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IDProjectCategoryView StatusLast Update
0027030CommunityOCCT:Modeling Algorithmspublic2023-08-01 15:08
Reporterupdega2 Assigned Tojgv 
Status assignedResolutionopen 
Product Version6.9.1 
Target VersionUnscheduled 
Summary0027030: Cannot make fillet using BRepFilletAPI_MakeFillet on two cylinders unioned together.

I have created two cylinders using my own bspline surface lofting operation. I make these cylinders into solids and then union them together using BRepAlgoAPI_Fuse. I want to create a fillet in between the two cylinders using BRepFilletAPI_MakeFillet, but no matter what radius I try, it doesn't work. This seems like something that shouldn't be too hard, but its not working. I have tried on both mac and linux.

I am attaching the saved .brep file for the two cylinders. Any help in figuring this out would be appreciated.
Steps To ReproduceTry to create fillet in between unioned cylinders on provided .brep file.
TagsNo tags attached.
Test case number

Attached Files

  • TwoCylinders.brep (874,780 bytes)



2015-12-22 17:10


TwoCylinders.brep (874,780 bytes)


2016-01-08 20:56

reporter   ~0049740

I didn't clarify, but I'm not sure this is completely a fillet issue. I can create cylindrical surfaces using BRepOffsetAPI_ThruSections, union them together, and then I can fillet the edges of this.

However, when I use my own code to create the same surfaces and union them together, this is when I have issues creating a fillet. The surfaces are pretty similar, but obviously have slightly different knots, poles, etc. They are the same degree, continuity, and look very similar. Is there a better way to represent surfaces that makes it easier for the fillet operation? Is there something I should use to process my surface, so that I know I can create a fillet on it?

Thanks for any help!


2016-01-22 19:06

reporter   ~0050078

Does anyone have any advice, or has anyone had the chance to look at this at all?


2016-02-01 18:37

reporter   ~0050319

Has anyone had success creating fillets on more complicated geometry?

Issue History

Date Modified Username Field Change
2015-12-22 17:10 updega2 New Issue
2015-12-22 17:10 updega2 Assigned To => msv
2015-12-22 17:10 updega2 File Added: TwoCylinders.brep
2015-12-22 19:44 msv Assigned To msv => jgv
2015-12-22 19:44 msv Status new => assigned
2015-12-22 19:44 msv Target Version => 7.1.0
2016-01-08 20:56 updega2 Note Added: 0049740
2016-01-22 19:06 updega2 Note Added: 0050078
2016-02-01 18:37 updega2 Note Added: 0050319
2016-10-28 15:33 msv Target Version 7.1.0 => 7.2.0
2017-07-21 11:34 msv Target Version 7.2.0 => 7.3.0
2017-12-05 17:09 msv Target Version 7.3.0 => 7.4.0
2019-08-12 16:44 msv Target Version 7.4.0 => 7.5.0
2020-09-14 22:55 msv Target Version 7.5.0 => 7.6.0
2021-08-29 18:52 msv Target Version 7.6.0 => 7.7.0
2022-10-24 10:42 szy Target Version 7.7.0 => 7.8.0
2023-08-01 15:08 dpasukhi Target Version 7.8.0 => Unscheduled