POV-Ray : Newsgroups : povray.general : default media setting inconsistancies (?) Server Time
1 Nov 2024 05:20:59 EDT (-0400)
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From: Abe
Subject: default media setting inconsistancies (?)
Date: 27 Dec 2004 18:02:39
Message: <41d0948f@news.povray.org>
The docs give the default media settings (relevant to this post) as:

method 3
intervals 10
samples 1,1

This would apparently not take advantage of the adaptive sampling 
available under method 3, since this is only performed when the minimum 
samples value is set at 3 or greater.

Having adaptive sampling "turned off" by default because the default 
samples values are set to a minimum might make sense in terms of 
consistency if the intervals value was set to a minimum as well. 
However, it is clearly not and furthermore in apparent contradiction to 
the recommended interval setting for method 3.

I am particularly puzzled about this. While it seems obviously 
inconsistent to me, I have been unable to find any relevant discussions 
or questions on the pov newsgroups (yet).

Could someone clarify or corroborate?

Abe


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From: Slime
Subject: Re: default media setting inconsistancies (?)
Date: 27 Dec 2004 22:52:26
Message: <41d0d87a@news.povray.org>
> samples 1,1


I think that's only the default for sampling method 1. I think that the
default for method 3 is 5 samples, but I forget where I heard or inferred
that.

Also, the default number of intervals for method 3 is, I think, 1.

 - Slime
 [ http://www.slimeland.com/ ]


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From: Abe
Subject: Re: default media setting inconsistancies (?)
Date: 29 Dec 2004 06:05:01
Message: <web.41d28e9bdcc4986e1207a8fc0@news.povray.org>
"Slime" <fak### [at] emailaddress> wrote:
> > samples 1,1
>
>
> I think that's only the default for sampling method 1. I think that the
> default for method 3 is 5 samples, but I forget where I heard or inferred
> that.
>
> Also, the default number of intervals for method 3 is, I think, 1.
>
>  - Slime
>  [ http://www.slimeland.com/ ]

What you say would certainly make sense, in which case the documentation on
that part would be flat wrong/incomplete. However, I'm not completely
convinced that this is the case (without examining the code). In particular
I believe that I have experienced rendering differences when depending on
the default number of intervals and explicitly setting intervals to 1. I
should probably cook up a test scene to support this.

Abe


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From: Slime
Subject: Re: default media setting inconsistancies (?)
Date: 29 Dec 2004 21:25:35
Message: <41d3671f$1@news.povray.org>
> What you say would certainly make sense, in which case the documentation
on
> that part would be flat wrong/incomplete.

That particular section of the documentation is poorly put together, in my
opinion. The reason for this is that the first part (before the "Note") was
what the section contained in POV-Ray 3.1, and then in POV-Ray 3.5 the rest
was added. This causes people to think that a lot of the details which
actually pertain only to method 1 also pertain to methods 2 and 3. It
probably should have been rewritten when different methods were introduced
to avoid this confusion.

 - Slime
 [ http://www.slimeland.com/ ]


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