This class represents a change of material during a model-exporting process. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2014 
Syntax
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Remarks
Output nodes following this node are to be assumed using the material. The material remains in effect until another material node is sent to the output.
See also: [!:Autodesk::Revit::DB::IExportContext::OnMaterial] .