"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)};

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