Wasn't it BoudewijnDocter who wrote:
>Hi,
>
>I'm having trouble using the cutaway_textures feature when trying to cut
>something with a complex csg. The following simplified code illustrates my
>problem:
>
>#include "colors.inc"
>
>camera {location <3,4,-4> look_at 0 }
>light_source {<10,20,-5>, rgb 3}
>
>#declare MyObject = union {
>  box {<-1,-1,-1>,<1,0,1> pigment {Red} }
>  box {<-1,0,-1>,<1,1,1> pigment {Blue}}
>}
>
>#declare MyCuttingObject = difference {
>  cylinder {<0,-2,0>,<0,2,0>,1}
>  box {<0,-3,-1>,<1,3,0>}
>}
>
>difference {
>  object {MyObject}
>  object {MyCuttingObject}
>  cutaway_textures
>}
>
>I've got two colored boxes on top of each other, which I want to cut with an
>object that is a construction of two objects. Obviously I would like to see the
>colors inside the cut, hence the cutaway_textures, but this doesn't seem to
>work. Is there anyone who has the golden tip?

It looks like a bug. A rather ugly workround is to do this:

union {
  difference {
    object {MyObject}
    cylinder {<0,-2,0>,<0,2,0>,1}
    cutaway_textures
  }
  intersection {
    object {MyObject}
    box {<0,-3,-1>,<1,3,0>}
    cutaway_textures
  }
}

-- 
Mike Williams
Gentleman of Leisure

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