Strategies/Tutorials for compound curved surfacing? Help me draw this swooshy thing?

I’m trying to make an edge profile on a flat wood slab turn 90 degrees on two axes simultaneously. I’ve gotten close to the desired result, but it was quite tedious to do, with lots of trial and error. Looking for advice on how to do it efficiently, and where I might find tutorials on advanced surfacing that will help me understand this kind of thing better. Paid tutorials are fine.

Anyway, here’s what I’m attempting:

Top and front view:

(trying to get a 3 unit radius in both directions)

Perspective view, with isocurves:

Zebras, close enough for woodwork that will get sanded, but I’d like to know how to do better:

And here’s how I made the network surface:

Creating this curve network was tedious. I did it by taking the rail curves, dividing them, placing edge profile curve for the flat slab along them, rotating and aligning them to the normals of the rail curves, and then control point editing them to make them fit as close as possible to the rails. Then I created a network surface, extracted isocurves from it, rebuilt them and tweaked them, and recreated a network surface using more curves in order to try to keep the form tight.

Even after that, the network surface I created bulged outside of the area I was trying to stay within by quite a bit, and I had to do a bunch of splitting and blending to get the finished transition to fit where it’s supposed to be.

Is there a better way to do this? A more efficient way?
Is there better command to use in this context than Networksrf?(sweep 2 couldn’t do it)
Are there tutorials, online classes, or other resources that cover this subject in detail?

hi, if you post what you have by now, at least the input curves, it will increase your chance of getting help. there are some very motivated guys around who would rebuild it from plain sight, but even that depends very much on the weather :slight_smile: generally i would advise against network surface.

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Post a file, you mean?

Yes. Because that would svae anyone wanting to help from doing a lot of work which you have already done. This is the part that increases your chances of getting help - being helpful. :wink:

// Rolf

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OK, here’s a relatively clean file.

Layer “massing/basis” is a simplified version the form I’m trying to get an edge profile to conform to.

Layer “Attempts” is two different curve networks I tried to use to get it to work, with construction curves and guide curves in separate sublayers.
Layer “goal” is as close as I got to what I wanted.

swoosh help.3dm (3.6 MB)

Here’s some of what I want to fix. Note how the network surface goes beyond the guide curves, a lot below, and a little above. Below, I couldn’t figure out any fix. Above, I just lopped it off and tried to blend it. But I’d rather find a way to constrain it more precisely when I make the curve network or use a different method altogether to create the shape.