public double PointsPerInch {get; set;}

{
  // Note: call within QueuedTask.Run()
  {
    var def = pointCloudSceneLayer.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
    pointCloudSceneLayer.SetDefinition(def);
  }
}