Is it possible to create an annular vault?

I have created groin vaults and barrel vaults but an annular vault eludes me. I can’t find any suggestions on the web (relating to SU). I was hoping to find some help here. I’m hoping that SU Pro or Ruby won’t be necessary - but I may be dreaming.

Many thanks for any suggestions. Ed.

Have you tried the Follow Me tool?


Something like this?


This is brilliant and solves my problem very nicely. Thanks so much. I’m trying to do a little model of the Theater of Marcellis in Rome and this will be perfect!!