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From: clipka
Subject: Re: 3.7rc6 on Raspberry PI, with/without openexr image artifacts
Date: 13 Dec 2012 08:48:44
Message: <50c9dcbc$1@news.povray.org>
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Am 13.12.2012 08:52, schrieb clipka:
> Am 13.12.2012 00:24, schrieb clipka:
>
>> Apparently the problems are related to the -ffast-math compiler option;
>> I'll try whether turning that off will help.
>
> Well, no, not really. No success, except that now the color of the
> artifacts is inverted.
Turning off /all/ optimizations does give the expected results. I don't
consider this an option though, so I guess we'll have to wait for
feedback from the raspbian team.
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clipka <ano### [at] anonymous org> wrote:
> Am 13.12.2012 08:52, schrieb clipka:
> > Am 13.12.2012 00:24, schrieb clipka:
> >
> >> Apparently the problems are related to the -ffast-math compiler option;
> >> I'll try whether turning that off will help.
> >
> > Well, no, not really. No success, except that now the color of the
> > artifacts is inverted.
>
> Turning off /all/ optimizations does give the expected results. I don't
> consider this an option though, so I guess we'll have to wait for
> feedback from the raspbian team.
I just compiled 3.6 on the Raspberry Pi and it has the same issues.
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From: clipka
Subject: Re: 3.7rc6 on Raspberry PI, with/without openexr image artifacts
Date: 1 Feb 2013 14:13:54
Message: <510c13f2@news.povray.org>
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Am 01.02.2013 17:14, schrieb calhjh:
> clipka <ano### [at] anonymousorg> wrote:
>> Am 13.12.2012 08:52, schrieb clipka:
>>> Am 13.12.2012 00:24, schrieb clipka:
>>>
>>>> Apparently the problems are related to the -ffast-math compiler option;
>>>> I'll try whether turning that off will help.
>>>
>>> Well, no, not really. No success, except that now the color of the
>>> artifacts is inverted.
>>
>> Turning off /all/ optimizations does give the expected results. I don't
>> consider this an option though, so I guess we'll have to wait for
>> feedback from the raspbian team.
>
> I just compiled 3.6 on the Raspberry Pi and it has the same issues.
I would have expected that. The Pi seems to have a general problem with
denormalized (i.e. very small) single-precision floating point values.
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From: clipka
Subject: Re: 3.7rc6 on Raspberry PI, with/without openexr image artifacts
Date: 31 Mar 2013 21:57:18
Message: <5158e97e$1@news.povray.org>
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Am 13.12.2012 14:48, schrieb clipka:
> Turning off /all/ optimizations does give the expected results. I don't
> consider this an option though, so I guess we'll have to wait for
> feedback from the raspbian team.
I've received feedback at last: The problem /may/ be solved with
gcc-4.7; I'm currently recompiling POV-Ray on my Pi.
Raspbian Wheezy's standard gcc package is still at 4.6, so I had to
manually install the gcc-4.7 and g++-4.7 packages, and force the
./configure script to actually use gcc-4.7 via the "CXX=gcc-4.7" option.
We shall see in a couple of hours whether that actually solves the issue.
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