> On 17 Oct 2018, at 23:25, Wang Bin <[email protected]> wrote:
>
> Dear Dr. Geuzaine,
>
> Thanks for you rapid reply.
>
> Based on your suggestion, now I'm working on normal vector issue in a
> simplified problem.
>
> Now I found a potential bug in Gmsh. When I use build-in geometry engine, the
> normal vector are all in the same direction.
> But when I switch to OpenCASCADE engine (adding SetFactory("OpenCASCADE")),
> the normal vector shows different. All of other info in geo file is exactly
> the same.
>
> How do I resolve this issue?
It's a limitation of the current OpenCASCADE interface: signs in curve loops
are ignored - they just don't have any effect.
Curve Loop(cl4) = {-l8,l7,l9};
should thus be written
Curve Loop(cl4) = {l7,l9,l8};
if you want the orientation to be governed by l7.
> <image.png> <image.png>
>
> Please check attachment geo file to see the details.
>
> Thanks,
> Bin
>
> Christophe Geuzaine <[email protected]> 于2018年10月16日周二 下午4:39写道：
>
>
>> On 16 Oct 2018, at 17:03, Wang Bin <[email protected]> wrote:
>>
>> Dear Developers,
>>
>> Thanks for the nice mesh generator. Now I'm trying to use BooleanFragments
>> in OpenCASCADE engine to mesh some "compsolid" model (picture) with
>> conforming mesh on the common interface (see attachment geo file).
>>
>> <compsolid.PNG>
>> But the OpenCASCADE engine will add new Points, Lines or Surfaces during the
>> boolean operation. Thus, Gmsh keeps give me a error "Point/Line/Surface #
>> already exists".
>>
>> So, is there any method/tricks to avoid this issue? Such as reserve some tag
>> id for the New geometry objects. Why Gmsh not using "newreg" internally to
>> append new geometry?
>
> Your surfaces are not correctly oriented, which leads to the creation of new
> entities when you create "surface loops". The duplicates are reported when
> you force the creation of new points after these extra entities have been
> created.
>
> Christophe
>
>
>
>
>
>>
>> Thanks for your help!
>> --
>> Bin Wang
>> PhD Student
>> Craft & Hawkins Department of Petroleum Engineering
>> Louisiana State University
>> 2245 Patrick F Taylor Hall, Baton Rouge, LA 70803
>> <composolid_new.geo>_______________________________________________
>> gmsh mailing list
>> [email protected]
>> http://onelab.info/mailman/listinfo/gmsh
>
> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
>
>
>
> --
> Bin Wang
> PhD Student
> Craft & Hawkins Department of Petroleum Engineering
> Louisiana State University
> 2245 Patrick F Taylor Hall, Baton Rouge, LA 70803
> <ori.png><face6_buildin.geo><face6_OpenCASCADE.geo><ori.png>
—
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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