On Mon, 2 Jun 2003 09:56:39 -0400, "Mario" <ant### [at] spamcopnet> wrote:
>    box {
>        <-10, -1, -10>,  // Near lower left corner
.......................
>    box { <4,-1,-9.875>,

This "-1" cause two walls on the same plane. You probably want something like

    box { <4,-1.01,-9.875>,

for second box. Do you know why ?

ABX

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