[general]
name = Henneberg;
comments = Henneberg's minimal surface. Ernst Lebrecht Henneberg (1850-1933).;
a1_min = -1;
a1_max = 1;
a1_steps = 40;
a2_min = -90; 
a2_max = 90;
a2_steps = 100;

[formula]
S1 = rad(sinh(A1));
S2 = rad(sinh(3 * A1));
C1 = rad(cosh(2 * A1));

X = 0.2 * (2 * S1 * cos(A2) - 0.666666666 * S2 * cos(3 * A2));
Y = 0.2 * (2 * C1 * cos(2 * A2));
Z = 0.2 * (2 * S1 * sin(A2) + 0.666666666 * S2 * sin(3 * A2));