POV-Ray : Newsgroups : povray.binaries.images : New Hampshire Heightfield WIP Server Time: 27 Jun 2019 04:17:22 GMT
  New Hampshire Heightfield WIP (Message 1 to 9 of 9)  
From: Bald Eagle
Subject: New Hampshire Heightfield WIP
Date: 21 May 2019 01:45:00
Message: <web.5ce356f7d68a971b4eec112d0@news.povray.org>
My little neck of the woods, hopefully soon to be the setting for the covered
bridge model.

re:
http://news.povray.org/povray.tools.general/thread/%3C5ce0fbbf%40news.povray.org%3E/

I laid out the images on flat unit squares vertically from the origin, then did
dual overlays onto "mild" heightfields - terrain or map over elevation grayscale
to the left of that.

To the right are textured heightfields over a red texture (I was looking for
holes)

And the rightmost are scaled to proper aspect.


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From: Bald Eagle
Subject: Re: New Hampshire Heightfield WIP
Date: 21 May 2019 01:50:02
Message: <web.5ce359326f1f4f074eec112d0@news.povray.org>
And here's the region - still slightly out of register.

I may have to rotate it around some other point than the image_map center.
It's close - only a 0.2 degree rotation so far, then a small translation.


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From: Thomas de Groot
Subject: Re: New Hampshire Heightfield WIP
Date: 21 May 2019 06:43:47
Message: <5ce39e23$1@news.povray.org>
On 21-5-2019 3:49, Bald Eagle wrote:
> And here's the region - still slightly out of register.
> 
> I may have to rotate it around some other point than the image_map center.
> It's close - only a 0.2 degree rotation so far, then a small translation.
> 

This looks promising indeed. Well done. The usual problems with bridges 
'melting' down into the river of course ;-)

In your other post in p.t.general, I referred to Sketchup because the 
site mentioned it, and so I assumed your use of it.

-- 
Thomas


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From: Mike Horvath
Subject: Re: New Hampshire Heightfield WIP
Date: 23 May 2019 06:44:58
Message: <5ce6416a$1@news.povray.org>
I've tried messing around with terrain generators in the past, and it's 
very hard to get satisfactory results. It takes real skill. I ended up 
giving up and throwing in the towel.

:(

Michael


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From: Jörg "Yadgar" Bleimann
Subject: Re: New Hampshire Heightfield WIP
Date: 3 Jun 2019 12:57:20
Message: <5cf51930$1@news.povray.org>
Hi(gh)!

On 21.05.19 03:49, Bald Eagle wrote:
> And here's the region - still slightly out of register.
> 
> I may have to rotate it around some other point than the image_map center.
> It's close - only a 0.2 degree rotation so far, then a small translation.

What elevation data did you use - SRTM (3 arcseconds) or ASTER (1 
arcsecond)? And what about building a mesh2 from these data rather than 
just a plain heightfield, as you could achieve a much higher vertical 
resolution?

See you in Khyberspace!

Yadgar

Now playing: Klanggarten 2 (Burkhard Schmiedl)


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From: Jörg "Yadgar" Bleimann
Subject: Re: New Hampshire Heightfield WIP
Date: 3 Jun 2019 13:02:45
Message: <5cf51a75$1@news.povray.org>
Hi(gh)!

On 21.05.19 08:43, Thomas de Groot wrote:

> This looks promising indeed. Well done. The usual problems with bridges 
> 'melting' down into the river of course ;-)

If I went for realism, I would use the Google Maps photo mosaic just as 
a model to build roads, bridges, trees, buildings etc. as real POV-Ray 
objects... and as it would be my neighbourhood too, I then would further 
refine these objects by taking ground-based pictures of streets and 
buildings... perhaps even with some photogrammetry gear!

See you in Khyberspace!

Yadgar

Now playing: Klanggarten 4 (Burkhard Schmiedl)


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From: Bald Eagle
Subject: Re: New Hampshire Heightfield WIP
Date: 3 Jun 2019 17:25:02
Message: <web.5cf557336f1f4f074eec112d0@news.povray.org>
Hey Yadgar,

I got my elevation data from here:

https://tangrams.github.io/heightmapper/#2/-0.2/0.4

SUPER convenient.

It definitely occurred to me that using the satellite photo as an
object-placement map would be the way to go.   I've never done a scene that way
yet, and I really don't have much experience getting any of the plant-generators
to work very well.

But it's on the list.

I've been eyeing up the photogrammetry stuff for a while now, and I think that
would a great POV-Ray module to develop - it would almost be "just" an extension
of the screen object placement macro.

If you have any links to photogrammetry tools, that would be fan-tastic.


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From: Jörg "Yadgar" Bleimann
Subject: Re: New Hampshire Heightfield WIP
Date: 3 Jun 2019 20:35:34
Message: <5cf58496$1@news.povray.org>
Hi(gh)!

On 03.06.19 19:21, Bald Eagle wrote:

> Hey Yadgar,
> 
> I got my elevation data from here:
> 
> https://tangrams.github.io/heightmapper/#2/-0.2/0.4

Looks not very convincing to me - it's only 8-bit, and it stretches the 
contrast according to the individual height range of the chosen section 
rather than using the global height range...

> If you have any links to photogrammetry tools, that would be fan-tastic.

What about this: https://www.meshlab.net/ - my loved one uses it for 3D 
experiments in Blender!

See you in Khyberspace!

Yadgar

Now playing: Credo (Pond)


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From: William F Pokorny
Subject: Re: New Hampshire Heightfield WIP
Date: 4 Jun 2019 11:29:08
Message: <5cf65604$1@news.povray.org>
On 6/3/19 1:21 PM, Bald Eagle wrote:
> 
> Hey Yadgar,
> 
> I got my elevation data from here:
> 
> https://tangrams.github.io/heightmapper/#2/-0.2/0.4
> 
> SUPER convenient.
...
> 

Cool & thanks for posting the link. I played & another reminder people 
are creating some interesting web sites on Github! I didn't try to 
output images. Saw Yadgar's comment about the 8 bit depth. Data volume / 
performance / display reasons I suppose.

The plane generated lidar data I found at Penn State years back was 
sitting at 19 bits. I remember hacking together code to translate to 
special 3 channel ppm files interpreted then by SDL functions as single 
grey scale values. I also installed and used GRASS for some conversions.

https://grass.osgeo.org/screenshots/lidar/

It does seem always to be a job to find what elevation data is available 
at any given time - then how to make use of it. Partly a problem of not 
doing it day to day I guess. Heck, my well aged brain struggles coming 
back to features of POV-Ray I've not recently used! :-)

Bill P.


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