I think my mistake is I only set one wires TODO_Shape and one shell 
TODO_Shape to the projector...

So for a imported geometry one has to manually set these properties to 
corresponding faces and lines? What's the suggested CAD software to view 
IGES's TODO_Shape? In my case, reading the sphere shell into deal.II gives 
9 shell, but from GMSH or COMSOL I cannot view those 9 shells.

Secondlly, which mesh format keeps boundary information & solid information 
when imported to deal.ii? I read the .msh file from GMSH but boundary tags 
are discarded by deal.ii. It's ideal if internal boundary tags are kept.

Best,
Wayne

在2022年10月17日星期一 UTC+8 12:37:47<yy.wayne> 写道:

> Thanks it seems manifold ids are set correctly now.
>
> But I still get "point is not on manifold" error now even with big 
> tolerance.I think my coarse mesh conform to the geometry similar to the 
> bow_surface in step-54. The IGES geometry is generate by COMSOL, and mesh 
> file transformed from COMSOL to msh by gmsh. 
>
> Best,
> Wayne
> 在2022年10月17日星期一 UTC+8 12:16:49<Wolfgang Bangerth> 写道:
>
>> On 10/16/22 19:21, 'yy.wayne' via deal.II User Group wrote: 
>> > 
>> > But I don't find a iterator for edge in CellAccessor. There are cell, 
>> face, 
>> > and vertex iterators, but lArclengthProjectionLineManifold requires a 
>> 1d 
>> > topology. Which part of  mesh should I set manifold? 
>>
>> cell->line(l) or cell->face(f)->line(l) gives you what you want. 
>>
>> Best 
>> W. 
>>
>> -- 
>> ------------------------------------------------------------------------ 
>> Wolfgang Bangerth email: [email protected] 
>> www: http://www.math.colostate.edu/~bangerth/ 
>>
>>

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