Auto Filter to Nominal 2D Geometry

2D Geometry extraction is a specialized subset of the Compare to Nominal Geometry function used for holes (circles and slots). Its an older alternative to the 2D Circles and Slot extractions now available in the Feature Cloud Point Proximity Filter.

It can be used to perform feature extraction from a point clouds based upon proximity to nominal geometry, where only a surface scan is available, such as with sheet metal. This alternative Filter to Nominal function uses the same dialog as the 3D Geometry extraction tool with the addition of a tolerance and two processing buttons:

The 2D Geometry extraction process is performed in 2 steps:

  1. The Auto Filter Button should first be use to extract mini clouds in close proximity to nominal geometry in order to isolate and identify the cloud points of interest (use the settings button to set filtering and extraction depth to built the mini clouds).

  2. The Extract button can then be used to build the extracted circle points and associate them automatically with the generated relationship.

The extraction process will delete the referenced mini-cloud built from the auto-filter process and automatically associate the extracted points to the relationship as long as a circle fit can be achieved within the specified tolerance. If it cannot identify geometry, it will not remove the filtered cloud so that a manual inspection is possible. For additional information on the tolerance settings see “Extraction Tolerance” . The Auto Set option when enabled will adjust the tolerance based on the maximum radius over all active nominals.

All filter settings are disabled in 2D Geometry extraction mode except for the depth control which is still used to determine how far above or below the nominal hole plane data is collected.