[general]
name = Helicoid;
comments = Helicoid surface;
a1_min = -2;
a1_max = 2;
a1_steps = 40;
a2_min = 0; 
a2_max = 4;
a2_steps = 80;

[param]
name = r;
title = Radius;
default = 1;
min = 0.1;
max = 5;

[param]
name = a;
title = Center Offset;
default = 0;
min = 0;
max = 5;

[param]
name = b;
title = Angle;
default = 0;
min = 1;
max = 1;

[param]
name = h;
title = Spacing;
default = 3;
min = 0;
max = 3;


[formula]
v = deg(A2 * pi); 

X = r * a * sin(v) - r * A1 * cos(v);
Y = tan(-4.5 * h * b) * A1 + h / pi * A2;
Z = r * a * cos(v) + r * A1 * sin(v);

[preset]
name = Full;
r = 1;
a = 0;
b = 0;
h = 3;
a1_min = -2;
a1_max = 2;
a1_steps = 40;
a2_min = 0;
a2_max = 4;
a2_steps = 120;

[preset]
name = Half;
r = 1;
a = 0;
b = 0;
h = 1.5;
a1_min = 0;
a1_max = 2;
a1_steps = 30;
a2_min = 0;
a2_max = 8;
a2_steps = 200;

[preset]
name = Open;
r = 1;
a = 1;
b = 0;
h = 3;
a1_min = -2;
a1_max = 2;
a1_steps = 30;
a2_min = 0;
a2_max = 4;
a2_steps = 200;

[preset]
name = Screw1;
r = 0.8;
a = 0;
b = 1;
h = 2;
a1_min = -2;
a1_max = 2;
a1_steps = 30;
a2_min = 0;
a2_max = 8;
a2_steps = 200;

[preset]
name = Screw2;
r = 0.5;
a = 1.5;
b = 2.5;
h = 2;
a1_min = -2;
a1_max = 2;
a1_steps = 30;
a2_min = 0;
a2_max = 8;
a2_steps = 200;