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
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
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>
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>>>
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.
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
