaded**. Fluids use a **7-level flow** cellular automaton; temperature, wear and gas are all simulated.
- **Worldgen:** generates and simulates **centuries of history** (civilizations, wars and figures) before play begins.

### Tick Scheduling & Performance Tricks

- **Single main loop:** the classic FPS bottleneck is **pathfinding and item counts**, so expensive updates (temperature, wear) are throttled and spread out.
- **Reachability caching:** a connectivity map lets the game reject impossible destinations before running a full search.

### Pathfinding & Spatial Systems

- **Algorithm:** **A\*** over the 3D tile grid.
- **Spatial trick:** tiles are grouped into **connectivity node-groups**; if source and target aren't in the same group the path is rejected in O(1), avoiding wasted A\* over huge fortresses.