YES! how simple!  I was incorrectly thinking that gradient x had to anchor
itself off the leftmost edge of the object, and hence all my confusion.

Mark Wagner wrote:

> Try this:
> pigment
>
>     gradient x
>     pigment_map{
>         [0       Black]
>         [0.5       Black]
>         [0.5     White]
>         [1       White]
>     }
>     translate x*-0.5 /* Center the map */
>     scale <10000,1,1> /* Make this as large as you want */
> }
>
> /* Mark */

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