Hello,


After trying out various sources*, I realize that anything related to 
reading and writing in exr format on Mac does not work.

My version is :
Persistence of Vision(tm) Ray Tracer Version 3.8.0-beta.2.unofficial
Compiler: Apple LLVM 12.0.5 (clang-1205.0.22.11)


Is this a general bug in POVRay or is it specific to Mac?





* :
<https://www.lilysoft.org/CGI/SR/Spectral%20Render.htm>
<http://www.ignorancia.org/index.php?page=lightsys>
...


-- 
kurtz le pirate
compagnie de la banquise

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hi,

kurtz le pirate <kur### [at] freefr> wrote:
> After trying out various sources*, I realize that anything related to
> reading and writing in exr format on Mac does not work.
>
> My version is :
> Persistence of Vision(tm) Ray Tracer Version 3.8.0-beta.2.unofficial
> Compiler: Apple LLVM 12.0.5 (clang-1205.0.22.11)
>
> Is this a general bug in POVRay or is it specific to Mac?

can you please post a scene plus image ?  I don't use Apple but I'd like to try
it here (the most "exotic" file format I have to hand is one hdr image :-)).


regards, jr.

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On 2025-12-27 06:37 (-4), kurtz le pirate wrote:
> 
> After trying out various sources*, I realize that anything related to
> reading and writing in exr format on Mac does not work.
> 
> My version is :
> Persistence of Vision(tm) Ray Tracer Version 3.8.0-beta.2.unofficial
> Compiler: Apple LLVM 12.0.5 (clang-1205.0.22.11)

Did you compile this yourself?  If the OpenEXR development library is
not installed on your computer, the POV-Ray build will just skip it and
compile successfully without it.

> Is this a general bug in POVRay or is it specific to Mac?

I suppose whether this is a bug or a feature is open to interpretation.
I have openSUSE GNU/Linux.

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On 27/12/2025 15:58, Cousin Ricky wrote:
> On 2025-12-27 06:37 (-4), kurtz le pirate wrote:
>>
>> After trying out various sources*, I realize that anything related to
>> reading and writing in exr format on Mac does not work.
>>
>> My version is :
>> Persistence of Vision(tm) Ray Tracer Version 3.8.0-beta.2.unofficial
>> Compiler: Apple LLVM 12.0.5 (clang-1205.0.22.11)
> 
> Did you compile this yourself?  If the OpenEXR development library is
> not installed on your computer, the POV-Ray build will just skip it and
> compile successfully without it.


No, i use an unofficial version compiled by Yvo Smellenbergh



>> Is this a general bug in POVRay or is it specific to Mac?
> 
> I suppose whether this is a bug or a feature is open to interpretation.
> I have openSUSE GNU/Linux.
> 

Hum... not a feature. The error message is :
Cannot initialize semaphore (Function not implemented).


I don't know if OpenEXR isn't implemented at all or if there's a problem.




-- 
kurtz le pirate
compagnie de la banquise

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On 27/12/2025 13:04, jr wrote:
> hi,
> 
> kurtz le pirate <kur### [at] freefr> wrote:
>> After trying out various sources*, I realize that anything related to
>> reading and writing in exr format on Mac does not work.
>>
>> My version is :
>> Persistence of Vision(tm) Ray Tracer Version 3.8.0-beta.2.unofficial
>> Compiler: Apple LLVM 12.0.5 (clang-1205.0.22.11)
>>
>> Is this a general bug in POVRay or is it specific to Mac?
> 
> can you please post a scene plus image ?  I don't use Apple but I'd like to try
> it here (the most "exotic" file format I have to hand is one hdr image :-)).
> 
> 
> regards, jr.
> 

Look at <https://www.lilysoft.org/CGI/SR/Spectral%20Render.htm> and 
render ColorChecker.pov by following the instructions
Setion "First Step" on the web page.

command line attributes :
+W800 +H600 +A0.1 +AM2 +R3 +FE +KI1 +KF36 +KFI38 +KFF73

+FE is exr file format.



Later, on "SpectralComposer.pov", exr format is used :

#declare F[I] = function {
  pigment {
   image_map {exr concat(FName, str(I+38,0,0))} translate -0.5
   }
  }





-- 
kurtz le pirate
compagnie de la banquise

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