It seems that I should do something like
fill fullcircle scaled 4in withshade
define_circular_shade(origin,origin,0 ,2in,white,red);
Sorry for the premature question.
Troy
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If your question is of interest to oth
The command
circular_shade(fullcircle scaled 4in,0,white,red);
in MetaPost does not act as I think it should. It performs a gradient fill
starting at the center of the circle by filling this center in white (which
is expected), and changing the color as the radius/diameter changes (which
is also