VaCuus renders your game's interface from HTML and CSS documents — menus, HUDs and in-world panels — on its own UI thread. Layout, styling and draw-command recording all happen away from the game thread, which only enqueues input and reads back a snapshot: at the plugin's own 1,732-node reference HUD, that costs the game thread about 0.01 ms per frame. Measured, not estimated — the perf guide with the full budget table ships in the package, and every number in it is re-runnable on your machine.

Features:

• UI runs on a dedicated thread: game thread pays ~0.01 ms/frame even at the 1,732-node reference HUD (measured; budget table ships in the package)

• HTML/CSS authoring (.rml/.rcss, vendored RmlUi 6.x) with live reload in PIE and at runtime — no editor asset, no recompile

• Data binding straight from `UPROPERTY` fields, Blueprint- and C++-friendly

• Screen-space UMG widget and in-world panel component

• Optional JavaScript (vendored QuickJS-ng) and a TypeScript/Preact workflow

• Ships for AI-agent workflows: AGENTS.md at package root, agent guide, generated RCSS support matrix, log-first diagnostics, headless render recipe

• 227-test automation suite ships in the package (source and fixtures, on purpose)

• Localization support incl. live language switch; IME on desktop platforms

• Cross-platform from one source tree: Windows, macOS, Linux, Android and iOS supported; consoles on request

Code Modules: 1

Number of Blueprints: 0

Number of C++ Classes: 10

Network Replicated: Yes

Supported Development Platforms: Win64, Mac, Linux

Supported Target Build Platforms: Win64, Mac, Linux, Android, iOS, HTML

Documentation: https://vacuus.ufna.dev