"Mark Harris" <mh### [at] csappstateedu> wrote :
>
> Is there some magic configuration option for enabling reflection from both
> sides of a surface?  What am I missing?

    I just looked at it and it's not you, it's the sample code. They seem to
have forgotten to use the "open" command after the point list. That leaves a
cap on the surface which is reflecting the bluish gray background.

    <3.0,  10.0>,
    <4.0,  11.0>
    open

    ^^^^ add that and it should help.

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