Among other things, Laurent Duperval wrote:

>>I made such a macro for the inscription of the One Ring:
>>
>>  http://news.povray.org/povray.binaries.images/33166/
> 
> I'm interested in the engraved portion of your image. The reason I was
> looking for my message is that I had received an explanation that (I
> think) expleined how to have a beveled/relief effect in a sphere. I wanted
> to try a couple of thing: letters that protude from a sphere and letters
> that are engraved in a sphere. You seem to have done that part well in
> your Ring. How's it work?

I've posted the code to p.b.scene-files, with the title "Inscription macro".

The case of negative radius is thought for the inner inscription of the 
ring, which should run "backwards".

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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