Hi Walters, you recently wrote in moray.win:

> Are there any differences between a
> Group and a CSG union? When to use
> which?
As far as POV-Ray is concerned: 
They used to be different back in the old days. One of the earlier
POV-Ray versions had a composite object that you could group objects
with. This was later integrated with the union. So, by now, they are
basically the same thing. 

As far as Moray is concerned: 
You can only add primitive objects to a CSG, since otherwise the
render may not be what you wanted. Also, you cannot add a light to a
CSG object, you'll need to make a group if you want to place a light
in a group.

> Besides all that I would like to know
> what stands CSG for.
Constructive Solid Geometry.

- Lutz
  email : lut### [at] stmuccom
  Web   : http://www.stmuc.com/moray

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