public Geometry FilterGeometry {get; set;}

// must be on MCT 

// create the filter
var filter = new LasPointSelectionFilter();
// set the filter geometry
// don't set VisiblePoints, ClassCodes - use the existing layer values
filter.FilterGeometry = geometry;

// perform the selection
var selCount = await lasDatasetLayer.SelectAsync(filter, SelectionCombinationMethod.New);

// set up a second filter and configure the VisiblePoints, ClassCodes
// note that the ClassCodes is using only (4,5)
// whereas the layers setting is (3,4,5)
var filter2 = new LasPointSelectionFilter();
filter2.VisiblePoints = true;
filter2.ClassCodes = new List<int>() { 4, 5 };
filter2.FilterGeometry = geometry;

// perform the selection
selCount = await lasDatasetLayer.SelectAsync(filter2, SelectionCombinationMethod.New);

// must be on MCT 

var clusterFilter = new LasPointClusterSelectionFilter();
clusterFilter.VisiblePoints = true;
clusterFilter.ClassCodes = new List<int>();  // empty list means all classification codes
clusterFilter.FilterGeometry = geometry;

clusterFilter.SearchRadius = 0.5; // meters
clusterFilter.MaximumNumberOfPoints = 500;

var clusterSelCount = await lasDatasetLayer.SelectAsync(clusterFilter, SelectionCombinationMethod.New);

// must be on MCT 

var planeFilter = new LasPointPlaneSelectionFilter();
planeFilter.VisiblePoints = true;
planeFilter.ClassCodes = new List<int>();  // empty list means all classification codes
planeFilter.FilterGeometry = geometry;

planeFilter.ClusteringDistance = 0.3; // meters
planeFilter.MaximumDistance = 500;
planeFilter.PlaneTolerance = 0.152; // meters

var planeSelCount = await lasDatasetLayer.SelectAsync(planeFilter, SelectionCombinationMethod.New);

// must be on MCT 

var railFilter = new LasPointRailSelectionFilter();
railFilter.VisiblePoints = true;
railFilter.ClassCodes = new List<int>();  // empty list means all classification codes
railFilter.FilterGeometry = geometry;

// configure a few of the properties and accept defaults for others
railFilter.SearchRadius = 0.5; // meters
railFilter.RailThickness = 0.2; // meters
railFilter.MaximumLength = 225; // meters

var railSelCount = await lasDatasetLayer.SelectAsync(railFilter, SelectionCombinationMethod.New);

// must be on MCT 

var pipelineFilter = new LasPointPipelineSelectionFilter();
        
pipelineFilter.VisiblePoints = true;
pipelineFilter.ClassCodes = new List<int>();  // empty list means all classification codes
pipelineFilter.FilterGeometry = geometry;

// configure a few of the properties and accept defaults for others
pipelineFilter.ApplyWindCorrection = true;
pipelineFilter.MinimumLength = 25;  // meters

var pipelineSelCount = await lasDatasetLayer.SelectAsync(pipelineFilter, SelectionCombinationMethod.New);