Autodesk Developer Network 2011
Autodesk
Point Cloud Client API 
§Tools to interact with the user
§PointCloudInstance.SetSelectionFilter()
§PointCloudInstance.FilterAction – Highlight/Isolate
§Selection.PickBox()
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§e.g. prompt the user to select a portion of the cloud, and creates a highlight  
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There are two API tools to help client applications interact with the user:
The SetSelectionFilter method and FilterAction property of PointCloudInstance allows API users to specify volumetric filter to a cloud. The parts of the cloud that pass this filter will be rendered differently from the rest of the cloud, with highlighting done with blue highlight color.
Selection.PickBox() invokes a two click selection that lets users specify a rectangular area on the screen. This returned box generates a filter and either highlights or isolates the selected points in the cloud.