cesiumjs-camera

ソース文書であり、このサイトへの操作指示ではありません。コマンド実行前に権限を確認してください。

import { Cartesian3, Math as CesiumMath } from "cesium";

// City overview: 3000 m altitude, angled view facing north
viewer.camera.setView({
  destination: Cartesian3.fromDegrees(-0.1276, 51.5074, 3000.0),
  orientation: {
    heading: CesiumMath.toRadians(0.0),   // north
    pitch: CesiumMath.toRadians(-50.0),    // angled down -- shows city layout clearly
    roll: 0.0,
  },
});

import { Cartesian3, Math as CesiumMath } from "cesium";

// Landmark standoff: camera placed south of Eiffel Tower, facing north
// Offset the destination AWAY from the landmark -- do NOT place directly above it
viewer.camera.setView({
  destination: Cartesian3.fromDegrees(2.2945, 48.847, 300.0), // ~1.2 km south
  orientation: {
    heading: CesiumMath.toRadians(0.0),    // facing north toward tower
    pitch: CesiumMath.toRadians(-20.0),    // slightly down -- tower visible above horizon
    roll: 0.0,
  },
});

import { Cartesian3, Math as CesiumMath } from "cesium";

// Canyon rim perspective: slightly above rim, looking down into the canyon
// Pitch of -20 reveals depth; near-horizontal (-5) would look flat across
viewer.camera.setView({
  destination: Cartesian3.fromDegrees(-112.14, 36.06, 2400.0),
  orientation: {
    heading: CesiumMath.toRadians(0.0),
    pitch: CesiumMath.toRadians(-20.0),    // steeper pitch to show canyon depth
    roll: 0.0,
  },
});

// Top-down geographic view -- use safe pitch to avoid gimbal lock
viewer.camera.setView({
  destination: Cesium.Cartesian3.fromDegrees(-112.14, 36.06, 50000.0),
  orientation: { heading: 0.0, pitch: -(Math.PI / 2 - 0.0001), roll: 0.0 },
});

// Rectangle form (top-down, orientation defaults to north/down)
viewer.camera.setView({
  destination: Cesium.Rectangle.fromDegrees(-77.0, 38.0, -72.0, 42.0),
});

import {
  BoundingSphere,
  Cartesian3,
  HeadingPitchRange,
  Math as CesiumMath,
} from "cesium";

// Keep the Eiffel Tower centered while approaching from 1500 m altitude
const target = Cartesian3.fromDegrees(2.2945, 48.8584);
const pitch = CesiumMath.toRadians(-35.0);
const desiredHeight = 1500.0;

// HeadingPitchRange.range is the slant distance to the target, not altitude.
const range = desiredHeight / Math.abs(Math.sin(pitch));

viewer.camera.flyToBoundingSphere(new BoundingSphere(target, 0.0), {
  offset: new HeadingPitchRange(0.0, pitch, range),
  duration: 3,
});

import { Cartesian3, Math as CesiumMath } from "cesium";

// Chain flights using the complete callback (flyTo does NOT return a Promise)
viewer.camera.flyTo({
  destination: Cartesian3.fromDegrees(-74.0445, 40.6892, 800.0),
  orientation: {
    heading: CesiumMath.toRadians(0.0),
    pitch: CesiumMath.toRadians(-35.0),
    roll: 0.0,
  },
  duration: 3,
  complete() {
    viewer.camera.flyTo({
      destination: Cartesian3.fromDegrees(-73.9857, 40.758, 600.0),
      orientation: {
        heading: CesiumMath.toRadians(0.0),
        pitch: CesiumMath.toRadians(-40.0),
        roll: 0.0,
      },
      duration: 2,
    });
  },
});

// Long-distance flight: LA to Tokyo via Europe
viewer.camera.flyTo({
  destination: Cesium.Cartesian3.fromDegrees(139.815, 35.714, 20000.0),
  duration: 20,
  flyOverLongitude: Cesium.Math.toRadians(60.0), // eastward via Europe
  pitchAdjustHeight: 1000, // look down at high altitude
});

import { Camera, Rectangle } from "cesium";

Camera.DEFAULT_VIEW_RECTANGLE = Rectangle.fromDegrees(-10.0, 35.0, 40.0, 60.0);
viewer.camera.flyHome(2.0); // duration in seconds; omit for auto

import { Cartesian3, Math as CesiumMath, HeadingPitchRange, Matrix4 } from "cesium";

