public TinFaceClassBreaksRendererDefinition()

{
  var tinCP_renderers = new TinLayerCreationParams(tinDataset)
  {
    Name = "My TIN layer",
    IsVisible = true
  };

  // define the node renderer - use defaults
  var node_rd = new TinNodeRendererDefinition();

  // define the face/surface renderer
  var face_rd = new TinFaceClassBreaksRendererDefinition();
  face_rd.ClassificationMethod = ClassificationMethod.NaturalBreaks;
  // accept default color ramp, breakCount

  // set up the renderer dictionary
  var rendererDict = new Dictionary<SurfaceRendererTarget, TinRendererDefinition>
{
  { SurfaceRendererTarget.Points, node_rd },
  { SurfaceRendererTarget.Surface, face_rd }
};

  // assign the dictionary to the creation params
  tinCP_renderers.RendererDefinitions = rendererDict;
  // Note: Needs QueuedTask to run
  {
    // create the layer
    var tinLayer_rd = LayerFactory.Instance.CreateLayer<TinLayer>(tinCP_renderers, MapView.Active.Map);
  }
}

{
  var terrainCP_renderers = new TerrainLayerCreationParams(terrain);
  terrainCP_renderers.Name = "My LAS Layer";
  terrainCP_renderers.IsVisible = true;

  // define the edge type renderer - use defaults
  var edgeRD = new TinBreaklineRendererDefinition();

  // define the face/surface renderer
  var faceRD = new TinFaceClassBreaksRendererDefinition();
  faceRD.ClassificationMethod = ClassificationMethod.NaturalBreaks;
  // accept default color ramp, breakCount

  // define the dirty area renderer - use defaults
  var dirtyAreaRD = new TerrainDirtyAreaRendererDefinition();

  // add renderers to dictionary
  var t_dict = new Dictionary<SurfaceRendererTarget, TinRendererDefinition>();
  t_dict.Add(SurfaceRendererTarget.Edges, edgeRD);
  t_dict.Add(SurfaceRendererTarget.Surface, faceRD);
  t_dict.Add(SurfaceRendererTarget.DirtyArea, dirtyAreaRD);

  // assign dictionary to creation params
  terrainCP_renderers.RendererDefinitions = t_dict;
  // Note: Needs QueuedTask to run
  {
    //Create the layer to the terrain
    var terrainLayer_rd = LayerFactory.Instance.CreateLayer<TerrainLayer>(terrainCP_renderers, map);
  }
}