I kind have answered this question on the Talkgraphics forum for you - you have to fake it, is the solution. Another solution, which I didn't think of that board. Copy your circle shape you are using for a a top down dome, change its color (lighter if you can, otherwise darker). Combine/Slice it into equal pie cuts with lines of some width 0.5 or wider. If you used a rounded bevel on your dome shape to imply the dome shape surface shadow, you can apply a Stained-Glass transparency on the cut shape, that will allow the shadow surface of the dome beneath to show through, and thus imply your dome with verticle lines. Understand?