POV-Ray : Newsgroups : povray.beta-test : Possible problem with mediasky.pov (beta4) Server Time
23 Oct 2021 17:47:59 EDT (-0400)
  Possible problem with mediasky.pov (beta4) (Message 1 to 4 of 4)  
From: Warp
Subject: Possible problem with mediasky.pov (beta4)
Date: 6 May 2005 19:43:29
Message: <427c0121@news.povray.org>
scenes\advanced\mediasky.pov looks much darker with pov3.7beta4
than with pov3.6. I believe that the difference in brightness
probably can't be attributed to gamma problems in this case because
it is so pronounced (but I might be wrong, actually; the scene uses
assumed_gamma 1, and I have noticed that the more the assumed_gamma
differs from the default, the more different pov3.7beta will render
it...)

  By the way, a minor thing and probably not an issue, but at 320x240
(no aa) pov3.6 takes 1m 20s to render while pov3.7beta4 takes 1m 46s.
Is such a slowdown to be expected?

-- 
                                                          - Warp


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From: Thorsten Froehlich
Subject: Re: Possible problem with mediasky.pov (beta4)
Date: 7 May 2005 10:28:31
Message: <427cd08f$1@news.povray.org>
Warp wrote:
>  gamma problems in this case

There are no "gamma problems", there is simply *no* gamma correction.  As 
such, if you turn *off* gamma correction in 3.6, every image is supposed to 
look the same.  If it does not, that is in most case an error :-)

	Thorsten


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From: Chris Cason
Subject: Re: Possible problem with mediasky.pov (beta4)
Date: 7 May 2005 18:48:46
Message: <427d45ce@news.povray.org>
Warp wrote:
>   scenes\advanced\mediasky.pov looks much darker with pov3.7beta4
> than with pov3.6. I believe that the difference in brightness
> probably can't be attributed to gamma problems in this case because
> it is so pronounced (but I might be wrong, actually; the scene uses
> assumed_gamma 1, and I have noticed that the more the assumed_gamma
> differs from the default, the more different pov3.7beta will render
> it...)

The stats show a number of differences (especially in shadow ray tests) so
there's definitely something going on there.

>   By the way, a minor thing and probably not an issue, but at 320x240
> (no aa) pov3.6 takes 1m 20s to render while pov3.7beta4 takes 1m 46s.
> Is such a slowdown to be expected?

There are some speed issues (it's noted in the announcement). We have more
work to finish in that area.

-- chris


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From: Chris Cason
Subject: Re: Possible problem with mediasky.pov (beta4)
Date: 13 May 2005 05:18:23
Message: <428470df$1@news.povray.org>
Warp wrote:
>   scenes\advanced\mediasky.pov looks much darker with pov3.7beta4
> than with pov3.6. I believe that the difference in brightness
> probably can't be attributed to gamma problems in this case because
> it is so pronounced (but I might be wrong, actually; the scene uses
> assumed_gamma 1, and I have noticed that the more the assumed_gamma
> differs from the default, the more different pov3.7beta will render
> it...)

This is fixed.

thanks,

-- Chris


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