"Christoph Hormann" <chr### [at] gmxde> schreef in bericht
news:cd3bdj$66i$1@chho.imagico.de...
> Well, of course you can do this but when you rotate the function around
> the x or z axis and then evaluate the function in the x-z-plane you will
> just rotate the evaluation plane.  But P is still constant in vertical
> direction.  To get a visible effect from a rotation you will need to
> evaluate the function in 3D: function {y - P(x,y,z)} (but you probably
> will need to adapt the function itself to make it look right).
>
That makes sense, indeed! <sigh> I think I should dig up those old musty
books, burrowed somewhere in the basement ;-)
Thanks a lot Christoph! You have put me (again) on the right track!

Thomas

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