POV-Ray: Newsgroups: povray.beta-test: 3.7b1: Area Lights: Unusual Artifacts

POV-Ray : Newsgroups : povray.beta-test : 3.7b1: Area Lights: Unusual Artifacts		Server Time 29 Jul 2024 06:27:47 EDT (-0400)

From: Mike Raiford
Subject: 3.7b1: Area Lights: Unusual Artifacts
Date: 18 Apr 2005 09:42:11
Message: <4263b933$1@news.povray.org>

When rendering scenes that contain area lights, I've noticed they tend 
to have very unusual artifacts, Just take a look at any of the area 
light demos to see what I mean.

-- 
~Mike

Things! Billions of them!

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From: Lance Birch
Subject: Re: 3.7b1: Area Lights: Unusual Artifacts
Date: 18 Apr 2005 09:45:45
Message: <4263ba09$1@news.povray.org>

"Mike Raiford" <mra### [at] hotmailcom> wrote in message
news:4263b933$1@news.povray.org...
> When rendering scenes that contain area lights, I've noticed they tend
> to have very unusual artifacts, Just take a look at any of the area
> light demos to see what I mean.

Do you mean things like triangles?

I just noticed something similar.  I have a series of spheres and there were
triangle-shaped artifacts in the shadows.  I'll see if I can make a reduced
test-case.

Lance.

thezone - thezone.firewave.com.au

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From: Thorsten Froehlich
Subject: Re: 3.7b1: Area Lights: Unusual Artifacts
Date: 18 Apr 2005 09:59:03
Message: <4263bd27$1@news.povray.org>

Lance Birch wrote:
> Do you mean things like triangles?
> 
> I just noticed something similar.  I have a series of spheres and there were
> triangle-shaped artifacts in the shadows.  I'll see if I can make a reduced
> test-case.

They aren't usually triangles.  Please check if they start at some block 
border.  If so, please also supply the image size you used together with the 
scene as it could be essential to quickly reproduce the problem.

	Thorsten

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From: Mike Raiford
Subject: Re: 3.7b1: Area Lights: Unusual Artifacts
Date: 18 Apr 2005 10:00:07
Message: <4263bd67$1@news.povray.org>

Thorsten Froehlich wrote:
> Lance Birch wrote:
> 
>> Do you mean things like triangles?
>>
>> I just noticed something similar.  I have a series of spheres and 
>> there were
>> triangle-shaped artifacts in the shadows.  I'll see if I can make a 
>> reduced
>> test-case.
> 
> 
> They aren't usually triangles.  Please check if they start at some block 
> border.  If so, please also supply the image size you used together with 
> the scene as it could be essential to quickly reproduce the problem.
> 
>     Thorsten

Sorry... Image was rendered @640x480/no AA.

-- 
~Mike

Things! Billions of them!

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From: Thorsten Froehlich
Subject: Re: 3.7b1: Area Lights: Unusual Artifacts
Date: 18 Apr 2005 11:53:42
Message: <4263d806@news.povray.org>

Mike Raiford wrote:
> Sorry... Image was rendered @640x480/no AA.

I need a minimal scene, too :-)

	Thorsten

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From: Mike Raiford
Subject: Re: 3.7b1: Area Lights: Unusual Artifacts
Date: 18 Apr 2005 13:40:25
Message: <4263f109$1@news.povray.org>

Thorsten Froehlich wrote:
> Mike Raiford wrote:
> 
>> Sorry... Image was rendered @640x480/no AA.
> 
> 
> I need a minimal scene, too :-)
> 
>     Thorsten

Try:

arealit1.pov (Any of the arealit demo scenes), alternatively, a very 
simplified demo:

plane { -z, -20
     pigment { rgb .9 }
}

sphere { <20, 0, 0>, 5
     texture {
         pigment { red 1 }
     }
}

light_source {
     <0, 40, -40> color rgb 1
     area_light <8, 0, 0>, <0, 8, 0>, 17, 17
     adaptive 0
}

camera {
     location <0, -15, -120>
     direction 2*z
     look_at <0, -15, 0>
}




-- 
~Mike

Things! Billions of them!

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