Keep the CCTV panel through Context isolation, and collapse through the panel chrome

Contacts and Space Missions switch CCTV off to isolate themselves and restore
it on the way out: the panel and its share preference now stay as they are for
that round trip, as they do for Clear selected data layers. The controls no
longer read the collapsed class before asking: the panel chrome tells a panel
the accordion folded from one whose saved state is closed.

The camera controls gate asserts the collapse, reopens CCTV from the right
rail before switching it back on, and runs a Contacts entry and exit with the
panel open.

DATA_SOURCES.md

@@ -1,13 +1,13 @@
 # Data Sources & Attribution
 
-God's Eye View's **code** is [MIT](LICENSE)-licensed. **The MIT grant covers the source code only — it does NOT extend to third-party data or visual assets.** Every third-party source keeps its own license and terms. This file documents the live and bundled data sources; bundled 3D-model provenance is recorded in [`public/models/README.md`](public/models/README.md).
+God's Eye View's **code** is [MIT](LICENSE)-licensed. **The MIT grant covers the source code only — it does NOT extend to third-party data or visual assets.** Every third-party source keeps its own license and terms. This file documents the live and bundled data sources. The bundled 3D models are the project's own procedural fleet models, MIT-licensed with the code ([`public/models/README.md`](public/models/README.md)).
 
 How to read this:
 
 - **The non-permissive datasets are carved out, not omitted.** Some bundled data (e.g. TeleGeography, CC BY-NC-SA) isn't MIT-compatible. Rather than hide it, we **bundle it with a clear license carve-out** so the app works out of the box — but it stays under the provider's terms.
 - **If your use doesn't fit a dataset's license, remove that dataset.** Most importantly: TeleGeography is **NonCommercial** — commercial users must delete it (or license it from TeleGeography). It's one self-contained folder.
 - **Attribution is shown in-app** and listed here. Keep it intact. The required Google/Cesium credit renders on the on-globe credit line (bottom-left, `#cesium-credits`), and every per-layer credit below is registered into the expandable **"Data attribution"** lightbox on that line (`src/data/dataCredits.js` → `viewer.creditDisplay.addStaticCredit`). Both stay visible in clean-view and recording modes.
-- **Bundled model attribution lives beside the model files.** [`public/models/README.md`](public/models/README.md) records each shipped model's creator, source, license, and modification status.
+- **The bundled 3D models are the project's own.** Every model under `public/models/` is a procedural fleet model generated by the project maintainers and covered by the repository's MIT license; [`public/models/README.md`](public/models/README.md) describes the set.
 
 ---
 

LICENSE

@@ -56,7 +56,6 @@ In short: the MIT grant does not extend to any third-party data. See
 DATA_SOURCES.md for the full per-source license + attribution summary, and
 remove any dataset whose terms don't fit your use.
 
-The 3D models under public/models/ are also third-party works and are NOT
-licensed under MIT. They remain under their individual licenses. See
-public/models/README.md for the author, source, license, modification notice,
-and attribution covering each model file.
+The 3D models under public/models/ are the project's procedural fleet
+models, generated from code by the project maintainers, and are covered by
+the MIT license above like the source code. See public/models/README.md.

README.md

@@ -60,7 +60,7 @@ Start with the included data sources, then add your own. Each layer is a separat
 - **📡 Contacts:** A 250 km roster of everything near your target — step through live aircraft and drop into any cockpit.
 - **🎯 Click-to-track anything:** Camera locks on, draws a fading trail, surfaces full metadata — and a tracked fire or vessel hands you off to the nearest live camera in one click.
 - **🖊️ Voice whiteboard:** Speak annotations onto the world — real boundary polygons, marks, and routes.
-- **🛫 3D hangar:** Real per-class aircraft models — 787, ATR-72, Citation, Bell 206, MQ-9 — and a tracked contact swaps from glyph to 3D model as you close in.
+- **🛫 3D fleet:** 121 procedural models drawn life size by type — airliners, business jets, helicopters, drones, ships, buses, trams and trains — and every contact swaps from glyph to 3D model as you close in.
 - **🎨 Reskin reality:** GLSL sensor looks over the normal globe — CRT, NVG, FLIR/thermal, Noir.
 - **🟩 Detection overlay:** Screen-space bounding boxes and IDs on everything in view.
 - **🎖️ Military HUD:** Tactical heads-up display with intelligence-style telemetry.

