Dualita3D

A = Point(xAxis)
B: (-1, 0, 1)
a = -0.9 (slider from -5 to 5)
p: x + (a * y / 2) + 1 = 0
C: (1, a / 2, 0)
D: (1, 0, 0)
E: (1, 1, 0)
g = Line(D, E)
h = Line(D, E)
f = Line(A, B)
i = Line(A, B)