FilletEdge Oddity

Rhino Rhino for Mac
1

I’ve been creating an odd shape during which I encountered a number of Rhino behaviors that I found odd. Here is one involving FilletEdge.

  • At the far left I have the starting point.
  • Next I do a fillet edge, rolling ball 3.55" which does not work. I cold get one of the other two fillets to work but I needed the 3.55" radius for other things to work.
  • Joined the resulting surfaces together.
  • Finally I did booleansplit and I get the desired result.

It seemed to me that the FilletEdge command should have been able to handle this fillet considering how straightforward the workaround is.

Screen Shot 2021-09-07 at 5.00.12 PM
Screen Shot 2021-09-07 at 5.00.12 PM1642×947 29.3 KB

Problem Fillet.3dm 2.zip (522.1 KB)

2

Hello - FilletEdge fails to trim here because the radius is larger than the surfaces can accomodate -

image
image996×723 21.7 KB

-Pascal

1 Like
3

What it appears you are saying is FilletEdge cannot take into account adjoining surfaces.

In this particular case, extending the fillet into the adjoining surface produces the desired result.

4

Right- FilletEdge does not know about faces that are not attached to the edges being filleted - probably its prmary weakness…

-Pascal

5

Sounds like a wishlist item.

6

Oh yes…

-Pascal

7

The two failings Rhino has vis-a-vis my former ACIS modeler are fillets and shelling (fortunately, that is the full extent of my list).

I find that in order to shell I frequently need to:

  1. Remove the desired face (ExtractSRF)
  2. OffsetSrf the shell amount.
  3. Extend the edges beyond the opening.
  4. Trim to make the opening planar.
  5. Cap to create a SOLID
  6. Subtract this from the original to shell.