POV-Ray : Newsgroups : povray.animations : Strange flashes from a partial mirror surface Server Time: 23 Oct 2019 02:31:56 GMT
  Strange flashes from a partial mirror surface (Message 1 to 5 of 5)  
From: Roland Mösl
Subject: Strange flashes from a partial mirror surface
Date: 13 May 2011 06:33:00
Message: <4dccd09c$1@news.povray.org>
I just rendered 600 pictures for
an animation.

Flying over a village with big
photovoltaic roofs.

The source for the scnee is at

http://wohnen.pege.org/2011-solares-bauland/pov.zip

With the setings in this file,
picture 316, 364, 450
has complete different color on the roof.

The roof is with a material map

#declare house_t_PV_Unit = texture
{ material_map
   { gif "map-pv.gif"
     texture { house_t_Aluminium }
     texture { house_t_PV_Silizium }
     texture { house_t_PV_Silizium }
     texture { house_t_PV_Silizium }
   }  // material_map
}  // texture

can this be an error in POV?

Roland Mösl


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From: Christian Froeschlin
Subject: Re: Strange flashes from a partial mirror surface
Date: 14 May 2011 02:50:22
Message: <4dcdedee$1@news.povray.org>
> With the setings in this file,
> picture 316, 364, 450
> has complete different color on the roof.

what version are you using? I tried a test
render of all frames in 320x240 No AA with
3.7 RC3 on 64-bit and did not see the effect.

My best guess would be a precision issue somewhere
as your scene uses large distances for the sun/sky.
This doesn't work well together with small
scale modelling.


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From: Roland Mösl
Subject: Re: Strange flashes from a partial mirror surface
Date: 14 May 2011 10:43:06
Message: <4dce5cba$1@news.povray.org>
On 2011-05-14 04:50, Christian Froeschlin wrote:
>
>> With the setings in this file,
>> picture 316, 364, 450
>> has complete different color on the roof.
>
> what version are you using?

3.6.2.msvc9.win64

> I tried a test
> render of all frames in 320x240 No AA with
> 3.7 RC3 on 64-bit and did not see the effect.
>
> My best guess would be a precision issue somewhere
> as your scene uses large distances for the sun/sky.
> This doesn't work well together with small
> scale modelling.

Oh, I just thought about moving the sun
149000000000 away

and to rotate and translate the scene,
that I can simulate sun positions
for every day of the year.


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From: Alain
Subject: Re: Strange flashes from a partial mirror surface
Date: 14 May 2011 18:37:20
Message: <4dcecbe0$1@news.povray.org>
Le 2011/05/14 06:43, Roland Mösl a écrit :
> On 2011-05-14 04:50, Christian Froeschlin wrote:
>>
>>> With the setings in this file,
>>> picture 316, 364, 450
>>> has complete different color on the roof.
>>
>> what version are you using?
>
> 3.6.2.msvc9.win64
>
>> I tried a test
>> render of all frames in 320x240 No AA with
>> 3.7 RC3 on 64-bit and did not see the effect.
>>
>> My best guess would be a precision issue somewhere
>> as your scene uses large distances for the sun/sky.
>> This doesn't work well together with small
>> scale modelling.
>
> Oh, I just thought about moving the sun
> 149000000000 away
>
> and to rotate and translate the scene,
> that I can simulate sun positions
> for every day of the year.
>
>

Place your sun much closer and use the parallel option.


Alan


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From: Roland Mösl
Subject: Re: Strange flashes from a partial mirror surface
Date: 5 Nov 2011 18:42:54
Message: <4eb583ae$1@news.povray.org>
On 2011-05-13 08:32, Roland Mösl wrote:
> I just rendered 600 pictures for
> an animation.
>
> Flying over a village with big
> photovoltaic roofs.
>
> The source for the scnee is at
>
> http://wohnen.pege.org/2011-solares-bauland/pov.zip
>
> With the setings in this file,
> picture 316, 364, 450
> has complete different color on the roof.
>
> The roof is with a material map
>
> #declare house_t_PV_Unit = texture
> { material_map
> { gif "map-pv.gif"
> texture { house_t_Aluminium }
> texture { house_t_PV_Silizium }
> texture { house_t_PV_Silizium }
> texture { house_t_PV_Silizium }
> } // material_map
> } // texture
>
> can this be an error in POV?

The failure was in map-pv.gif

In all the pictures had been only
used

color index 0
color index 254

I reduced color depth to 16.
Now had the 2 used colors index 0, 1
and the effect dissappeared

--
Roland Mösl


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