CGAL users discussion list

[Gilbert Bernstein <>]

Peter,

Here is the robocat (3756 vert 7512 tri) model, which I was able to  
get through in half an hour.  I was running another job along with  
it, so it may not take that long, though it should take a good while.

Attachment: robocat_deci.off
Description: Binary data

I also tried a simplified shark model (1007 vert 2010 tri) which I  
just measured at appx. 2 min to convert on my 1.83 Ghz Core Duo (not  
Core2) (using only one core I believe)

Attachment: shark_simple.off
Description: Binary data

-- Gilbert

On Jan 7, 2008, at 6:11 AM, Peter Hachenberger wrote:

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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