Continuing the discussion from Rhino 9 WIP Available Now! : [image] Rhino 9 WIP Available Now! Fillet folds into itself ( RH-87777 ) This is still a fail when I tried it. The fillets and base surface don’t join.

Here is another example of the same sort of thing. extend_error_1mm.3dm (51.1 KB) The fillets are made but the fillets and base surfaces don’t join. The source of the problem is that the fillets should only be extended on the one end. Extending on the end that needs to join is causing join failure…

Revolve surfaces are only used if the rail curves are arcs within document tolerance. The middle input surface has constant radius iso-curves, which means that the fillet can and will be simplified into a revolved surface. And even then, actual revolve surfaces only end up in the fillet when they ar…

[image] Menno Deij - van Rijswijk: Revolve surfaces are only used if the rail curves are arcs within document tolerance. That is not a very good test. For that to work the deviation from an arc would have to be many orders of magnitude smaller than the user tolerance and even then its doubtf…

Thanks @jim , this is very helpful. I agree that this is not good enough and will keep at it. I’m going to either limit the use of revolved surfaces to trimmed spheres only, or see that similar quality checks are made that are applied in FilletEdge when fillet surfaces are simplified to revolved surf…

[image] Menno Deij - van Rijswijk: Some context for why it is what it currently is: I was going off of what you said earlier I think you misunderstood what I said earlier about using a trimmed sphere when two same size fillets collide. What I am talking about in this thread (this bug report)…

I don’t think I misunderstood. Both trimmed-sphere and part-of-a-torus fillets are obtained by attempting to simplify a fillet surface to a surface of revolution. There was a long-outstanding request to convert fillet surfaces in FilletSrf to a surface of revolution, similar to what FilletEdge alrea…

[image] Menno Deij - van Rijswijk: There was a long-outstanding request to convert fillet surfaces in FilletSrf to a surface of revolution The request was to replace the less accurate fillet that FilletSrf made in Rhino8 and before with more accurate revolve surface. There is a difference be…

Replace or convert, the end result is the same: where tolerances allow, the fillet surface is now a revolved surface. I fully agree with doing things at least as well as users can do themselves, and when that is not the case I am here to listen and improve. Just to re-iterate: the example you provi…

Surface filleting across Tangent faces bugs

Serengeti (Rhino WIP)

brian (Brian Gillespie) June 25, 2025, 4:27pm 12

RH-87913 is fixed in Rhino WIP

Topic		Replies	Views
BUG: Join destroys the surfaces Rhino for Windows windows , rhino7	4	348	December 28, 2023
Torus as Fillet Rhino for Mac mac	8	699	June 25, 2025
FilletSrf creates "nirvana shots" / ray s into infinity (Bug) Rhino for Mac mac	4	511	May 6, 2022
Surface Filleting across Tangent Faces Serengeti (Rhino WIP)	59	2236	July 13, 2025
Rhino WIP Feature: FilletSrf improvements Serengeti (Rhino WIP) filletsrf , chamfersrf	95	8984	May 12, 2026

Surface filleting across Tangent faces bugs

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