WHEW! Lesson 1. You dont need the hot point or the object actually touching the surface on which it has to be replicated. (I allways thought you did!) Lesson 2. You DO need still to do a LOT of rotating to get it to look right.

In this instance I used a shading domain of the inner surface of the inner half shell.

The odd look? renders of the between inner and outer shells is because iI used several shells, some overlapping.

Thanks for taking an interest and giving me ideas to investigate.

Brian

bwtr