What’s the usage of the Snap to line option in the Control point window? The option seems to be active in the default mode, but I don’t see any change when I set it off.
If the feature is enabled and when moving a control point, DELFTship checks if the control point is close to a line through the neighboring points. If this is the case then the point will be snapped to that line. See also the pictures below. This feature is meant to preserve straight lines and flat surfaces.
The image below shoes 2 green lines: The control point will be snapped to the line through point 1 and 2.
On the following image the point will be snapped to the intersection of the line through point 1 and 2 with the line through point 3 and 4