Wasn't it slehar who wrote:
>"Chris B" <nom### [at] nomailcom> wrote:
>> "slehar" <sle### [at] gmailcom> wrote in message
>> news:web.487a73ecc7f877ecf75a90cb0@news.povray.org...
>>
>> #declare myVector = <1,2>;
>> #debug concat("myAngle: ", str(atan2(myVector.y,myVector.x),3,3),"\n")
>>
>> writes "myAngle: 1.107" into the message stream for me on 3.6 under Windows.
>> What version are you running?
>>
>> Regards,
>> Chris B.
>
>Wow, thats bizarre! That code works for me too! But when I put the atan2( ) in
>the density function where I need it, it doesn't work!

The problem isn't the atan2(), you can't mention vectors inside a 
function. You can so this:

#declare mX = myVector.x;
#declare mY = myVector.y;

...
   function {
     ... atan2(mX,mY) ...
   }

-- 
Mike Williams
Gentleman of Leisure

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