POV-Ray : Newsgroups : povray.advanced-users : Area light media artifact Server Time
10 May 2021 20:57:46 EDT (-0400)
  Area light media artifact (Message 1 to 6 of 6)  
From: Mike Horvath
Subject: Area light media artifact
Date: 10 Jan 2021 04:07:18
Message: <5ffac3c6$1@news.povray.org>
I have a space ship orbiting a planet in my scene. The space ship has an 
area light in it that is visible from outside the ship through a window.

The planet has a thin atmosphere using scattering and emission media.

The combination of the two causes about half the planet to appear 
completely bright white. Changing the max_trace_level seems to have no 
effect.

Is this a precision issue? Is there a way to fix this? Thanks.


Michael


Post a reply to this message

From: Mike Horvath
Subject: Re: Area light media artifact
Date: 10 Jan 2021 04:14:26
Message: <5ffac572$1@news.povray.org>
I think this actually has to do with the isosurface of the planet. I 
will continue to investigate.

Mike


On 1/10/2021 4:07 AM, Mike Horvath wrote:
> I have a space ship orbiting a planet in my scene. The space ship has an 
> area light in it that is visible from outside the ship through a window.
> 
> The planet has a thin atmosphere using scattering and emission media.
> 
> The combination of the two causes about half the planet to appear 
> completely bright white. Changing the max_trace_level seems to have no 
> effect.
> 
> Is this a precision issue? Is there a way to fix this? Thanks.
> 
> 
> Michael


Post a reply to this message

From: Mike Horvath
Subject: Re: Area light media artifact
Date: 10 Jan 2021 04:59:08
Message: <5ffacfec$1@news.povray.org>
It is not due to the isosurface. It is just the thin atmosphere.


Mike



On 1/10/2021 4:14 AM, Mike Horvath wrote:
> I think this actually has to do with the isosurface of the planet. I 
> will continue to investigate.
> 
> Mike
> 
> 
> On 1/10/2021 4:07 AM, Mike Horvath wrote:
>> I have a space ship orbiting a planet in my scene. The space ship has 
>> an area light in it that is visible from outside the ship through a 
>> window.
>>
>> The planet has a thin atmosphere using scattering and emission media.
>>
>> The combination of the two causes about half the planet to appear 
>> completely bright white. Changing the max_trace_level seems to have no 
>> effect.
>>
>> Is this a precision issue? Is there a way to fix this? Thanks.
>>
>>
>> Michael
>


Post a reply to this message

From: Mike Horvath
Subject: Re: Area light media artifact
Date: 10 Jan 2021 05:21:03
Message: <5ffad50f$1@news.povray.org>
Turning on adaptive sampling seems to have fixed the artifacts.


Mike



On 1/10/2021 4:59 AM, Mike Horvath wrote:
> It is not due to the isosurface. It is just the thin atmosphere.
> 
> 
> Mike
> 
> 
> 
> On 1/10/2021 4:14 AM, Mike Horvath wrote:
>> I think this actually has to do with the isosurface of the planet. I 
>> will continue to investigate.
>>
>> Mike
>>
>>
>> On 1/10/2021 4:07 AM, Mike Horvath wrote:
>>> I have a space ship orbiting a planet in my scene. The space ship has 
>>> an area light in it that is visible from outside the ship through a 
>>> window.
>>>
>>> The planet has a thin atmosphere using scattering and emission media.
>>>
>>> The combination of the two causes about half the planet to appear 
>>> completely bright white. Changing the max_trace_level seems to have 
>>> no effect.
>>>
>>> Is this a precision issue? Is there a way to fix this? Thanks.
>>>
>>>
>>> Michael
>>
>


Post a reply to this message

From: Alain Martel
Subject: Re: Area light media artifact
Date: 11 Jan 2021 19:35:56
Message: <5ffceeec$1@news.povray.org>
Le 2021-01-10 à 04:07, Mike Horvath a écrit :
> I have a space ship orbiting a planet in my scene. The space ship has an 
> area light in it that is visible from outside the ship through a window.
> 
> The planet has a thin atmosphere using scattering and emission media.
> 
> The combination of the two causes about half the planet to appear 
> completely bright white. Changing the max_trace_level seems to have no 
> effect.
> 
> Is this a precision issue? Is there a way to fix this? Thanks.
> 
> 
> Michael

The first thing that I would do would be to use light fading for any 
light associated with the ship.


Post a reply to this message

From: Mike Horvath
Subject: Re: Area light media artifact
Date: 26 Jan 2021 03:55:53
Message: <600fd919$1@news.povray.org>
On 1/11/2021 7:35 PM, Alain Martel wrote:
> The first thing that I would do would be to use light fading for any 
> light associated with the ship.
> 
> 

Yes, it has a fade distance and fade power.

In my scene there was also a polygon with a bitmap texture. Where it 
overlapped the planet I had the same problem. The workaround was to make 
the polygon smaller and move it so that it no longer covered the planet.


Mike


Post a reply to this message

Copyright 2003-2021 Persistence of Vision Raytracer Pty. Ltd.