[general]
name = SnailShells;
comments = Different Snail shapes;
a1_min = 0;
a1_max = 2;
a1_steps = 200;
a2_min = 0; 
a2_max = 360;
a2_steps = 40;


[param]
name = a;
title = a;
default = 1;
min = 0.1;
max = 10;

[param]
name = b;
title = b;
default = 1;
min = 0.1;
max = 10;

[param]
name = c;
title = c;
default = 1;
min = 0.1;
max = 10;

[param]
name = h;
title = h;
default = 1;
min = 0.1;
max = 10;

[param]
name = k;
title = k;
default = 1;
min = 0.1;
max = 10;

[param]
name = r;
title = r;
default = 1;
min = 0.1;
max = 10;

[formula]
X = 3 * exp(r * A1) * (h + a * cos(A2)) * cos(c * deg(A1));
Y = 3 * exp(r * A1) * (k + b * sin(A2));
Z = -3 * exp(r * A1) * (h + a * cos(A2)) * sin(c * deg(A1));

[preset]
name = Pseudoheliceras;
a = 1.6;
b = 1.6;
c = 1;
h = 1.5;
k = -7;
r = 0.075;
a1_min = -50;
a1_max = -1;

[preset]
name = Astroceras;
a = 1.25;
b = 1.25;
c = 1;
h = 3.5;
k = 0;
r = 0.12;
a1_min = -40;
a1_max = -1;

[preset]
name = Bellerophina;
a = 0.85;
b = 1.2;
c = 1;
h = 0.75;
k = 0;
r = 0.06;
a1_min = -10;
a1_max = -1;

[preset]
name = Euhoplites;
a = 0.6;
b = 0.4;
c = 1;
h = 0.9;
k = 0;
r = 0.1626;
a1_min = -40;
a1_max = -1;

[preset]
name = Nautilus;
a = 1;
b = 0.6;
c = 1;
h = 1;
k = 0;
r = 0.18;
a1_min = -10;
a1_max = 1;

[preset]
name = Natica stellata;
a = 2.6;
b = 2.4;
c = 1;
h = 1.25;
k = -2.8;
r = 0.18;
a1_min = -20;
a1_max = 1;

[preset]
name = Turitella;
a = 0.7;
b = 0.7;
c = 1.2;
h = 0.1;
k = -4.5;
r = 0.04;
a1_min = -50;
a1_max = -1;


[preset]
name = Mya arenaria;
a = 0.85;
b = 1.6;
c = 3;
h = 0.9;
k = 0;
r = 2.5;
a1_min = -1;
a1_max = 0.52;