EllipsoidTerrainProvider
查阅Mars3D API

new Cesium.EllipsoidTerrainProvider(options)
engine/Source/Core/EllipsoidTerrainProvider.js 26

A very simple TerrainProvider that produces geometry by tessellating an ellipsoidal surface.
参数名称 类型 描述信息
options object 可选 Object with the following properties:
参数名称 类型 描述信息
tilingScheme TilingScheme 可选 The tiling scheme specifying how the ellipsoidal surface is broken into tiles. If this parameter is not provided, a GeographicTilingScheme is used.
ellipsoid Ellipsoid 可选 The ellipsoid. If the tilingScheme is specified, this parameter is ignored and the tiling scheme's ellipsoid is used instead. If neither parameter is specified, the WGS84 ellipsoid is used.
参考:

成员(属性)

readonly availability : TileAvailability
engine/Source/Core/EllipsoidTerrainProvider.js 120

Gets an object that can be used to determine availability of terrain from this provider, such as at points and in rectangles. This property may be undefined if availability information is not available.

readonly credit : Credit
engine/Source/Core/EllipsoidTerrainProvider.js 69

Gets the credit to display when this terrain provider is active. Typically this is used to credit the source of the terrain.

readonly errorEvent : Event
engine/Source/Core/EllipsoidTerrainProvider.js 56

Gets an event that is raised when the terrain provider encounters an asynchronous error. By subscribing to the event, you will be notified of the error and can potentially recover from it. Event listeners are passed an instance of TileProviderError.

readonly hasVertexNormals : boolean
engine/Source/Core/EllipsoidTerrainProvider.js 107

Gets a value indicating whether or not the requested tiles include vertex normals.

readonly hasWaterMask : boolean
engine/Source/Core/EllipsoidTerrainProvider.js 95

Gets a value indicating whether or not the provider includes a water mask. The water mask indicates which areas of the globe are water rather than land, so they can be rendered as a reflective surface with animated waves.

readonly tilingScheme : GeographicTilingScheme
engine/Source/Core/EllipsoidTerrainProvider.js 81

Gets the tiling scheme used by this provider.

方法

getLevelMaximumGeometricError(level) → number
engine/Source/Core/EllipsoidTerrainProvider.js 163

Gets the maximum geometric error allowed in a tile at a given level.
参数名称 类型 描述信息
level number The tile level for which to get the maximum geometric error.
返回值:
The maximum geometric error.

getTileDataAvailable(x, y, level) → boolean|undefined
engine/Source/Core/EllipsoidTerrainProvider.js 177

Determines whether data for a tile is available to be loaded.
参数名称 类型 描述信息
x number The X coordinate of the tile for which to request geometry.
y number The Y coordinate of the tile for which to request geometry.
level number The level of the tile for which to request geometry.
返回值:
Undefined if not supported, otherwise true or false.

loadTileDataAvailability(x, y, level) → undefined
engine/Source/Core/EllipsoidTerrainProvider.js 193

Makes sure we load availability data for a tile
参数名称 类型 描述信息
x number The X coordinate of the tile for which to request geometry.
y number The Y coordinate of the tile for which to request geometry.
level number The level of the tile for which to request geometry.
返回值:
This provider does not support loading availability.

requestTileGeometry(x, y, level, request) → Promise.<TerrainData>|undefined
engine/Source/Core/EllipsoidTerrainProvider.js 140

Requests the geometry for a given tile. The result includes terrain data and indicates that all child tiles are available.
参数名称 类型 描述信息
x number The X coordinate of the tile for which to request geometry.
y number The Y coordinate of the tile for which to request geometry.
level number The level of the tile for which to request geometry.
request Request 可选 The request object. Intended for internal use only.
返回值:
A promise for the requested geometry. If this method returns undefined instead of a promise, it is an indication that too many requests are already pending and the request will be retried later.
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