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Peter et al
Ok I admit it, I don't spend long enough framing my questions and I
use sloppy language. I also admit you are right, macros are elegant. I
only wanted a way to modify existing code and not have to learn more
than I have to as I get distracted too easily. Coding does not come
naturally to me and by the time I have worked out what is required I
could have built a physical model and photographed it.
If macros are the way to go in SDL then it would have been nice if
that had been gently pointed out. I have always hoped that these
groups are to help people with problems. It reinforces the reason that
in using POVRAY for more than five years I have seldom posted a
message.
Unless someone can help me with my problem I suggest we close this
thread and go off topic with any other comments. Remember it costs
nothing to be polite. 

Stephen

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