Christoph,

"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:c80akk$ovb$1@chho.imagico.de...
> >
> > About the computations, determining the neighboring triangles is needed
> > for subdivision. So it is a must anyways.
>
> That depends on the method used.  Most methods for doing on-the-fly
> subdivision (which is an interesting feature for a raytracer BTW) do not
> use the neighbouring triangles.

I wish you could give a link or reference on this. For all that I know, you
need to have neighboring faces to apply subdivision mask.  Only on the
regular parts, there is a closed Bezier representation. But to compute the
Bezier coeffcients, you will need one-ring neighbor of triangles.

Xiaobin
http://www.cise.ufl.edu/~xwu/Pov-Sub

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