Thanks Everyone.  I sort of figured it had something to do with the matrix.
Any ideas on how I could fix this and still get the slant in the jaw?

"Greg M. Johnson" <gre### [at] my-dejanewscom> wrote in message
news:3A82CD5D.E0681695@my-dejanews.com...
> "Marc A. Lavoie" wrote:
>
> > > The main portion of the head is a cylinder component scaled down in Y
and
> > > matrixed to give the jaw line an upward tilt.
>
> The matrix operation is your problem.  Without it, the demarcation in
pigment
> disappears.
>
> It looks like pigments, matrices, and blobs don't work well together.
Don't
> know if this is a bug or what...
>
> Simplified version of your code below, zooming in on the chin at an angle:
>
> #include "colors.inc"
> background{Blue}
> camera{location<0,1,-10> look_at<-.6,0.4,0> angle 4 }
> light_source{<5,5,-20> color White*1.5}
> #declare head=
>         blob{   threshold .35
>                 cylinder{<0,-.5,0><0,1,0>,.55,10
>                         scale<1,.6,1>
>
>                         //COMMENT OUT THIS LINE TO SEE SMOOTH PIGMENT//
>                         matrix< 1, 0, 0, 0, 1, 0, 0,.4, 1, 0, 0, 0>
>                         //YES, THAT LINE ABOVE THIS ONE!
>                         }
>                 sphere{<0,0,0>.3, 2 scale<1.2,.6,.5> rotate x*-45
> translate<0,-.6,-.35>}
>
>                 texture{pigment{Yellow}}
>            }
>
> object{head rotate <90,90,0>}
>
>


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