CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 02/19/2015 11:52 AM, Narusaki wrote:
> Sebastien Loriot (GeometryFactory) wrote
> > On 02/19/2015 11:18 AM, Narusaki wrote:
> > > Hi Sebastien,
> > >
> > > Thank you for the reply. I've found the bug for the extra ray -- it's
> > > because I thought the pleft/pright of the hyperbola mean the left/right
> > > branch, but it turns out it means the left/right part of the branch
> > > according to the axis.
> > >
> > > Now it only leaves me with the problem of the shape of the hyperbola. I
> > > gradually multiply each site (x, y, z) by 10^0, 10^1, ..., etc. and the
> > > hyperbola seems to be more and more smooth. I've checked the points
> > > generated by the function you've mentioned, and it's indeed about 100
> > > points
> > Where are these points then?
> >
> > Sebastien.
> >
> > > (with an extra one) for whether there is a multiplier for each site or
> > > not.
> > > For example, the following two pics are corresponding to multiply the
> > > sites
> > > by 10^0 and 10^1 separately:
> > >
> > > <http://cgal-discuss.949826.n4.nabble.com/file/n4660484/p1.png>
> > > <http://cgal-discuss.949826.n4.nabble.com/file/n4660484/p2.png>
> > >
> > > It seems that the first one is approximated by two line segment and the
> > > the
> > > second one is approximated by four. I've tried to use the kernel you
> > > mentioned but that doesn't help, and as I've mentioned above, the
> > > generated
> > > points number seems to be no problem.
> > >
> > > So what the problem could be now?
> >
> > Well just on the line segments in the former pics, I guess. Since I'm
> > rendering the hyperbola by each of its small line segments myself, I think
> > this shouldn't be the problem.

Could you add a cout in the point generation function to print the
point into a file and post it here? I just want to check.

Sebastien.

> > And as I'm reading the Hyperbola_2.h file, I found there're two versions
> > of generate_points() method, and in the one with the "_qt" suffix (which I
> > think it may serve for the rendering in the qt GUI framework), I saw the
> > STEP variable is set according to the size of the window, which is
> > obviously skipped in the raw generate_points() method. Could this be the
> > problem?
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