Strange I can’t figure this one out: how do I open a closed curve? Basically I want to open a closed curve at its seam, while maintaining the exact same shape of the curve - split the seam point into 2. The open curve would have a starting point and an ending point in the exact same place.
Further along these lines : how do I create an open curve, with the start point and the end point are in the same place? When I place my end point, Rhino automatically closes the curve. I suppose I could create the last point away from the start point, then use point snap to place it correctly. Is there another way to do it?
Last question: when I create a curve, Rhino gives a Sharp option. What is a Sharp point, and how do I convert a sharp point into a “dull” point?