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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