GeometryInstance
查阅Mars3D API

new Cesium.GeometryInstance(options)
engine/Source/Core/GeometryInstance.js 51

Geometry instancing allows one Geometry object to be positions in several different locations and colored uniquely. For example, one BoxGeometry can be instanced several times, each with a different modelMatrix to change its position, rotation, and scale.
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
geometry Geometry | GeometryFactory The geometry to instance.
modelMatrix Matrix4 Matrix4.IDENTITY 可选 The model matrix that transforms to transform the geometry from model to world coordinates.
id object 可选 A user-defined object to return when the instance is picked with Scene#pick or get/set per-instance attributes with Primitive#getGeometryInstanceAttributes.
attributes object 可选 Per-instance attributes like a show or color attribute shown in the example below.
使用示例:
// Create geometry for a box, and two instances that refer to it.
// One instance positions the box on the bottom and colored aqua.
// The other instance positions the box on the top and color white.
const geometry = Cesium.BoxGeometry.fromDimensions({
  vertexFormat : Cesium.VertexFormat.POSITION_AND_NORMAL,
  dimensions : new Cesium.Cartesian3(1000000.0, 1000000.0, 500000.0)
});
const instanceBottom = new Cesium.GeometryInstance({
  geometry : geometry,
  modelMatrix : Cesium.Matrix4.multiplyByTranslation(Cesium.Transforms.eastNorthUpToFixedFrame(
    Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883)), new Cesium.Cartesian3(0.0, 0.0, 1000000.0), new Cesium.Matrix4()),
  attributes : {
    color : Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.AQUA)
  },
  id : 'bottom'
});
const instanceTop = new Cesium.GeometryInstance({
  geometry : geometry,
  modelMatrix : Cesium.Matrix4.multiplyByTranslation(Cesium.Transforms.eastNorthUpToFixedFrame(
    Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883)), new Cesium.Cartesian3(0.0, 0.0, 3000000.0), new Cesium.Matrix4()),
  attributes : {
    color : Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.AQUA)
  },
  id : 'top'
});
参考:

成员(属性)

attributes : object
engine/Source/Core/GeometryInstance.js 110

Per-instance attributes like ColorGeometryInstanceAttribute or ShowGeometryInstanceAttribute. Geometry attributes varying per vertex; these attributes are constant for the entire instance.
默认值: undefined

geometry : Geometry
engine/Source/Core/GeometryInstance.js 67

The geometry being instanced.
默认值: undefined

id : object
engine/Source/Core/GeometryInstance.js 93

User-defined object returned when the instance is picked or used to get/set per-instance attributes.
默认值: undefined
参考:

modelMatrix : Matrix4
engine/Source/Core/GeometryInstance.js 79

The 4x4 transformation matrix that transforms the geometry from model to world coordinates. When this is the identity matrix, the geometry is drawn in world coordinates, i.e., Earth's WGS84 coordinates. Local reference frames can be used by providing a different transformation matrix, like that returned by Transforms.eastNorthUpToFixedFrame.
默认值: Matrix4.IDENTITY
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