Region Grow Cylinder
This command extracts a cylinder according to seed points and visible objects.
Requirements
To extract a cylinder, launch the command and click seeds on objects.
You can force the radius, the center or the axis :
Set the Extraction tolerance.
Click a seed point.
to click a 
to define a Notes
Once a seed point is clicked, the computation is launched. You can cancel the current computation by pressing ESC or by clicking another point. You can do the computation on several seed points by clicking multiple points.
Sometimes, when you compute a cylinder, 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 cylinder is present. In this case, you can try to click a new point to add seed points or to delete the previous clicked point by pressing DEL key, and click another one.