public sealed class PointCloudSceneLayer : Layer, ArcGIS.Desktop.Core.IMetadataInfo, IMetadataSource, System.ComponentModel.INotifyPropertyChanged  

var pcsl = MapView.Active.Map.GetLayersAsFlattenedList()
               .OfType<PointCloudSceneLayer>().FirstOrDefault();
var scenelayerName = pcsl?.Name;

//Must be called on the MCT
//var pcsl = ...;
var def = pcsl.GetDefinition() as CIMPointCloudLayer;
//Get the ColorModulation off the renderer
var modulation = def.Renderer.ColorModulation;
if (modulation == null)
  modulation = new CIMColorModulationInfo();
//Set the minimum and maximum intensity as needed
modulation.MinValue = 0;
modulation.MaxValue = 100.0;
//apply back
def.Renderer.ColorModulation = modulation;
//Commit changes back to the CIM
pcsl.SetDefinition(def);

//Must be called on the MCT
//var pcsl = ...;
var def = pcsl.GetDefinition() as CIMPointCloudLayer;

//Set the point shape and sizing on the renderer
def.Renderer.PointShape = PointCloudShapeType.DiskShaded;
var pointSize = new CIMPointCloudFixedSizeAlgorithm()
{
  UseRealWorldSymbolSizes = false,
  Size = 8
};
def.Renderer.PointSizeAlgorithm = pointSize;
//Commit changes back to the CIM
pcsl.SetDefinition(def);

//Must be called on the MCT
//var pcsl = ...;
var def = pcsl.GetDefinition() as CIMPointCloudLayer;

//Set the point shape and sizing on the renderer
def.Renderer.PointShape = PointCloudShapeType.DiskFlat;//default
var scaleSize = new CIMPointCloudSplatAlgorithm()
{
  MinSize = 8,
  ScaleFactor = 1.0 //100%
};
def.Renderer.PointSizeAlgorithm = scaleSize;
//Commit changes back to the CIM
pcsl.SetDefinition(def);

//Must be called on the MCT
//var pcsl = ...;
var def = pcsl.GetDefinition() as CIMPointCloudLayer;
//PointsBudget - corresponds to Display Limit on the UI
// - the absolute maximum # of points to display
def.PointsBudget = 1000000;

//PointsPerInch - corresponds to Density Min --- Max on the UI
// - the max number of points per display inch to renderer
def.PointsPerInch = 15;
//Commit changes back to the CIM
pcsl.SetDefinition(def);