TopoShape display in v7.4.0 is wrong? - Forum Open Cascade Technology

xu weibin
Mon, 12/23/2019 - 12:09

Forums:

Data Exchange and Application Framework

Hi,

I import an iges,and save it with occt!It is right in v7.3.0. I upgrate occ to v7.4.0. It is wrong. I want to know why?

Is it a bug in 7.4? How can I do to solve this problem? The image is bleow!

Attachments:

occ7.3_7.4.png

Kulikova Galina
Mon, 12/23/2019 - 12:52

Could you please attach initial IGES file In order we can analyze this case and give you answer on the your question.

Best regards

xu weibin
Tue, 12/24/2019 - 04:27

v7.3 and v7.4 import igs is right!I use v7.3 to save shape to brep, and open in v7.4 is wrong! Files below!

Attachments:

test_0.igs

7.3.brep

7.4.brep

xu weibin
Sat, 12/28/2019 - 03:42

Is it occ7.4 bug?

Kirill Gavrilov
Sat, 12/28/2019 - 12:30

It is unclear from description how 7.4.brep file has been produced from test.igs.
I'm unable producing such BREPs by reading IGES file using OCCT 7.3 and OCCT 7.4.

pload MODELING XDE VISUALIZATION
testreadiges test_0.igs i
checkshape i i
tclean i

restore 7.3.brep b1
checkshape b1 b1
#fixshape b1 b1
tclean b1

restore 7.4.brep b2
checkshape b2 b2
#fixshape b2 b2
tclean b2

vclear
vinit View1
vdisplay -dispMode 1 i b1 b2
vsetlocation b1 10 0 0
vsetlocation b2 20 0 0
vfit

Reading IGES anew produces a valid shape, while both attached BREP files have an issue
(after fixshape both shapes look fine in 3D Viewer):

 -- The Shape b1 has problems :
  Check                                    Count
 ------------------------------------------------
  No 3D Curve .............................. 4
  Unorientable Shape ....................... 1
 ------------------------------------------------

There couldn't be a guarantee for BRepMesh producing a good mesh for invalid shape,
so I would first try to determine why your shape files have problems.

Fill free reporting the issue on Bugtracker:
https://dev.opencascade.org/index.php?q=home/get_involved