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2 Nov 2024 18:50:33 EDT (-0400)
  Landscape tinkering (Message 1 to 7 of 7)  
From: Smws
Subject: Landscape tinkering
Date: 10 Feb 2010 12:05:00
Message: <web.4b72e697fa96b794b1680dd30@news.povray.org>
I have been lurking on these newsgroups for a little while now, and since I have
been raytracing again I thought I would post something.

I've been working with pseudorandom landscape generation --seemingly a phase
many people go through :) and here is one of the more interesting landscapes
that I have come across so far. Sorry for the very boring texture, no other
objects, etc.

function pattern dents - function pattern granite

Cheers!


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Attachments:
Download 'landscape testwip21.jpg' (78 KB)

Preview of image 'landscape testwip21.jpg'
landscape testwip21.jpg


 

From: Paolo Gibellini
Subject: Re: Landscape tinkering
Date: 11 Feb 2010 10:00:53
Message: <4b741ba5@news.povray.org>
A nice startup.
Now, you can populate it with some grass or plants.
;-)
Paolo

 >Smws  on date 10/02/2010 18:02 wrote:
> I have been lurking on these newsgroups for a little while now, and since I have
> been raytracing again I thought I would post something.
> 
> I've been working with pseudorandom landscape generation --seemingly a phase
> many people go through :) and here is one of the more interesting landscapes
> that I have come across so far. Sorry for the very boring texture, no other
> objects, etc.
> 
> function pattern dents - function pattern granite
> 
> Cheers!
> 
> 
> ------------------------------------------------------------------------
>


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From: Jörg 'Yadgar' Bleimann
Subject: Re: Landscape tinkering
Date: 15 Feb 2010 09:38:12
Message: <4b795c54@news.povray.org>
High!

Smws wrote:
> I have been lurking on these newsgroups for a little while now, and since I have
> been raytracing again I thought I would post something.
> 
> I've been working with pseudorandom landscape generation --seemingly a phase
> many people go through :) and here is one of the more interesting landscapes
> that I have come across so far. Sorry for the very boring texture, no other
> objects, etc.
> 
> function pattern dents - function pattern granite

Interesting... as I myself started tinkering with a whole isosurface 
planet, I would like to know how you combined the two functions, i. e. 
what amount and scale for each!

My isosurface landscape (see below) currently is a combination of

x*x + y*y + z*z -1 for overall spherical shape of the planet,
granite, scaled to 10 and using a poly_wave with exponent 0.3333 for the 
mountain ridges, finally
bozo for large-scale variance of elevation

The amount (multiplication factor within the combined isosurface) of 
granite is 0.02, of bozo is 0.01.

Here my code:

#declare Terrain_Part1_Function=
function
{
   pattern
   {
     granite
     scale 10
     poly_wave 0.333
   }
}

#declare Terrain_Part2_Function=
function
{
   pattern
   {
     bozo
   }
}

#declare S =
function { x*x + y*y + z*z -1 }

#declare Ghurghusht =
union
{
   isosurface
   {
     function { S(x, y, z) + Terrain_Part1_Function (x*50, y*50, 
z*50)*0.02 + Terrain_Part2_Function (x, y, z)*0.01 } // f_noise3d 
(x*100, y*100, z*100)*0.007 }
     contained_by { sphere { 0, 1 } }
     max_gradient 10
     accuracy 0.0001
     texture
     {
       pigment { color rgb <0.98, 0.85, 0.45> }
       finish { ambient 0.05 diffuse 1 brilliance 0.98 }
     }
   }
   scale 5178 // radius in kilometres
}

Currently, I have not yet rendered a close-up surface view in 
"pedestrian" perspective (only a close-up of the planet's limb at the 
equator, see last image)... but I think I'll replace that simple granite 
function later on by ridged_mf or a similar more sophicisticated 
function to get wider lowlands at 0 to 200 metres elevation around the 
lakes (see cylindrical map). Then there is also the problem of modelling 
realistic erosion/drainage patterns...

See you in Khyberspace!

Yadgar


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Attachments:
Download '2010-01-24 ghurghusht, lakes hemisphere, take 1.jpg' (180 KB) Download '2010-01-26 ghurghusht, highland hemisphere, take 1.jpg' (146 KB) Download '2010-02-05 cylindrical map of ghurghusht, take 3.png' (935 KB) Download 'ghurghusht0186.png' (348 KB)

Preview of image '2010-01-24 ghurghusht, lakes hemisphere, take 1.jpg'
2010-01-24 ghurghusht, lakes hemisphere, take 1.jpg

Preview of image '2010-01-26 ghurghusht, highland hemisphere, take 1.jpg'
2010-01-26 ghurghusht, highland hemisphere, take 1.jpg

Preview of image '2010-02-05 cylindrical map of ghurghusht, take 3.png'
2010-02-05 cylindrical map of ghurghusht, take 3.png

Preview of image 'ghurghusht0186.png'
ghurghusht0186.png


 

From: andrel
Subject: Re: Landscape tinkering
Date: 16 Feb 2010 11:52:43
Message: <4B7ACD5A.7000500@gmail.com>

> High!
[snip]
For some reason this made me wondering how a planet(oid) would look like 
with

http://upload.wikimedia.org/wikipedia/en/5/51/Cosmic_Background_Imager-_CMB.png

as a hightfield.


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From: Jörg 'Yadgar' Bleimann
Subject: Re: Landscape tinkering
Date: 16 Feb 2010 12:19:36
Message: <4b7ad3a8@news.povray.org>
High!

andrel wrote:

> For some reason this made me wondering how a planet(oid) would look like 
> with
> 
> http://upload.wikimedia.org/wikipedia/en/5/51/Cosmic_Background_Imager-_CMB.png 
> 
> 
> as a hightfield.

Not really good - as the bitmap is neither seamless in the x direction 
nor stretched appropriately towards its upper and lower edge along the x 
direction to match the cylindrical projection! Also, then its x:y ratio 
should be 2:1!

See you in Khyberspace!

Yadgar


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From: andrel
Subject: Re: Landscape tinkering
Date: 16 Feb 2010 14:27:19
Message: <4B7AF195.6060400@gmail.com>

> High!
> 
> andrel wrote:
> 
>> For some reason this made me wondering how a planet(oid) would look 
>> like with
>>
>> http://upload.wikimedia.org/wikipedia/en/5/51/Cosmic_Background_Imager-_CMB.png 
>>
>>
>> as a hightfield.
> 
> Not really good - as the bitmap is neither seamless in the x direction 
> nor stretched appropriately towards its upper and lower edge along the x 
> direction to match the cylindrical projection! Also, then its x:y ratio 
> should be 2:1!

This is only a small part. Obviously the whole thing should be seamless 
and fit on a sphere, because that is how they measured it.


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From: Thomas de Groot
Subject: Re: Landscape tinkering
Date: 17 Feb 2010 04:03:11
Message: <4b7bb0cf$1@news.povray.org>
"andrel" <byt### [at] gmailcom> schreef in bericht 
news:4B7### [at] gmailcom...

>> High!
> [snip]
> For some reason this made me wondering how a planet(oid) would look like 
> with
>
> http://upload.wikimedia.org/wikipedia/en/5/51/Cosmic_Background_Imager-_CMB.png
>
> as a hightfield.


I suppose that the whole cosmic background radiation map would look more or 
less like a height_field using bozo...

Thomas


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