I am attempting to export a 3D plot from mathematica with no background, but I seem to be unable to find a way.
ParametricPlot3D[{{Cos[x], Sin[x], x}, {Sin[x], Cos[x], x}}, {x, 0,
1}, PlotLegends -> {a, b}, Background -> None]
Export["test.eps", %, Background -> None]
The background of the legend is transparent, but not that behind the figure. I am able to do it in the case of 2D plots.