Hi, on your example, you are starting from a D shape with two sharp corners… no matter how smooth the transition is, at the very beginning there will be a sharp crease. You can smooth it out along the transition, but at the very beginning there will be a crease :
@bigjimslade Can you post a .3dm file with the rippled surface? What Rhino commands are you using to create that surface? You mention “sweeps” but the file you posted above does not have sufficient curves for Sweep1 or Sweep2.
Third solution. Surface appeared to have wiggles with the render mesh settings in @bigjimslade original file. Refined render mesh settings and apparent wiggles disappeared. Problem Prop DC2.3dm (175.6 KB)
I’d handle this with multiple surfaces. Start with using Curve interpolate points. To set the split points on the Degree 2 circle. Then use loft making sure to use the to point option. Then it’s just a matter of matching, point editing and remove knots to get a clean polysurface.
This is typical with lofting polycurves to single curves. Rhino can’t figure out a solution with varying point and knot counts. You could split the single curve to match the knot and point counts of the polycurves. Or just run rebuild option within the Loft command. Other cad packages will just run their own rebuild option without you knowing.