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• start animation

rE=1+Sqrt[1-a^2 Cos[θ]^2]; RE[A_]:={Sqrt[rE^2+A^2] Sin[θ]Cos[φ],Sqrt[rE^2+A^2] Sin[θ]Sin[φ],rE Cos[θ]};  (* outer ergosphere *)
rG=1-Sqrt[1-a^2 Cos[θ]^2]; RG[A_]:={Sqrt[rG^2+A^2] Sin[θ]Cos[φ],Sqrt[rG^2+A^2] Sin[θ]Sin[φ],rG Cos[θ]};  (* inner ergosphere *)
rA=1+Sqrt[1-a^2]; RA[A_]:={Sqrt[rA^2+A^2] Sin[θ]Cos[φ],Sqrt[rA^2+A^2] Sin[θ]Sin[φ],rA Cos[θ]};              (* outer horizon *)
rI=1-Sqrt[1-a^2]; RI[A_]:={Sqrt[rI^2+A^2] Sin[θ]Cos[φ],Sqrt[rI^2+A^2] Sin[θ]Sin[φ],rI Cos[θ]};              (* inner horizon *)
p[f_, c_]:=ParametricPlot3D[f, {φ, 0, 2 π}, {θ, 0, π}, PlotStyle -> Directive[c, Opacity[0.15]]]             (* plotfunction *)
Do[Print[Show[p[RE[a], Blue], p[RA[a], Cyan], p[RI[a], Orange], p[RG[a], Red]], {a,0,1,0.1}]]            (* cartesian, x,y,z *)
Do[Print[Show[p[RE[0], Blue], p[RA[0], Cyan], p[RI[0], Orange], p[RG[0], Red]], {a,0,1,0.1}]]      (* pseudospherical, r,θ,Ф *)

• Boyer-Lindquist: doi:10.1139/p81-086 Nigel Sharp: On embeddings of the Kerr geometry; page 3, figure 3
• Kerr-Schild: Matt Visser: The Kerr spacetime, A brief introduction; page 35, figure 3
• Source: kerr.yukterez.net / kerr.newman.yukterez.net

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