I know what ifdef does (the example below shows me using it)...

//#declare text2use = 2;

box     {
        <-10,0,11>,<10,10,10>

        #ifdef(text2use)
                texture { pigment { White } }
        #else
                texture { pigment { Green } }
        #end

        }

.... but I'm struggling to understand when you would use it. Why would you refer
to a variable you've not defined?  Isn't that just sloppy coding.

Has anyone got/had a real-use case for this command? I'd love to know what I'm
missing out on.

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