"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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