[general]
name = Archimedes Spiral;
comments = Archimedes of Syracuse (287-212).;
a1_min = 0.5;
a1_max = 2;
a1_steps = 200;
a2_min = 0; 
a2_max = 360;
a2_steps = 20;

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

[param]
name = d;
title = Direction <0 / >0;
default = 1;
min = -1;
max = 1;


[formula]
dd = 1 - 2 * linstep(-0.000001,0,d);

X = (A1 + a * cos(A2)) * cos(deg(A1 * 2 * pi));
Y = -dd * a * sin(A2);
Z = dd * (A1 + a * cos(A2)) * sin(deg(A1 * 2 * pi));


[preset]
name = default;
a = 0.1;
d = 1;
a1_min = 0.5;
a1_max = 2;
a1_steps = 200;
a2_min = 0; 
a2_max = 360;
a2_steps = 20;