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usage() — retrieves the current billing/quota state (recording allowed,
activity usage, plan, renewal) for your account.
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activityTypes() (Swift and TypeScript) / client.activity_types.list() (Python) — the
activity types this account can use: the ones everybody has, plus any the account or its
organisation added. Read one from here to filter a list by it.
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slug on ActivityTypeInfo — a machine-readable key, e.g. "squat_exercise". Derived
from the name once and then fixed, so it survives a rename while name and
displayName/display_name follow one. Empty when none was reported.
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switchSubject(to:in:) (Swift) / switchSubject(subject, session) (TypeScript) /
switch_subject(subject, session) (Python) — moves to the session to record another
subject in, and takes the cameras there. Subjects can be recorded in any order, including
returning to one recorded earlier: the session they were already in comes back when its
camera calibration and static pose are both still good, so their pose is not repeated.
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setExternalClock(_:) on View3DController (Swift) and the externalClock prop on
View3D (TypeScript) — hands the 3D view's clock to a clock of your own, such as a
playing video's. Playback then never advances on its own and seek is the only thing
that moves the current time; it is safe to call once per video frame.