Wasn't it John VanSickle who wrote:
>gregjohn wrote:
>> I have an interesting object{}. It itself is a union of multiple,
>> interestingly-shaped objects of different colors. I want to get a 
>>cross section
>> of it and see the colors of the different layers.
>>  Every way I've tried, however, gives the cross-section the texture 
>>of the
>> cutting object.  Any way to see the colors in my multi-layer cake?
>
>Consider this simple intersection:
>
>intersection {
>  sphere { -x,2 texture { Rubber } }
>  sphere {  x,2 texture { Chalk } }
>}
>
>One side is Rubber and the other is Chalk, as we expect.  The space 
>between the surfaces has an interior assigned to it, but it has no 
>texture associated.  In POV-Ray, the interior of an object does not 
>have an associated texture that can be seen when an untextured object 
>intersects into that interior.

When you apply cutaway_textures to an object with overlapping parts, you 
get the average of the textures of those parts.

-- 
Mike Williams
Gentleman of Leisure

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