public class LasStretchRendererDefinition : TinRendererDefinition 

{
  var lasCP_renderers = new LasDatasetLayerCreationParams(lasDataset);
  lasCP_renderers.Name = "My LAS Layer";
  lasCP_renderers.IsVisible = false;

  // create a point elevation renderer
  var ptR = new LasStretchRendererDefinition();
  // accept all defaults

  // create a simple edge renderer
  var edgeR = new TinEdgeRendererDefintion();
  // accept all defaults

  // add renderers to dictionary
  var l_dict = new Dictionary<SurfaceRendererTarget, TinRendererDefinition>();
  l_dict.Add(SurfaceRendererTarget.Points, ptR);
  l_dict.Add(SurfaceRendererTarget.Edges, edgeR);

  // assign dictionary to creation params
  lasCP_renderers.RendererDefinitions = l_dict;
  // Note: Needs QueuedTask to run
  {
    //Create the layer to the LAS dataset
    var lasDatasetLayer_rd = LayerFactory.Instance.CreateLayer<LasDatasetLayer>(lasCP_renderers, map);
  }
}

{
  var elevLasStretchRendererDef = new LasStretchRendererDefinition(ArcGIS.Core.CIM.LASStretchAttribute.Elevation);
  // accept the defaults for color ramp, etc

  if (lasDatasetLayer.CanCreateRenderer(elevLasStretchRendererDef))
  {
    CIMTinRenderer renderer = lasDatasetLayer.CreateRenderer(elevLasStretchRendererDef);
    if (lasDatasetLayer.CanSetRenderer(renderer, SurfaceRendererTarget.Points))
      lasDatasetLayer.SetRenderer(renderer, SurfaceRendererTarget.Points);
  }
  // OR use a stretch renderer with stretchType standard Deviations
  var elevLasStretchStdDevRendererDef = new LasStretchRendererDefinition(ArcGIS.Core.CIM.LASStretchAttribute.Elevation);
  elevLasStretchStdDevRendererDef.StretchType = LASStretchType.StandardDeviations;
  elevLasStretchStdDevRendererDef.NumberOfStandardDeviations = 2;
  // accept the defaults for color ramp,  etc
  // Note: Needs QueuedTask to run
  {
    if (lasDatasetLayer.CanCreateRenderer(elevLasStretchStdDevRendererDef))
    {
      CIMTinRenderer renderer = lasDatasetLayer.CreateRenderer(elevLasStretchStdDevRendererDef);
      if (lasDatasetLayer.CanSetRenderer(renderer, SurfaceRendererTarget.Points))
        lasDatasetLayer.SetRenderer(renderer, SurfaceRendererTarget.Points);
    }
  }
}