[general]
name = Fresnel Elasticity;
comments = Fresnel's elasticity surface. Auguste Jean Fresnel (1788-1827).;
a1_min = 0;
a1_max = 360;
a1_steps = 40;
a2_min = -90; 
a2_max = 90;
a2_steps = 100;

[param]
name = c;
title = Tension;
default = 2;
min = 1;
max = 10;


[formula]
S1 = sin(A1);
C1 = cos(A1);
S2 = sin(A2);
C2 = cos(A2);
cc = max(0.1,c);
T1 = sqr(S2) + sqr(cc) * sqr(C2) * (sqr(C1) + sqr(S1));

X = cc * S2 / T1;
Y = sqr(cc) * S1 * C2 / T1;
Z = -sqr(cc) * C1 * C2 / T1;


[preset]
name = default;
c = 2;
a1_min = 0;
a1_max = 360;
a1_steps = 40;
a2_min = -90; 
a2_max = 90;
a2_steps = 100;