new Cesium.VelocityVectorProperty(position, normalize)

A Property which evaluates to a Cartesian3 vector based on the velocity of the provided PositionProperty.
参数名称 类型 默认值 描述信息
position PositionProperty 可选 The position property used to compute the velocity.
normalize boolean true 可选 Whether to normalize the computed velocity vector.
//Create an entity with a billboard rotated to match its velocity.
const position = new Cesium.SampledProperty();
const entity = viewer.entities.add({
  position : position,
  billboard : {
    image : 'image.png',
    alignedAxis : new Cesium.VelocityVectorProperty(position, true) // alignedAxis must be a unit vector


Gets the event that is raised whenever the definition of this property changes.
Gets a value indicating if this property is constant.
Gets or sets whether the vector produced by this property will be normalized or not.
Gets or sets the position property used to compute the velocity vector.


Compares this property to the provided property and returns true if they are equal, false otherwise.
参数名称 类型 描述信息
other Property 可选 The other property.
true if left and right are equal, false otherwise.
Gets the value of the property at the provided time.
参数名称 类型 描述信息
time JulianDate 可选 The time for which to retrieve the value.
result Cartesian3 可选 The object to store the value into, if omitted, a new instance is created and returned.
The modified result parameter or a new instance if the result parameter was not supplied.