Am 09.01.2016 um 23:01 schrieb Cousin Ricky:
> "Norbert Kern" <nor### [at] t-onlinede> wrote:
>> "Norbert Kern" <nor### [at] t-onlinede> wrote:
>>
>>> I can confirm this for 3.6.2, but not for 3.7.0msvc10.win64.
>>
>>
>> I've to add the additional point, that it only renders correct with 3.7, when
>> the version statement is changed to "#version 3.7;", otherwise it's like you
>> described...
> 
> Ah, so it appears to have been a bug in 3.6, which was corrected in 3.7, but
> retained in compatibility mode.

Exactly.

I wasn't aware of this effect in particular, but POV-Ray 3.6 did have
some peculiar quirks when it came to sky spheres. This was changed in
POV-Ray 3.7, with the aim that

- sky sphere behaviour is consistent with that of a textured sphere with
an emission-only finish, and

- background behaviour is consistent with that of a sky sphere with
uniform pigment.

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