Cesiumjs Viewer Setup

import { Viewer, ImageryLayer, OpenStreetMapImageryProvider } from "cesium";
import "cesium/Build/Cesium/Widgets/widgets.css";

const viewer = new Viewer("cesiumContainer", {
  baseLayer: new ImageryLayer(new OpenStreetMapImageryProvider({
    url: "https://tile.openstreetmap.org/",
    maximumLevel: 18,
  })),
  baseLayerPicker: false,
});

const tileset = await Cesium3DTileset.fromUrl(url);
viewer.scene.primitives.add(tileset);

// Pick ONE of:
await viewer.zoomTo(tileset);                 // instant fit to bounding sphere
await viewer.flyTo(tileset, { duration: 0 }); // animated; duration 0 = instant

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

await viewer.zoomTo(tileset, new HeadingPitchRange(
  CesiumMath.toRadians(45),   // heading
  CesiumMath.toRadians(-30),  // pitch
  /* range omitted -> auto-fit */
));

import { Ion } from "cesium";

Ion.defaultAccessToken = "YOUR_TOKEN";  // required for ion assets
Ion.defaultServer = "https://your-ion-server.example.com/"; // optional: self-hosted

import { IonResource, Cesium3DTileset } from "cesium";

const resource = await IonResource.fromAssetId(96188);
const tileset = await Cesium3DTileset.fromUrl(resource);
viewer.scene.primitives.add(tileset);
await viewer.zoomTo(tileset);

import { GoogleMaps, createGooglePhotorealistic3DTileset, Viewer, IonGeocodeProviderType } from "cesium";

GoogleMaps.defaultApiKey = "YOUR_GOOGLE_MAPS_API_KEY"; // optional: without key, served via ion

const viewer = new Viewer("cesiumContainer", {
  geocoder: IonGeocodeProviderType.GOOGLE, // required with Google 3D Tiles
});

const tileset = await createGooglePhotorealistic3DTileset({
  onlyUsingWithGoogleGeocoder: true,
});
viewer.scene.primitives.add(tileset);

import { ITwinPlatform, ITwinData } from "cesium";

ITwinPlatform.defaultAccessToken = "YOUR_ITWIN_TOKEN";
const tileset = await ITwinData.createTilesetForIModel(viewer, "imodel-id");

// 1.140+ (#13208): Reality Data of type GaussianSplat3DTiles is now supported
const splats = await ITwinData.createTilesetForRealityDataId(
  iTwinId,
  realityDataId,
  ITwinPlatform.RealityDataType.GaussianSplat3DTiles,
);
viewer.scene.primitives.add(splats);

import { Viewer, ImageryLayer, OpenStreetMapImageryProvider } from "cesium";

const viewer = new Viewer("cesiumContainer", {
  baseLayer: new ImageryLayer(new OpenStreetMapImageryProvider({
    url: "https://tile.openstreetmap.org/",
    maximumLevel: 18,
  })),
  animation: false, baseLayerPicker: false, fullscreenButton: false,
  geocoder: false, homeButton: false, infoBox: false,
  sceneModePicker: false, selectionIndicator: false,
  timeline: false, navigationHelpButton: false,
});

import { CesiumWidget, Ion } from "cesium";
Ion.defaultAccessToken = "YOUR_TOKEN";

const widget = new CesiumWidget("cesiumContainer", { shouldAnimate: true });
// Exposes: widget.scene, widget.camera, widget.entities

import { Viewer, SceneMode } from "cesium";

const viewer = new Viewer("cesiumContainer", { sceneMode: SceneMode.SCENE2D });
viewer.scene.morphTo3D(2.0);          // animated transition
viewer.scene.morphToColumbusView(2.0);

const scene = viewer.scene;
scene.globe.depthTestAgainstTerrain = true; // entities interact with terrain
scene.globe.enableLighting = true;          // sun-based lighting

// Key sub-objects
scene.camera;           // Camera
scene.primitives;       // PrimitiveCollection
scene.groundPrimitives; // PrimitiveCollection (ground-clamped)
scene.imageryLayers;    // ImageryLayerCollection
scene.postProcessStages;

scene.requestRender();  // trigger frame in requestRenderMode

import { createOsmBuildingsAsync, Cesium3DTileStyle } from "cesium";

// Default styling (colors from OSM tags)
const tileset = await createOsmBuildingsAsync();
viewer.scene.primitives.add(tileset);

