Am 31.05.2011 20:30, schrieb Anthony D. Baye:
> "Thomas de Groot"<tDOTdegroot@interDOTnlANOTHERDOTnet>  wrote:
>> Nice.
>>
>> I am still surprised at the render time. My planets with the given *Tek
>> atmosphere*, render in less than an hour....
>>
>> Thomas
>
> I'm going to guess that your planets are all unit spheres, or not much bigger.

Note that absolute scale doesn't affect render time.

> My planet has a radius of 63730 units: 1 unit = 100m, the atmosphere is 1000
> units - 100 scale km - thick (density varies appropriately, 99% is below 36km,
> 50% is below 5.5km).  I'm not terribly concerned about the render time, although
> it would be impossible to animate.

With a density distribution like that, you'll probably be able to reduce 
your render time by clipping the atmosphere at 36 km or even less 
without any noticeable impact (except for a good deal of render speedup 
:-)).

> As for it being flat and textureless: It isn't.  The planet is a combination of
> isosurfaces, one for land, one for ocean, and the water is my best water texture
> yet (although I did remove the dispersion).

Uh... given the scales you are using, are you sure you need the 
isosurfaces? I guess a bump map should do the job just as well.

> So, maybe it's a bit overkill, but I like it.

Heh, yeah. I know that feeling :-)

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"RobF" <nomail@nomail> wrote in message 
news:web.4de47962d55febdd7ab7c0b80@news.povray.org...
> Hi Anthony,
>
> Since your planet is far away, you may also want to consider using the aoi
> pattern to fake an atmospheric glow. Although it doesn't give that 
> soft/hazy
> look, it renders very fast.  Here's a code snippet and an example of what 
> it
> looks like (with the USS Enterprise, of course! :-)
>
> #declare p_planet_atmosphere =
>      pigment {rgbt <0.5,0.5,0.5,0.5>}; // adjust transparancy component to
> change atmospheric translucency
>
> #declare p_planet_atmosphere_glow =
>    pigment {rgb <0.9,0.95,1>*1.8}; // atmospheric glow
>
> #declare p_planet_atmosphere =
> pigment {
>  aoi
>  pigment_map {
>  [0.5 p_planet_atmosphere_glow]
>  [0.7 p_planet_atmosphere]
>  }
> };
>
> #declare t_planet_atmosphere =
>      texture {pigment {p_planet_atmosphere}
>              finish {ambient 0}
>      }
>    union {
>      sphere {0,3   texture {T_Stone22  finish {phong 0 ambient 0 
> reflection 0}}
> }  // planet surface
>      sphere {0,3.0001 texture {t_planet_atmosphere}}
>   // planet atmosphere
>     }
>
> // need a bright light to make it glow
>
> ---
> Rob.
> Rob Fitzel
> www.fitzel.ca/dart
>
>
>

That background media looks amazing!  Is there any chance you could share 
that code snippet too?  I've been struggling getting a nice looking cloud 
like that.

Thanks!

Cheers Dre

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>
> That background media looks amazing!  Is there any chance you could share
> that code snippet too?  I've been struggling getting a nice looking cloud
> like that.
>
> Thanks!
>
> Cheers Dre

Thanks for the feedback.
I've posted a prototype of my Space Scene Generator in povray.text.scene-files

It should draw the same background as my sample image. The nebulae are built-in
stone/granite textures mapped onto a couple of concentric sphere centered on the
camera.

All the elements in that scene are controlled by random seeds. It took more than
a few tries before I got a nebula that I liked! See the comments in the scene
file to learn how to modify the random seeds. It renders very quickly, so I
usually base the main randomizer on "clock" to render dozens of completely
different random scenes.

Cheers,

Rob.
---
Rob Fitzel
www.fitzel.ca/dart

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"Anthony D. Baye" <Sha### [at] spamnomorehotmailcom> wrote:
> As for it being flat and textureless: It isn't.

Well, it *looks* flat and textureless. And that's what it comes down to after
all, isn't it?

> The planet is a combination of
> isosurfaces, one for land, one for ocean, and the water is my best water texture
> yet (although I did remove the dispersion).

Isosorfaces for the planet? Seriously?

If you enjoy waiting 14+ hours for a render that *looks* like a 30 seconds
render: Go ahead! :D

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"Anthony D. Baye" <Sha### [at] spamnomorehotmailcom> schreef in bericht 
news:web.4de533c3d55febdd9c4fb0ad0@news.povray.org...
> As for it being flat and textureless: It isn't.  The planet is a 
> combination of
> isosurfaces, one for land, one for ocean, and the water is my best water 
> texture
> yet (although I did remove the dispersion).
>
> So, maybe it's a bit overkill, but I like it.
>

Yes it is overkill. I would suggest using a spherical height_field (which I 
use) if you really want some relief to show.

Thomas

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"Zeger Knaepen" <zeg### [at] povplacecom> schreef in bericht 
news:4de5104e$1@news.povray.org...
> (It's the technique I used in my Babylon-video)

Excellent code! Thanks for sharing.

Thomas

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"RobF" <nomail@nomail> schreef in bericht 
news:web.4de5d4d4d55febdd7ab7c0b80@news.povray.org...
> I've posted a prototype of my Space Scene Generator in 
> povray.text.scene-files

Great stuff! Competes successfully with ChrisColefax's galaxy.inc.

Keep up the work.

Thomas

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"RobF" <nomail@nomail> wrote in message 
news:web.4de5d4d4d55febdd7ab7c0b80@news.povray.org...
> >
>> That background media looks amazing!  Is there any chance you could share
>> that code snippet too?  I've been struggling getting a nice looking cloud
>> like that.
>>
>> Thanks!
>>
>> Cheers Dre
>
> Thanks for the feedback.
> I've posted a prototype of my Space Scene Generator in 
> povray.text.scene-files
>
> It should draw the same background as my sample image. The nebulae are 
> built-in
> stone/granite textures mapped onto a couple of concentric sphere centered 
> on the
> camera.
>
> All the elements in that scene are controlled by random seeds. It took 
> more than
> a few tries before I got a nebula that I liked! See the comments in the 
> scene
> file to learn how to modify the random seeds. It renders very quickly, so 
> I
> usually base the main randomizer on "clock" to render dozens of completely
> different random scenes.
>
> Cheers,
>
> Rob.
> ---
> Rob Fitzel
> www.fitzel.ca/dart
>
>
>
Thats great, thanks very much!

I'll certainly be playing around with this :)

Cheers Dre

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