step_var1 = r
step_size1 = 0.25
lower_limit1 = 0.25
upper_limit1 = 4
step_var2 = t
step_size2 = 45
lower_limit2 = 0
upper_limit2 = 360
geometry = nurbs_surf
angles = degrees
origin = 0, 0, 0
x = r * cos(t)
y = r * sin(t)
z = -1.0 / r