Am 18.02.2017 um 15:25 schrieb kurtz le pirate:
> Le 18/02/2017 à 13:33, clipka a écrit :
>> Are you sure this is a genuine POV-Ray scene (as opposed to e.g. a
>> MegaPOV scene)? I'd be surprised if POV-Ray ever ditched any of its
>> inbuilt functions or renumbered them.
>> ...
>> [snip]
>>
> 
> Thanks for your help, and yes, it's a POVRay scene.
> Here the begin of the code :
...
> #declare f_mandelbulb=function{internal(79)};

Ah! The famous Mandelbulb function!

I'm sorry, but it is /not/ really a POV-Ray scene: It is a scene for a
special /patched/ version.

The other fellows' posts might provide useful pointers.

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