difference {
        box {
                <-10, 0, -10>  // one corner position <X1 Y1 Z1>
                < 10,  20,  10>  // other corner position <X2 Y2 Z2>
                pigment { color rgb <1,0,0> }
        }

        union {
                box {
                        <-9,0, -9>
                        <9,19,9>
                        pigment {color rgb <1,0,0> }
                }

                box {
                        <-2.5,0,-10>
                        <2.5,5,-5>
                        pigment {color rgb <1,0,0> }
                }
       }
}


Somebody tell me what I'm doing wrong there, or somehow to get the second
box to subtract as well

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Bob wrote:
>difference {
>        box {
>                <-10, 0, -10>  // one corner position <X1 Y1 Z1>
>                < 10,  20,  10>  // other corner position <X2 Y2 Z2>
>                pigment { color rgb <1,0,0> }
>        }
>
>        union {
>                box {
>                        <-9,0, -9>
>                        <9,19,9>
>                        pigment {color rgb <1,0,0> }
>                }
>
>                box {
>                        <-2.5,0,-10>
>                        <2.5,5,-5>
>                        pigment {color rgb <1,0,0> }
>                }
>       }
>}
>
>
>Somebody tell me what I'm doing wrong there, or somehow to get the second
>box to subtract as well
>

What are you trying to do?

The first box appears to almost entirely enclose the union except for the -z
edge of the last box which is the same as the first (look up "co-incident
surfaces), so a visible result should be either non-existent or else
generate artifacts.

If you're trying to make the first box hollow with a door (I *think* that's
your intent...) then try on the last box using <-2.5,0,-10.1> as the back
corner.

RG

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Ignore that last message :-/ I was changing the wrong point

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