// View from the south, looking north (heading 0 = facing north = camera is south)
const target = Cartesian3.fromDegrees(2.2945, 48.8584, 300.0);
viewer.camera.lookAt(
  target,
  new HeadingPitchRange(
    CesiumMath.toRadians(0.0),   // heading 0 = north-facing
    CesiumMath.toRadians(-20.0), // pitch -- 20 deg down (NOT -90; that would be overhead)
    1500.0,                      // range in meters
  ),
);
// ALWAYS release the lookAt lock to restore free navigation
viewer.camera.lookAtTransform(Matrix4.

name: cesiumjs-camera
description: "CesiumJS camera control - Camera, flyTo, lookAt, setView, ScreenSpaceCameraController, composable Controller camera controllers (1.144), CameraEventAggregator, flight animation. Use when positioning the camera, creating flyTo animations, constraining user navigation, adding custom or asset-inspection camera controllers, tracking entities, or converting between screen and world coordinates."

---
name: cesiumjs-camera
description: "CesiumJS camera control - Camera, flyTo, lookAt, setView, ScreenSpaceCameraController, composable Controller camera controllers (1.144), CameraEventAggregator, flight animation. Use when positioning the camera, creating flyTo animations, constraining user navigation, adding custom or asset-inspection camera controllers, tracking entities, or converting between screen and world coordinates."
---
# CesiumJS Camera & Navigation

> **Baseline:** CesiumJS v1.144 -- ES module imports (`import { ... } from "cesium";`)

## Camera Fundamentals

Access via `viewer.camera`. The camera has a `position` (Cartesian3 in world
coords), orientation vectors (`direction`, `up`, `right`), and a frustum.
All angles are **radians**.

Read-only computed properties: `positionWC`, `positionCartographic`,
`directionWC`, `upWC`, `rightWC`, `heading` (0 = north, clockwise), `pitch`
(negative = down), `roll`, `transform`, `viewMatrix`, `inverseViewMatrix`.

Events: `moveStart` / `moveEnd` fire when movement begins/ends. `changed`
fires when the camera moves by more than `percentageChanged` (default 0.5).

> **City views are more realistic with 3D buildings.** For production skyline,
> street-level, or urban panorama views, use a tileset that is actually available
> in the target environment. `Cesium.createOsmBuildingsAsync()` and Google
> Photorealistic 3D Tiles are ion-entitlement-backed; avoid them in public or
> no-token examples unless the caller explicitly asks for those services. For
> portable examples, use an OpenStreetMap/ArcGIS basemap, visible markers, public
> URL-backed 3D Tiles, or a higher-altitude city overview.

### Altitude & Orientation Guidelines

Choose altitude and pitch to match the **scale of the feature** you want to show:

| View type | Altitude (m) | Pitch (deg) | Notes |
|---|---|---|---|
| **Tourist / monument standoff** | 50 -- 500 | -5 to -20 | Camera at near-ground level, offset laterally from the landmark. Subject fills the frame with sky visible above. Use `lookAt` with HeadingPitchRange pitch near -10°. **Never place the camera directly overhead at this range.** |
| **Landmark close-up** | 500 -- 1,500 | -25 to -35 | Individual buildings/structures fill the frame. Use `lookAt` with appropriate range. |
| **City panoramic / skyline** | 800 -- 1,500 | -10 to -20 | For viewing a skyline from across a river or bay. Position camera to the side, face the city. Use an available 3D Tiles source only when the environment provides one. |
| **City overview** | 2,000 -- 5,000 | -35 to -50 | Urban grid, rivers, and parks clearly visible |
| **Metro / regional** | 8,000 -- 20,000 | -60 to -90 | Entire metro area or geographic feature |
| **Canyon / cliff rim** | 50 -- 300 above rim | -15 to -25 | Use steeper pitch to reveal depth below. Near-horizontal (-5) looks flat across terrain. Add wall/rim entity overlays and a river polyline to make canyon structure visible. |
| **Country / continent** | 500,000 -- 5,000,000 | -90 | Political boundaries, coastlines |

**When the prompt says "looking at [city]" or "start at [city]"**, default to **city overview** range (2,000-5,000 m) with pitch around **-45** to **-60** degrees and heading **0** (north). This produces a clear, recognizable view where the urban layout, rivers, and landmarks are identifiable.

> **Target intent vs. camera position:** In `setView` and `flyTo`, a Cartesian
> `destination` is the camera's final position, not the point it should look at.
> For requests such as "fly to Los Angeles" or "show the Eiffel Tower", treat
> the named coordinates as a target to frame. Prefer `viewBoundingSphere` for
> an instant view or `flyToBoundingSphere` for an animated flight.

