In article <slr### [at] fwicom> , ron### [at] povrayorg (Ron
Parker) wrote:

>>But I tried to define a sqr macro as follows:
>>
>>#macro sqr(A)
>>A*A
>>#end
>>
>>and I got
>>
>>Parse Error: Expected 'undeclared identifier', sqr found instead.
>
> What if you define it as a function instead, since that's what you really
> want?

I would not recommend using a function for such a simple case.  It will work
for sure, but there is some overhead involved that (if used carelessly) can
slow down rendering of isosurfaces a lot.  The built-in operators should be
used whenever possible as they offer by far the best performance.


    Thorsten


____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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