Tor Olav Kristensen wrote:

> Slime wrote:
> 
>>>  If the functions supported true recursion it would be rather easy:
>>>
>>> #declare MandIter =
>>>  function(n, Re, Im, Zr, Zi)
>>>  { select(n>50 | Zr*Zr+Zi*Zi > 2, 0,
>>>           MandIter(n+1, Re, Im, Zr*Zr-Zi*Zi+Re, 2*Zr*Zi+Im), n/50)
>>>  }
>>>
>>> #declare Mandel = function(Re, Im) { MandIter(0, Re, Im, Re, Im) }
>>>
>>>  (Now you could do for example "pigment { function { Mandel(x,y) }
>>
>>
>> ... }".)
>>
>> And you can! Looks good. =)
> 
> ...
> 
> Woaw ! That's nice. AFAIR from the pre-beta test period for v3.5,
> it should not be possible for users to define recursive functions.
> 
> But obviously this has changed since then. (Unintentionally ?)


Here's what happened when I tried the same with v3.5:

   Persistence of Vision Ray Tracer(tm) for Windows.
   ...
     This is version 3.5.icl.win32.
   ...
   File: E:\Raytracinger\RecursiveFunctionTest.pov  Line: 14
       )

     } <----ERROR

   Parse Error: Recursive function calls are not allowed!


   Returned from renderer with error status



This time I also checked the output when rendering with v3.6:

   Persistence of Vision Raytracer(tm) for Windows.
   ...
     This is version 3.6.1.icl8.win32.
   ...
   File: E:\Raytracinger\RecursiveFunctionTest.pov  Line: 14
   Possible Parse Error: Recursive function calls are not allowed!



- So it should still not be possible.

-- 
Tor Olav
http://subcube.net
http://subcube.com

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