Cesium3DTilesTerrainData
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new Cesium.Cesium3DTilesTerrainData(options)
engine/Source/Core/Cesium3DTilesTerrainData.js 55

Terrain data for a single tile where the terrain data is represented as a glb (binary glTF).
参数名称 类型 描述信息
options object Object with the following properties:
参数名称 类型 默认值 描述信息
gltf Object.<string, *> The parsed glTF JSON.
minimumHeight number The minimum terrain height within the tile, in meters above the ellipsoid.
maximumHeight number The maximum terrain height within the tile, in meters above the ellipsoid.
boundingSphere BoundingSphere A sphere bounding all of the vertices in the mesh.
orientedBoundingBox OrientedBoundingBox An oriented bounding box containing all of the vertices in the mesh.
horizonOcclusionPoint Cartesian3 The horizon occlusion point of the mesh. If this point is below the horizon, the entire tile is assumed to be below the horizon as well. The point is expressed in ellipsoid-scaled coordinates.
skirtHeight number The height of the skirt to add on the edges of the tile.
requestVertexNormals boolean false 可选 Indicates whether normals should be loaded.
requestWaterMask boolean false 可选 Indicates whether water mask data should be loaded.
credits Array.<Credit> 可选 Array of credits for this tile.
childTileMask number 15 可选 A bit mask indicating which of this tile's four children exist. If a child's bit is set, geometry will be requested for that tile as well when it is needed. If the bit is cleared, the child tile is not requested and geometry is instead upsampled from the parent. The bit values are as follows:
Bit PositionBit ValueChild Tile
01Southwest
12Southeast
24Northwest
38Northeast
waterMask Uint8Array 可选 The buffer containing the water mask.
Experimental

This feature is not final and is subject to change without Cesium's standard deprecation policy.

参考:

成员(属性)

credits : Array.<Credit>|undefined
engine/Source/Core/Cesium3DTilesTerrainData.js 111

An array of credits for this tile.

waterMask : Uint8Array|HTMLImageElement|HTMLCanvasElement|ImageBitmap|undefined
engine/Source/Core/Cesium3DTilesTerrainData.js 123

The water mask included in this terrain data, if any. A water mask is a rectangular Uint8Array or image where a value of 255 indicates water and a value of 0 indicates land. Values in between 0 and 255 are allowed as well to smoothly blend between land and water.

方法

interpolateHeight(rectangle, longitude, latitude) → number|undefined
engine/Source/Core/Cesium3DTilesTerrainData.js 140

Returns the terrain height at a specified longitude and latitude, or undefined if the mesh is undefined.
参数名称 类型 描述信息
rectangle Rectangle The rectangle covered by this terrain data.
longitude number The longitude in radians.
latitude number The latitude in radians.
返回值:
The terrain height at the specified position, or undefined if the mesh is undefined. If the position is outside the rectangle, this method will extrapolate the height, which is likely to be wildly incorrect for positions far outside the rectangle.

isChildAvailable(thisX, thisY, childX, childY) → boolean
engine/Source/Core/Cesium3DTilesTerrainData.js 166

Determines if a given child tile is available, based on the TerrainData#childTileMask. The given child tile coordinates are assumed to be one of the four children of this tile. If non-child tile coordinates are given, the availability of the southeast child tile is returned.
参数名称 类型 描述信息
thisX number The tile X coordinate of this (the parent) tile.
thisY number The tile Y coordinate of this (the parent) tile.
childX number The tile X coordinate of the child tile to check for availability.
childY number The tile Y coordinate of the child tile to check for availability.
返回值:
True if the child tile is available; otherwise, false.

upsample(tilingScheme, thisX, thisY, thisLevel, descendantX, descendantY, descendantLevel) → Promise.<TerrainData>|undefined
engine/Source/Core/Cesium3DTilesTerrainData.js 396

Upsamples this terrain data for use by a descendant tile.
参数名称 类型 描述信息
tilingScheme TilingScheme The tiling scheme of this terrain data.
thisX number The X coordinate of this tile in the tiling scheme.
thisY number The Y coordinate of this tile in the tiling scheme.
thisLevel number The level of this tile in the tiling scheme.
descendantX number The X coordinate within the tiling scheme of the descendant tile for which we are upsampling.
descendantY number The Y coordinate within the tiling scheme of the descendant tile for which we are upsampling.
descendantLevel number The level within the tiling scheme of the descendant tile for which we are upsampling.
返回值:
A promise for upsampled terrain data for the descendant tile, or undefined if createMesh has not been called yet or too many asynchronous upsample operations are in progress and the request has been deferred.

wasCreatedByUpsampling() → boolean
engine/Source/Core/Cesium3DTilesTerrainData.js 482

Gets a value indicating whether or not this terrain data was created by upsampling lower resolution terrain data. If this value is false, the data was obtained from some other source, such as by downloading it from a remote server. This method should return true for instances returned from a call to Cesium3DTilesTerrainData#upsample.
返回值:
True if this instance was created by upsampling; otherwise, false.
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