I changed the strategy that I don't assign manifold first. I merge two
triangulations. Then, I loop over cells to see if cell has a side on the
merged interior boundary. If so, I set manifold id to it.
const Point<2> center (0,0);
const SphericalManifold<2> boundary_description(center);
tria.set_manifold (0, boundary_description);
for (typename Triangulation<2>::active_cell_iterator
cell=tria.begin_active(); cell!=tria.end(); ++cell) {
for (int fn=0; fn<4; ++fn) {
auto ctr = cell->face(fn)->center();
auto x=ctr[0],y=ctr[1];
if (0.92<std::sqrt(x*x+y*y)<1.) {
cell->set_all_manifold_ids(0);
break;
}
}
}
tria.refine_global(2);
The result is super strange that the boundary is also exterior boundary is
also curved.
在 2018年3月28日星期三 UTC-7下午9:00:50，Weixiong Zheng写道：
>
> Hi,
>
> I just started to try manifold and tria merging functionalities. My
> question comes from the problem that I have to merge two curved
> triangulations. When refining, how do I make sure the merged boundaries are
> still curved?
>
> I currently set manifold before merging triangulation but it seems not to
> work as desired.
>
> See the attachment pls.
>
> Thanks for any advice in advance.
> Weixiong
>
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