Unmaps the buffer so that it can be used for rendering. 
   Namespace:   Autodesk.Revit.DB.DirectContext3D  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2017 
Syntax
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Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions InvalidOperationException | This IndexBuffer is not available because Revit is not currently rendering. In general, this IndexBuffer must be used in the scope of the RenderScene() callback of IDirectContext3DServer. |