John VanSickle wrote:

> I avoided using the trig functions.  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.

Bzz, wrong!
Run this code:

#macro Test(a,b) a-b #end
#render concat(str(Test(2*5,2*4-2*3),1,0),"\n")
sphere{0,1} //So POV doesn't whine

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