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0028119Community[OCCT] OCCT:Modeling Algorithmspublic2016-11-17 10:092018-08-03 11:30
ickby 
msv 
normalminor 
newopen 
WindowsWindows 7Windows 7
[OCCT] 7.0.0 
 
bugs modalg_7 bug28119_1, bug28119_2, bug28119_3
0028119: Blend fails on fused identical but shifted tori
When fusing two identical and shifted tori the blending of the intersection edges fails. If the second radius of the two tori have a small difference the blend works fine.

When using draw.exe fubl on the identical tori does give a result, but it does not have blended edges. If blended manually the blend operation does not give a result.

Detected with FreeCAD0.17 and occ7.0 and reproduced with occ7.1beta draw.exe
# works NOT with identical secondary radi
pload ALL
ptorus t1 100 10
ptorus t2 100 10
ttranslate t2 100 0 0
fubl res t1 t2 5
vinit
vdisplay res
vfit

# works with large difference in secondary radi
pload ALL
ptorus t1 100 10
ptorus t2 100 9.9
ttranslate t2 100 0 0
fubl res t1 t2 5
vinit
vdisplay res
vfit

# works NOT with small differece in secondary radi
pload ALL
ptorus t1 100 10
ptorus t2 100 9.99
ttranslate t2 100 0 0
fubl res t1 t2 5
vinit
vdisplay res
vfit
No tags attached.
related to 0029910assigned msv Open CASCADE Porting to Debian80-64 : Regressions in Modeling Algorithms 
Issue History
2016-11-17 10:09ickbyNew Issue
2016-11-17 10:09ickbyAssigned To => msv
2017-08-08 14:13ickbyNote Added: 0069201
2017-08-23 14:05mkvTest case number => bugs modalg_7 bug28119_1, bug28119_2, bug28119_3
2017-08-23 14:05mkvNote Added: 0069784
2018-08-03 11:30nbvRelationship addedrelated to 0029910

Notes
(0069201)
ickby   
2017-08-08 14:13   
Still fails on OCC 7.2beta. Update of draw command was needed:

pload ALL
ptorus t1 100 10
ptorus t2 100 10
ttranslate t2 100 0 0
bfuseblend res t1 t2 2
# Error: Cannot find the result of BLEND-operation. The result of BOP operation will be returned.
(0069784)
mkv   
2017-08-23 14:05   
Problem described in issue is reproduced on current state of OCCT.