| Interface | Description | 
|---|---|
| GeometryComparator | 
GeometryComparator is a special version of Comparator
 that is used to sort geometries for rendering in the RenderQueue. | 
| Class | Description | 
|---|---|
| GeometryList | 
 This class is a special purpose list of  
Geometry objects for render
 queuing. | 
| GuiComparator | 
GuiComparator sorts geometries back-to-front based
 on their Z position. | 
| NullComparator | 
NullComparator does not sort geometries. | 
| OpaqueComparator | |
| RenderQueue | 
RenderQueue is used to queue up and sort 
 geometries for rendering. | 
| TransparentComparator | 
| Enum | Description | 
|---|---|
| RenderQueue.Bucket | 
 The render queue  
Bucket specifies the bucket
 to which the spatial will be placed when rendered. | 
| RenderQueue.ShadowMode | 
ShadowMode is a marker used to specify how shadow
 effects should treat the spatial. |