# 0009: MotionScan-Equivalent Interrogation via MetaHuman

Status: Accepted

Date: 2026-05-25

## Context

The Period Vice Squad path needs readable facial tells and interrogation
performance quality comparable to classic scan-based detective games, while V5
must use a maintainable UE5.5-compatible pipeline.

## Decision

V5 implements the MotionScan-equivalent pipeline through MetaHuman capture,
high-fidelity facial solve data, performance clips, tell annotations, and
interrogation scoring assets.

## Capture Stage Requirements

- The face stage uses a calibrated 12-camera capture volume and records
  MetaHuman-compatible facial performance solves as 60 fps USD blendshape
  stacks.
- Every principal actor receives a 16-hour FACS calibration session before
  production takes. Calibration covers neutral, range, asymmetry, and fatigue
  passes for the required action-unit groups.
- Each tell take must carry actor id, voice-line id, tell type, USD take id,
  trim frames, blend-in/out frames, blend weight, and the Sequencer section id
  that owns playback in cinematic review.
- The quality gate rejects takes that miss minimum frame count, 60 fps capture
  rate, required FACS coverage, or valid trim ranges. Failed takes enter the
  retake pipeline with a quality-gate reason tag.
- VO sync accepts full lipsync playback only when the trimmed facial duration
  and voice duration are within 250 ms.

## Consequences

- Facial-capture content targets MetaHuman-compatible runtime playback.
- Interrogation scoring keys off authored tell metadata.
- The pipeline remains compatible with Sequencer and cinematic review tooling.