changelog.d/1702-cctv-nearest-same-camera.md

@@ -1,4 +0,0 @@
-- Keep the CCTV camera picked with NEAREST, from the camera list or by a scene
-  when it is the camera the view just moved to. The pick did not stick:
-  NEAREST's own flight, or the next pan, switched to another camera, so the
-  panel showed a camera nobody had picked (gekh, #1702).

changelog.d/1714-fleet-models.md

@@ -0,0 +1,8 @@
+- Draw every 3D model from the project's procedural fleet set: 121 models
+  (about 2 MB, MIT like the code) chosen per vehicle by type and drawn life
+  size, replacing the eight third-party aircraft models. Flights, Military
+  Flights and Local ADS-B pick a model by ICAO type, class and emitter
+  category; Vessels, Transit and Rail now draw models too, under the same 3D
+  toggle and distances, a ship at its AIS length and beam and a tram, bus or
+  train in its mode or category colour. The whole set loads once when a layer
+  starts (samehkhamis, #1714).

changelog.d/1715-vessel-typical-length.md

@@ -0,0 +1,3 @@
+- Draw a vessel whose feed sends no length at its ship type's typical size, so
+  a cruise ship or container ship no longer shows as its type's smallest model
+  (samehkhamis, #1715).

changelog.d/1723-cctv-panel-collapse-on-disable.md

@@ -0,0 +1,5 @@
+- Collapse the CCTV panel when the layer is switched off. It stayed open with
+  an empty frame and a meta line that still described the last camera; the
+  meta line of a disabled layer now reads the catalog count. Contacts, Space
+  Missions and Clear selected data layers leave the panel as it is
+  (asturksever, #1723).

docs/CURRENT-STATE.md

@@ -1706,7 +1706,7 @@ Applications supply the existing floor/snap, geoid, picking, sprite, camera,
 trail, focus, readout, context, aircraft presentation and render services.
 The factory never constructs a second application registry. Configure a source
 before initialization; replacing it while initialized is rejected. Model loads
-use the supplied asset resolver, including the preload path. Enrichment receives
+use the supplied asset resolver, including the up-front fleet set load. Enrichment receives
 an abort signal and cannot update a later lifecycle after destruction. Existing
 camera, terrain floor, trail, selection and measured model-size policies remain.
 
@@ -2229,6 +2229,15 @@ shown without a fade once it is decoded (or after one second if its decode never
 settles), so a new camera's preview is blank only while its frame loads. Disposal
 releases listeners, subscriptions, image handlers, summary timers and chip-hide timers.
 
+The panel opens when a camera becomes active and collapses when the layer is
+switched off, from its own switch or anywhere else. The panel chrome applies
+the collapse, so a panel the desktop accordion only folded has its saved and
+shared state closed too. Clear selected data layers and Context isolation
+(Contacts, Space Missions) switch the layer off without the user asking: the
+panel and its share preference stay as they are, and the layer comes back to an
+open panel. A panel opened by hand while the layer is off stays open, and its
+meta line reads the catalog count, not the last active camera.
+
 ## UI disposal
 
 UI disposal releases the CCTV subscription, command-dock observer, legacy drag
@@ -2420,8 +2429,9 @@ is validated against Cesium 1.138.0 and must be revalidated on upgrades.
 
 `scripts/qa-anime-sky.mjs` checks asset readiness, visible Normal sky and
 Anime band coverage against a Vite dev server.
-`scripts/qa-sky-model-lighting.mjs` compares a lit `airplane.glb` against
-black and white environment maps in isolated scenes.
+`scripts/qa-sky-model-lighting.mjs` compares a lit fleet airliner
+(`public/models/fleet/aircraft/a320.glb`) against black and white environment
+maps in isolated scenes.
 
