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I just rendered the following scene and noticed that no antialiasing
appears around the shadow edges, despite having the feature turned on.
There does seem to be antialiasing going on where the objects meet the
background though. Is this a bug?
--
http://isometricland.com
Post a reply to this message
Attachments:
Download 'gh_scene_buildingstrip_curve.png' (13 KB)
Preview of image 'gh_scene_buildingstrip_curve.png'
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"SharkD" <pos### [at] gmail com> schreef in bericht
news:4c1d5436@news.povray.org...
>I just rendered the following scene and noticed that no antialiasing
> appears around the shadow edges, despite having the feature turned on.
> There does seem to be antialiasing going on where the objects meet the
> background though. Is this a bug?
>
IIrc, high-contrast edges are more difficult to aa. What is you aa value? In
this case you might need +a0.1 or even +a0.01
Thomas
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On 6/20/2010 3:42 AM, Thomas de Groot wrote:
> "SharkD"<pos### [at] gmailcom> schreef in bericht
> news:4c1d5436@news.povray.org...
>> I just rendered the following scene and noticed that no antialiasing
>> appears around the shadow edges, despite having the feature turned on.
>> There does seem to be antialiasing going on where the objects meet the
>> background though. Is this a bug?
>>
>
> IIrc, high-contrast edges are more difficult to aa. What is you aa value? In
> this case you might need +a0.1 or even +a0.01
>
> Thomas
>
>
I'm using AA 0.3. I guess if there's a good reason then there's no real
problem.
--
http://isometricland.com
Post a reply to this message
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Am 20.06.2010 01:35, schrieb SharkD:
> I just rendered the following scene and noticed that no antialiasing
> appears around the shadow edges, despite having the feature turned on.
> There does seem to be antialiasing going on where the objects meet the
> background though. Is this a bug?
No, it's just the way AA currently works.
In POV-Ray 3.6 with assumed_gamma 1.0, and POV-Ray 3.7 until beta 37a,
AA is based on linear brightness differences; however, the perception of
aliased details follows quite non-linear rules. As a result, you either
get visible aliasing artifacts at edges between moderately-dark and
very-dark areas, or waste a lot of time "over-anti-aliasing" edges
between moderately-bright and very-bright areas.
Future versions of POV-Ray will therefore use a non-linear
(gamma-law-based) threshold for anti-aliasing.
(Earlier versions of POV-Ray, as well as POV-Ray 3.6 with assumed_gamma
2.0, also effectively used a gamma-law-based anti-aliasing threshold and
were therefore less prone to such artifacts, but this was just a side
effect of the absent gamma handling.)
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"clipka" <ano### [at] anonymousorg> schreef in bericht
news:4c1e36db$1@news.povray.org...
> Future versions of POV-Ray will therefore use a non-linear
> (gamma-law-based) threshold for anti-aliasing.
including version 3.7?
Thomas
Post a reply to this message
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Am 21.06.2010 10:01, schrieb Thomas de Groot:
> "clipka"<ano### [at] anonymousorg> schreef in bericht
> news:4c1e36db$1@news.povray.org...
>> Future versions of POV-Ray will therefore use a non-linear
>> (gamma-law-based) threshold for anti-aliasing.
>
> including version 3.7?
including next beta, actually.
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"clipka" <ano### [at] anonymousorg> schreef in bericht
news:4c1f588d$1@news.povray.org...
> Am 21.06.2010 10:01, schrieb Thomas de Groot:
>> "clipka"<ano### [at] anonymousorg> schreef in bericht
>> news:4c1e36db$1@news.povray.org...
>>> Future versions of POV-Ray will therefore use a non-linear
>>> (gamma-law-based) threshold for anti-aliasing.
>>
>> including version 3.7?
>
> including next beta, actually.
Excellent! You guys are fantastic, and no joke.
Keep up the good work!
Thomas
Post a reply to this message
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Le 2010-06-19 19:35, SharkD a écrit :
> I just rendered the following scene and noticed that no antialiasing
> appears around the shadow edges, despite having the feature turned on.
> There does seem to be antialiasing going on where the objects meet the
> background though. Is this a bug?
>
>
Dark green against black.
Maybe you don't have enough contrast for the antialiasing to kick off.
If the red and blue are zero and the green less than 0.3, then you stay
under the aa threshold.
Alain
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