0029085: Modeling - fillet fails on synthetic case (sphere cut by cylinder)

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Date Submitted

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0029085

Community

[OCCT] OCCT:Modeling Algorithms

public

2017-09-06 16:26

2020-09-14 22:55

Reporter

abv

Assigned To

msv

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

Target Version

[OCCT] 7.6.0*

Fixed in Version

Summary

0029085: Modeling - fillet fails on synthetic case (sphere cut by cylinder)

Description

The 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 Reproduce

pload 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

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Attached Files

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)
2019-08-12 16:43	msv	Target Version	7.4.0 => 7.5.0
2020-09-14 22:55	msv	Target Version	7.5.0 => 7.6.0*