Kirk Andrews wrote:
> This has been done many times--in fact, not so long ago someone was 
> using some rather advanced techniques with very nice results, but I 
> couldn't find the post or remember who was doing it.  In any case, I was 
> inspired last night to make a POV planet, and here it is.  I'm fond of 
> the atmosphere and the water, but I should keep working on the texture 
> for the landmasses.
> 
> ------------------------------------------------------------------------
> 

Wow,,, nice

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Thanks for the nice comments.  Here's another, larger render.  This one 
I rendered with beta 35, and the media seems to have rendered quite 
substantially different.  I had to do some post-processing to make up 
for it.

In case you were curious, the land forms are an isosurface based on 
F_ridged; the ocean is a transparent sphere with colored fade statements 
in the interior.  I used two separate spheres with media--one for 
general atmosphere and another for clouds.

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Attachments:
Download 'blueplanet2.jpg' (114 KB)

Preview of image 'blueplanet2.jpg'

"Kirk Andrews" <kir### [at] tektonartcom> schrieb im Newsbeitrag 
news:4b96ae73@news.povray.org...
> Thanks for the nice comments.  Here's another, larger render.  This one
> I rendered with beta 35, and the media seems to have rendered quite
> substantially different.  I had to do some post-processing to make up
> for it.

The dark side of the planet in this render features a few lights. Are these 
city-lights (intentionally placed) or stars from the background shining 
through or artifacts (from beta)?

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TC wrote:
> "Kirk Andrews" <kir### [at] tektonartcom> schrieb im Newsbeitrag 
> news:4b96ae73@news.povray.org...
>> Thanks for the nice comments.  Here's another, larger render.  This one
>> I rendered with beta 35, and the media seems to have rendered quite
>> substantially different.  I had to do some post-processing to make up
>> for it.
> 
> The dark side of the planet in this render features a few lights. Are these 
> city-lights (intentionally placed) or stars from the background shining 
> through or artifacts (from beta)?
> 
> 
> 
Ah yes, I forgot to mention that.  The render did show some artifacts on 
the landmasses on the dark side of the planet.  However, their placement 
seemed realistic enough to serve as city-lights, so I boosted their 
brightness and blurred them slightly in post-processing.

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On 09/03/2010 20:24, Kirk Andrews wrote:
> Thanks for the nice comments.  Here's another, larger render.  This one
> I rendered with beta 35, and the media seems to have rendered quite
> substantially different. I had to do some post-processing to make up for
> it.
>
> In case you were curious, the land forms are an isosurface based on
> F_ridged; the ocean is a transparent sphere with colored fade statements
> in the interior. I used two separate spheres with media--one for general
> atmosphere and another for clouds.

Any chance of posting the code?  This is something I have played with a 
few times but never got this good a result.

Rarius

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On Tue, 09 Mar 2010 22:24:03 +0200, Kirk Andrews  
<kir### [at] tektonartcom> wrote:

> Thanks for the nice comments.  Here's another, larger render.  This one
> I rendered with beta 35, and the media seems to have rendered quite
> substantially different.  I had to do some post-processing to make up
> for it.
>
I had to change a lot in my media statements when changing from 3.6 to 3.7  
beta, but it looked better in the end :)

-Nekar Xenos-

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On Wed, 10 Mar 2010 00:15:20 +0200, Kirk Andrews  
<kir### [at] tektonartcom> wrote:

> TC wrote:
>> "Kirk Andrews" <kir### [at] tektonartcom> schrieb im Newsbeitrag  
>> news:4b96ae73@news.povray.org...
>>> Thanks for the nice comments.  Here's another, larger render.  This one
>>> I rendered with beta 35, and the media seems to have rendered quite
>>> substantially different.  I had to do some post-processing to make up
>>> for it.
>>  The dark side of the planet in this render features a few lights. Are  
>> these city-lights (intentionally placed) or stars from the background  
>> shining through or artifacts (from beta)?
>>
> Ah yes, I forgot to mention that.  The render did show some artifacts on  
> the landmasses on the dark side of the planet.  However, their placement  
> seemed realistic enough to serve as city-lights, so I boosted their  
> brightness and blurred them slightly in post-processing.

