Concave fillet or reverse fillet

Rhino
1

Hi

is there a way or command to fillet a curve or surface like this,
parts at the right is what I want

image
image1600×497 3 KB

Now I do it with a macro but a simple command like fillet would be great.

thanks

2

I don’t think there is a command for that. A simple solution to your problem is select the edges and run the pipe command and then boolean subtract the pipe from your object.

3

Do a ‘normal’ fillet, and then mirror the fillet curve using the ends as axis?

4

Prolly quickest in plain Rhino to make a bunch of circles on the corners to be filleted and then CurveBoolean.

image

Also, for solids, testInverseFilletEdge…

-Pascal