v = 1.4292036732051034 (slider from -1.5707963267948966 to 1.57079633, step 0.05)
r = 4.2 (slider from 0 to 5, step 0.1)
k = CurveCartesian(((r * cos(v)) * cos(u)), ((r * cos(v)) * sin(u)), (r * sin(v)), u, 0, 6.28319)
r_1 = 4.2 (slider from 0 to 5, step 0.1)