In article <38C9B210.6698DB45@erols.com>, John VanSickle 
<van### [at] erolscom> wrote:

> ... I also made local copies of the arguments, so that if the user 
> passes an expression as one of the arguments, that expression will be 
> evaluated.  For instance, this macro
> 
>   #macro MyMacro(A,B) (A-B) #end
> 
> can be invoked this way:
> 
>   #local J=MyMacro(77*2,45*2-23*3);
> 
> which POV-Ray will evalaute as:
> 
>   #local J=77*2-45*2-23*3;
> 
> which is almost certainly *not* what the user wanted.

POV always evaluates the parameters, which is one of it's differences 
with C macros.
See this section in the manual: 4.2.8.3  Are POV-Ray Macros a Function 
or a Macro?

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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