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IDProjectCategoryView StatusDate SubmittedLast Update
0029085Community[OCCT] OCCT:Modeling Algorithmspublic2017-09-06 16:262017-09-06 17:44
Reporterabv 
Assigned Tomsv 
PrioritynormalSeverityminor 
StatusnewResolutionopen 
PlatformOSOS Version
Product Version 
Target Version[OCCT] 7.4.0*Fixed in Version 
Summary0029085: Modeling - fillet fails on synthetic case (sphere cut by cylinder)
DescriptionThe problem (originated from FreeCAD) has been reported on user's forum at: https://www.opencascade.com/content/problem-fillet [^]

Fillet fails on the shape produced by cutting a sphere with radius 25 by cylinder with radius 15, except for fillets with very small radius (R <= 0.9 on the test script below).

Fillet can be built on a half of the object, but it does not look like circular fillet, see attached image.
Steps To Reproducepload MODELING

psphere s 25
pcylinder c 15 100
trotate c 0 0 0 1 0 0 90
trotate c 0 0 0 0 1 0 180
ttranslate c -11 50 0
bcut b s c
donly b

explode b e

# problem 1: fillet fails on whole shape (works only with radius <= 0.9)
del res_fail
fillet res_fail b 8. b_4
checkshape res_fail

# problem 2: fillet built on half shape is apparently not circular
box bo -40 0 -40 100 100 100
bcut bhalf b bo
explode bhalf e
fillet res_half bhalf 8. bhalf_4
Additional information
and documentation updates
P.S. Both commands "blend" and "fillet" provide no message on error, this is ridiculous!

Note that in OCCT 6.0 these commands did report error:

EXCEPTION Stripe compute 00742648 : Standard_Failure: rattrapage en retouchant les points non ecrit : pas de voisin
TagsNo tags attached.
Test case number
Attached Filespng file icon bug29085.png (38,833 bytes) 2017-09-06 17:09

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- Issue History
Date Modified Username Field Change
2017-09-06 16:26 abv New Issue
2017-09-06 16:26 abv Assigned To => msv
2017-09-06 16:34 abv Summary Modeling - fillet fails => Modeling - fillet fails on synthetic case (sphere and cylinder)
2017-09-06 16:34 abv Description Updated View Revisions
2017-09-06 16:34 abv Additional Information Updated View Revisions
2017-09-06 17:07 abv Description Updated View Revisions
2017-09-06 17:07 abv Steps to Reproduce Updated View Revisions
2017-09-06 17:07 abv Additional Information Updated View Revisions
2017-09-06 17:09 abv File Added: bug29085.png
2017-09-06 17:26 abv Summary Modeling - fillet fails on synthetic case (sphere and cylinder) => Modeling - fillet fails on synthetic case (sphere cut by cylinder)


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