Ah, sorry, I should have said. Its the fan of the ideal generated by:
{v^2-w-1, w^2-x-1, x^2-y-1, y^2-z-1, z^2-v-1}. Not very complicated,
but of course with 5 variables you can't compute most fans.
I'm going to give a talk in early November on visualizing geometric
objects with associated algebraic data, so I'll probably try to polish
things a bit more before then and then submit whatever general code I
have. One thing I'd like to do is add some nicer Tachyon and Jmol
rendering to the Polyhedron and PolyhedralFan classes.
M. Hampton
On Sep 17, 10:46 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
> On Wed, Sep 17, 2008 at 6:23 PM, David Joyner <[EMAIL PROTECTED]> wrote:
>
> > On Wed, Sep 17, 2008 at 8:57 PM, mhampton <[EMAIL PROTECTED]> wrote:
>
> >> I thought I'd mention that using ffmpeg and Sage/singular/gfan/tachyon
> >> I was able to finish the little pilot project I had in mind: taking a
> >> 5d Groebner fan, intersecting it with a hyperplane, rotating it in 4d,
> >> and animating the projection into three dimensions. I am still
> >> struggling with the options to ffmpeg; I eventually just used "-qmax
> >> 2" and nothing else but I am sure that is far from optimal (I did try
> >> Vincent's options and it didn't work on OS X, I think I am missing the
> >> codex). I think the results are enjoyable:
>
> >>http://www.d.umn.edu/~mhampton/gf5.mp4
>
> > Cool!
>
> Wow, that's amazing. What is the 5d Groebner fan the Gfan of?
>
> -- William
>
> William Stein
> Associate Professor of Mathematics
> University of Washingtonhttp://wstein.org
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