POV-Ray : Newsgroups : povray.binaries.animations : Planetary fly-overs with height-fields Server Time: 28 Nov 2020 14:07:44 GMT
  Planetary fly-overs with height-fields (Message 1 to 4 of 4)  
From: Mätes
Subject: Planetary fly-overs with height-fields
Date: 16 Nov 2020 19:25:07
Message: <web.5fb2d11bbddf5c217c8778c10@news.povray.org>
Hi Povrayer,

2018 I worked with real height-data of planets and tried some fly-over with help
from Povrays height-fields.
Here one of the Moon (Mare Imbrium) and two from Mars (Vallis Marineris and
Olympus Mons).

Videos:
https://www.youtube.com/watch?v=dw8pX6D5ky0
https://www.youtube.com/watch?v=0CAEoP-xg5U
https://www.youtube.com/watch?v=HOXpAtFe2mQ

Playlist:
https://www.youtube.com/playlist?list=PLyqRFFB9kitzKn_a_-PQa-DMO24SXNE-Z

The DEM and the visual maps I downlaoded from the former NASA-Site Map-A-Planet
(version 1).
The resolution isnt the best, due to the former download-limit of Map-A-Planet.
Also there is some flickering in the movies, partially by switched-off
anti-aliasing.

The elevation is exaggerated by a factor 1.5 to 2, I dont know the exact values.

But a nice try I think, I would love to get additional and more detailed maps to
play with.
Unfortunately NASA shuts down the old site and replaced it by a much more
complicated one.

By the way:
This is the sub-board to present movies, right? Or the other animation
sub-board?
Its my 2nd post here, thats why I ask.

Ciao,
Mätes


Post a reply to this message


Attachments:
Download '2020-11-16-201954_5120x1440_scrot.png' (961 KB)

Preview of image '2020-11-16-201954_5120x1440_scrot.png'
2020-11-16-201954_5120x1440_scrot.png


 

From: Jörg "Yadgar" Bleimann
Subject: Re: Planetary fly-overs with height-fields
Date: 18 Nov 2020 13:03:18
Message: <5fb51b96$1@news.povray.org>
Hi(gh)!

On 16.11.20 20:23, Mätes wrote:
 > Hi Povrayer,
 >
 > 2018 I worked with real height-data of planets and tried some 
fly-over with help
 > from Povrays height-fields.
 > Here one of the Moon (Mare Imbrium) and two from Mars (Vallis 
Marineris and
 > Olympus Mons).
 >
 > Videos:
 > https://www.youtube.com/watch?v=dw8pX6D5ky0
 > https://www.youtube.com/watch?v=0CAEoP-xg5U
 > https://www.youtube.com/watch?v=HOXpAtFe2mQ

Nicely done... what vertical resolution did you use - 8 or 16 bit? The 
Olympus Mons flyaround shows some "terraced" terrain usually seen with 
8-bit grayscale heightfields...
 > Playlist:
 > https://www.youtube.com/playlist?list=PLyqRFFB9kitzKn_a_-PQa-DMO24SXNE-Z
 >
 > The DEM and the visual maps I downlaoded from the former NASA-Site 
Map-A-Planet
 > (version 1).
 > The resolution isnt the best, due to the former download-limit of 
Map-A-Planet.
 > Also there is some flickering in the movies, partially by switched-off
 > anti-aliasing.

Meanwhile, there should be higher-quality data downloadable... if only 
NASA servers would not be so chaotically structured!

I myself plan to do planetary flyovers with spherical "heightfields", i. 
e. mesh2 reliefs wrapped around a sphere, like this:

https://www.youtube.com/watch?v=PKxHFAlz2Ns&pbjreload=101

Your nickname indicates that you're from Cologne - or at least the 
bordering Ripuarian-speaking regions... am I right?

See you in Khyberspace!

Yadgar


Post a reply to this message

From: Mätes
Subject: Re: Planetary fly-overs with height-fields
Date: 22 Nov 2020 11:05:00
Message: <web.5fba4546a2e69bcb44c862420@news.povray.org>
Hi Yadgar,

the original pictures are all 8-bit greyscale, and to convert them into 16-bit
didnt help. I want to ask a co-worker if there are some Gimp-Filters to better
them, maybe that helps. At them moment there are only 265 steps in height, hope
that I can smooth them a littlebit.

To get better pics I have to invest many hours of look and search in the
internet, there was no time for this in the past month.

Your movie looks nice, more detailed than mine.
I plan to check out meshes to but didnt start with it.
Do you have a skript as a starting-point for me?

Yes, I am from cologne, you're right.
I have a small personal blog but my website is down at the moment.
Will inform the povray-world when its online again :)

Alaaf,
Mätes


Post a reply to this message

From: Alain Martel
Subject: Re: Planetary fly-overs with height-fields
Date: 22 Nov 2020 16:44:05
Message: <5fba9555$1@news.povray.org>
Le 2020-11-22 à 06:02, M�tes a écrit :
> Hi Yadgar,
> 
> the original pictures are all 8-bit greyscale, and to convert them into 16-bit
> didnt help. I want to ask a co-worker if there are some Gimp-Filters to better
> them, maybe that helps. At them moment there are only 265 steps in height, hope
> that I can smooth them a littlebit.
> 

Converting an 8-bit image to 16-bits can't help. All it can do is append 
8 zeros as low order bits.
You need some more steps to interpolate smoothly between the original steps.


Post a reply to this message

Copyright 2003-2008 Persistence of Vision Raytracer Pty. Ltd.