 ## Model atmosphere on Apple Metal
 
@@ -3606,20 +3616,22 @@ This is the current runtime/source-of-truth snapshot for the project.
 >   24.09 m aft (70 % of the model's rendered envelope, so inside it), 2.22 m
 >   below centre (6 %), and 2e-9 m off the centreline.
 > - **The tracked trail attaches to REAL HULL, aft and below (2026-08-23):**
->   `MODEL_TRAIL_ANCHOR_NATIVE` (`src/data/modelVisualAnchor.js`) holds, per GLB
->   and in RAW glTF coordinates (see the transform-chain entry below), the point
->   of the hull's CENTRELINE PROFILE (its y = 0 slice) closest to the aft-belly
->   AABB corner. It is NOT the corner: a bounding-box corner is empty
->   space, 4.80 m off the nearest triangle on `airplane.glb` and 6.14 m on
->   `jet.glb`, so the trail ended in mid air beside the aircraft. The head segment
+>   `FLEET_TRAIL_ANCHORS` (`src/data/fleetTrailAnchors.js`, generated by
+>   `scripts/measure-fleet-trail-anchors.mjs`) holds, per fleet aircraft and
+>   helicopter model and in RAW glTF coordinates (see the transform-chain entry
+>   below), the point of the hull's CENTRELINE PROFILE (its centreline slice)
+>   closest to the aft-belly AABB corner. It is NOT the corner: a bounding-box
+>   corner is empty space (4.80 m off the nearest triangle on the airliner
+>   asset this was first measured on, 6.14 m on the jet), so the trail ended in
+>   mid air beside the aircraft. The head segment
 >   is drawn from a point behind the aircraft to this anchor, so the anchor must
 >   stay aft (83–96 % of each aft extreme) or the segment enters at the tail and
->   stops inside the fuselage. `modelScale.test.mjs` reads the POSITION BUFFERS —
+>   stops inside the fuselage. `fleetModels.test.mjs` reads the POSITION BUFFERS —
 >   real vertices and triangles, because accessor min/max cannot tell a corner
 >   from a surface — and re-derives on-hull, aft, lowest-at-its-station,
 >   on-centreline, and the construction itself. Re-measure, never re-guess.
 > - **The trail anchor rides CESIUM'S transform chain, not a hand-rolled one
->   (2026-08-23 regression fix):** `MODEL_TRAIL_ANCHOR_NATIVE` stores RAW
+>   (2026-08-23 regression fix):** `FLEET_TRAIL_ANCHORS` stores RAW
 >   glTF coordinates and `modelAnchorWorld()` assembles
 >   `modelMatrix × components.transform × axisCorrection` — the same chain
 >   `ModelSceneGraph` renders with, built from Cesium's own exported
@@ -3654,7 +3666,7 @@ This is the current runtime/source-of-truth snapshot for the project.
 >   ENVELOPE, and between them the drawn start slides along the segment so the
 >   visible length grows CONTINUOUSLY from zero. Three earlier cuts are recorded
 >   because their shape matters: testing segment LENGTH against the radius HID
->   real trail (58 m aft of `airplane.glb`'s 34.41 m envelope gives a 33.98 m
+>   real trail (58 m aft of an airliner's 34.41 m envelope gives a 33.98 m
 >   segment, suppressed, though ~23.6 m of it is open air); CLIPPING at the
 >   envelope and keeping only what lay outside stopped a moving trail visibly
 >   SHORT of the aircraft, since a bounding sphere encloses a lot of empty space
@@ -4830,8 +4842,9 @@ activeCameraCardEnabled: true })` may publish it through the retained
 > - **Flights 3D/cockpit hardening:** the destination-direction cue is an
 >   inline SVG rather than a remotely loaded Material Icons ligature, so a
 >   blocked or late font can no longer expand the literal word `navigation`
->   across the cockpit. The grounded `airplane.glb` belly offset is calibrated
->   to the current asset's measured Y-up bounds (`0.063` native units).
+>   across the cockpit. A grounded aircraft stands its fleet model's scaled
+>   clearance (the catalog's `clearance`, measured below the model's origin)
+>   above the ground.
 >   Contact Previous/Next and Live Signals aircraft handoffs now
 >   re-seed the first-person camera anchor at the selected flight immediately;
 >   bounded feed-correction smoothing remains scoped to the same aircraft.
@@ -7290,8 +7303,9 @@ pins and share links already supply complete boxes.
   normal four-samples-per-250-ms budget. Retry timestamps more than the maximum
   30-second backoff ahead of the current clock are ignored. A smaller rollback
   can retain a bounded retry delay of up to 30 seconds.
