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

/// <summary>
/// Creates Mesh procedural symbol with various textures.
/// ![MeshProceduralTexture](https://ArcGIS.github.io/arcgis-pro-sdk/images/Symbology/mesh-procedural-texture.png)
/// Note: The rule package used in this method can be obtained from the Sample Data included in the arcgis-pro-sdk-community-samples repository.
/// </summary>
{
  //Note: Run withing QueuedTask
  string _rulePkgPath = @"C:\Data\RulePackages\MultipatchTextures.rpk";
  CIMSymbolLayer[] proceduralSymbolLyr =
          {
              new CIMProceduralSymbolLayer()
              {
                  PrimitiveName = "Textures",
                  RulePackage = _rulePkgPath,
                  RulePackageName = "Textures",
              }
          };
  var meshProceduralTextureSymbol = new CIMMeshSymbol()
  {
    SymbolLayers = proceduralSymbolLyr
  };
}

/// <summary>
/// Create a procedural symbol that can be applied to a polygon building footprint layer
/// ![ProceduralSymbol](https://ArcGIS.github.io/arcgis-pro-sdk/images/Symbology/polygon-procedural.png)        
/// Note: The rule package used in this method can be obtained from the Sample Data included in the arcgis-pro-sdk-community-samples repository.
/// </summary>    
{
  //Note: Run withing QueuedTask
  string _rulePkgPath = @"C:\Data\RulePackages\Venice_2014.rpk";
  //Polygon symbol to hold the procedural layer
  var proceduralSymbol = SymbolFactory.Instance.ConstructPolygonSymbol();

  //Array of layers to hold a procedural symbol layer
  CIMSymbolLayer[] proceduralSymbolLyr =
        {
            new CIMProceduralSymbolLayer()
            {
                PrimitiveName = "Venice Rule package 2014",
                RulePackage = _rulePkgPath,
                RulePackageName = "Venice_2014",
            }
  };
  proceduralSymbol.SymbolLayers = proceduralSymbolLyr;
  //To apply the symbol to a polygon feature layer
  //var renderer = theLayer.GetRenderer() as CIMSimpleRenderer;
  //renderer.Symbol = proceduralSymbol.MakeSymbolReference();
  //theLayer.SetRenderer(renderer);
}