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image = Import["http://i.stack.imgur.com/6YRfK.jpg"]; If you want to use your f, uRange and vRange as the arguments to ParamatricPlot3D, you need to wrap each with Evaluate: f = {u, Sin[v]*(u^3 + 2 u^2 - 2 u + 2)/5, Cos[v]*(u^3 + 2 u^2 - 2 u + 2)/5}; uRange = {u, -2.3, 1.3}; vRange = {v, 0, 2 Pi}; ParametricPlot3D[Evaluate@f, Evaluate@uRange, ...



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