From LLM Prompts to Runtime-Validated Immersive Experiences: Constraint-Guided Co-Authoring, Behavioral Validation, and Multisensory Orchestration

Abstract

LLM-assisted authoring can accelerate immersive production, but a convincing output is not necessarily executable, behaviorally correct, or ready for public use. We present TholusOS, a system for co-authoring multi-user immersive experiences across dome projection, audio, lighting, participant phones, physical effects, media services, and a live scheduler. TholusOS separates creative generation from operational authority. A macro compiler derives an experience profile, temporal windows, a system-owned cue skeleton, and readiness requirements; the LLM fills only exposed creative fields. A micro compiler maps accepted moments through semantic anchors and modality lanes into synchronized runtime cues. Family-aware audits inspect progression, state transitions, action-consequence chains, service flow, and audience-perceptible outcomes. Cue timing contracts identify elements that are locked, narrowly adjustable, window-flexible, or optional, so repair remains proposal-only until review, application, and revalidation. Audience-readiness gates distinguish authoring, simulation, controlled participation, and production. We describe the implemented architecture, its uneven integration maturity, and a reproducible software snapshot, and define an evaluation protocol for authorial control, behavioral validity, multisensory timing, repair safety, and gate calibration. Executable Experience Grammar denotes a typed intermediate representation and transformation rules, not a formal language with proved soundness; liveReady is a software state rather than physical certification. This system report does not claim comparative or hardware-in-the-loop results not yet measured.

Parole chiave

• LLM-assisted authoring
• mixed-initiative authoring
• behavioral validation
• XR authoring
• multisensory orchestration
• runtime assurance
• human-in-the-loop repair

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BibTeX

@techreport{riccio_guarnieri_2026_tholusos,
  author = {Riccio, Dario and Guarnieri, Edoardo},
  title = {From LLM Prompts to Runtime-Validated Immersive Experiences: Constraint-Guided Co-Authoring, Behavioral Validation, and Multisensory Orchestration},
  institution = {the usual neXt S.r.l.},
  type = {Technical Report / Preprint},
  number = {Version 5},
  month = jul,
  year = {2026},
  url = {https://www.academia.edu/170244904/From_LLM_Prompts_to_Runtime_Validated_Immersive_Experiences_Constraint_Guided_Co_Authoring_Behavioral_Validation_and_Multisensory_Orchestration}
}