Hello everyone. Here's my code. All I need is to place them into one plot. Is it possible?
R = 7.28;
RevolutionPlot3D[
If[t <= R, 1/(\[Pi] R^2), 0], {t, 0, 2 6.28}, {\[Theta], 0,
3/2 \[Pi]},
PlotStyle -> Directive[Orange, Specularity[White, 4], Opacity[0.99]],
PlotPoints -> 100, Mesh -> 20,
MeshStyle -> Directive[AbsoluteThickness[2.], Opacity[0.99]],
MaxRecursion -> 0, AxesLabel -> {"x", "", "\[Rho](x)"},
LabelStyle -> Large, ViewPoint -> {1.3, -3.4, 1.}, ImageSize -> Full]
R = 6.28;
a = 0.535;
RevolutionPlot3D[
1/(\[Pi] R^2) 1/(1 + E^((t - R)/a)), {t, 0, 2 R}, {\[Theta], 0,
3/2 \[Pi]},
PlotStyle -> Directive[Orange, Specularity[White, 4], Opacity[0.99]],
PlotPoints -> 100, Mesh -> 20,
MeshStyle -> Directive[AbsoluteThickness[2.0], Opacity[0.6]],
MaxRecursion -> 0, AxesLabel -> {"x", "", "\[Rho](x)"},
LabelStyle -> Large, ViewPoint -> {1.3, -3.4, 1.}, ImageSize -> Full]