# Open work on Tera

Short, and only things that are decided but not done. Anything speculative belongs
in an issue, not here.

## Re-shoot the time-lapse films

The 18 product stills and both share cards were re-shot on 2026-08-22 at `2b2dd5c`
and are live. **The films were not.** `films.ts` in lumbridge-v4 records the tera
commit each reel was shot at, so a stale reel is visually stale and no caption edit
fixes it — check that commit against tera HEAD before assuming a reel is current.

What the reels predate: ACES tone mapping and the runtime PMREM environment rig; a
sea that reflects, with a swell normal map, Fresnel and sun glitter, in place of a
flat `MeshLambertMaterial` that had no specular term at all; a world-space sky dome
replacing the screen-space gradient, which at dusk painted the sunset band along the
*bottom* of the picture, under the board; terrain that casts shadows; a California
board with the Basin and Range, Death Valley, the Salton Sea and San Diego on it;
aircraft you can actually see; a rebuilt LA studio; the studio device hardware; and
a new UI chrome with a first-run flow.

```sh
npm run build
node scripts/brand-assets/films.mjs --frames 24   # rough cut first: ~20 s, and it is
                                                  # the cheapest way to find out a
                                                  # camera is pointed at the wrong thing
node scripts/brand-assets/films.mjs               # ~90 s per 180-frame film on the Radeon
```

Worth knowing before starting (the rest is in `~/.claude/skills/tera-capture`):

- Check the run prints the Radeon and not SwiftShader. The software path is ~15x
  slower — 22 minutes a film rather than 90 seconds — and it reports success.
- `hero-soma` is a different animal: `chrome: "bare"`, midnight to midnight, and a
  two-stage encode (a CRF 18 master, then 1440w CRF 28 and 960w CRF 30 delivered).
- **The hero camera is worth reconsidering.** Whole-board was tried and rejected
  because the edge of the terrain plate showed against the sky. That seam no longer
  exists: the sea now runs eighteen board spans and ends past the fog's far plane.
- After tuning the hero, run `npm run check:hero` in lumbridge-v4.
- `#onboarding-host` is in `FURNITURE.CLUTTER` now. Every *new* overlay has to be
  added there too, because a frame with a stray card in it still renders and still
  looks deliberate.
- Commit tera first, then re-run, so the manifest records a clean sha.

## The Bay Area board drops a frame in twenty, on desktop only

`bay-area.desktop.p95FrameIntervalMs` carries a **33.4 ms allowance and that is a
recorded defect, not a target.** The board renders a median frame in 16.7 ms and
drops roughly one frame in twenty: p50 16.7, p95 33.3, and 443–456 frame samples
in a window where every other cell returns 480.

It is desktop-only, and it is **not fill rate**: the mobile cell runs the *same*
2.26 M triangles at a comparable pixel count — 1.32 MP against desktop's 1.30 —
and holds 16.7 ms flat. The obvious suspect is the shadow map, which `stage.ts`
sizes **2048 on desktop and 1024 on handheld**, over what is now the heaviest
shadow-casting scene in the product.

**It is not a regression, and this was checked rather than assumed.** Measured at
the commit before the airports and bridges landed, with the same harness:
p95 33.3, p50 16.7, 443 samples, **2,771,606 triangles**. After that work:
p95 33.3, p50 16.7, 456 samples, **2,265,056 triangles** — the board got
506,550 triangles *lighter* while gaining SFO, both bridges and a surfaced
freeway. The stutter was simply invisible until `bay-area` became a measured
cell, which it had never been.

The allowance is there so the cell still guards the numbers that are healthy —
triangles, draw calls, and the mobile frame time — rather than sitting
permanently red and therefore permanently ignored. **Fix the stutter and put the
cap back to 16.7.** Start with the desktop shadow-map size and the shadow
frustum over the SF board; a 2048 map over 2.26 M triangles of casters is the
first thing to rule in or out.

## The aeroplane glyph is still larger than the Golden Gate

`GLYPH_MAX_SCALE` in `src/engine/flights.ts` is 52 and that is a mitigation, not
a cure. The glyph has a screen-space *floor* — never smaller than legible — which
scales by the distance to the **aircraft**, when what makes it look wrong is how
far the camera is from **what it is looking at**. At a whole-board pose those are
the same thing; at the Golden Gate chapter the bridge is two units from the camera
and the traffic is two thousand, so the floor fires hard on the aeroplane and not
at all on the bridge.

A ceiling of 52 was chosen because the raw scale at 1,160 units — the far end of
the orbit over the California corridor — is 51.0 at a 60-degree field of view, so
anything lower shrinks aeroplanes at a pose people actually use. (26 was tried
first and put the glyph at 0.0123 of the frame, against the 0.012 at which
`flights.ts` says the wings stop resolving.) 52 takes the worst case from about
two and a half times the bridge's main span down to about one and a half.

The complete fix is to clamp against the camera's focus distance rather than the
aircraft's, so the glyph collapses toward its authored size whenever the viewer
has zoomed in on something near, at any aircraft range. That is a signature change
through `glyphScale`, `tick` and their callers.