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Consider

curves = {{x, x, 0}, {x, 2 x, 0}}
ParametricPlot3D[curves, {x, 0, 1}]
ParametricPlot3D[curves, {x, 0, 1}, PlotStyle -> {Red, Green}]
ParametricPlot3D[{{x, x, 0}, {x, 2 x, 0}}, {x, 0, 1}, PlotStyle -> {Red, Green}]

In the first two cases, neither does ParametricPlot3D automatically colour grade the curves nor apply the explicit PlotSyle.

It works as intended in the third syntax.

Why is this so?

Note:Doesn't occur in Plot,Plot3D,ParametricPlot

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1 Answer 1

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$\begingroup$ 
curves = {{x, x, 0}, {x, 2 x, 0}};

ParametricPlot3D[Evaluate @ curves, {x, 0, 1}]

enter image description here

ParametricPlot3D[Evaluate @ curves, {x, 0, 1},    PlotStyle -> {Red, Green}]

enter image description here

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    $\begingroup$ works but why is it needed here and not for others, say plot3D? $\endgroup$
    – lineage
    Commented May 3, 2020 at 22:52
  • $\begingroup$ @lineage, not sure why. $\endgroup$
    – kglr
    Commented May 3, 2020 at 22:58

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