Creating periodic curves. Soft corners

#1

Good day to all.

nurbscorner

Is there a cleaner way of creating periodic curves or finishing the curve with soft edges like in the picture? Maybe at least some guide to creating curves correctly so Open/Close command would work as expected.

Thanks

#2

I’d try to break the curve at the beginning and end of one of the straight segments. If this is a degree-3 curve you can build it with 3 equally spaced, colinear points approaching every corner (this would mean six cvs on each segment). If you break the curve in the middle of an arm rather than at a corner you will not have to worry about the closure messing with your tangents.

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#3

Thanks, Theodox. I’ll try this.

Though, it would be good to know if there’s any way of closing a curve correctly. I tried to wrap the last 2 spans over the first 2 spans(using cubic curve). It’s the case with the default nurbs circle i think. But the results are not so useful.