Create this by calling 
A renderable polyline.
PolylineCollection#add. Do not call the constructor directly.
See:
Members
distanceDisplayCondition : DistanceDisplayCondition
    Gets or sets the condition specifying at what distance from the camera that this polyline will be displayed.
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    Default Value:
    
 
undefined
    
    
    
    
    
    
    
    Gets or sets the user-defined value returned when the polyline is picked.
    Gets or sets whether a line segment will be added between the first and last polyline positions.
material : Material
    Gets or sets the surface appearance of the polyline.  This can be one of several built-in 
Material objects or a custom material, scripted with
Fabric.
positions : Array.<Cartesian3>
    Gets or sets the positions of the polyline.
Example:
polyline.positions = Cesium.Cartesian3.fromDegreesArray([
    0.0, 0.0,
    10.0, 0.0,
    0.0, 20.0
]);
    
    
    
    
    
    
    Determines if this polyline will be shown.  Use this to hide or show a polyline, instead
of removing it and re-adding it to the collection.
    Gets or sets the width of the polyline.
