CGAL users discussion list

[Fabio Casado Ruiz <>]

On 6/8/2011 1:20 AM, Andreas Fabri wrote:
> On 06/06/2011 04:17, Fabio Casado Ruiz wrote:
> > Hi everyone, I'm trying to make some comparisons between meshes
> > generated using both TetGen as CGAL. Tetgen statistics for generated
> > meshes are pretty detailed, but for CGAL (and I must admit that
> > because of time issued I'm only using the Mesh_3 demo) there are a
> > few statistics I dont comprehend fully. Is there a place where the
> > demo, its way of functioning and statistics are explained? I'm
> > interested in facet angles (this are the angles of superficial faces
> > right?), the dihedral angle (these are showned in the diagram at the
> > bottom of the window right?) and the tet. max size (does this size
> > refer to tetrahedral volumes?).
> >
> > Another issue is the aspect (visually) of final meshes. I've
> > generated a couple, and when I look at them I can see places where
> > the original borders are not included (see example pictures). Is this
> > because CGAL doesnt conform to boundaries????
>
> Hi Fabio,
>
> Did you run the demo that comes with CGAL to produce this mesh?
> There the sharp edges should appear nicely, as the demo first
> detects sharp features and then passes the polyline describing
> them to the mesh generation function.
>
> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Mesh_3/Chapter_main.html#Subsection_49.3.5 
>
>
> andreas
>
> > Please I would appretiate your help a lot . Thanks again, Fabio.
yes, im using the CGAL demo. de model is actually really simple, im 
attaching it. i mesh with the same parameters the demo suggests. im 
using cgal3.8 (beta1). i include again the image file showing how the 
final mesh doesnt conform to the boundary lines. can u help? i wanted to 
show two meshes, one done in tetgen and one done in cgal, and i always 
expected cgal's to be better (even do it would be generated in a little 
extra time).
thanks
fabio.
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3 458 457 456
3 461 460 459
3 464 463 462
3 467 466 465
3 470 469 468
3 473 472 471
3 476 475 474
3 479 478 477

Attachment: Part1CGAL.PNG
Description: PNG image