>>>Does POV-Ray support hierarchy of objects ?
>>>
>>>I don't find anything about that in the doc.
>>
>>If you suggest me Union, where is the new centroid ?
> 
> 
> Whatever technique you use to determine the centroid of the parts will
> presumably still work for the centroid of the union.

Well, suppose I want to do a solar system. All the planets are supposed 
to turn around the sun (don't care about spin), and follow it when the 
sun turns around the center of the galaxy.
I mean thiskind of hierarchy.

But there isn't any hierarchy in the union, I guess.
All the objects are equal.

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