e_x = (-0.4, -0.4)
e_y = (1, 0)
e_z = (0, 1)
t = 0 (slider from 0 to 18.84955592153876, step 0.01)
P: 3.0 * cos(t) * e_x + 3.0 * sin(t) * e_y + 0.2 * t * e_z
Q: 3.0 * cos(t) * e_x + 3.0 * sin(t) * e_y
a = Segment(P, Q)
R: 0.2 * t * e_z
b = Vector((0.0, 0.0), (0.0, 5.0))
w = Vector((0.0, 0.0), (5.0, 0.0))
u = Segment(R, P)
v = Vector((0.0, 0.0), (-2.0, -2.0))