On 2004-05-28 13:13:44 +0100, Warp <war### [at] tagpovrayorg> said:

[...]


>   This means that if you give it an identifier, any modification the macro
> makes to the parameter (even if it's done with #local) will be made to
> the original identifier.

This is completely new to me. I will try and read up on this, as it is 
a fundamental point. Thanks for the lucid explanation.

The solution worked by the way. :-)

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