# Fillet and intersect - bugs are food for hungry developers

**URL:** <https://discourse.mcneel.com/t/fillet-and-intersect-bugs-are-food-for-hungry-developers/200828>\
**Category:** Rhino\
**Tags:** mac\
**Created:** [March 5, 2025, 11:31pm UTC](https://discourse.mcneel.com/t/fillet-and-intersect-bugs-are-food-for-hungry-developers/200828 "2025-03-05T23:31:52Z")\
**Posts on this page:** 1\
**Page:** 1

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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:** [March 5, 2025, 11:31pm UTC](https://discourse.mcneel.com/t/fillet-and-intersect-bugs-are-food-for-hungry-developers/200828/1 "2025-03-05T23:31:52Z")

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Dear @sfp and @menno

this is food for you both ;-D  
At least Sam seams to be hungry.

> [@Boolean with pipes](https://discourse.mcneel.com/t/boolean-with-pipes/200748/24):
>
> feed me more problematic cases

# kissing tori

filletSrf does not find this green surface which is a fillet from a torus to a plane.  
my guess it has to do with some intersection / pull issue as at the end the surface that is not found should share an edge with the first tori.  
(only somehow similar to [this topic](https://discourse.mcneel.com/t/boolean-with-pipes/200748) - all examples are about tori that do intersect - or fail to…)

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/e/f/e/efef5dc5811d973090db17e16c123492f7e655ec.jpeg)  
instead we get his mess  
 ![Screenshot 2025-03-05 at 23.39.50](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/e/8/1/e81ded17588294b82021a17a4e9d9e03bac801b0.png)  
trying filletSrf on a part of the surface  
 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/4/8/c/48c313f0784891d317b974757f19acc590ed0445.jpeg)

hier comes the nutrients:  
changing U-V-N at least part of the surface is found !

 ![Screenshot 2025-03-05 at 23.54.40](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/6/9/2/69298652b84fb78dfddd611e8eeb5fe3c1a577b4.png)

for the kissing tori, after changing UV:  
filletSrf preview looks promissing

 ![Screenshot 2025-03-05 at 23.58.33](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/2/7/8/27822c5a789994f53f4b30ee100ab65b86be6d30.png)  
final result fails  
 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/6/4/9/649af0e779c8ae4731fbb17f52bb97d72e87dc5b.jpeg)

starting digging i also had some strange pull results with the center curve / circle of the searched torus pulled towards the thinner torus.  
this pull result also changed with changing UVN…  
but could not repeat.

this geometry is taken from this fillet challenge:

> [@Fillet Exercise / Challenge - Feedback and Practice](https://discourse.mcneel.com/t/fillet-exercise-challenge-feedback-and-practice/142641):
>
> Dear everybody, dear commutity, dear mc neel This is a test / exam I asked my students (4th (overall) Semester (2nd Semester with Rhino), Product-Design) to check, whether they see the underlaying geometry and, if they can model this object in Rhino V7 Mac and PC. I gave them 120 minutes to model it. I just designed this handle only for the purpose of this test: pdf [handle\_2022.pdf](https://discourse.mcneel.com/uploads/short-url/s8mprlXAWv5oQkbRwnknjxWdnNm.pdf) (705.3 KB) I did not find a pure solid, boolean\*\*, \_FilletEdge Solution. My approach uses su…

where my students should learn to see a revolve is a better approach then a fillet.

[kissingToris\_filletBug.3dm](https://discourse.mcneel.com/uploads/short-url/qxiazo91AIiOgMVAGjpwVfU1G2P.3dm) (5.2 MB)

hier is more intersection / pull stuff:

> [@Pull to unpredicted results, non-unique points](https://discourse.mcneel.com/t/pull-to-unpredicted-results-non-unique-points/131694/1):
>
> ![Cone_pull](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/f/d/c/fdc724b7933577a69737cda63df7f74682132daa.png)
> 
> Cone\_pull1025×938 52 KB

kind regards -tom