This scenery yields the throat of a naked rotating worm-hole.

1e3
100000
4.31e6
0.9
1

             2e-7
             1e-5
             1e9

             80
             3.1415
             -1.5708
            500
            11.36 11.36

Spectrum
4 8.3
9000
5.3e10
10
300.
0.
Increase SafetyValue if you have trouble resolving the surface of the doughnut. Increasing SafetyValue also increases computation time. The default value is slightly more conservative.
-1000.
4