-- Commercial and military aircraft use the same high-level FLEET model regime: 2D billboards when zoomed out, optional glTF models when closer, controlled by the DISPLAY rail `3D` toggle and `Proximity` / `All` modes. Since 2026-08-16 (Hangar fleet) models are PER-CLASS: real CC-BY GLBs for light/bizjet/turboprop/widebody/helicopter/uav (`CLASS_MODEL_REAL` in `src/data/aircraftClass.js` — meters-baked, scale 1, per-model belly/radius; provenance in `public/models/README.md`), the shared `airplane.glb` for the remaining civilian classes, and the military layer maps weight classes (real GLBs / 747 heavies / `jet.glb` fastjets, per-model heading offsets, flat amber or emergency red). Textured civilians carry a HEAVY tint, not a light one: `MODEL_COLOR_BLEND_AMOUNT` is `0.94` in BOTH layers under Cesium's `ColorBlendMode.MIX`, so the class colour supplies 94% of the surface and the asset's own texture ~6%. The visual direction is clean light silhouettes with only a weak diffuse contribution from the approved textures, so liveries deliberately do NOT read. IR boost raises the blend to a full `1.0`. Under NVG/FLIR (map preset or Cockpit vision) models render unlit flat-white at full alpha and scene fog is disabled (fog otherwise blacks out distant models with the globe hidden); state restores on exit.
-- **Aircraft models skip Cesium's dynamic environment map (2026-10-24).** Flights, Military Flights and Local ADS-B pass `environmentMapOptions: AIRCRAFT_ENVIRONMENT_MAP_OPTIONS` (`{ enabled: false }`, `src/data/aircraftModelLighting.js`) to every drawn model. Otherwise each `Model` renders the sky around it and reads it back from the GPU (`readPixels`) when it is first placed, and again whenever it moves more than 1 km, the scene's atmosphere settings change, or (under sunlight dynamic lighting) an hour of scene time passes (`DynamicEnvironmentMapManager`, Cesium 1.138). With the class colour supplying 94% of the surface, the models are lit from Cesium's default spherical harmonics instead, with no specular environment map, so the sky's model-lighting cube map no longer reaches aircraft. `src/data/aircraftModelLighting.test.mjs` pins the option at every drawn model call; the two preload calls only warm the glTF cache and are never drawn.
+- Commercial and military aircraft use the same high-level FLEET model regime: 2D billboards when zoomed out, optional glTF models when closer, controlled by the DISPLAY rail `3D` toggle and `Proximity` / `All` modes. Every model is one of the project's procedural fleet models (`public/models/fleet/`, MIT, 121 GLBs, about 2 MB in all; `public/models/README.md`), chosen per aircraft by `aircraftModelSpec` (`src/data/fleetModels.js`): its ICAO type's entry in `types.json`, else the model of its `classifyAircraft` class for a type the map lacks, else its ADS-B emitter category's, else the default airliner. It is drawn LIFE SIZE: the type's published length over the model's built length (`src/layers/flights/modelSpec.js`, shared by Flights, Military Flights and Local ADS-B), and a grounded aircraft stands the model's scaled clearance above the ground. `classifyAircraft` still picks the 2D icons. The whole set loads once, up front, when a layer that draws it starts (`loadFleetModelSet`, which logs `[Fleet] N/121 models (X MB) loaded in N ms`); models are built from those bytes, never fetched mid-session, and an aircraft stays its billboard until the set has loaded. Textured civilians carry a HEAVY tint, not a light one: `MODEL_COLOR_BLEND_AMOUNT` is `0.94` in BOTH layers under Cesium's `ColorBlendMode.MIX`, so the class colour supplies 94% of the surface and the model's own vertex colour ~6%; military models are flat amber, or emergency red. IR boost raises the blend to a full `1.0`. Under NVG/FLIR (map preset or Cockpit vision) models render unlit flat-white at full alpha and scene fog is disabled (fog otherwise blacks out distant models with the globe hidden); state restores on exit.
