public class CIMMaterialSymbolLayer : CIMSymbolLayer, System.ComponentModel.INotifyPropertyChanged, System.Xml.Serialization.IXmlSerializable  

/// <summary>
/// Create a mesh symbol that can be applied to a multi-patch feature layer.
/// A mesh symbol is a CIMMeshSymbol object.  Define an array of CIMSymbolLayers which contains a CIMMaterialSymbol layer with the specified properties such as Color, etc.
/// Assign this array of CIMSymbolLayers to the CIMMeshSymbol.
/// ![MeshSymbolOrange](https://ArcGIS.github.io/arcgis-pro-sdk/images/Symbology/mesh-material-orange.png)
/// </summary>
{
  //Note: Run withing QueuedTask
  CIMSymbolLayer[] materialSymbolLayer =
        {
              new CIMMaterialSymbolLayer()
              {
                  Color = ColorFactory.Instance.CreateRGBColor(230,152,0),
                  MaterialMode = MaterialMode.Multiply
              }
         };
  var meshMaterialFillSymbol = new CIMMeshSymbol()
  {
    SymbolLayers = materialSymbolLayer
  };
}