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I need to make semitransparent coordinate plane(s) at ParametricPlot3D with one parameter. If I add the second parameter the curves becomes ugly.

 GraphicsRow[{
   ParametricPlot3D[{
     {Sin[u], Tan[u], u/10}, 
     0.5 {Cos[u], Sin[u], u/10}}, 
   {u, -20, 20},  BoxRatios -> {1, 1, 1}], 
   ParametricPlot3D[{
     {Sin[u], Tan[u], u/10}, 
     0.5 {Cos[u], Sin[u], u/10}, 
     {u/10, v/10, 0}}, 
  {u, -20, 20}, {v, -20, 20}, BoxRatios -> {1, 1, 1}]}]

enter image description here

enter image description here How I can fix it?

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1 Answer 1

up vote 2 down vote accepted

Just make two separate graphics and combine them using Show

Show[{ParametricPlot3D[{{Sin[u], Tan[u], u/10}, 
    0.5 {Cos[u], Sin[u], u/10}}, {u, -20, 20}], 
  ParametricPlot3D[{u/10, v/10, 0}, {u, -20, 20}, {v, -20, 20}, 
   PlotStyle -> {Opacity[0.3, Magenta]}]}, BoxRatios -> {1, 1, 1}]

Mathematica graphics

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