I'm attempting to use this and I seem to have failed to understand how this 
Macro works.  

What I've defined is this:
----------------------------
#declare HF_R=seed(0);

#macro HF_F(X, Y, Z)
   rand(HF_R);
#end

#declare Ground=HF_Square(HF_F, false, false, <40, 40 >, 1, "", <-20, -1, -
20>, <20, 4, 20>)

object
{
   Ground
}
----------------------------
This of course bombs completely.. so how does one use the HF_Square macro? 
It's not obvious and there are no examples I could find.

Clue me in please?

Stephen

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