+- Vessels, Transit and Rail draw fleet models under the same DISPLAY rail `3D` toggle, at the same altitude ceiling, caps and add/keep radii as the aircraft (`FLEET_MODEL_POLICY`, `src/layers/flights/policy.js`; `createFleetModelLayer`, `src/data/fleetModelInstances.js`). A vessel's model follows its AIS ship type and is drawn at its reported length and beam (AIS static dimensions A+B and C+D, now carried on vessel rows as `length` and `beam`), standing at the sea surface, heading by true heading then course. A transit vehicle's model follows its layer mode (bus, tram, subway, rail or ferry; a vehicle of `unknown` mode keeps its icon), a train's its rail category and mode (rail, metro or tram). Neither the transit nor the rail sources carry a GTFS `route_type` or a finer mode (monorail, gondola, funicular, cable car), so the set's models for those and their `transit.elevation` lifts are not reached by any live source today. Both stand on the road or rail top they are drawn on, without the 1.5 m `GROUND_FLOOR_LIFT_M` their icons carry, and are painted in their mode or category colour where the model's `_TINT` attribute marks it. A vessel model is clipped at its waterline (one clipping plane per model, at the model origin's horizontal plane), so its hull below the water never shows through a plain globe, which Cesium does not depth-test models against. Under the NVG/FLIR styles (the Flights `irBoost` parameter) these models render unlit flat white, as aircraft models do. Each vehicle's icon stays the visual until its model is loaded, ready and placed; a model is picked as its icon is, and a vehicle drawn as its model keeps its selection card and its place in the detection overlay.
+- **Aircraft models skip Cesium's dynamic environment map (2026-10-24).** Flights, Military Flights and Local ADS-B pass `environmentMapOptions: AIRCRAFT_ENVIRONMENT_MAP_OPTIONS` (`{ enabled: false }`, `src/data/aircraftModelLighting.js`) to every drawn model. Otherwise each `Model` renders the sky around it and reads it back from the GPU (`readPixels`) when it is first placed, and again whenever it moves more than 1 km, the scene's atmosphere settings change, or (under sunlight dynamic lighting) an hour of scene time passes (`DynamicEnvironmentMapManager`, Cesium 1.138). With the class colour supplying 94% of the surface, the models are lit from Cesium's default spherical harmonics instead, with no specular environment map, so the sky's model-lighting cube map no longer reaches aircraft. `src/data/aircraftModelLighting.test.mjs` pins the option at every drawn model call; every model is built from the fleet set loaded up front, so there is no separate preload.
 - The DISPLAY-rail `3D` toggle is the user-facing activation path for both aircraft layers. Their small approved GLBs build their render resources without Cesium's frame-spread job queue, preventing continuous Photorealistic 3D Tiles streaming from starving model readiness; model caps, tracking, camera, and fallback billboards are unchanged.
 - **The `3D` toggle DEFAULTS ON in `proximity` on a first run.** Proximity is itself the budget — models appear only below `MODEL_ALT_CEIL_M` and only for the nearest `MODEL_MAX` in view — so the default costs nothing at globe scale, and `all` remains a deliberate opt-in. A fresh boot runs NO layer-state restoration (`LayerStateCoordinator.start()` returns early with neither a share payload nor stored state), so four independent initializers decide what a first-run operator sees and must agree: `booleanOption('models3d', 'e', true)` in `src/data/layerState.js`, `_models3dEnabled = true` in BOTH flight layers, `this._models3dEnabled = true` in `src/ui/aircraftDisplay.js`, and the `active` / `visible` classes on `#models3d-toggle` / `#models3d-mode-row` in `index.html`. All four are pinned together in `src/data/layerState.test.mjs`. Explicit state still wins: because the codec omits default-valued options, `models3d: false` is now what travels in a link (`lo=…f.e.0`) and restores OFF at both aircraft layers. **Consequence for returning users:** a stored `gev:layer-state:v2` blob is a FULL options snapshot, so a session that wrote one before this change carries `models3d:false` and keeps 3D off until the operator flips it (or clears the key) — the durable snapshot is treated as the recipient's own state, by design.
 - **Consequence of the flip on the recorded tracked/fleet inversion:** the 150–800 km band where surrounding contacts draw as models while the SELECTED one is still a glyph is now what an operator sees WITHOUT arming anything. The inversion itself is unchanged and still deliberate (see `src/data/trackedModelRegime.js`); only its reachability changed.

