reszta poprawek

2026-08-09 09:47:34 +02:00
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+# CesiumJS — 3D flyovers in Remotion
+
+Instructions for achieving map animations with "flight-simulator" perspective in Remotion.
+
+## Modes
+
+| Mode        | Data                                                  | Use for                                                |
+| ----------- | ----------------------------------------------------- | ------------------------------------------------------ |
+| `landscape` | MapTiler `terrain-quantized-mesh-v2` + `satellite-v2` | Mountains, gorges, rivers, coastlines and rural routes |
+| `city`      | Google Photorealistic 3D Tiles                        | Cities, architecture and recognizable landmarks        |
+
+Do not use footprint extrusions for city flyovers. They produce crude building blocks rather than
+textured architecture.
+
+## Credentials
+
+For `landscape`, set:
+
+```text
+REMOTION_MAPTILER_KEY=...
+```
+
+Create a MapTiler key at https://cloud.maptiler.com/account/keys/.
+
+For `city`, set:
+
+```text
+REMOTION_GOOGLE_MAPS_API_KEY=...
+```
+
+Create a billing-enabled Google Map Tiles API key by following
+https://developers.google.com/maps/documentation/tile/get-api-key. Enable the **Map Tiles API** and
+restrict the key to that API. Ensure its application restriction permits local headless Remotion
+requests.
+
+## Build the flight
+
+1. Copy `assets/CesiumFlythrough.tsx`, a path JSON and `assets/example-Root.tsx` into the Remotion
+   project, or import the component directly.
+2. Supply the camera route as `[longitude, latitude][]`. Use only meaningful control points; do not hand-author dozens of tiny corrections.
+3. Leave `pathSmoothingPasses={3}` initially. The component applies repeated Chaikin corner cutting, turning straight-then-corner input into a continuous swerve. Increase to `4` for a softer route or reduce to `2` when the camera must follow a tight corridor.
+4. Set absolute camera altitudes for the location. City cameras normally fly lower than landscape
+   cameras.
+5. Render a middle-frame still before rendering the full video.
+
+```tsx
+<CesiumFlythrough
+  mode="city"
+  path={cameraPath}
+  pathSmoothingPasses={3}
+  altitudeStart={700}
+  altitudeEnd={500}
+  lookAheadKm={0.7}
+  travelKm={4.5}
+/>
+```
+
+## Camera behavior
+
+Walk the smoothed curve by arc length for constant ground speed. Aim at a real point farther along
+the curve rather than its next vertex. Derive roll from the change in look-ahead bearing so the
+camera banks into a turn instead of twitching left and right.
+
+For landscape routes, `scripts/prep-cesium-path.mjs` also clips, resamples, smooths and dampens a
+GeoJSON centerline before the component applies its final curve smoothing.
+
+
+## Mechanics
+
+- Set `viewer.useDefaultRenderLoop = false`.
+- Call `viewer.render()`, never `scene.render()`, while settling.
+- Use `preserveDrawingBuffer: true`.
+- Gate initialization and every frame with `delayRender`.
+- Drive camera animation from `useCurrentFrame()`; do not use CSS transitions or browser-timed animation.
+- Settle landscapes on `globe.tilesLoaded` and cities on `tileset.tilesLoaded`.
+- Keep all provider attribution visible.
+- Record the source and effective date of custom or disputed geography.
+- Inspect rendered pixels, not only Studio playback, at every required aspect ratio.
+- Read `references/3d-flyover-architecture.md` for camera math, `references/3d-data-sources.md` for provider details, and `references/3d-troubleshooting.md` for blank, coarse, unauthorized or timed-out renders.
+
+## Files
+
+- `assets/CesiumFlythrough.tsx` — reusable two-mode component.
+- `assets/flight-path.ts` — dependency-free Chaikin route smoothing.
+- `assets/example-Root.tsx` — landscape and city compositions.
+- `assets/cesium-path.json` — sample landscape route.
+- `assets/city-path.json` — sample city route.
+- `assets/sample-river.geojson` — sample path-preparation input.
+- `scripts/prep-cesium-path.mjs` — dependency-free landscape route preparation.