On-Demand Terrain Streaming
I built this workflow to turn real-world map data into terrain sectors in Unity, with a focus on speed, geospatial accuracy, and iterative world-building.
Problem
Large terrains are expensive to author and load manually. I needed a way to:
- Pick any location in the world.
- Preview and inspect tile boundaries interactively.
- Download synchronized color + elevation sources.
- Convert that data into optimized geometry for simulation use.
Doing this by hand was too slow and error-prone when building many sectors.
Approach
I created a Unity Editor tool that behaves like an interactive GIS panel inside the engine:
- Interactive map navigation: pan, zoom, and click to get precise latitude/longitude + tile IDs.
- Tile intelligence: 3x3 neighbor lookup, cache management, and parent/child tile fallback while streaming.
- Download pipeline: one-click export of satellite color + Terrain-RGB elevation tiles, plus metadata (
meta.json) with scale and geo-reference. - Data handoff: exported raster data is passed into a Houdini HDA workflow that converts height data into clean terrain geometry for downstream use in Unity.
This reduced world-building setup from a manual multi-tool process to a repeatable editor-driven pipeline.
Tools
- Unity EditorWindow (C#): custom interface, request queueing, tile cache, click-marker UX.
- Mapbox tiles: hybrid map rendering and terrain source acquisition.
- UnityWebRequest: asynchronous tile fetching and concurrent download management.
- Houdini Digital Asset (HDA): converts downloaded terrain maps into production-ready geometry.
- JSON metadata export: preserves geo alignment and scale for deterministic reconstruction.
Result
- Faster sector creation for large environments.
- Consistent geo-referenced outputs between map selection and generated terrain.
- Better iteration speed for simulation terrain prototyping.
- A reusable workflow that can scale from single-tile tests to multi-sector world expansion.