CGAL users discussion list

[Gilbert Bernstein <>]

It seems I have to apologize for making such a stink here.  It was  
probably a false alarm.

I think I had unreasonable expectations on the speed of the  
computation and thought the program had gone into a loop.  I managed  
to push a smaller model (3756 vertices 7512 triangles) through the  
conversion both ways just now by waiting about half an hour.  I also  
know the model in question has some very funky joins between parts  
(lots of long, close, sharp polygons) so I'm pretty sure this was  
just a matter of patience.  If only I was testing with the teapot.   
Then I could make a really awful joke about watched teapots.

I just ran another model (1007 vert 2010 tri) through just fine, much  
faster, so yeah...

-- Gilbert

On Jan 7, 2008, at 3:12 AM, Andreas Fabri wrote:


Gilbert,

It might be the best to just post a file that makes problems.
What is your OS/compiler, did you just take the example or
demo program, or write your own program? In the latter case
what kernel did you chooses?

andreas


Gilbert Bernstein wrote:
> Andreas,
>     I'm fairly sure all of the meshes I've tried are triangular  
> meshes, (I went back and checked a couple of them (since they're in  
> ascii) by eye) so I don't think that's the problem.
> -- Gilbert
> On Jan 7, 2008, at 2:10 AM, Andreas Fabri wrote:
> Hello,
> A typical problem is to have faces which are not triangular,
> and at the same time not coplanar.
> andreas
> Gilbert Bernstein wrote:
> > Hi,
> >     I'm having an awful lot of trouble successfully building Nef  
> > Polyhedra from .off input files.  The only model I have  
> > successfully translated from .off to a Nef Polyhedron and back is  
> > a cube.  I have tried a number of different models, all supposed  
> > to be watertight, and which were certified by the  
> > Polyhedron_3::is_closed() function.  It certainly may be the case  
> > that there was something off (ba dum chh) about these models, but  
> > I've reached my point of frustration.  If anyone has any known  
> > working examples of importing models into the Nef Polyhedron type,  
> > or any suggestions, I would much appreciate the tips.
> > -- Gilbert Bernstein
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