**Top-down views** (`pitch: -90`) are best for geographic features (canyons, coastlines, rivers) where overhead perspective reveals the distinctive shape. For cities, prefer an angled view that shows the 3D skyline.

> **Gimbal lock:** Never use `pitch: -Math.PI/2` exactly. Use
> `-(Math.PI / 2 - 0.0001)` for straight-down views to avoid singularity.

> **Ground-level views (altitude < 200 m)** require 3D Tiles. Without them,
> CesiumJS shows only sky and flat ground. Suggest a higher-altitude fallback.

> **Skyline panoramics** (across a river/bay): 800-1,500 m, pitch -10 to -20.
> Add an available 3D Tiles source for a true 3D silhouette; otherwise make the
> screenshot goal honest by using a higher-altitude map/marker view. Pitch too
> horizontal (-5) at moderate altitude shows a flat grid, not a skyline.

> **Public visual eval rule for landmarks:** OpenStreetMap imagery alone does
> not render the Eiffel Tower, Empire State Building, Statue of Liberty, or a
> skyline as recognizable 3D subjects. When a public/no-token scenario asks for
> an identifiable landmark or skyline, add an explicit visual surrogate at the
> target: a tall cylinder/box/polyline tower, colored mast, skyline bar cluster,
> or large labeled marker. Frame that surrogate so it is inspectable, roughly
> one-third to two-thirds of the frame height for landmark views. Do not rely on
> a map label or 10 px point as the subject.

> **Canyon / cliff rim views**: pitch -15 to -25. Near-horizontal pitch (-5 to
> -8) looks flat across terrain and misses the vertical drop. Always add entity
> overlays (rim wall polygons, river polyline) so the canyon structure is
> visible -- without entities the scene shows only a flat basemap regardless
> of camera angle.

> **CRITICAL -- Never place the camera directly above a landmark** when a
> standoff / perspective view is intended. Positioning the camera at
> `Cartesian3.fromDegrees(lon, lat, 1000)` pointing straight down
> (`pitch: -Math.PI/2`) puts the camera overhead the subject (`up_alignment=1`)
> and fails landmark-view checks. Always offset the camera laterally:
> use `lookAt` with a HeadingPitchRange pitch of -10° to -45°, or place the
> `destination` 500--2,000 m to the side of the landmark and aim the heading
> toward it.

---

## setView -- Instant Placement

Teleports the camera in a single frame -- no animation. Use for initial view,
mode resets, constraint setup. `destination`: `Cartesian3` or `Rectangle`.
`orientation`: `{ heading, pitch, roll }` or `{ direction, up }`.

```js
import { Cartesian3, Math as CesiumMath } from "cesium";

// City overview: 3000 m altitude, angled view facing north
viewer.camera.setView({
  destination: Cartesian3.fromDegrees(-0.1276, 51.5074, 3000.0),
  orientation: {
    heading: CesiumMath.toRadians(0.0),   // north
    pitch: CesiumMath.toRadians(-50.0),    // angled down -- shows city layout clearly
    roll: 0.0,
  },
});
```

```js
import { Cartesian3, Math as CesiumMath } from "cesium";

// Landmark standoff: camera placed south of Eiffel Tower, facing north
// Offset the destination AWAY from the landmark -- do NOT place directly above it
viewer.camera.setView({
  destination: Cartesian3.fromDegrees(2.2945, 48.847, 300.0), // ~1.2 km south
  orientation: {
    heading: CesiumMath.toRadians(0.0),    // facing north toward tower
    pitch: CesiumMath.toRadians(-20.0),    // slightly down -- tower visible above horizon
    roll: 0.0,
  },
});
```

```js
import { Cartesian3, Math as CesiumMath } from "cesium";

// Canyon rim perspective: slightly above rim, looking down into the canyon
// Pitch of -20 reveals depth; near-horizontal (-5) would look flat across
viewer.camera.setView({
  destination: Cartesian3.fromDegrees(-112.14, 36.06, 2400.0),
  orientation: {
    heading: CesiumMath.toRadians(0.0),
    pitch: CesiumMath.toRadians(-20.0),    // steeper pitch to show canyon depth
    roll: 0.0,
  },
});
```

```js
// Top-down geographic view -- use safe pitch to avoid gimbal lock
viewer.camera.setView({
  destination: Cesium.Cartesian3.fromDegrees(-112.14, 36.06, 50000.0),
  orientation: { heading: 0.0, pitch: -(Math.PI / 2 - 0.0001), roll: 0.0 },
});

// Rectangle form (top-down, orientation defaults to north/down)
viewer.camera.setView({
  destination: Cesium.Rectangle.fromDegrees(-77.0, 38.0, -72.0, 42.0),
});
```

---

## flyTo -- Animated Flight

Smoothly animates the camera. Returns nothing (not a Promise); use `complete`
callback. Options: `destination`, `orientation`, `duration` (seconds),
`complete`/`cancel`, `maximumHeight`, `pitchAdjustHeight`, `flyOverLongitude`.

