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When using a media with settings of:
confidence 0.0
variance 1.0
Beta 2.8 msvc8-sse2 win32
Povray gives an error and stops. The 3.6 help says "POV-Ray will issue a warning
and then use the default instead."
I think that this may be a known problem but I could not find it in p.beta-test
--
Regards
Stephen
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"Stephen" <mcavoysAT@aolDOTcom> wrote in message
news:1818c45uba5iv8h06oemp4qfa9akher6jd@4ax.com...
> When using a media with settings of:
> confidence 0.0
> variance 1.0
After reading this passage in help about these settings I'm confused:
As each interval is sampled, the variance is computed. If the variance is
below a threshold value, then no more samples are needed. The variance and
confidence keywords specify the permitted variance allowed and the
confidence that you are within that variance. The exact calculations are
quite complex and involve chi-squared tests and other statistical principles
too messy to describe here. The default values are variance 1.0/128 and
confidence 0.9. For slower more accurate results, decrease the variance and
increase the confidence.
Why would there ever be a condition where you would use confidence 0.0?
You're saying NO confidence in the media sample. Am I missing something
here?
Jim
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On Mon, 8 Sep 2008 07:44:50 -0300, "Jim Holsenback" <jho### [at] hotmail com>
wrote:
>
>Why would there ever be a condition where you would use confidence 0.0?
>You're saying NO confidence in the media sample. Am I missing something
>here?
Hi Jim,
I was using a material that someone gave me years ago to get started.
These were the values in the material. It works in 3.6 so I reported it not
working in 3.7.
You are right about no one in there right mind would use those values. But then
who says I'm in my right mind? ;)
--
Regards
Stephen
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Jim Holsenback nous illumina en ce 2008-09-08 06:44 -->
> "Stephen" <mcavoysAT@aolDOTcom> wrote in message
> news:1818c45uba5iv8h06oemp4qfa9akher6jd@4ax.com...
>> When using a media with settings of:
>> confidence 0.0
>> variance 1.0
>
> After reading this passage in help about these settings I'm confused:
> As each interval is sampled, the variance is computed. If the variance is
> below a threshold value, then no more samples are needed. The variance and
> confidence keywords specify the permitted variance allowed and the
> confidence that you are within that variance. The exact calculations are
> quite complex and involve chi-squared tests and other statistical principles
> too messy to describe here. The default values are variance 1.0/128 and
> confidence 0.9. For slower more accurate results, decrease the variance and
> increase the confidence.
>
> Why would there ever be a condition where you would use confidence 0.0?
> You're saying NO confidence in the media sample. Am I missing something
> here?
>
> Jim
>
>
You may use a small confidence value for some quick test renders.
You may do an animation varying that value to see it's effect.
You may have set it to zero by error.
--
Alain
-------------------------------------------------
At the feast of ego everyone leaves hungry.
Bentley's House of Coffee and Tea, Tucson, AZ
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Stephen wrote:
> When using a media with settings of:
> confidence 0.0
> variance 1.0
>
> Beta 2.8 msvc8-sse2 win32
>
> Povray gives an error and stops. The 3.6 help says "POV-Ray will issue a warning
> and then use the default instead."
Actually that refers to the variance. Confidence may be legitimately 0 with
no error. However the code (and this is in 3.6 too) doesn't permit 0. I
have fixed this.
-- Chris
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