Fillet tangential to surface and touching a curve


could someone advise me how to create a fillet (with defined radius) that would be tangential to a surface and touching a curve?

I have tried to do offset of the surface and pipe of curve and form their intersection do second pipe. Second pipe should be tangential to surface and touching a curve. But intersection of surface and second pipe is discrete or it is created by small ellipses.

The result should look like in the picture.

Thanks in advance,

fillet.3dm (593.6 KB)

the file has not been uploaded correctly pls upload it again.

OK, here is itfillet.3dm (593.6 KB)

Hello R Dolecek

Please see attach, if it is what you want to have, I will give you some direction how I done it.

fillet 1.3dm (614.7 KB)

Many thanks

Hi Dan - there is a test command that does exactly this - testFilletSrfCrv - explode and untrim the surface, delete or hide the existing fillet surface, then run this command - you’ll need to type the whole thing, it will not auto-complete. I used radius 3:



Thanks Pascal, it works exactly I wanted :slight_smile:

Hi Dan,

although the fillet does not have a invariant radius, could you give me idea how you did it?


Hello Roman

Please see attach, there is also description how I done it.

fillet 1.3dm (747.1 KB)

Have a nice day

Many thanks