"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Bald Eagle" <cre### [at] netscapenet> wrote:
>
> > I'm confident that this is a solvable problem.
>
>
> As I said.   Success!   :)
>
> Looks like all you have to do is change these two lines:
>
> I got the atan to give me a "clean" curve, but it was really skinny.   "maybe
> that's just rotated 90 deg from what it should be...?
> So I got rid of the pi/2.  No idea _why_ that works...   yet.
>
>
> #declare PHI = function (u) {-atan2( FdY(u), FdX(u) ) + pi/2*0};
>
> #declare F1 = function(u,v) {QY(v)*sin(PHI(u)) + FX(u)};

Heureka and congratulations! You solved that 'pain in the backside'.

I adapted the POV-script according to the functions above and it looks great!
Changing QX to QY in F1 did the trick. And right, the pi/2 produces a
very, very flat curve almost like a ribbon.

I will try to do some fine tuning as the heart curve still has an inconsistency
where the dip is.

But all in all it's a beauty and I'm definitely happy.

I wish you a Merry Christmas and thank you so much.

Oswald

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