Use `flyTo` when `destination` intentionally describes the camera's final
position. For a named city, landmark, entity, or coordinate that must remain
centered, use `flyToBoundingSphere`.

```js
import {
  BoundingSphere,
  Cartesian3,
  HeadingPitchRange,
  Math as CesiumMath,
} from "cesium";

// Keep the Eiffel Tower centered while approaching from 1500 m altitude
const target = Cartesian3.fromDegrees(2.2945, 48.8584);
const pitch = CesiumMath.toRadians(-35.0);
const desiredHeight = 1500.0;

// HeadingPitchRange.range is the slant distance to the target, not altitude.
const range = desiredHeight / Math.abs(Math.sin(pitch));

viewer.camera.flyToBoundingSphere(new BoundingSphere(target, 0.0), {
  offset: new HeadingPitchRange(0.0, pitch, range),
  duration: 3,
});
```

```js
import { Cartesian3, Math as CesiumMath } from "cesium";

// Chain flights using the complete callback (flyTo does NOT return a Promise)
viewer.camera.flyTo({
  destination: Cartesian3.fromDegrees(-74.0445, 40.6892, 800.0),
  orientation: {
    heading: CesiumMath.toRadians(0.0),
    pitch: CesiumMath.toRadians(-35.0),
    roll: 0.0,
  },
  duration: 3,
  complete() {
    viewer.camera.flyTo({
      destination: Cartesian3.fromDegrees(-73.9857, 40.758, 600.0),
      orientation: {
        heading: CesiumMath.toRadians(0.0),
        pitch: CesiumMath.toRadians(-40.0),
        roll: 0.0,
      },
      duration: 2,
    });
  },
});
```

> **Altitude tip for tours**: keep each stop at **600 m+** so tiles and imagery
> load. Below 400 m, expect blurry tiles on fast successive flights.

```js
// Long-distance flight: LA to Tokyo via Europe
viewer.camera.flyTo({
  destination: Cesium.Cartesian3.fromDegrees(139.815, 35.714, 20000.0),
  duration: 20,
  flyOverLongitude: Cesium.Math.toRadians(60.0), // eastward via Europe
  pitchAdjustHeight: 1000, // look down at high altitude
});
```

Control in-progress flights with `completeFlight()` (jumps to end state) and
`cancelFlight()` (stays at current position).

---

## flyHome

Fly to the default view. Override with `Camera.DEFAULT_VIEW_RECTANGLE`.

```js
import { Camera, Rectangle } from "cesium";

Camera.DEFAULT_VIEW_RECTANGLE = Rectangle.fromDegrees(-10.0, 35.0, 40.0, 60.0);
viewer.camera.flyHome(2.0); // duration in seconds; omit for auto
```

> **Limitation:** `flyHome()` always produces a top-down, north-up view --
> no orientation control. Workaround: intercept `viewer.homeButton.viewModel
> .command.beforeExecute`, cancel it, and call `flyTo` with custom orientation.

---

## lookAt -- Lock Camera to Target

Positions camera to look at a target from an offset (`HeadingPitchRange` or
`Cartesian3`). **Locks the camera until `lookAtTransform(Matrix4.IDENTITY)`.**

> **Overhead trap with `lookAt`:** A `HeadingPitchRange` pitch of `-Math.PI/2`
> positions the camera directly above the target (`up_alignment ≈ 1`), which
> fails landmark-view checks. For any perspective or tourist view, use pitch
> between **-10° and -45°**. Only use pitch near -90° for intentional top-down
> map views.

```js
import { Cartesian3, Math as CesiumMath, HeadingPitchRange, Matrix4 } from "cesium";

// View from the south, looking north (heading 0 = facing north = camera is south)
const target = Cartesian3.fromDegrees(2.2945, 48.8584, 300.0);
viewer.camera.lookAt(
  target,
  new HeadingPitchRange(
    CesiumMath.toRadians(0.0),   // heading 0 = north-facing
    CesiumMath.toRadians(-20.0), // pitch -- 20 deg down (NOT -90; that would be overhead)
    1500.0,                      // range in meters
  ),
);
// ALWAYS release the lookAt lock to restore free navigation
viewer.camera.lookAtTransform(Matrix4.