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1 Aug 2024 08:14:58 EDT (-0400)
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From: Sebastian H 
Subject: Isosurface warning message
Date: 26 Jan 2006 16:12:24
Message: <43d93b38$1@news.povray.org>
I have a scene that contains some thousand isosurfaces with
slightly different functions. It is so many because I split
up a big isosurface into pieces to gain some render speed.
It actually worked and now the render process takes about
one third of the time it needed before.
But now there occur hundreds of warnings that the max_gradient
is too high. There is no simple way to adjust it into the optimal
range. The value now  is chosen for that it would fit in (nearly)
every case.

All together the test animation that renders at the moment already
makes 4MiB of fatal messages. Even piping everything to /dev/null takes
some seconds for every frame. This also is no real option because I
would like to keep other fatal messages and also don't want to spend
seconds for message disposal.

Is there a way to turn of these "lower max_gradient" messages?

Sebastian


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From: Thorsten Froehlich
Subject: Re: Isosurface warning message
Date: 26 Jan 2006 17:31:39
Message: <43d94dcb$1@news.povray.org>
Sebastian H. wrote:
> I have a scene that contains some thousand isosurfaces with
> slightly different functions. It is so many because I split
> up a big isosurface into pieces to gain some render speed.
> It actually worked and now the render process takes about
> one third of the time it needed before.
> But now there occur hundreds of warnings that the max_gradient
> is too high. There is no simple way to adjust it into the optimal
> range. The value now  is chosen for that it would fit in (nearly)
> every case.
> 
> All together the test animation that renders at the moment already
> makes 4MiB of fatal messages. Even piping everything to /dev/null takes
> some seconds for every frame. This also is no real option because I
> would like to keep other fatal messages and also don't want to spend
> seconds for message disposal.
> 
> Is there a way to turn off these "lower max_gradient" messages?

The messages are warning, not fatal or non-fatal error messages. You can 
either redirect just the warning stream to /dev/null, or, more efficiently, 
you can use the "Warning_Level" INI option and set it to 0. This makes 
POV-Ray internally disregard the warnings relatively early, thus avoiding 
some overhead associated with sending warnings to the output stream.

	Thorsten


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From: Sebastian H 
Subject: Re: Isosurface warning message
Date: 30 Jan 2006 06:03:49
Message: <43ddf295@news.povray.org>
Thorsten Froehlich wrote:
> Sebastian H. wrote:
> 
>> I have a scene that contains some thousand isosurfaces with
>> slightly different functions. It is so many because I split
>> up a big isosurface into pieces to gain some render speed.
>> It actually worked and now the render process takes about
>> one third of the time it needed before.
>> But now there occur hundreds of warnings that the max_gradient
>> is too high. There is no simple way to adjust it into the optimal
>> range. The value now  is chosen for that it would fit in (nearly)
>> every case.
>>
>> All together the test animation that renders at the moment already
>> makes 4MiB of fatal messages. Even piping everything to /dev/null takes
>> some seconds for every frame. This also is no real option because I
>> would like to keep other fatal messages and also don't want to spend
>> seconds for message disposal.
>>
>> Is there a way to turn off these "lower max_gradient" messages?
> 
> 
> The messages are warning, not fatal or non-fatal error messages. You can 
> either redirect just the warning stream to /dev/null, or, more 
> efficiently, you can use the "Warning_Level" INI option and set it to 0. 
> This makes POV-Ray internally disregard the warnings relatively early, 
> thus avoiding some overhead associated with sending warnings to the 
> output stream.

Great, reducing the warning level helps. Thank you very much.
Now I redirect all message streams to separate files respectively.
But the "lower max_gradient" messages definitely end up in the fatal
message file. So are they warnings or fatals or may this even be a bug?
The warning stream file contains just some warnings related to
screen.inc.

There's another curiosity. The first fatal message in the fatal message 
file mentions a max_gradient of 10.850 found whereas the
max_gradient should have had been set to 13.000. But the greatest 
max_gradient value to be found set in the whole scene is 5.0.
Another max_gradient value that can be found set and which possibly
was used is 1.35 (approx. 13.0/10). A max_gradient of 1.085 found also
would be feasible for the used isosurface and it would include a factor
of 1/10. This possible (and strage) multiplication by 10 happens only
for the first isosurface message in the fatal message file.

I rendered the scene with +GFfatal.txt.
Doing "cat fatal.txt | grep found" replies the following.

