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- r = 2; \[Theta] = Pi;
- Manipulate[
- GraphicsGrid[{Table[ParametricPlot3D[{
- (r + Cos[u/2] Sin[v] - Sin[u/2] Sin[2 v]) Cos[u],
- (r + Cos[u/2] Sin[v] - Sin[u/2] Sin[2 v]) Sin[u],
- Sin[u/2] Sin[v] + Cos[u/2] Sin[2 v]}, {u, 0,
- Pi + If[t > 2, If[t < 2 + Pi, (t - 2), Pi], 0]}, {v, 0,
- Pi/4 + If[t < 3 Pi/4, t,
- If[t < 2 + Pi, 3 Pi/4,
- If[t < 2 Pi + 2, 3 Pi/4 + t - 2 - Pi, 7 Pi/4]]]},
- PlotRange -> {{-4, 4}, {-4, 4}, {-2, 2}}, Boxed -> False,
- Axes -> None, PlotStyle -> Red,
- ViewPoint ->
- v], {v, {{10 Sin[\[Theta]], 10 Cos[\[Theta]],
- 3}, {10 Sin[\[Theta]], 10 Cos[\[Theta]], 3}}}]}]
- , {t, 0, 2 Pi + 3}]
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