ramp(t: number, a: number, b: number) → number

0 at or before `a`, 1 at or after `b`, linear between. The workhorse: every ramp in this film is written as `Film.ramp(t, BEAT.X, BEAT.Y)`.

smooth(t: number, a: number, b: number) → number

The same, eased so a physical quantity does not start and stop with a corner.

spike(t: number, at: number, fall: number) → number

A one-shot spike: 0 before `at`, 1 at `at`, decaying to 0 over `fall`.

shotAt(t: number) → void

actAt(t: number) → string

shotTime(t: number) → number

Seconds since the live shot's first frame.

seaLevel(t: number) → number

ONE function owns the water height for the whole film, because the shore, the camera and the sound all have to agree about where the sea is on any frame.

loadStages( ) → void

(Re)require every stage module. Called lazily, and again by `reloadStages` after a slice edits its module.

reloadStages( ) → void

stageKeys( ) → void

apply(dt: number) → void

Put every stage into the state film time `Film.t` describes.

reset( ) → void

advance( ) → void

Advance one rendered frame. The director calls this and nothing else does.

seek(t: number) → void

Re-derive the frame that `t` would have produced, without running the clock through to it. This is how you author a shot without watching the 48 seconds in front of it.

play(from: number?) → void

pause( ) → void

resume( ) → void

finished( ) → boolean

status( ) → void