"Hj. Malthaner" <han### [at] nospamgmxde> wrote:
> On 1/8/21 3:26 PM, Mr wrote:
>
> >
http://wiki.povray.org/content/HowTo:Migrate_old_scenes_to_work_with_the_new_gamma_system
> >
> >
> > This will allow you to use and actually take enourmous advantage in such a
> > scene, of inverse power law (new in POV3.8 and the most realistic), for every
> > light :
> > fade_distance 0
> > (requires  #version 3.8 directive at very top of the file)
>
> Took quite some adjustments to light brightness and also some colors,
> The result looks much more natural though. I think the gamma problem was
> what made many of my scenes look strange somehow.
>
> Maybe not the final version, but to show the difference I've attached
> the version with assumed_gamma 1.0, file and display gamma 2.2
>
> But it looked very bland with those settings so I used the color-curve
> tool in GIMP to enhance the contrast.
>
> --
> Some of my PovRay works:
> https://www.deviantart.com/antarasol/gallery/42758766/3D

What you could use gimp for is to find the corrected color hues to gain back
lost saturation. Did you switch colors to srgb as well? Hue dynamics potential
is much greater. In fact it already shows in both planets, and the main ship
side light projectors.  It's normal the image appears washed out at this stage.
Do not despair ! It's really going to be worth it.

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"Hj. Malthaner" <han### [at] nospamgmxde> wrote:
> On 1/8/21 3:26 PM, Mr wrote:
>
> >
http://wiki.povray.org/content/HowTo:Migrate_old_scenes_to_work_with_the_new_gamma_system
> >
> >
> > This will allow you to use and actually take enourmous advantage in such a
> > scene, of inverse power law (new in POV3.8 and the most realistic), for every
> > light :
> > fade_distance 0
> > (requires  #version 3.8 directive at very top of the file)
>
> Took quite some adjustments to light brightness and also some colors,
> The result looks much more natural though. I think the gamma problem was
> what made many of my scenes look strange somehow.
>
> Maybe not the final version, but to show the difference I've attached
> the version with assumed_gamma 1.0, file and display gamma 2.2
>
> But it looked very bland with those settings so I used the color-curve
> tool in GIMP to enhance the contrast.
>
> --
> Some of my PovRay works:
> https://www.deviantart.com/antarasol/gallery/42758766/3D

a question, a point, and an opinion;

the question is, how did you make the diffraction spikes on the stars, if i may
ask.

the point i want to make is, you can see the shadows of the space station and
two spacecraft on the planet below.  i am pretty sure you do not want that to
happen.

the opinion is, the composition would look nicer if the light source was off to
the side.  the shadows on the space station would be more dramatic, also the two
planets.  crescent moons are more interesting than full moons, i think.  it
would automatically take care of the space station shadow too.

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On 1/11/21 8:57 PM, green wrote:

> a question, a point, and an opinion;
> 
> the question is, how did you make the diffraction spikes on the stars, if i may
> ask.

In this scene I must admit, the stars are a bitmap (image_map).

Meanwhile I have a solution that works fully inside povray but I didn't 
update the scene yet. I've attached an example that uses the real stars. 
It actually places a good number of star shaped objects so that the 
spikes are properly aligned. The star object is simple:

#macro O_PIXIE_STAR_RAY(ELONGATION)
object
{
   Pyramid2
   scale <1, ELONGATION, 1>
}
#end

#macro O_PIXIE_STAR_4(ELONGATION)
union
{
   #local O_STAR_RAY = O_PIXIE_STAR_RAY(ELONGATION)

   #local n = 0;
   #while (n < 4)
     object
     {
       O_STAR_RAY
       rotate <n * 360/4, 0, 0>
     }

     #local n = n + 1;
   #end
}
#end

With a color gradient that fades along the rays so the core is bright 
and the tips are dim, these look quite nice. Povray can handle hundreds 
of them without troubles.

> the point i want to make is, you can see the shadows of the space station and
> two spacecraft on the planet below.  i am pretty sure you do not want that to
> happen.

Yes. But the planet is too close and small ... to get this right I'll 
have to make the planet much bigger and realign planet moon station and 
the flying shuttles. Was too much effort for the old scene, so I just 
tried to move the shadow to a place where it didn't disturb too much.

> the opinion is, the composition would look nicer if the light source was off to
> the side.  the shadows on the space station would be more dramatic, also the two
> planets.  crescent moons are more interesting than full moons, i think.  it
> would automatically take care of the space station shadow too.

I agree. Within the constraints of the scene both sun from left and sun 
from right didn't work well, but in general you are right, the light 
should come more from the side to give stronger contrast between lit and 
shadow sides.

I'll keep this in mind though when I come back to update the scene more.

-- 
Some of my PovRay works:
https://www.deviantart.com/antarasol/gallery/42758766/3D

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Attachments:
Download 'jump_station-v1_9-t.jpg' (465 KB)

Preview of image 'jump_station-v1_9-t.jpg'

On 1/11/21 3:56 PM, Paolo Gibellini wrote:
> Hj. Malthaner wrote on 08/01/2021 01:17:
>> On 1/6/21 10:26 PM, Hj. Malthaner wrote:
>>> Another scene that I dug out from the archive and which I'm trying to 
>>> update now. Most work went into the planet.

> I really like the colors of the whole composition.
> 
> Paolo

Thanks. Some day I'll try to rework the whole scene, try to get rid of 
all the small problems it currently has.

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