> Can anybody tell me what I'm doing wrong or make any suggestions?

> isosurface{
>         function{ abs(x)+abs(y)-1}
>         contained_by {box{-1,1}}
>         pigment{color White}
> }

You have coincident surfaces of the object and its container.
The object would be an infinite bar, something like a
  box {<-1,-1,-infinity> <1,1,infinity>}
Changing the contained_by to
  contained_by {box <-2,-2,-1> <2,2,1>}
should do the trick.

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