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A project I'm working on requires me to get up close to the rings of
Saturn.... but they look like this... is there any way around this besides
setting Anti-Alias to 0.0 AND using AM2 ? Using those 2 increases
rendering time x 50 which is a project-killer.
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From: "Jérôme M. Berger"
Subject: Re: Up close and personal to beautiful celestial body - help
Date: 24 Dec 2006 04:04:49
Message: <458e42b1$1@news.povray.org>
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EagleSun wrote:
> A project I'm working on requires me to get up close to the rings of
> Saturn.... but they look like this... is there any way around this besides
> setting Anti-Alias to 0.0 AND using AM2 ? Using those 2 increases
> rendering time x 50 which is a project-killer.
>
Render at higher resolution and downscale with a decent paint program.
Jerome
- --
+------------------------- Jerome M. BERGER ---------------------+
| mailto:jeb### [at] free fr | ICQ: 238062172 |
| http://jeberger.free.fr/ | Jabber: jeb### [at] jabber fr |
+---------------------------------+------------------------------+
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From: EagleSun
Subject: Re: Up close and personal to beautiful celestial body - help
Date: 24 Dec 2006 10:47:12
Message: <458ea100@news.povray.org>
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news:458e42b1$1@news.povray.org...
>
> EagleSun wrote:
>> A project I'm working on requires me to get up close to the rings of
>> Saturn.... but they look like this... is there any way around this
>> besides
>> setting Anti-Alias to 0.0 AND using AM2 ? Using those 2 increases
>> rendering time x 50 which is a project-killer.
>>
> Render at higher resolution and downscale with a decent paint program.
>
> Jerome
I've experimented with that.. rendering one at 1920x1080 then downscaling to
640x360.. I've also tried Gaussian average on 3x3 before and after
downscaling.... it's too much of a loss, and doesn't fully repair the rings.
Here's an A0.0 AM2 sample.
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From: "Jérôme M. Berger"
Subject: Re: Up close and personal to beautiful celestial body - help
Date: 24 Dec 2006 10:54:33
Message: <458ea2b9$1@news.povray.org>
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EagleSun wrote:
> news:458e42b1$1@news.povray.org...
>> EagleSun wrote:
>>> A project I'm working on requires me to get up close to the rings of
>>> Saturn.... but they look like this... is there any way around this
>>> besides
>>> setting Anti-Alias to 0.0 AND using AM2 ? Using those 2 increases
>>> rendering time x 50 which is a project-killer.
>>>
>> Render at higher resolution and downscale with a decent paint program.
>>
>> Jerome
>
> I've experimented with that.. rendering one at 1920x1080 then downscaling to
> 640x360.. I've also tried Gaussian average on 3x3 before and after
> downscaling.... it's too much of a loss, and doesn't fully repair the rings.
>
Don't do it after rescaling, that won't fix anything and you will
lose some sharpness. If you want to apply such a filter, do it
before downscaling.
What software and settings did you use for downscaling?
Jerome
- --
+------------------------- Jerome M. BERGER ---------------------+
| mailto:jeb### [at] free fr | ICQ: 238062172 |
| http://jeberger.free.fr/ | Jabber: jeb### [at] jabber fr |
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From: EagleSun
Subject: Re: Up close and personal to beautiful celestial body - help
Date: 24 Dec 2006 11:40:48
Message: <458ead90@news.povray.org>
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news:458ea2b9$1@news.povray.org...
>> I've experimented with that.. rendering one at 1920x1080 then downscaling
>> to
>> 640x360.. I've also tried Gaussian average on 3x3 before and after
>> downscaling.... it's too much of a loss, and doesn't fully repair the
>> rings.
>>
> Don't do it after rescaling, that won't fix anything and you will
> lose some sharpness. If you want to apply such a filter, do it
> before downscaling.
Yeah... what I meant is .. first I tried averaging -before- downscaling...
and then on another copy, I tried averaging -after- downscaling. Although
the -before- method made better results, it still was not enough.
>
> What software and settings did you use for downscaling?
>
Software is XnView.. Settings is the simple Bilinear method... it's the
simplest, most straight-forward, and doesn't produce the strange wavy jpegy
edge effects that most algorithms do. The algorithm I would prefer is...
interpolation when increasing the size and average when decreasing size...
but I'm still developing it in my graphics projects.
Is there anything I can do in POV-Ray?
Here's a section of code I use... so you can see I use the "disc" object and
use the "onion" function in the object. Is there a function I can use in
this object that will smooth out the rough rings?
#include _ringimage
#local ABdiff=_outer-_inner;
#local Xring=_outer/_nscale;
#local Malpha=_nscale*_inner/_outer;
#local Step=ABdiff*_nscale/(_divisions*_outer);
#local i=1;
#while (i<=_divisions)
object {
disc
{
<0, 0, 0> y, Malpha+(i)*Step, Malpha+(i-1)*Step
pigment
{
onion
colour_map
{
Planet_RingMap(i)
}
}
finish
{
ambient 0
brilliance 1
albedo(_ringalbedo)
}
scale Xring*unitscale
}
hollow on
double_illuminate
}
#local i=i+1;
#end
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