POV-Ray : Newsgroups : povray.binaries.images : POVghanistan/POVEarth: now with Melody's smooth triangles macros! : Re: POVghanistan/POVEarth: now with Melody's smooth triangles macros! Server Time: 30 Mar 2020 14:29:15 GMT
  Re: POVghanistan/POVEarth: now with Melody's smooth triangles macros!  
From: Melody
Date: 6 Dec 2019 21:15:00
=?UTF-8?Q?J=c3=b6rg_=22Yadgar=22_Bleimann?= <yaz### [at] gmxde> wrote:
> Hi(gh)!
>
> I succeeded in implementing Melody's macros to my POVEarth/POVghanistan
> script, so I can provide you with a first test rendering... but as
> generating smooth triangles and consecutively entire mesh2 objects
> entirely with POV-Ray SDL is abysmally sloooooooooow, I had to scale the
> altitude data resolution from originally 3600 by 3600 down to 100 by 100
> measuring points - and even this took 37 minutes. Generating the mesh2
> in the original resolution would take a whopping 33.3 days!
>
> This has to be accelerated, of course - and I'll do this by converting
> both Melody's code for generating the normals and my code for generating
> the mesh2 object to C or C++. When this works, I'll start generating
> pre-calculated mesh2s from ASTER ASCII data tiles for the whole land
> surface of Earth and provide them for download on my webspace! So
> finally after 14 years (remember my posting from September 11, 2005?),
> the POVEarth project starts to gain momentum...
>
> See you in Khyberspace!
>
> Yadgar

ay cool. and learned something. I suspected like a billion points or something
... heh 33.days.

Hawaii was only 14 height_fields, setup internally took 10 secs.
14 1201x1201 tga images -
found DEMs of the world abysmally lacking, when supposedly we have 3.4 meters
data ... now that has to be ... ever calculate it? a lot of data!

I saw compiled .hgt files,  it seems the DEM project is outdated, but still
lives.

https://gis.stackexchange.com/questions/43743/extracting-elevation-from-hgt-file

yes,
loops in script too slow? compile with code::blocks.


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