public class CIMTerrainPointElevationRenderer : CIMTinColorRampRenderer, System.ComponentModel.INotifyPropertyChanged, System.Xml.Serialization.IXmlSerializable  

// applies to Terrain layers only

var terrainPointClassBreaks = new TerrainPointClassBreaksRendererDefinition();
// accept defaults

if (terrainLayer.CanCreateRenderer(terrainPointClassBreaks))
{
  CIMTinRenderer renderer = terrainLayer.CreateRenderer(terrainPointClassBreaks);
  if (terrainLayer.CanSetRenderer(renderer, SurfaceRendererTarget.Points))
    terrainLayer.SetRenderer(renderer, SurfaceRendererTarget.Points);
}