Solved! Go to Solution.
The points you see highlighting when moving the cursor over geometry on the screen are Snap Points - guiding to the desired/required selection while creating e.g. a line from one point to another. Curve/Edge enteties Snap Points are definied by the type of curve and creation parameters. You can tune the Snap Point filter to what points you want to snap to at the top on the Top Border Bar. Sould you desire not to snap to these points at all you can toggle it off compleetely, see the attached image of the Snap Points on the Top Border Bar. The "ghost" of snap points will remain while in teh creation process in a function, you can use F5 to refresh and make them go away. The snap points will disapear when exiting a function.
From what I've seen...
NX selects the arc center if the center of the selection circle/crosshairs is INSIDE the arc
NX selects the _arc_ if the center of the selection circle/crosshairs is OUTSIDE the arc (not sure what point it selects if you can only select points)
Production: NX10.0.3.5 MP16/TC11.2
I'd rather be e-steamed than e-diseaseled
This is due to smart selection behavior. The Green Circle in your part is an Explicit Cure (no feature - doesn't show in the PNT - this is a legacy type of curve). The Blue Circle in your part is a Curve Feature and shows up in the PNT. There is a difference in behavior of these curves. The explicit curve can be edited but have no associative behavior. The Curve Feature (Blue) is fully associative and will modified if related to any other geometry changing while editing a part. The smart selection behavior indicates what type the curves are and how you can edit them or associate the with other geometry (dependency). With the selection filter set to "No Selection Filter" a behavior based on how most people like to filter through the entities and uses a selection hierarchy where the feature is at the top and favored. How and what you select helps you create/edit what you want e.g if you are creating a line you might want it to start from the center of the arc or at the tangent of the arc. The Snap Points indicate the way you should select and helps to you guide you to the desired behavior for what you are about to create/edit. Clicking on the inside of the arc (still touching the arc) or on the snap point at the center will snap the start of the line from the center point, clicking on the outside but still on the arc will give you a line starting tangentially from the arc…. Setting the selection filter to “Curve” will give you the same behavior for both the curves in your model.