Interactive simulation world models
Reactor Helios
Reactor Helios is a real-time world model session that streams live generated video into the browser and accepts commands while it runs. Unlike export-oriented world generators, Reactor is designed for live interactive experiences.
Overview
| Status | Live in Roamscape |
|---|---|
| Access | Runnable in Roamscape |
| Released | 2026 |
| Inputs | prompt, live commands |
| Outputs | real-time video stream |
| Best for | real-time world model demos, interactive entertainment, live prompt steering, AI-native experiences, real-time spatial media |
Why it matters
Reactor expands Roamscape beyond asynchronous world asset generation into live world model sessions. It is an early step toward AI-native interactive entertainment and real-time generated worlds.
Roamscape use
Live in Roamscape as a real-time world model lab at /live.
Strengths
- live video streaming
- prompt steering while running
- no infrastructure to manage from the app side
- strong fit for interactive AI experiences
Limitations
- not an export-oriented SPZ or mesh workflow
- session output is live rather than a saved 3D asset
- provider pricing and session limits should be monitored carefully
Sources
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NVIDIA · Reactor · SANA-Streaming
Real-time streaming video editing with a hybrid diffusion transformer, 24 FPS — try it live in your browser.