> > isosurface{
> >         function{ abs(x)+abs(y)-1}
> >         contained_by {box{-1,1}}
> >         pigment{color White}
> > }
>
> The object would be an infinite bar, something like a
>   box {<-1,-1,-infinity> <1,1,infinity>}

Err, sorry. That's wrong. At least, there is a
  scale sqrt(0.5)  rotate 45*z
missing. So, no, it is not a problem of coincident surfaces.

But then, the length of the gradient is sqrt(2) everywhere.
Maybe it is just a matter of increasing max_gradient to 1.5.

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