[general]
name = Dini2;
comments = Dini surface. Ulisse Dini (1845-1918).;
a1_min = -4;
a1_max = 34;
a1_steps = 60;
a2_min = -1; 
a2_max = 1;
a2_steps = 60;

[param]
name = a;
title = Shape;
default = 0.3;
min = 0;
max = 1;


[formula]
aa = deg(clamp(0.001,0.999,a) * pi);
v = A2 * pi;
T1 = exp((A1 - cos(aa) * v) / sin(aa));
r = 2 * sin(aa) / (T1 + 1 / T1);
t = 0.5 * r * (T1 - 1 / T1);

X = t - A1;
Y = r * cos(deg(v));
Z = r * sin(deg(v));


[preset]
name = default;
a = 0.3;
a1_min = -4;
a1_max = 4;
a1_steps = 60;
a2_min = -1; 
a2_max = 1;
a2_steps = 60;