Region Grow Circle

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The use of this command differs from other commands. Instead of selecting objects before entering the command, you can launch the command and use the visible objects to define the input for the computation.

To extract a circle, launch the command and click a seed on objects.

Note

Once a starting point is clicked, the computation is launched. You can cancel the current computation by pressing ESC or by clicking another point.
A starting point is a seed from which an ideal shape is computed.

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You can force a Point by clicking on the lock. You can either enter the XYZ coordinates in the edit controls or click on the icon to click a point in the scene.
You can force a Normal by clicking on the lock. You can either enter the XYZ values of the vector in the edit controls or click on the icon to define a Direction in the scene.
You can force the Radius by clicking on the lock and then, define the value.
As outputs, choose to have the extracted circle, a cloud containing all extracted points, and the label.
Validate the command with OK or close the dialog box with Cancel. You can create several shapes one after the other using the Ok, Next button.

Sometimes, when you compute a circle, an incorrect extraction may occur with the point you click if, at this place, the noise disturbs the local curvature evaluation or if only a part of the circle is present.

In this case, click a new point to replace the current seed point.

The Extraction tolerance corresponds to the extraction of the plane which contains the circle (Extraction performed in two steps: plane and contour extractions).