CGAL users discussion list

[Peter Hachenberger <>]

Hi Gilbert,

half an hour is more than I would expect from a model of that size. I
have an example file that has about 2/3 of the size of your model and
the execution of  handling_double_coordinates takes less than half a
minute. So, I'm a bit surprised. Can you please send me the file so that
I can test it. 

Peter 

On Mon, 2008-01-07 at 03:47 -0600, Gilbert Bernstein wrote:
> 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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