Is there a way to click on a surface or solid fillet that does not have a perpendicular cut. I usually just throw a iso curve on it, then measure the curved fillet. Just seems like there should be an easier way and I can’t find anything in the search.

Maybe this is helpful: show_min_radius.py (1.8 KB) It will show the minimum radius of a surface at its midpoint. So not suitable for double curved surfaces or variable radii fillets:

_Curvature is technically what you re after, but it will output “inverse radius” = curvature. 1/r = c combined with inline calculation it is acceptable for many workflows. not a 100% solution - kind regards -tom

Hi @Tom_P Is this any easier than creating an isocurve first and using radius? Don’t we still have to use radius after the curvature command and measure the created curvature curves or do the math you describe? Seems Rhino should report the radius at the curvature point too at the command line and …

[image] 3dsynergy: isocurve … and local curvature might not be the same - see this simple example (red/green = iso, blue = curvature) [image] [image] 3dsynergy: measure the created curvature curves or do the math you describe it depends a bit - the featback in the commandline might …

After looking at the solutions that people have given and put more thought into this, this would be a difficult thing to do. If you had a fillet running around the top of a box that has filleted edges, then how would clicking on a point on the corner fillet be determined? Is it supposed to give yo…

[image] Christopher: better solution Script solution: [image] Chordal fillets with minimum radius? Rhino for Windows Diego, actually I think do have a thing that may help… let me have a look around. @DiegoKrause - This can probably use some work but it …

Thanks, this is pretty much what I was looking for.

Hi @Gijs Awesome work! I like the way you did this with the text dots and display it’s great that it reads a whole polysurface including flat angled surfaces. Thanks for your expertise, RM

In RhinoWIP I added TestShowRadius which is an improved version of what you see above. It will again measure the smallest radius on the surface more or less in the middle of the surface. The script above doesn’t work well with trimmed surfaces. TestShowRadius will allow you to pick both surfaces, po…

Measure Radius of Surface or Solid Fillet

Rhino

spb (Steven Burzinski) February 14, 2026, 6:12pm 6

Script solution:

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Measure Radius of Surface or Solid Fillet

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