Shutdown Warning: The maximum gradient found was 10.850, but 
max_gradient of the
Shutdown Warning: The maximum gradient found was 0.670, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.178, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.573, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.846, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.256, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.782, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.456, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.398, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.716, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.404, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.413, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.400, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.309, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.522, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.527, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.597, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.467, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.012, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.066, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.072, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.163, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.287, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.958, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.001, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.996, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.000, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.000, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.223, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.321, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.847, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.541, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.039, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.994, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.368, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.404, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.841, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.388, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.386, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.393, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.888, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.995, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.990, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.284, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.231, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.370, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.884, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.999, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.998, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.200, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.285, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.430, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.885, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.999, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.988, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.265, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.033, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.902, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.083, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.388, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.739, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.952, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.991, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.998, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.998, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.996, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.042, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.305, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.811, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.689, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.019, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.081, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.080, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.163, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.307, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.832, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.423, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.663, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.823, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.849, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.527, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.792, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.815, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.394, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.829, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.771, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.757, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.384, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.914, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.964, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.995, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.041, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.271, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.798, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.264, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.745, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.832, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.372, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.799, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.812, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.202, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.717, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.349, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.329, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.838, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.727, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.346, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.151, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.387, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.786, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.780, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.258, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.212, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.690, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.906, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.927, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.982, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.997, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.263, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.722, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.629, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.158, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.480, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.518, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.697, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.676, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.708, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.549, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.167, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.433, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.465, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.479, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.489, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.670, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.646, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.516, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.340, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.374, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.573, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.414, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.548, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.317, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.565, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.480, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.700, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.258, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.827, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.314, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.747, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.774, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.620, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.606, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.750, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.693, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.764, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.737, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.839, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.783, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.634, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.533, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.805, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.827, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.338, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.702, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.790, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.824, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.725, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.810, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.681, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.692, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.713, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.804, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.835, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.591, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.495, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.924, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.833, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.946, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.997, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.755, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.828, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.840, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.710, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.054, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.051, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.789, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.129, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.694, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 1.139, but max_gradient 
of the
Shutdown Warning: The maximum gradient found was 0.849, but max_gradient 
of the

The rendered image seems in no way affected by this minor message
mystery. I just wanted it to be mentioned.

The povray version used is 3.6.1 compiled with gcc 3.3.5
(Debian sarge/stable).

Regards,
Sebastian


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From: Thorsten Froehlich
Subject: Re: Isosurface warning message
Date: 30 Jan 2006 10:11:07
Message: <43de2c8b$1@news.povray.org>
Sebastian H. wrote:
> Great, reducing the warning level helps. Thank you very much.
> Now I redirect all message streams to separate files respectively.
> But the "lower max_gradient" messages definitely end up in the fatal
> message file. So are they warnings or fatals or may this even be a bug?

This is indeed a bug in POV-Ray 3.6. It turns out that all messages that 
report a filename/location _after_ parsing send their warnings to the error 
message queue rather than the warning message queue, and consequently they 
appear in the fatal/error stream rather than the warning stream where they 
should be. This only concerns warning messages reporting a filename/location 
_after_ parsing, which I think are (in 3.6) only isosurface max_gradient 
warnings.

> There's another curiosity. The first fatal message in the fatal message 
> file mentions a max_gradient of 10.850 found whereas the
> max_gradient should have had been set to 13.000. But the greatest 
> max_gradient value to be found set in the whole scene is 5.0.

The max_gradient found depends on the pixels traced. The same is true for 
the suggested max_gradient. It is only an estimate based on the pixels 
traced, and usually not the real maximum gradient of the isosurface. As 
such, it will be different if you trace different subsections of the same 
isosurface.

	Thorsten


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From: Sebastian H 
Subject: Re: Isosurface warning message
Date: 31 Jan 2006 11:02:51
Message: <43df8a2b@news.povray.org>
Thorsten Froehlich wrote:
> Sebastian H. wrote:
> 
>> Great, reducing the warning level helps. Thank you very much.
>> Now I redirect all message streams to separate files respectively.
>> But the "lower max_gradient" messages definitely end up in the fatal
>> message file. So are they warnings or fatals or may this even be a bug?
> 
> 
> This is indeed a bug in POV-Ray 3.6. It turns out that all messages that 
> report a filename/location _after_ parsing send their warnings to the 
> error message queue rather than the warning message queue, and 
> consequently they appear in the fatal/error stream rather than the 
> warning stream where they should be. This only concerns warning messages 
> reporting a filename/location _after_ parsing, which I think are (in 
> 3.6) only isosurface max_gradient warnings.
> 
>> There's another curiosity. The first fatal message in the fatal 
>> message file mentions a max_gradient of 10.850 found whereas the
>> max_gradient should have had been set to 13.000. But the greatest 
>> max_gradient value to be found set in the whole scene is 5.0.
> 
> 
> The max_gradient found depends on the pixels traced. The same is true 
> for the suggested max_gradient. It is only an estimate based on the 
> pixels traced, and usually not the real maximum gradient of the 
> isosurface. As such, it will be different if you trace different 
> subsections of the same isosurface.
> 
>     Thorsten

Ok. Thank you for your reply.

Sebastian


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