# Rhino fillet bug?!

**URL:** <https://discourse.mcneel.com/t/rhino-fillet-bug/193839>\
**Category:** Rhino\
**Tags:** windows\
**Created:** [October 27, 2024, 10:50am UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839 "2024-10-27T10:50:44Z")\
**Posts on this page:** 12\
**Page:** 1

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**Author:** ![John\_Kunst](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/john_kunst/32/759212_2.png) [@John\_Kunst](https://discourse.mcneel.com/u/John_Kunst)\
**Post date:** [October 27, 2024, 10:50am UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/1 "2024-10-27T10:50:44Z")

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First image show the fillet srf command run 3 times. Second image shows the fillet edge comand on the same set of surfaces.

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/5/6/b/56bdd8b8a809aea00bc49d9990dd9cbe73b81ab9.png)  
 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/3/1/1/311750fe29134a7cc4fbabdc2291354f6909845c.png)

I believe Rhino should be able to build such a simple fillet and shouldn’t rely on manual surface modeling.

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**Author:** ![encephalon](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/encephalon/32/611970_2.png) [@encephalon](https://discourse.mcneel.com/u/encephalon)\
**Post date:** [October 27, 2024, 1:16pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/2 "2024-10-27T13:16:08Z")

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i guess people asking you for files in recent topics did not seemed to have taken any effect. again posting some images and being upset that rhino does not make all the magic you wish is unfortunately not going to help anybody here. yes fillets do fail, but it often depends on what you feed it with, often is it just also user error. the image you show does not look like you modelled it very clean but we might never find out looking at your images.

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**Author:** ![John\_Kunst](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/john_kunst/32/759212_2.png) [@John\_Kunst](https://discourse.mcneel.com/u/John_Kunst)\
**Post date:** [October 27, 2024, 1:54pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/3 "2024-10-27T13:54:10Z")

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How do you explain fillet srf working and not fillet edge then?!

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**Author:** ![encephalon](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/encephalon/32/611970_2.png) [@encephalon](https://discourse.mcneel.com/u/encephalon)\
**Post date:** [October 27, 2024, 2:21pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/4 "2024-10-27T14:21:55Z")

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i have no idea without seeing your file, and beating around the bush is not one of my hobbies.

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**Author:** ![davidcockey](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/davidcockey/32/732604_2.png) [@davidcockey](https://discourse.mcneel.com/u/davidcockey)\
**Post date:** [October 27, 2024, 3:36pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/5 "2024-10-27T15:36:01Z")

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> [@John\_Kunst](#):
>
> I believe Rhino should be able to build such a simple fillet and shouldn’t rely on manual surface modeling.

> [@John\_Kunst](#):
>
> How do you explain fillet srf working and not fillet edge then?!

@John_Kunst Upload a .3dm file with your input geometry, and someone may be able to answer your question.

With a file someone from McNeel may submit a report about situation. Without a file it may be ignored.

Is there a reason you almost never provide a file with geometry when reporting a problem?

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**Author:** ![martinsiegrist](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/martinsiegrist/32/498369_2.png) [@martinsiegrist](https://discourse.mcneel.com/u/martinsiegrist)\
**Post date:** [October 27, 2024, 4:01pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/6 "2024-10-27T16:01:10Z")

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How do you expect anyone to help you without a file?

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**Author:** ![Tom\_P](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/tom_p/32/766520_2.png) [@Tom\_P](https://discourse.mcneel.com/u/Tom_P)\
**Post date:** [October 27, 2024, 4:11pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/7 "2024-10-27T16:11:59Z")

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No 3dm file.  
No party

If it turns out to be a bug.  
Add it here

> [@Fillet fails examples 2023-03 - hammering collection](https://discourse.mcneel.com/t/fillet-fails-examples-2023-03-hammering-collection/155236):
>
> the intention of this topic is to collect examples, where fillets fails. Please post screenshots and .3dm files or links to other topics. the idea of this topic is NOT to discuss single cases - but provide a nice overview / COLLECTION of the fails… @Joshua_Kennedy asked for this -

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**Author:** ![John\_Kunst](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/john_kunst/32/759212_2.png) [@John\_Kunst](https://discourse.mcneel.com/u/John_Kunst)\
**Post date:** [October 27, 2024, 4:27pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/8 "2024-10-27T16:27:04Z")

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Here is a file, everyone!  
Note that while I understand some will say varying things about the model (like some unnecessary surface in there etc) you should consider that sometimes these are modeled after sketches not done by me. -and that of course, in the case of something this simple it shouldn’t matter, but I look forward to being proven wrong!

[bad-fillet - Copy.3dm](https://discourse.mcneel.com/uploads/short-url/sWDRzjtBAFEp0KJNsmOAOXlks61.3dm) (83.1 KB)

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<div class="post-metadata">

**Author:** ![Gijs](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/gijs/32/481553_2.png) [@Gijs](https://discourse.mcneel.com/u/Gijs)\
**Post date:** [October 27, 2024, 4:34pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/9 "2024-10-27T16:34:44Z")

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the smaller surface has a radius of curvature at the end that is quite small,  
I am assuming you are filleting with radius 1, which is too large for that surface

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/8/d/3/8d3569e5c60910af0d8a2e27926db9ba883765c0.png)  
When you make FilletSrf fillets, notice that it starts to fold onto itself:  
 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/c/6/0/c60d3749e996a145fafeed2c49c781637ccd3612.png)

Is this intended?

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/8/e/e/8eeeb328fe789d0c7396f40cf6599ec37565f22c.png)

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<div class="post-metadata">

**Author:** ![John\_Kunst](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/john_kunst/32/759212_2.png) [@John\_Kunst](https://discourse.mcneel.com/u/John_Kunst)\
**Post date:** [October 27, 2024, 5:03pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/10 "2024-10-27T17:03:48Z")

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I see now. To be perfectly honest I have seen different versions of this part in the model, and that small patch seems to be different degrees between them. I’ll give it a second look in the following week.  
In your first image is that a Rhino native command?

And to be fair I should say that **I have been proven wrong** , so thank you!

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<div class="post-metadata">

**Author:** ![Gijs](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/gijs/32/481553_2.png) [@Gijs](https://discourse.mcneel.com/u/Gijs)\
**Post date:** [October 27, 2024, 5:12pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/11 "2024-10-27T17:12:16Z")

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> [@John\_Kunst](#):
>
> In your first image is that a Rhino native command?

Yes, \_Radius (or \_Curvature) with marking on. The dimension I added manually. During the command you can read out the radius in the statusbar.

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<div class="post-metadata">

**Author:** ![John\_Kunst](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/john_kunst/32/759212_2.png) [@John\_Kunst](https://discourse.mcneel.com/u/John_Kunst)\
**Post date:** [October 27, 2024, 6:11pm UTC](https://discourse.mcneel.com/t/rhino-fillet-bug/193839/12 "2024-10-27T18:11:04Z")

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Ah, so just a radius analysis. I thought that maybe there was something that checked and marked it automatically. Thanks!