Andrey K. scripsit::
> Pre Scriptum: Sorry for my english language.
> 
> N.B. Abstract article.
> 
> I think, may the "minus" clause be useful for "union" and "merge" ?
> Often need make hole, and then allocate in this hole some object. For
> example:
> wall_object, window_hole_object, and window_frame_object (with glasses and
> curtains :) ).
> 
> Normal way, to make it:
> 
> union{
>   // making wall with hole
>   difference{
>     wall_object
>     window_hole_object
>   }
>   // making holled wall with window
>   window_frame_object
> }
> 
> Using "minus" clause:
> 
> union{
>   wall_object
>   // making wall with hole
>   MINUS window_hole_object
>   // making holled wall with window
>   window_frame_object
> }
> 
> Difference between both cases not very match, but (I think), second case is
> more readable.
> 
> 
> 
This look purely like syntaxing sugar (and it tastes bad too me).
Please draw your CSG tree for both, and explain the difference if any.

I do not see the interest, moreover it is confusing when used on
something like:

union { a
        b
        minus c
        d
      }

would you subtract c from b or (a+b) ?

Also, how would you interpret
union { a minus b minus c d } ?

Too much ambiguity for my taste.

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