Leitha & Mark Hyde wrote:
> 
> Can someone tell me what went wrong and how to fix it, please?
> 
> The problem only appeared when "Building3" was placed in a difference
> statement and only affects the section called "Building3.  The part of the
> code for the building is included below:
> 

> #declare Building3 = difference {
>   box{<50, 50, 50> <100, 50, 0>
>                          

Is it me, or you intend to have a VERY FINE box in a difference ?
 (look at the .y : 50 to 50 : no thickness)

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