// Custom style
const styled = await createOsmBuildingsAsync({
  style: new Cesium3DTileStyle({
    color: { conditions: [
      ["${feature['building']} === 'hospital'", "color('#0000FF')"],
      [true, "color('#ffffff')"],
    ]},
  }),
});

import { createGooglePhotorealistic3DTileset, IonGeocodeProviderType } from "cesium";

// Must use Google geocoder
const viewer = new Viewer("cesiumContainer", { geocoder: IonGeocodeProviderType.GOOGLE });
const tileset = await createGooglePhotorealistic3DTileset({ onlyUsingWithGoogleGeocoder: true });
viewer.scene.primitives.add(tileset);

import { Viewer, Terrain } from "cesium";

// World terrain with normals and water
const viewer = new Viewer("cesiumContainer", {
  terrain: Terrain.fromWorldTerrain({ requestVertexNormals: true, requestWaterMask: true }),
});

// Bathymetry (ocean floor)
const viewer2 = new Viewer("cesiumContainer", {
  terrain: Terrain.fromWorldBathymetry({ requestVertexNormals: true }),
});

import { Terrain, CesiumTerrainProvider } from "cesium";

const terrain = new Terrain(CesiumTerrainProvider.fromUrl("https://my-terrain.example.com"));
viewer.scene.setTerrain(terrain);

terrain.readyEvent.addEventListener((provider) => {
  viewer.scene.globe.enableLighting = true;
});
terrain.errorEvent.addEventListener((error) => console.error("Terrain failed:", error));

import { createWorldTerrainAsync, createWorldImageryAsync, IonWorldImageryStyle } from "cesium";

const terrainProvider = await createWorldTerrainAsync({ requestVertexNormals: true });
viewer.terrainProvider = terrainProvider;

const imageryProvider = await createWorldImageryAsync({ style: IonWorldImageryStyle.AERIAL_WITH_LABELS });

import { Viewer, CartographicGeocoderService, IonGeocoderService, OpenCageGeocoderService } from "cesium";

// Multiple services (searched in order)
const viewer = new Viewer("cesiumContainer", {
  geocoder: [
    new CartographicGeocoderService(), // accepts "lat, lon" input
    new IonGeocoderService({ scene: viewer.scene }),
  ],
});

const myGeocoder = {
  async geocode(input, type) {
    // type: GeocodeType.SEARCH or GeocodeType.AUTOCOMPLETE
    const resp = await fetch(`https://api.example.com/search?q=${input}`);
    const data = await resp.json();
    return data.map((item) => ({
      displayName: item.name,
      destination: Cartesian3.fromDegrees(item.lon, item.lat),
    }));
  },
};
const viewer = new Viewer("cesiumContainer", { geocoder: [myGeocoder] });

import { Viewer, viewerDragDropMixin, viewerCesium3DTilesInspectorMixin,
  viewerCesiumInspectorMixin, viewerPerformanceWatchdogMixin, viewerVoxelInspectorMixin } from "cesium";

const viewer = new Viewer("cesiumContainer");

// Drag-and-drop CZML/GeoJSON/KML loading
viewer.extend(viewerDragDropMixin, { dropTarget: "cesiumContainer", clearOnDrop: true });
viewer.dropError.addEventListener((handler, name, error) => console.error(error));

viewer.extend(viewerCesium3DTilesInspectorMixin);    // 3D Tiles debug panel
viewer.extend(viewerCesiumInspectorMixin);            // general scene inspector
viewer.extend(viewerPerformanceWatchdogMixin);        // low-FPS warning
viewer.extend(viewerVoxelInspectorMixin);             // voxel debug panel

await viewer.flyTo(entity, { duration: 3.0, offset: headingPitchRange }); // animated
await viewer.zoomTo(tileset);   // instant; uses bounding sphere
viewer.destroy();               // free all resources

import { Credit, FrameRateMonitor } from "cesium";

// Custom credit (showOnScreen = true)
viewer.creditDisplay.addStaticCredit(new Credit("Data by Example Corp", true));

// Monitor frame rate
const monitor = FrameRateMonitor.fromScene(viewer.scene);
monitor.lowFrameRate.addEventListener(() => console.warn("Low FPS"));
monitor.nominalFrameRate.addEventListener(() => console.log("FPS recovered"));