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Spring around torus

Script

a = 12 b = 1 c = 9 t = Slider(0, 2 pi, 0.01, 1, 160, false, true, false, false) f(x) = x + c * sin(x / a + t) - t * c fx(x) = (7+2 cos(f(x))) cos(x / a / b) fy(x) = (7+2 cos(f(x))) sin(x / a / b) fz(x) = 2 sin(f(x)) Cord = Curve(fx(k), fy(k), fz(k), k, 0, 2 pi * a *b) r2 = 0.7 Tor = Surface((7 + r2 cos(v)) cos(u), (7 + r2 cos(v)) sin(u), r2 sin(v), u, 0, 2pi, v, 0, 2pi)