you got
union {

    box texture {red}
    box texture {blue}
}
and you want to subtract
box texture {black}
without black coor

then do this

intersection {
            union {
                    box red
                    box blue
                }

            box {<...>,<...> texture {black} inverse}
}


insteed of getting the difference ,   une the intersection of your object
with all_the_outside of you second object by using the inverse keyword into
your black box






news:43971e49$1@news.povray.org...
> Hello Roman, Thanks for your quick response.
> Maybe I was also too quick when I wrote the question.
> The problem is the folowing:
>
> Imagine that I have 2 boxes: 1 is red and the other is blue and they are
> one ontop of the other. If I cut this with a Black box I obtain a black
> edge. But i want the edge red and blue. It is not a problem of total
> pigments or final pigments (or textures), the problem is that i want to
> see the "real" cut of the first object. Maybe this is just fundamental
> problem in Pov-ray because all objects are empty and you only see
> surfaces. I was just wondering if anybody have had this problem and have
>   solved it. Imagine that you have a Ham and Cheese Sandwich and u cut
> it with a red knife. I don't want to see a red cut but the edge of the
> bread, the ham and the cheese.
>
> Alvaro
>
> Roman Reiner wrote:
>
> > First of all this is the wrong newsgroup. such questions should be
posted in
> > newusers http://news.povray.org/povray.newusers/
> >
> > To answer your question. When i understand you right you want the
resulting
> > object to have one overall texture. in this case it is the easiest way
not
> > to use pigments (or textures) in the single object declarations but
apply
> > it once to the resulting cutobject. for example
> >
> > difference {
> >   object { this }
> >   difference {
> >     object { that }
> >     merge {
> >       object { whatever }
> >       ...
> >     }
> >   }
> >   ...
> >   texture { myTexture }
> > }
> >
> > Hope that helped
> > Regards Roman
> >
> > Alvaro Blanco <abl### [at] icmmcsices> wrote:
> >
> >>Hello all,
> >>This is my first post and maybe I ask a silly (beginner) question: When
> >>you use difference you get the color of the object you substract. When
> >>you substract something easy, let's say, a box A minus a box B, then it
> >>is easy to get the right color in your cut surface. You just use the
> >>same color for B. But, when A is something composed of many different
> >>objects with many different colors... Is there any way or "trick" to get
> >>this colors in the cut edge instead of the same color of B?
> >>Thanks
> >
> >
> >
> >

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