Fillet component creates a smaller radius than requested

Grasshopper
,
1

The “Fillet” component is creating a smaller radius than requested, even if the same fillet in Rhino works fine.
The same result is happening with the “Fillet Distance” component.

image
image1506×497 38.1 KB

2

This has been discussed already. On a 90° angle, the maximum fillet size is half of the shorter segment length

3

Hi Martin,
Thank you for your reply.
I think this is not related to the angle.
Here are other 2 examples wit an angle smaller and larger than 90 degrees.

BTW, any solution?

image
image1480×573 32.4 KB

image
image1450×511 28.8 KB

4

Arc end points are right at the segment mid point no?

image
image1302×767 24.4 KB

As a workaround, you could extend the curves

6

Yes i see that the arcs start in the middle point of the line.
My problem is a bit more complex because i have to deal with more complex polylines.
In the example below you can see a different logic for the middle vertices (also a comparison with the rhino command “FilletCorners”).
Definitely, there is room to complete the operation successfully but the behaviour in the grasshopper component is weird.

image
image1814×721 73.8 KB

7

Hi
You can try the FilletCorners component of the Bubalus_GH plugin.

1
11395×378 37.4 KB

FilletCorners.rar (1.8 MB)

8

Just for fun, something with Grasshopper components :slight_smile

image
image1434×697 107 KB

I played around some more and with some limitations this can be used with different radii:

image
image1350×740 100 KB

fillet_polyline_polyarc.gh (21.7 KB)

9

Hi Naruto,
It works perfectly, unfortunately, I can’t use external plug-ins for this script.
It would be nice to share the logic used behind this component.
Thanks anyway!

10

Hi Martin,
This is a very nice try. Most of the time the PolyArc works fine.
Only in a few cases, when the fillet shouldn’t fit it makes the circle in the opposite side.

image
image1693×558 41.5 KB

I need to work a bit more on it but thank you for your help.

The “FilletCorners” comand in rhino (also Bubalus_GH) makes a very nice solution for this cases, see image

image
image1692×594 48.9 KB

image
image1494×591 48.7 KB

11

try this:
CreateFillet.gh (2.3 KB)

1 Like
12

Thanks Naruto!
It works perfectly :+1:

13

I made another version where I can enter different radii for each kink. Or zero for no radius.

image
image1156×864 18.3 KB

fillet_polyline_polyarc.gh (37.2 KB)

2 Likes
14

I have created another feature which might be handy if you deal shapes where holding a minimal radius is required (Milling, legal/technical requirements etc…):

Assuming you have an outline and this outline is curved, the linked script will detect any radius too small and replace it with a fillet of exact radius.
The current limitation of this is, that it skips the radius replacement if it detects two occurrences too near to each other, but it will show the location at least…

1 Like
15

Thanks @martinsiegrist and @TomTom, Interesting solutions but a bit too complex to include in my script.
Thanks anyway! :+1:

1 Like