A ParticleEmitter that emits particles within a box.
Particles will be positioned randomly within the box and have initial velocities emanating from the center of the box.
    
| Name | Type | Description | 
|---|---|---|
| dimensions | Cartesian3 | The width, height and depth dimensions of the box. | 
Members
dimensions : Cartesian3
    The width, height and depth dimensions of the box in meters.
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    Default Value:
    
new Cartesian3(1.0, 1.0, 1.0)
    
    
    
    
    
    
    
