Unlike the best feature computation commands which use all points of an object, the commands to extract features try to find the best feature from a seed of point(s).
Open the file AlignOnRef.3dr.
Circle
To extract the dimensions of a hole in this mechanical part, launch Region Grow Circle. Set the Extraction tolerance to 0.5 mm and click a point close to the border of the hole (the point has to be given on the planar side).
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You can set some parameters (Center, Normal, Radius). The distance between the extracted feature and the original points is visualized using the color gradient.
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You can generate a measure or the extracted points if you wish by checking the corresponding options.
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Click OK, Next to validate the circle or OK, Exit to validate and exit the command.
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You can use the region grow for all geometric features (except cones)
