For all issues regarding the Forums use, please, refer to the Forum Rules.

Our Solutions

Need professional assistance?
Consider our:

Support Offerings

 

Need to speed up your development?
Have a look at our:

Samples & Tools

 

Need some functionality extending standard OCCT capabilities?
Check out our:

Adv. Components

Related pages

Issues with BRepOffsetAPI_MakePipeShell

jerome caucat's picture
Submitted by jerome caucat on 3 March, 2021 - 11:23
Forums: 
Usage issues

Hi,
I am trying to build a pipe with the attached spine and profiles but the result is wrong, the pipe does not represent the profiles' shapes, see attached screenshots from DRAW.
I am using version 7.5.

Here is the DRAW code I am using to test:

pload ALL
restore /tmp/spine_23.brep s
restore /tmp/profile_23_1.brep p1
restore /tmp/profile_23_2.brep p2
restore /tmp/profile_23_3.brep p3
restore /tmp/profile_23_4.brep p4
restore /tmp/profile_23_5.brep p5
restore /tmp/profile_23_6.brep p6
mksweep s
setsweep -DT
addsweep p1
addsweep p2
addsweep p3
addsweep p4
addsweep p5
addsweep p6
buildsweep r -C -S
vdisplay s p1 p2 p3 p4 p5 p6 r
vfit

Note that with a simpler profile the pipe appears to be built correctly:

pload ALL
restore /tmp/spine_23.brep s
polyline p  43.2 -21.98 19.05  143.2 -21.98 19.05
circle c 43.2 -21.98 19.05  1 0 0  1
mkedge e c
wire w e
mksweep s
setsweep -DT
addsweep w
buildsweep r -C -S
vdisplay s w r
vfit

Is there a problem with my profiles or spine? Or should I use different parameters or a different algorithm?

Note that I also encountered the following bugs with different (but similar) spine and profiles:
- https://tracker.dev.opencascade.org/view.php?id=29645
- https://tracker.dev.opencascade.org/view.php?id=31147

Attachments: 
Image icon Screenshot from 2021-03-03 11-03-45.png
Image icon Screenshot from 2021-03-03 11-04-28.png
Image icon Screenshot from 2021-03-03 11-04-54.png
Binary Data spine_23.brep
Binary Data profile_23_1.brep
Binary Data profile_23_2.brep
Binary Data profile_23_3.brep
Binary Data profile_23_4.brep
Binary Data profile_23_5.brep
Binary Data profile_23_6.brep
jerome caucat's picture

Submitted by jerome caucat on 4 March, 2021 - 10:27

Note that If I scale the profiles up enough then the pipe is correctly constructed, but then I don't know how to scale it down without deforming it, here is the code with the scaled profiles:

pload ALL
restore /tmp/spine_23.brep s
restore /tmp/profile_23_1.brep p1
restore /tmp/profile_23_2.brep p2
restore /tmp/profile_23_3.brep p3
restore /tmp/profile_23_4.brep p4
restore /tmp/profile_23_5.brep p5
restore /tmp/profile_23_6.brep p6
tscale p1 43.199999999766412 -21.978965632645185 18.981000198798643 20
tscale p2 78.468000000000004 -21.999600000000001 18.981000000000002 20
tscale p3 113.73609999999999 -22.000000000000000 18.981000000000002 20
tscale p4 149.00420000000000 -22.000000000000000 18.981000000000002 20
tscale p5 184.27099941938175 -21.874151494835036 18.981000447502570 20
tscale p6 218.85993250260202 -16.107716095601475 18.986368524375496 20
mksweep s
setsweep -DT
addsweep p1
addsweep p2
addsweep p3
addsweep p4
addsweep p5
addsweep p6
buildsweep r -C -S
vdisplay s p1 p2 p3 p4 p5 p6 r
vfit
Forum supervisor's picture

Submitted by Forum supervisor on 16 March, 2021 - 06:37

Hello Jerome,

As the forum moved to Development Portal, please post your questions there: https://dev.opencascade.org/forums/usage-issues

Thank you.

 

Contact us

Attention: DO NOT use this form for all kind of request for the removal of your personal data. Please follow this link for such cases.

FOLLOW OPEN CASCADE

Twitter      LinkedIn

Youtube

 

A Capgemini Group Company