> What you can do is take the object and make it into an isosurface, then use that
> function like: function {Object (x, y, 0)} which will scale the object
> infinitely in the z direction.
> But wait - there's more!
> Now use that function in a pigment pattern, and you get a silhouette (shadow) of
> the object.
> 
> Easy to do for cardinal axis aligned shadows, takes a little bit more to do
> off-axis either by pre-rotating the object and then rotating the pattern back,
> or maybe by doing some vector normal to a plane type stuff...
> 

The problem with that option is the infinite gradient because the 
function returns only zero or one.

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