Greg M. Johnson <"gregj;-)56590""@aol.c;-)om> wrote in message
<38ebfafb$1@news.povray.org>...
>How do I set up something that is black on the left and white on the
>right? Before you answer, I want the demarcation at x=0, and the max &
>min extent in x can vary wildly, and it's a BLOB!
>The following solution won't work, because it is reflected over the x=0
>plane.


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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