public abstract class CIMColorRamp : CIMObject, System.ComponentModel.INotifyPropertyChanged, System.Xml.Serialization.IXmlSerializable  

{
    List<string> fields = new List<string>() { "Field1" };
    //Note: Needs QueuedTask to run
    StyleProjectItem styleToUse =
      Project.Current.GetItems<StyleProjectItem>()
          .FirstOrDefault(s => s.Name == "ColorBrewer Schemes (RGB)");
    if (style == null) return;
    //Note: Needs QueuedTask to run
    var colorRampListFound = styleToUse.SearchColorRamps("Red-Gray (10 Classes)");
    if (colorRampListFound == null || colorRampListFound.Count == 0) return;
    CIMColorRamp cimColorRamp = null;
    CIMRenderer renderer = null;

    cimColorRamp = colorRampListFound[0].ColorRamp;
    var rendererDef = new UniqueValueRendererDefinition(fields, null, cimColorRamp);
    renderer = featureLayer?.CreateRenderer(rendererDef);
    featureLayer?.SetRenderer(renderer);
}

{
  // Note: call within QueuedTask.Run()
  {
    var fields = pointCloudSceneLayer.GetAvailablePointCloudRendererFields(
                            PointCloudRendererType.StretchRenderer);
    var stretchDef = new PointCloudRendererDefinition(
                              PointCloudRendererType.StretchRenderer)
    {
      //Will be either ELEVATION or INTENSITY
      Field = fields[0]
    };
    //Create the CIM Renderer
    var stretchRenderer = pointCloudSceneLayer.CreateRenderer(stretchDef)
                                        as CIMPointCloudStretchRenderer;
    //Apply a color ramp
    var style = Project.Current.GetItems<StyleProjectItem>()
                                    .First(s => s.Name == "ArcGIS Colors");
    var colorRamp = style.SearchColorRamps("").First();
    stretchRenderer.ColorRamp = colorRamp.ColorRamp;
    //Apply modulation
    stretchRenderer.ColorModulation = new CIMColorModulationInfo()
    {
      MinValue = 0,
      MaxValue = 100
    };
    //apply the renderer
    pointCloudSceneLayer.SetRenderer(stretchRenderer);
  }
}