Rhino 9 potential bug

[artesmith]

potential Rhino 9 (9.0.26251.12303, 9/8/2026) trim bug:

FilletSrf

trim resulting surface with plane of symmetry

explode resulting fillet surface

extend resulting fillet surface with extendSrf

trim FAILS with two surfaces And with the surface & line of intersection And with the surface & extended dupedged edge… see image below and included file

Rhino 9 potential bug.3dm (37.6 KB)

[dale (Dale Fugier)]

Hi @artesmith,

You posted an empty .3dm file.

– Dale

[artesmith]

sorry!

Rhino 9 potential bug.3dm (805.6 KB)

[wim (Wim Dekeyser)]

Hi Artesmith -

@artesmith

Rhino 9 potential bug.3dm (805.6 KB)

Thanks.
→ RH-98856 Trim: Failure Case
-wim

[artesmith]

what’s the prognosis on RH-98856 ?

Art

[Gijs (Gijs de Zwart)]

@artesmith

what’s the prognosis on RH-98856

The best prognosis is its release target, which is currently set to Future. Future generally means ‘not anytime soon’ but release targets also change over time.

If you need a workaround: use SrfSeam to move the surface seam of the surface away from the intersection curve