I don’t know how to create a fillet here.
_FilletEdge doesn’t work.
I attached screenshots and the model file.
My model:
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. That can be done by duplicating the edges, then using these to trim away the surface excess.
The other edge is more difficult, and I could not use the same approach: the trimming step fails there in the pinched corner - the question is, like @davidcockey said, what is the design intent at the end of the fillet?
Nose v9-triangle-f_MDvR_1_edge.3dm (264.8 KB)
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
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 best option. I’d be happy if you could suggest something better or a better way to implement my idea.
-Robert
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?
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 edge I had split earlier… most likely. I didn’t go too deep into details because I just wanted to show you a possible workflow direction. How to handle the blending and refinement afterwards was up to you — mine was only meant as a guideline.
Step 3) Try Rhino’s Patch command, because internally it has several different solving modes and behaviors (Molded, MultiBlend, Untrimmed, etc.). If you know XNurbs, some of the logic is quite similar.
I also recommend trying the Cyberstrak plug-in.
I suggest you watch this tutorial by @theoutside
