Alternative to loft for NURBS?

Hello, I am trying to construct a complex NURBS surface (it’s just a portion of it in these screengrabs) but the way Loft has been working has been adding continuous bumps to the surface. This is a series of interpolative curves (all with the same number of control points) being lofted yet when the pattern moves to a 45deg relationship to the curve direction the loft begins to create micro bumps following the iso curve of the surface. I’m certain this is due to the lofting. Does anyone have any alternative ways to create this surface?

211124_LoftHelp.3dm (19.8 MB)




Hello - That will be hard to get really clean I would say - really you want the control points to flow in the same way as the ridges and that will be tricky on a surface. You might get there more easily using SubD but probably not using all of these curves except as reference.
@theoutside - do you think this is a SubD thing?

-Pascal

Thanks for the prompt response Pascal :slight_smile:
If you can’t tell, it is from a displacement map so yeah the control points are clearly not aligned to the pattern. Originally this was a mesh which I smoothed which mostly worked…but for fabrication I need it to be in NURBS which is causing this issue.

Thats an easy subD model for sure.

I agree but this is just part of a larger model which isnt as simple to model in SubD :slight_smile:

Do you have the original mesh slice? You could QuadRemesh the section that you need and then convert it to a Nurbs surface.

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This was actually one of the most interesting solutions. QuadRemesh, smoothing some, converting to SubD, and then converting to NURBS. Not the most beautiful process but a pretty smart little hack. Thanks

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An alternative approach:

Create the straight (not angled) ridges on a flat model with the ridges aligned with iso-curve and the control point network. This set of ridges needs to be larger than the final shape.

Flow the ridges onto a a portion of a cylinder,

Twist

Trim to the desired “rectangle”

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