CGAL users discussion list

[Marek <>]

Hi
I'm trying to mesh this door-like model with CGAL 3d mesher:
door.off <http://cgal-discuss.949826.n4.nabble.com/file/n4657448/door.off>  
<http://cgal-discuss.949826.n4.nabble.com/file/n4657448/door_shell.png> 

I'm using this domain:

typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Mesh_polyhedron_3<K>::type Polyhedron;
typedef CGAL::Polyhedral_mesh_domain_with_features_3<K> Mesh_domain;

then I load my door polyhedron into domain and use:
  domain.detect_features(40.0);
to detect sharp edges.

I'm also using:
  facet_topology = CGAL::FACET_VERTICES_ON_SAME_SURFACE_PATCH
to make sure I wont get distortions in thin wall areas.
For proper detected edges insertion I use nonzero edge_size criterion.

Meshing example:
 edges_size = 10
 facet_angle = 20
 Other are default.

Result:
<http://cgal-discuss.949826.n4.nabble.com/file/n4657448/door1_2.png> 
We can see that in thin wall area mesh is pretty dense, which makes 130k+
tets in whole model. That is definitely to much for me and I need to reduce
this value.
I tired to change it manipulating criteria values but I can't see any
changes in dense areas:
edges_size = 10
facet_angle = 5
<http://cgal-discuss.949826.n4.nabble.com/file/n4657448/door1_1.png> 

So now I don't have any criterion on cell shape, and for facet angle I
lowered from 20 to 5 degrees but it makes no changed at all. Why is that?

I've also tried to tweak edge_size, but it helped nothing:
<http://cgal-discuss.949826.n4.nabble.com/file/n4657448/door2_1.png> 
I know that it's only max value but still this is unnecessarily dense. How
can I change it?

How can I reduce mesh density/quality to get model that I can further work
with?
I would like to reduce vertices amount from tens of thousands to at most
several thousands.

Please, help.

Regards, Mark.






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