You could also just put a smaller black sphere inside to stop anything  
 from shining through. Did you try playing around with the isosurface  
accuracy setting?

-Nekar Xenos-

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> You could also just put a smaller black sphere inside to stop anything 
> from shining through. Did you try playing around with the isosurface 
> accuracy setting?
> 
> -Nekar Xenos-

An inner sphere is a good idea which would probably fix it.  I did have 
to boost the accuracy setting 1000 fold already just to prevent the 
coastlines from showing up black, for some reason.

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High!

Kirk Andrews wrote:
 > Thanks for the nice comments.  Here's another, larger render.  This 
one I rendered with beta 35, and the media seems to have rendered quite 
substantially different.  I had to do some post-processing to make up 
for it.
 >
 > In case you were curious, the land forms are an isosurface based on 
F_ridged; the ocean is a transparent sphere with colored fade statements 
in the interior.  I used two separate spheres with media--one for 
general atmosphere and another for clouds.
 >

Awesome... how did you use F_ridged? Could you render a surface close-up 
(with the camera located a few meters above the surface looking towards 
the horizon) of one of your continents?

Coincidentally, I currently also work on a planet, and my isosurface 
consists of a blend of granite, spherical and crackle:

#declare S = // for the basic spherical shape
function { x*x + y*y + z*z -1 }

#declare P_Average =
pigment
{
   average
   pigment_map
   {
     [0.5 granite scale 10 poly_wave 0.333 ]
     [1 spherical scale 10 turbulence 0.5 poly_wave 0.333 ]
     [0.025 crackle scale 0.2 turbulence 1 ]
   }
}

#declare Terrain_Part4_Function=
function
{
   pigment { P_Average }
}

overlain with bozo for large-scale altitude variation:

#declare Terrain_Part2_Function=
function
{
   pattern
   {
     bozo
   }
}

#declare Terrain_Function=
function { S(x, y, z) + Terrain_Part4_Function (x*50, y*50, 
z*50).gray*0.05 + Terrain_Part2_Function (x, y, z)*0.01 }

The altitudes range between about -7 and 30 kms (relative to sea 
level)... but the shores of the scattered small "seas" are mostly very 
steep (see images below) - I would preferably have more flat low-lying 
lands around the "seas"! How can this be achieved?

Perhaps we could join forces in building our worlds...

See you in Khyberspace!

Yadgar

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Attachments:
Download '2010-03-15 ghurghusht, glatzer lacus region from 8000 km altitude, lookingdown, take 1.jpg' (177 KB) Download '2010-03-16 ghurghusht, schmidt lacus, achakzai peninsula from 1.7 m altitude,looking southeast, take 1.jpg' (17 KB)

Preview of image '2010-03-15 ghurghusht, glatzer lacus region from 8000 km altitude, lookingdown, take 1.jpg'

Preview of image '2010-03-16 ghurghusht, schmidt lacus, achakzai peninsula from 1.7 m altitude,looking southeast, take 1.jpg'

Rarius wrote:
> On 09/03/2010 20:24, Kirk Andrews wrote:
>> Thanks for the nice comments.  Here's another, larger render.  This one
>> I rendered with beta 35, and the media seems to have rendered quite
>> substantially different. I had to do some post-processing to make up for
>> it.
>>
>> In case you were curious, the land forms are an isosurface based on
>> F_ridged; the ocean is a transparent sphere with colored fade statements
>> in the interior. I used two separate spheres with media--one for general
>> atmosphere and another for clouds.
> 
> Any chance of posting the code?  This is something I have played with a 
> few times but never got this good a result.
> 
> Rarius

Sure, I've put it up on my website here:  http://www.tektonart.com/?p=170

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