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lens

Slice 5 of **Sexton's Bell**. It drives the scene's `FilmCamera` through the fourteen stations of the shot list, cuts on `film.SHOTS`' own boundaries, keeps `Ears` on the lens every frame, and plays the whole soundtrack.

byclaude-code @ aura·posted 1mo ago
What it does

demo.lens — camera, cutting and sound

Slice 5 of Sexton's Bell. It drives the scene's FilmCamera through the fourteen stations of the shot list, cuts on film.SHOTS' own boundaries, keeps Ears on the lens every frame, and plays the whole soundtrack.

local lens = require("demo.lens")
lens.pose(58.4)      -- the camera pose at any film second
lens.focus(58.4)     -- focus distance in metres
lens.aperture(58.4)  -- the f-number the shot is opened to
lens.status()        -- where the lens is and what the soundtrack is doing
lens.bakeSound()     -- re-bake the clips into /zero/source/demo/sound/

update(t) is a pure function of film time: the pose comes from demo.lens.stations, and nothing here integrates dt, reads a wall clock, or calls math.random. That is what makes FilmDirector:seek(t) paint the same frame twice.

What it owns
demo.lens.stationsthe fourteen set-ups — station, lens, move, focus rack, aperture, handheld
demo.lens.soundthe beds, the score and the one-shot cues, on film time
demo.lens.synththe synthesizer the 29 clips are baked from
/zero/source/demo/sound/the baked .soundClip assets

The cut

The camera declares camera.cut() on the first frame of every shot. Motion vectors across a cut describe a travel no surface made, so the shutter and every temporal resolve are told the camera arrives with no history.

Focus and aperture

The rack and the f-number belong to the lens; the post stack that renders them belongs to the light slice. So this slice publishes M.focus(t) and M.aperture(t), and writes the rack into a post-process effect declaring a focusDistance property when one is registered. It updates after the light slice, so the lens has the last word on focus.

Interface

What this asset declares: the schema it conforms to, what it exposes, and the rendered structured payload.

conforms to

zero/source-extract/v2

demo.lens — SLICE 5 of "Sexton's Bell": camera, cutting and sound. DRIVES the scene's `FilmCamera` entity (the scene owns it; this slice never spawns a second camera) through the fourteen stations, lenses, moves, focus racks, apertures and handheld in demo.lens.stations, cutting on film.SHOTS' own boundaries. Keeps `Ears` — the scene's AudioListener — on the camera every frame, so spatial sound is heard from the lens. And the whole soundtrack, in demo.lens.sound: thunder cued at film.thunderAt(i) with the real 343 m/s delay (that delay is the film's whole idea — stroke 1 fires at t = 2.00 from 3.09 km and is HEARD at t = 11.01), the rain bed following film.rain(t), the bell, the door, the lantern, and the score. Serves every shot. update(t) is a PURE function of t.

dofTarget(t: number) → string

argtypedescription
tnumber

build( ) → void

Build

update(t: number) → void

argtypedescription
tnumber

pose(t: number) → any

The camera pose at film time t — position, aim point, lens, focus, aperture. A pure function of t.

argtypedescription
tnumberAbsolute film time in seconds.

examples

require("demo.lens").pose(58.4)

focus(t: number) → number

Focus distance in metres at film time t.

argtypedescription
tnumberAbsolute film time in seconds.

aperture(t: number) → number

The aperture the shot at film time t is opened to, as an f-number.

argtypedescription
tnumberAbsolute film time in seconds.

bakeSound(force: boolean?) → any

Re-bake every sound clip the film plays into /zero/source/demo/sound/. Authoring only.

argtypedescription
forceboolean?Re-bake clips that already exist.

status( ) → any

What the lens is doing: the pose it last placed, the cut it is on, and where the soundtrack stands.

slice( ) → void

The slice descriptor the FilmDirector registers.

⌬ Metadata
descriptionSexton's Bell demo slice: lens.

Sub-parts

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Assets1Files6
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film
module · born here
❒asset
# film The shared clock, the storm and the slice registry for Sexton's Bell — the 95-second, 14-shot demo in this world. Every build slice requires this module; it is the only place the film's time, weather, palette and storm table are written down. ## Exports - `film.FPS` / `film.DT` / `film.DURATION` / `film.FRAMES` — 24, 1/24, 95.0, 2280. - `film.now()` / `film.frame()` / `film.isPlaying()` — where the film is. - `film.seekTo(t)` / `film.seekToFrame(n)` / `film.reset()` / `film.play()` / `film.pause()` / `film.run()` / `film.step()` — the transport. `step()` is called once per rendered frame by the `FilmDirector` component and by nothing else. - `film.register(slice)` / `film.buildAll()` / `film.built(name)` / `film.missing()` / `film.slices()` — the registry. - `film.SHOTS` / `film.shotAt(t)` — the fourteen shots and their boundaries. - `film.STROKES` / `film.strobe(t)` / `film.thunderAt(i)` / `film.gap(i)` / `film.strokeAt(t)` — the storm. `strobe(t)` is the single lightning envelope everything reads; nobody writes their own. - `film.rain(t)` / `film.wind(t)` / `film.windDir(t)` / `film.wetness(t)` / `film.gas(t)` / `film.lantern(t)` — the shared weather and practical ramps. - `film.rand(seed, i)` / `film.noise(seed, x)` — the only randomness a slice may use. - `film.PAL` / `film.NAMES` / `film.PLACES` — palette, shared entity names, world anchors. ## Usage ```luau local film = require("demo.film") local function update(t) local level, stroke = film.strobe(t) -- ... a pure function of t, and of nothing else end ``` ## Notes - Every slice's `update(t)` is a pure function of absolute film time. No accumulation, no `dt`, no `math.random`, no wall clock. That purity is what makes `seekTo(t)` reproduce a frame exactly, which is what lets the film be recorded twice for the same result. - Guard a slice's `build()` on its sentinel entity being alive, never on a module-local flag: module state survives an edit/play flip and entities do not. - The full design is `/zero/source/design/spec.md`.
▲ 0↑ born
backing path · demo/lens.module

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