public/models/README.md

@@ -1,20 +1,33 @@
-# Bundled 3D Model Attribution
+# Bundled 3D Models
 
-The model files in this directory are third-party visual assets. They are not
-covered by the repository's MIT source-code license; each remains available
-under the license listed below.
+Every 3D model shipped in this directory is one of the project's procedural
+fleet models under [`fleet/`](fleet/): aircraft, helicopters, ships, buoys,
+transit and rail vehicles, and a few other airborne and ground objects. They
+are generated from code by the project maintainers, contain no third-party
+artwork, and are covered by the repository's [MIT license](../../LICENSE)
+like the source code.
 
-| File | Original work and creator | Source | License | Project modifications |
-|---|---|---|---|---|
-| `airplane.glb` | “boeing 747” by [zairiq-123](https://sketchfab.com/zairiq-123) | [Sketchfab model](https://sketchfab.com/3d-models/boeing-747-9b16672038ba48f98e6d80a159044ed9) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | Substantially modified and optimized for God's Eye View, including geometry/material simplification and coordinate/orientation preparation. The former 24× runtime calibration is baked into the mesh; location, rotation, and scale are applied; the bounding-box centre is at the origin; and the model uses glTF +Y-up with its nose toward local −X. Geometry remains uncompressed so the aircraft asset does not compete with photogrammetry for Draco worker capacity. |
-| `jet.glb` | “Private Jet” by [Nick the Name](https://sketchfab.com/Nick_The_Name) | [Sketchfab model](https://sketchfab.com/3d-models/private-jet-cbdd1de6ced9461e950eafaa302cc82b) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | Repackaged as a glTF binary for the project's military-flight visualization. Imported hierarchy transforms are baked into the meshes; location, rotation, and scale are applied; the bounding-box centre is at the origin; and the model uses meter scale, glTF +Y-up, and the shared nose −X convention. Existing materials are preserved. |
-| `bell206.glb` | “Bell 206 JetRanger” by [terran4627](https://sketchfab.com/terran4627) | [Sketchfab model](https://sketchfab.com/3d-models/bell-206-jetranger-d2f7ba1d671549d4b26aaf834139a1dd) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | Optimized for God's Eye View: geometry/material simplification, textures resized to 256 px WebP, orientation/scale vertex-baked to real-world meters (Y-up, nose −X), origin centered. |
-| `c172.glb` | “Cessna 172” by [e737](https://sketchfab.com/e0057537) | [Sketchfab model](https://sketchfab.com/3d-models/cessna-172-64cddaee5aff470682659a8c08525046) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | Optimized for God's Eye View: geometry/material simplification, textures resized to 256 px WebP, orientation/scale vertex-baked to real-world meters (Y-up, nose −X), origin centered. |
-| `citation2.glb` | “1990 Cessna Citation, Texture Detailed, Exterior” by [BlenderCommunityHead](https://sketchfab.com/aboodgoudagad) | [Sketchfab model](https://sketchfab.com/3d-models/1990-cessna-citation-texture-detailed-exterior-a78839624fe64900a8352cb23462350a) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | Optimized for God's Eye View: geometry/material simplification, textures resized to 256 px WebP, orientation/scale vertex-baked to real-world meters (Y-up, nose −X), origin centered. |
