While in contour selection mode, you can right-click to open a popup menu that includes the following selection options:
To extend contours:
Pick the first contour.
Pick the next contour. If the contours do not intersect, they will be extended until the intersection point is found.
The resulting contour is shown in green.
To trim contours:
Pick the first contour. When picking, the point at which the contour is selected defines which section of the contour will remain after trimming.
Pick the next contour.
The resulting contour is shown in green.
In NC, the system looks for a closed contour on the XY plane. Pick the first contour.
Automatic Chain: selecting a contour by picking a surface.
If you pick adjacent surfaces, the contour that encloses all surfaces will be selected
Use this option to create a chain between a start and end contour. If the chain can proceed in more than one direction, the shortest chain will be created.
Pick the start contour.
Choose the direction in which the chain will proceed. The direction can be flipped by clicking on the arrow head.
Pick the end contour.
The resulting chain is shown in green.
