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[[section-context-and-scope]]
== Context and Scope

=== Business Context

The system is a self-contained single-player game. It has no server backend, no multiplayer, and no live service dependencies. Its communication partners are:

[cols="1,2,2" options="header"]
|===
| Partner | Inbound | Outbound
| Player (keyboard/mouse) | WASD, mouse, R (reset), Escape (pause), Space (jump) | Rendered 3D scene + HUD
| OSM data | Extracted building footprints, street geometry, elevation | Attribution string at runtime
| Filesystem | Engine content (`.uasset`, `.umap`), Blender sources (`.blend`), DEM GeoTIFF | Saved maps, screenshots, packaged build
|===

=== Technical Context

[cols="1,2,2" options="header"]
|===
| Channel | Protocol / Format | Purpose
| Keyboard + mouse | Enhanced Input (IA_*, IMC_Default) | First-person movement, look, jump, reset, pause
| Vulkan RHI | GPU rendering | Scene display at 60 FPS / 1440p
| FBX | Autodesk FBX (binary) | Blender→Unreal mesh and skeleton transfer
| GeoTIFF | 3DEP 1 m DEM | Terrain heightfield source
| OSM XML | Overpass API extract | Building footprint and street layout source
| Git / LFS | HTTPS to Gitea remote | Source control, binary asset storage
|===