-| `mq9.glb` | “MQ-9” by [IProZenoN](https://sketchfab.com/IProZenoN) | [Sketchfab model](https://sketchfab.com/3d-models/mq-9-fabe963feb354c5584b51f9c470c3f7e) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | Optimized for God's Eye View: geometry/material simplification, textures resized to 256 px WebP, orientation/scale vertex-baked to real-world meters (Y-up, nose −X), origin centered. |
-| `b789.glb` | “Boeing 787-9” by [Nobilis 2](https://sketchfab.com/nobilishornet2) | [Sketchfab model](https://sketchfab.com/3d-models/boeing-787-9-b6711e2e698e4e469675c1154a50b7a3) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | Optimized for God's Eye View: geometry/material simplification, textures resized to 256 px WebP, orientation/scale vertex-baked to real-world meters (Y-up, nose −X), origin centered. |
-| `atr72.glb` | “ATR 72 - 600” by [Oyan3D](https://sketchfab.com/oyan3D) | [Sketchfab model](https://sketchfab.com/3d-models/atr-72-600-1e1a7186f7444d288675262fcee44744) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | Optimized for God's Eye View: geometry/material simplification, textures removed with dominant material colors baked into PBR factors (flat “abstracted” style), orientation/scale vertex-baked to real-world meters (Y-up, nose −X), origin centered. |
+| Path | What it holds |
+|---|---|
+| `fleet/catalog.json` | Every model by name: its file, category, built length, beam and bounds (metres, in Cesium's Z-up model frame: x along the length with the nose toward −X, y across the beam, z up), the clearance below its origin, and its 2D icon class. |
+| `fleet/types.json` | Which model draws which vehicle, and at what length: ICAO aircraft and helicopter type codes, ADS-B emitter categories, AIS ship-type and length ranges, GTFS route types, transit modes and rail categories, with the defaults. |
+| `fleet/aircraft/`, `fleet/helicopters/`, `fleet/ships/`, `fleet/buoys/`, `fleet/transit/`, `fleet/other/` | The models, one GLB each (EXT_meshopt_compression and KHR_mesh_quantization, vertex colours, no textures). |
 
-CC BY 4.0 permits sharing and adaptation, including commercial use, provided
-appropriate credit is retained, the license is linked, and modifications are
-identified. These credits do not imply endorsement by the original creators.
+How the layers use them:
+
+- Each layer draws a vehicle with the model its type selects, scaled to the
+  type's published length (a vessel to its reported AIS length and beam), so
+  every model is drawn life size. Ground objects, balloons and obstacles in
+  the `other` category are drawn at the size they are built.
+- An aircraft model's origin is its axis; it stands that model's scaled
+  clearance above the ground. A ship's origin is its waterline, and a transit
+  or rail vehicle's the road or rail top (a monorail or gondola is raised by
+  its `transit.elevation` entry, for a source that names those modes).
+- Transit and rail models carry a `_TINT` vertex attribute that marks where
+  the route or category colour is painted.
+- The whole set loads once, up front, when a layer that draws it starts; no
+  model is fetched while a session runs.
+
+`src/data/fleetModels.js` reads the set and chooses each vehicle's model;
+`src/data/fleetModels.test.mjs` checks that every model `types.json` names is
+in the catalog and on disk, and that no GLB exceeds 3 MB.