"Christian Froeschlin" <chr### [at] chrfrde> schreef in bericht 
news:4942ef4b$1@news.povray.org...
>
> What exactly is it you wish to achieve within POV-Ray?
>
> As far as I can see, if you use an external heightfield,
> its either seamless or not, and if you have some kind of
> function for the terrain you don't really need tiles as
> you already get arbitrary extent and resolution?
>
> But it's an interesting construct, I never thought of
> projective planes in terms of landscape tiling - I was
> actually thrown off track for a bit by the unusual array
> directions but I'd still say its a projective plane ;)
>
> http://en.wikipedia.org/wiki/Fundamental_polygon


You are perfectly right on all points. In fact, I didn't think this through 
obviously as indeed, in POV-Ray, you can use a function and not use tiles at 
all. So consider my question as gone down the drain.

Thanks for that page on projective planes. My math knowledge is not up to 
understanding this, but I have an idea now how GeoControl uses this.

Thomas

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