not sure, if it just is not meant to be used that way, but i would like to transform a flat disc (2nd degree with 3x3 control points) with the soft edit srf command to shape some kind of bowl. (the other approaches didn’t bring the desired results: sweep, loft)
unfortunately, fixed edges won’t help with the model, since the control points are outside of the shape. i’m sure, that i am just missing something, right? but i don’t know what.
Hi George - that is a very hard way to make a bowl - Revolve of a profile curve is the first thing that comes to mind - can you post a file or something indicating the desired shape?
If you REALLY had to do it that way, you could make a revolved disc surface to start - make a line that is radius length long, rebuild it with a certain number of control points for later editing, then revolve the line around its endpoint 360° to make an “editable” disc surface, whose points are all on the surface. Then start pulling surface points vertically… Have fun.
The resulting surface will be degree 2 rational with weights other than 1 in the U (circumferential) direction. This can result in curvature discontinuities across the quadrants if control points are moved. To maintain curvature continuity Rebuild or RebuildUV as a degree 3 surface in the U degree, perhaps with 8 control points. Example attached.BowlDC01.3dm (680.3 KB)
Thank you for your suggestions. Once again I realized how little I know about Rhino and next to nothing about surfaces in general.
As I can’t upload files yet, here’s what I did in the end:
Since I had the cross-sections of the bowl I just used the sweep1 command with two of the four half sectional lines selected. Gave me a nasty center, but that wasn’t problematic for the object.
But following your suggestions @pascal, I could have just used the revolve command and trimm the bowl to my liking, in this case.
Soft edit just seemed to be such an intuitive way of surface control.