Rhino WIP has many improvements to the fillet and chamfer commands: FilletSrf, ChamferSrf, FilletSrfCrv, and FilletSrfToRail Continue across faces option for FilletSrf and ChamferSrf. Simplified (revolved) surface for FilletSrf and ChamferSrf where possible. Interactive Dialog for ChamferSrf. Bett…

And a YT for improving FilletSrf’s ability to trim adjacent, non-filleted surfaces is here RH-94977 .

I can’t open the link. Perhaps the YT uses some private 3dm model? There are a few ways to build same radius fillet adjacent from an existing one(s), but none of them is 100% reliable. One of them is @jim ’s script from this thread, which works in 90-95% of the time: [image] …

[image] Bobi: There are a few ways to build same radius fillet adjacent from an existing one(s), but none of them is 100% reliable. One of them is @jim ’s script from this thread, which works in 90-95% of the time: I would be curious to see examples where the same size ball fillet fails. The …

In this example, the fillet works good, but not the trimming. [image] FilletEdgeFailed_02 (1).3dm (598.3 KB)

Is this meant to be a stress-test/worst-case-scenario?

[image] norbert_geelen: Is this meant to be a stress-test/worst-case-scenario? What else could that be. Fillet works well. Trimming doesn’t. Try this simple example: [image] 2026-05-20_NoTrim_Simple.3dm (62.1 KB)

Was just asking because of the extremely fragmented surfaces. It was meant as a genuine question. FWIW, your last, simple example works here for filletsrf as well as fillet edge (filleting AND trimming)

Rhino WIP Feature: FilletSrf improvements

Serengeti (Rhino WIP)

brian (Brian Gillespie) May 12, 2026, 11:11pm 98

RH-88865 is fixed in Rhino WIP

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Rhino WIP Feature: FilletSrf improvements

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