None <Non### [at] onca> wrote in news:Xns### [at] 204213191226:

> Tor Olav Kristensen <tor_olav_kCURLYAhotmail.com> wrote in 
> news:Xns### [at] 204213191226:
> 
>>   #local R = f_r(Q.x, Q.y, Q.z);
> 
> Is "f_fr(x,y,z)" much faster than "sqrt( x*x + y*y + z*z )"?  I'm
> wondering because I don't find it reads better and perhaps the
> overhead of including "functions.inc" (if one wasn't using it in the
> first place) might not make it that beneficial?

Since f_r() is a built in function in POV-Ray, it should be a
little bit faster. But I doubt that you will be able to measure
any significant speed increase with it in your macros.

Here is how it is declared in functions.inc:

#declare f_r = function { internal(57) }

I just suggested using it because _I_ find it easy to read.
Maybe this comes from my extensive use of it within the
functions for my isosurfaces...

(Note that it isn't much overhead for POV-Ray to include
functions.inc.)



Tor Olav

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