How can I get a clean Loft between these cross-section curves?

Rhino Rhino for Windows
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1

Hello,

I’m using Rhino 7 and trying to Loft a surface through several closed cross-section curves stacked at different heights (see images). My end goal is a clean solid I can 3D print.

The problem: between the sections the loft twists and pinches/self-intersects

image 1
image 11366×738 164 KB

With Style: Normal and “Do not simplify” the surface comes out messy.

What I’ve tried (the twisting persists in all of these):

  • Loft Options → Rebuild with 10 control points → still twisted

    image
    image1366×738 172 KB

  • Rebuild with 50 control points → cleaner, but still not usable

    image 2
    image 21366×738 155 KB

  • Running the Rebuild command directly on the input curves, rebuilding both curves to the same values / same control point count

  • Lofting with no rebuild at all

My question: How can I do this Loft properly and get a clean result?

I can attach the .3dm file if that helps. Thanks in advance!

2

Hi @Ercument_Talha_Tayfu
Yes, that ALWAYS helps! But basically, unless your curves are more or less identical in structure, it’s probably better to use Sweep2 and introduce some strategically placed straight lines as the sweep shapes in order to better control where and how the 2 curves are connected.
HTH, Jakob

3

image
image1366×738 123 KB
Thank you.

4

solved ? check the :check_mark: under Normand’s post :white_check_mark:

… also a possible approach for your case:
_extrudeCrvTapered

kind regards - tom