in case of overlapping footprints points are automatically assigned to the 'best' candidate footprint. Best is defined in terms of highest building point coverage and highest mean building point elevation.
classify each input footprint as sufficient or insufficient based on how many building points are available for that building in relation to the area of the footprint and how that compares to other footprints in the input. Thus if a building has a much lower building point coverage than average it is classified as insufficient.
An insufficient point coverage happens eg. for 'underground' buildings, or a building below another building, or buildings that are newer than the point cloud acquisition.
Several improvements to the LASInPolygons node:
An insufficient point coverage happens eg. for 'underground' buildings, or a building below another building, or buildings that are newer than the point cloud acquisition.