Deneux Johann wrote in message <355F26DB.30CB6D30@club-internet.fr>...
>Hello everybody. I have encountered a problem, what could even be a bug.
>
>This is a CSG-problem. Try this little scene:
>
>
>#include "colors.inc"
>
>/* Prints a 'L' in a white pannel */
>difference {
> // The panel
> box {<-1,-1,0.5>, <17,12,2>}
> // The 'L'
> union {
>  box {<0,0,0>, <1,9,1>}
>  box {<0,0,0>, <6,1,1>}

Here's your problem. Coincident surfaces. Pov-Ray can't decide which to
show.
Try this:

union

  box { <0,0,0>,<1,9,1>}
  box { <0,0,0>,<6,1,1.0001> }


That will solve the problem.

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