I don’t know how to create a fillet here. _FilletEdge doesn’t work. I attached screenshots and the model file. [keyviz_Qlpa1Mf3df] My model: Nose v9-triangle-f.3dm Google Drive file. [keyviz_SsEyQEOiuA] [keyviz_juSmAtY3P8]

What is your design intent at the ends of the fillet? Do you want the fillet size to go to zero, or something else? What kind of fillet do you want - circular arc or smooth blend?

Looks like variable blend on the surfaces. To get there maybe a pipe cut with surf blend or 2 rail sweep with some profile curves. That would be my guess. ----Mark

The fillet indicated can be done with FilletEdge, but you need to join the surfaces first to get an edge that can be filleted. If you put extra handles at the start and end of the edge and set their radius to zero, you’ll get a fillet surface out of this, but it won’t trim the surfaces by itself. T…

I did this quick test with BlendSrf and Patch-Untrimmed. It’s not perfect yet, but you can take inspiration from it. fusoliera.3dm (1.7 MB) [fggsggergr] [gfregsgegfwg] [image] Rhino WIP Feature: Patch re-implemented Serengeti (Rhino WIP) Rhino WIP has a com…

Start - 0, then towards the middle the radius is 4 and towards the end also 4. Smooth blend is preferable to just an arch. I’ll try doing it with a pipe, trim, blend as @markintheozarks recommended, and then using Patch at the end of the fillet as @brvdln recommended. I’m not sure this is the bes…

[image] Robert Evt: I don’t know how to create a fillet here. Do you have a V8 compatible file? What is the design intention on both ends of the fillet? Will there also have to be a fillet along the upper edge?

Thanks a lot for your help. But the geometry in Lightlines’ check leaves much to be desired. :slight_smile: I made it using part of your method: [image] And it turned out really well, so thank you very much! -Robert

Sorry, but due to this reason: Cannot save my file! [Rhino 9] I can’t save my model And there’s no need to create a fillet on the upper edge — only on the lower one. -Robert

@Robert_Evt Yes, I think other users would have used more or less the same method too. Step 1) Use Pipe to cut the two adjacent surfaces. In general, it’s still better than using the Fillet/Blend Edge command. Step 2) BlendSrf. The fact that it created that small defect was probably caused by the…

How can I create a smooth fillet here?

Rhino

brvdln (Brv) May 8, 2026, 7:09am 5

I did this quick test with BlendSrf and Patch-Untrimmed. It’s not perfect yet, but you can take inspiration from it.
fusoliera.3dm (1.7 MB)

With a bit more work, this area could be improved further.

There was a defect created earlier with BlendSrf that you can also fix using Patch.

after

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How can I create a smooth fillet here?

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