CesiumIonPlugin

Overview

CesiumIonPlugin resolves a Cesium Ion asset endpoint at init() time and exposes addTerrain() to register the asset as a quantized-mesh terrain layer on the view.

The plugin handles the Cesium Ion authentication flow — fetching the asset endpoint URL and access token from https://api.cesium.com/v1/assets/<assetId>/endpoint — so your application only needs to supply the asset id and your Cesium Ion access token.

Usage

import ThreeView from "@navaramap/three";
import { DefaultPlugin } from "@navaramap/three_default_plugin";
import { CesiumIonPlugin } from "@navaramap/three_plugins";

const view = new ThreeView({ container, animation: true });
const cesiumIon = new CesiumIonPlugin({
  assetId: 12345, // Cesium ion asset id
  accessToken: "<your cesium ion token>",
});

view.addPlugin(new DefaultPlugin());
view.addPlugin(cesiumIon);
await view.init();

cesiumIon.addTerrain({
  maxZoom: 14,
  castShadow: true,
  receiveShadow: true,
  tms: true,
  geographic: true,
  requestVertexNormals: true,
  requestWaterMask: true,
});

Constructor

new CesiumIonPlugin(config: CesiumIonConfig)

CesiumIonConfig

Property	Type	Default	Description
assetId	number | string	—	Cesium Ion asset id.
accessToken	string	—	Cesium Ion access token used to resolve the asset endpoint.
endpoint	string	"https://api.cesium.com/v1/assets"	Override the Cesium Ion asset endpoint base URL (e.g. for proxies or self-hosted endpoints).

Methods

addTerrain(options)

addTerrain(options?: CesiumIonTerrainOptions): Layer

Registers the resolved Cesium Ion asset as a quantized-mesh terrain layer — internally it creates a quantized-mesh source (view.addSource(...)) and renders it with view.addLayer({ type: "terrain", source }). Must be called after view.init() has completed; otherwise the endpoint has not yet been resolved and the call throws.

Returns the Layer handle returned by view.addLayer().

Types

CesiumIonTerrainOptions

CesiumIonTerrainOptions is a flat object combining the quantized-mesh source’s fetch/decode options (with type, url, and token removed — the plugin supplies those from the resolved Cesium Ion endpoint) with the terrain layer’s mesh render options. The plugin routes each field to view.addSource() or view.addLayer() internally.

Commonly used options:

Property	Type	Description
maxZoom	number	Maximum zoom level fetched from the Cesium Ion endpoint.
minZoom	number	Minimum zoom level fetched from the Cesium Ion endpoint.
overscaledMaxZoom	number	The terrain is upsampled until it reaches this zoom level.
castShadow	boolean	Whether the terrain casts shadows.
receiveShadow	boolean	Whether the terrain receives shadows.
tms	boolean	Whether the source endpoint uses TMS tile coordinates. Cesium Ion quantized-mesh assets are TMS.
geographic	boolean	Whether the source endpoint uses a geographic (EPSG:4326) tiling scheme. Cesium Ion quantized-mesh is.
requestVertexNormals	boolean	Request per-vertex normals from the Cesium Ion endpoint. Required for lighting from quantized-mesh data.
requestWaterMask	boolean	Request the water mask from the Cesium Ion endpoint.
skirt	boolean	Whether to render terrain tile skirts.
skirtExaggeration	number	Multiplier applied to skirt height.
show	boolean	Whether the terrain is visible.
showBoundingBox	boolean	Render per-tile bounding boxes (debug).

See the quantized-mesh source and the terrain layer’s terrain render options for the complete list.

Related Resources

• About three_plugins — Package overview
• Terrain Layer — Terrain layer reference